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MasterTig 325DC
Operating Manual
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Kemppi MasterTig 335ACDC, MasterTig 325DC G, MasterTig 325DC, MasterTig 325DC GM, MasterTig 335ACDC GM Operating Manual

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Page 1
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
MasterTig 235ACDC, 325DC, 335ACDC
MasterTig Cooler M
© Kemppi
1/77 1920900 / 1939
Page 2
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
CONTENTS
1. MasterTig 4
2. Installation 8
3. Operation 25
3.2.1 Home 29
3.2.2 Start & stop sequence 30
3.2.3 Settings 32
3.3.1 Home view 36
3.3.2 Weld Assist view 37
3.3.3 Memory channels view 40
3.3.4 Start & stop sequence view 41
3.3.5 Current mode view 43
3.3.6 Pulse view 44
3.3.7 Settings view 46
3.3.8 Info view 49
3.3.9 Screen saver 50
4. Maintenance 54
5. Troubleshooting 56
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
6. Technical data 59
7. Ordering codes 76
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

1. MASTERTIG

These instructions describe the use of Kemppi's MasterTig 235ACDC, 325DC and 335ACDC welding power sources designed for demanding industrial use. The full system consists of MasterTig power source with either DC (MTP23X) or AC/DC (MTP33X, MTP35X) control panel, optional MasterTig Cooler M water cooler, optional transport unit and Flexlite TX TIG welding torch.
For the symbols used in this documentation, refer to "Symbols used" on page73.
Important notes
Read the instructions through carefully. For your own safety, and that of your working environment, pay particular attention to the safety instructions delivered with the equipment.
Items in the manual that require particular attention in order to minimize damage and harm are indicated with the below symbols. Read these sections carefully and follow their instructions.
Note: Gives the user a useful piece of information.
Caution: Describes a situation that may result in damage to the equipment or system.
Warning: Describes a potentially dangerous situation. If not avoided, it will result in personal damage or fatal injury.
DISCLAIMER
While every effort has been made to ensure that the information contained in this guide is accurate and complete, no liability can be accepted for any errors or omissions. Kemppi reserves the right to change the specification of the product described at any time without prior notice. Do not copy, record, reproduce or transmit the contents of this guide without prior permission from Kemppi.
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4/77 1920900 / 1939
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

1.1 Equipment description

Kemppi MasterTig 235 AC/DC, 325 DC and 335 AC/DC welding equipment is designed for professional industrial use, with characteristics especially suitable for welding materials like aluminum and stainless steel. The equipment con­sists of power source, control panel and cooling unit (optional). The MasterTig Cooler M cooling unit is used in liquid-cooled TIG welding with MasterTig power source. The multipurpose MasterTig power sources are suitable for MMA welding, TIG welding and pulsed TIG welding with both direct current (DC) and, depending on the model selected, alternating current (AC).
Available power source models:
• MasterTig 235ACDC GM, multi-voltage and generator compatible (230 A AC/DC) *
• MasterTig 325DC (300 A DC)
• MasterTig 325DC G, generator compatible (300 A DC) *
• MasterTig 325DC GM, multi-voltage and generator compatible (300 A DC)
• MasterTig 335ACDC (300 A AC/DC)
• MasterTig 335ACDC G, generator compatible (300 A AC/DC) *
• MasterTig 335ACDC GM, multi-voltage and generator compatible (300 A AC/DC)
* A dedicated VRD(Voltage Reduction Device)model version, where the VRD function is locked on, is also available.
Control panels:
• MTP23X control panel (DC, membrane panel)
• MTP33X control panel (AC/DC, membrane panel)
• MTP35X control panel (AC/DC, 7" TFT LCD display panel).
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Equipment:
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
1. MasterTig 235/325/335 power source
2. MasterTig Cooler M (optional)
3. TIG torch
4. Electrode holder
5. Earth return cable and clamp
6. Remote control (wired or wireless)
7. Foot pedal remote control (wired or wireless)
8. Power ON/OFFswitch.
Connections:
a. External remote control connector b. TIG welding cable connector c. Control cable connector d. DIX connector (-) e. DIX connector (+) f. Coolant liquid inlet and outlet (color-coded) g. Gas hose connection h. Mains cable i. Cooling unit connection j. Empty holder for unused DIX connector.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
EQUIPMENT IDENTIFICATION
Serial number
Serial number of the device is marked on the rating plate or in another distinctive location on the device. It is important to make correct reference to the serial number of the product when ordering spare parts or mak­ing repairs for example.
Quick Response (QR) code
The serial number and other device-related identification information may also be saved in the form of a QR code (or a barcode) on the device. Such code can be read by a smartphone camera or with a dedicated code reader device providing fast access to the device-specific information.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

2. INSTALLATION

Do not connect the equipment to the mains before the installation is complete.
Do not attempt to move or hang the equipment mechanically (e.g. with a hoist) from the handle on the power source unit. The handle is meant only for manual lifting.
Place the machine on a horizontal, stable and clean ground. Protect the machine from rain and direct sunshine. Check that there is enough space for cooling air circulation in the machine vicinity.
Before installation
• Make sure to acknowledge and follow the local and national requirements regarding installation and use of high voltage units.
• Check the contents of the packages and make sure the parts are not damaged.
• Before you install the power source on site, see the requirements for the mains cable type and fuse rating
given in the "Technical data" on page59 chapter.
Do not connect the machine to the mains before the installation is complete.
Only an authorized electrician is allowed to install the mains cable.
Distribution network
MasterTig 235ACDC: This equipment complies with IEC 61000-3-12 and can be connected to public low-voltage sys­tems.
MasterTig 325DC and 335ACDC: Provided that the public low voltage short circuit power at the point of common coupling is higher than or equal to the value stated on the list below, this equipment is compliant with IEC 61000-3­11 and IEC 61000-3-12 and can be connected to public low voltage systems. It is the responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network operator if necessary, that the system impedance complies with the impedance restrictions.
• MasterTig 325DC and 335ACDC: 1.7 MVA
• MasterTig 325DC G and 335ACDC G: 1.9 MVA
• MasterTig 325DC GM and 335ACDC GM: 1.4 MVA.
According to the EMC classification (Class A), the MasterTig 235, 325 and 335 equipment is not intended to be used in residential locations where the electrical power is provided by the public low-voltage supply system.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

2.1 Installing mains plug

Only an authorized electrician is allowed to install the mains cable and plug.
Do not connect the machine to the mains before the installation is complete.
Install the 3-phase plug according to the MasterTig power source and site requirements. In the 1-phase power source (MasterTig 235ACDC) the plug is pre-installed. Refer also to "Technical data" on page59 for power source spe­cific technical information.

2.2 Installing control panel

Tools:
• Screwdriver, Torx head (T20).
1. Connect the control panel’s cable and mount the control panel in place:
>> Insert the top of the panel in the slot first, and then lower the bottom of the panel down. >> Push the bottom of the panel firmly so that it locks in place.
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Operating manual - EN
2. Secure the control panel together with the hinged panel cover in place with the screw provided.
The hinged panel cover and the control panel are secured with the same screw.

2.3 Installing cooling unit

Only an authorized electrician is allowed to install the cooling unit.
Do not connect the equipment to the mains before the installation is complete.
Do not attempt to move the power source with a hoist from its handle. The handle is meant for manual lifting only.
When a transport cart is used, refer also to the "Mounting units on cart (optional)" on page13 chapter.
Tools:
• Screwdriver, Torx head (T20).
1. Remove the power source's rear cover.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
2. Move the power source on top of the cooling unit so that the bar in the rear goes into the rear connection
interface and lower the front onto the front connection interface. Secure the power source from the front with the screws provided.
Ensure that the cooling unit’s connection cables don't get caught between the units and get damaged in the process.
3. Connect the cooling unit cables and put the rear cover back.
4. Fill the cooling unit with cooling liquid.
>> MasterTig Cooler M tank volume is 3 litres and the recommended coolant is MPG 4456 (Kemppi mixture).
Avoid cooling liquid contact with skin or eyes. In case of an injury, seek for medical advice.
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MasterTig 235ACDC, 325DC, 335ACDC

2.4 Installing particle filter (optional)

The optional particle filter is installed together with an additional filter frame as a pack.
1. Place the filter into the filter frame
2. Install the filter pack in front of the air inlet on the rear of the power source.
Operating manual - EN
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12/77 1920900 / 1939
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

2.5 Mounting units on cart (optional)

There are three different transport unit options available for use with MasterTig welding equipment:undercarriage P43MT, 4 wheel cart P45MT and 2 wheel cart T25MT.
Tools:
• Allen key set.
1. Assemble the transport unit according to the instructions delivered with it. With the T25MT cart, the welding
equipment securing bracket (*) is attached once the welding equipment is installed on the cart.
Transport units from left to right:P45MT, T25MT, P43MT.
2. Move the unit on top of the cart so that the bar in the rear goes into the rear connection interface and lower
the front onto the front connection interface. Secure the power source from the front with the screws (2 x M5x12) provided.
Do not attempt to move the power source with a hoist from its handle. The handle is meant for manual lifting only.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
With the 2 wheel cart (T25MT), an additional securing bracket is attached to the power source handle. Secure the bracket to the cart with the screws provided (M8x16) .
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Operating manual - EN

2.6 Connecting TIG torch

Gas-cooled TIG torch:
1. Assemble the TIG torch according to the instructions delivered with the torch.
2. Connect the TIG torch cables to the power source. Secure by turning the connectors clockwise.
Water-cooled TIG torch:
The cooling unit must already be installed and in place at this stage. Refer to "Installing cooling unit" on page10.
1. Assemble the TIG torch according to the instructions delivered with the torch.
2. Connect TIG torch cables and the water cooling inlet and outlet hoses to the units. Secure by turning the con-
nectors clockwise.
The water cooling connectors are color-coded.
Tip: For Kemppi welding torches, refer also to userdoc.kemppi.com.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

2.7 Connecting earth return cable and clamp

Keep the work piece connected to earth to reduce the risk of injury to users or damage to electrical equipment.
With the MasterTig 235ACDC and 335ACDC power sources, always connect the earth return cable to the negative (-) connector.
1. Connect the earth return cable to the power source.
2. Ensure the earth return clamp is secured tightly to the work piece or work surface.
3. Ensure that the clamp's contact surface is as large as possible.
DC = MasterTig 325DC
ACDC = MasterTig 235ACDC and 335ACDC.
With the DC power source, in MMA welding only, the earth return cable can also be connected to the negative (-) con­nector, depending on the application.
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MasterTig 235ACDC, 325DC, 335ACDC

2.8 Connecting MMA electrode holder

1. Connect the MMA electrode holder to the (+) connector on the power source.
2. Connect the earth return cable to the (-) connector on the power source.
3. Ensure the earth return clamp is secured tightly to the work piece or work surface.
4. Ensure that the clamp's contact surface is as large as possible.
Operating manual - EN
With the DC power source, in MMA welding only, the cables can also be connected the other way round, depending on the welding polarity.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

2.9 Installing remote control

Remote controls are optional. To enable remote operation, set the Remote control mode in the control panel set- tings. For MTP23X and MTP33X control panels, refer to MTP23X/33X "Settings" on page32 and for MTP35X control panel, refer to MTP35X "Settings view" on page46.
When the Remote mode is selected on the control panel, and both, wireless and wired, remotes are connected, the wired remote will be used.
Refer to the (+) and (-) signs on the battery holder and in the remote for the correct positioning of batteries.
Tools:
• Screwdriver, Torx head (T15).
Wireless hand remote control (HR45)
1. Take the remote control battery holder out. Install the batteries (3 x AAA) and put the holder back into the
remote.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
2. Turn on the Wireless remote in the control panel settings. For MTP23X and MTP33X control panels, refer to
MTP23X/33X "Settings" on page32 and for MTP35X control panel, refer to MTP35X "Settings view" on page46.
3. Keeping the wireless remote close to the power source, long press (3 sec.) the wireless remote pairing button
on the remote.
4. Once connected, the blue LED on the left of the connection button is lit. The green LED blinks when the battery
is low.
5. To enable remote operation, select Remote mode in the control panel settings.
Remote control with cable (HR43, FR43)
1. Connect the remote control cable to the power source.
Wireless foot pedal (FR45)
Refer to the (+) and (-) signs on the battery holder and in the remote for the correct positioning of batteries.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
1. Take the foot pedal battery holder out. Install the batteries (3 x AAA) and put the holder back into the foot
pedal.
2. Turn on the Wireless remote in the control panel settings. For MTP23X and MTP33X control panels, refer to
MTP23X/33X "Settings" on page32 and for MTP35X control panel, refer to MTP35X "Settings view" on page46.
3. Keeping the wireless remote close to the power source, long press (3 sec.)the wireless remote pairing button
on the foot pedal.
4. Once connected, the blue LED next to the button is lit. The green LED blinks when the battery is low.
Tip: You can set minimum and maximum values for the remote current adjustment in the control panel set-
tings.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

2.10 Installing gas bottle

Handle gas bottles with care. There is a risk of injury if the gas bottle or the bottle valve is damaged!
If a transport unit with a gas bottle rack is used, install the gas bottle on the transport unit first, then make the con­nections.
Use inert gas, such as argon, helium or argon-helium mixture, as a shielding gas in TIG welding. Make sure that the gas flow regulator is suitable for the gas type used. The flow rate is set according to the welding current, joint form and the size of the electrode.
A suitable flow rate for argon is normally 5 – 15 l/min. If the gas flow is not correctly set, this will increase the risk of defects in the weld (weld porosity). Spark ignition becomes more difficult if the gas flow is too high.
Contact your local Kemppi dealer for choosing the gas and the equipment.
a. Gas bottle valve b. Flow regulation screw c. Connecting nut d. Hose connector e. Gas bottle contents indicator f. Gas flow meter
Always secure the gas bottle properly in an upright position to a special holder on the wall or on the welding equip­ment cart. Always keep the gas bottle valve closed when not welding. If the machine will be out of use for a long time, unscrew the pressure regulation screw.
Do not use the whole contents of the bottle.
Use a suitable shielding gas for the welding application.
Always use an approved and tested regulator and flow meter.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

2.11 Installing gas bottle on cart

1. P45MT only: Tilt the pivoting gas bottle rack down against the floor for easier gas bottle mounting.
2. Move the gas bottle onto the rack.
>> With P45MT, tilt the gas bottle back and pull the cart towards the gas bottle and push the top of the gas
bottle forwards. The pivot plate assists to lift the bottle into upright position.
3. Secure the gas bottle in place with a strap or a chain. Use the dedicated fixing points in the cart.
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Operating manual - EN

2.12 Moving equipment by lifting

If you need to lift MasterTig welding equipment, pay special attention to the safety measures. Also follow the local regulations. MasterTig welding equipment can be lifted with a mechanical hoist when the equipment is installed securely on the cart.
If a gas bottle is installed on cart, DO NOT attempt to lift the cart with the gas bottle in place.
DO NOT attempt to lift the equipment with a hoist from the handle.
4 wheel cart (P45MT):
1. Ensure that the welding equipment is properly secured to the cart.
2. Connect the 4-legged chain or straps from the hoist hook to the four lifting points on the cart on both sides of
the welding equipment.
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2 wheel cart (T25MT):
1. Ensure that the welding equipment is properly secured to the cart.
2. Connect the hoist hook to the lifting handle on the cart.
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

3. OPERATION

Before using the equipment, ensure that all the necessary installation actions have been completed according to your equipment setup.
Welding is forbidden in places where there is an immediate fire or explosion hazard!
Welding fumes may cause injury, take care of sufficient ventilation during welding!
Check that there is enough space for cooling air circulation in the machine vicinity.
If the welding equipment is left unused for a longer period, disconnect the mains plug from the mains.
Do not use the mains plug as a power ON/OFF switch.
Always check before use that interconnecting cable, shielding gas hose, earth return cable/clamp and mains cable are in serviceable condition. Ensure that the connectors are correctly fastened. Loose connectors can impair welding per­formance and damage connectors.
For technical data and general guidance for selecting initial TIG welding parameters, refer to "TIG guide tables" on page66.
For troubleshooting, refer to "Troubleshooting" on page56.
Tip: There is a small locker inside the power source handle, under the lid, that can be used for storing small consumables. The device QR code can also be found here.
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

3.1 Operating power source

1. Turn the power source ON. The power switch is located in the rear.
2. Depending on your control panel type, wait approximately 15 seconds for the system to start up.
For control panel operation, refer to:
• "Operating control panels MTP23X and MTP33X" on page27
• "Operating control panel MTP35X" on page35
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

3.2 Operating control panels MTP23X and MTP33X

MTP23X and MTP33X control panels include physical push buttons for the most common setup and adjustment fea­tures as well as a small digital display for showing the adjustment values and more in-depth settings.
MTP23X control panel has only the DCcurrent mode available, whereas MTP33X control panel includes both, AC and DC current modes.
Controls:
The MTP23X and MTP33X control panels are used with a control knob and with two function buttons in the bottom section of the front cover as well as with dedicated push buttons on the panel itself. The control knob can be turned and used also as a push button according to the current selections. Settings and adjustment values are shown on the digital display embedded in the control panel.
Control panel MTP33X on the left and control panel MTP23X on the right:
1. Control knob
• In home mode this adjusts the welding current (A)
• Used to navigate within the control panel's embedded display and settings
• When the green light is lit in the knob center, the knob also functions as a push button for selection
2. Welding process selection button (left function button)
• Switches between welding processes: TIG / MMA
3. Welding mode selection button (right function button)
• Switches between welding modes: Continuous / Spot / MicroTack
4. MTP33X control panel only: Current mode selection button
• Short press switches between current modes: AC / DC- / Mixed current (AC/DC-)
• Long press switches to DC+ mode
5. Ignition mode selection button
• Switches between different ignition modes: Lift TIG / High frequency (HF) ignition
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
6. Trigger logic selection button
• Switches between the trigger logics: 2T / 4T
7. Pulse mode selection button
• Selects the pulse mode or turns the pulse off: Auto / Manual / Pulse off
8. Gas test button
• Flushes the gas line without ignition and welding
• Pressing the Gas test button starts the gas test with default time. Gas test time can be adjusted by turning the
control knob (1) during the gas test:0 s ... 60 s, step 1 s (Default: 20 s)
• Gas test can be stopped by pressing the button again.
9. Start & stop sequence button
• Toggles between Start & stop sequence settings: Pregas / Upslope / Hot start level / Hot start time / Minilog (4T
only) / Downslope / Postgas
• If AC mode is on, AC frequency and AC balance settings can be accessed
• If Pulse mode is on, Pulse current, Pulse ratio, Base current and Pulse frequency settings can be accessed
>> In the Pulse Auto mode, these settings can be viewed only.
10. Settings button
• Opens the settings menu
• Advanced settings can be accessed with a long press of the button.
Settings menu content depends on the currently selected welding process and mode.
11. Home button
• Returns you to the initial work mode where the welding current (A) can be adjusted
Lights and symbols:
a. Cooling unit
• Green: Cooling unit is connected and running
• Red: Cooling unit is connected, but there is a problem (e.g. with coolant circulation)
b. Operating temperature
• Yellow: Welding equipment has overheated
c. General notification
• Yellow: There is an error that requires attention
• Red: There is a fault that prevents welding
• The error code is shown on the display. If the error does not prevent welding, this error code can be dismissed,
but the notification light stays lit.
d. VRD (voltage reduction device)
• Green:VRD is on
• Red (blinking):There is a fault with VRD that prevents welding
• Not lit:VRD is off
e. Wireless device
• Blue:Wireless device is connected
• Blue, blinking:Pairing in progress.
In error situations, an error code is displayed. Refer to "Troubleshooting" on page56 section in this manual for more information on the error in question.
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Operating manual - EN
For welding process and control panel feature descriptions, refer to "Welding processes and features" on page67.
Control panel parameter adjustment:
• "Home" below
• "Start & stop sequence" on page30
• "Settings" on page32 .

3.2.1 Home

'Home' is the control panel work mode after the initial machine and control panel start-up. When Home is selected, the welding current can be adjusted by turning the control knob.
To adjust welding current:
1. Press the Home button (11).
2. Turn the control knob (1)to adjust the current. Current (A) is shown on the display.
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Operating manual - EN

3.2.2 Start & stop sequence

The parameters diagram tool makes base parameter identification and setting easy. From pre-gas time to post-gas time and everything in between, you can quickly select and adjust the parameter value.
The AC/DC function (4) is not available with the MTP23X control panel.
To select and adjust Start & stop parameters:
1. Press the Start & stop button (9) to enter the parameter settings.
2. Browse through the curve / menu parameters by turning the control knob (1).
3. Select the parameter for adjusting by pressing the control knob button (1).
4. Adjust the selected parameter by turning the control knob (1).
5. Close the parameter setting by pressing the control knob again (1).
To select and adjust AC and/or Pulse parameters:
1. Press the Current mode selection button (4) to switch to AC mode.
2. Press the Pulse mode selection button (7) to switch between Pulse modes.
3. Press the Start & stop button (9) to enter the parameter settings.
4. Browse to the AC or Pulse settings in the parameter menu by turning the control knob (1).
5. Select the AC or Pulse parameter for adjustment by pressing the control knob button (1).
6. Adjust the selected parameter's value by turning the control knob (1).
7. Close the parameter setting by pressing the control knob button (1).
The Current mode and Pulse mode selections have an effect on the Start & stop menu contents.
Adjustable parameters in continuous welding:
Pre gas: Min/Max = 0.0 s ... 9.9 s, Auto, 0.1 s step (Default = Auto)
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MasterTig 235ACDC, 325DC, 335ACDC
>> This adjustment is not available when the Lift TIG ignition is turned on.
Upslope: Min/Max = 0.0 s ... 5.0 s, 0.1 s step (Default = 0.0 s)
Hot start level: Min/Max = -80% ... +100%, 1% step (Default = Off), Value '0' = Hot start off
Hot start time: Min/Max = 0.1 s ... 9.9 s, 0.1 s step (Default = 1.2 s)
>> This adjustment is not available when Hot start is off. >> Hot start time cannot be adjusted when 4T trigger logic is selected.
Minilog: Min/Max = -99% ... +125%, 1% step (Default = Off), Value '0' = Minilog off
>> This adjustment is not available when the 2T trigger logic is selected.
Downslope: Min/Max = 0.0 s ... 15.0 s, 0.1 s step (Default = 0.1 s)
Post gas: Min/Max = 0.0 s ... 30.0 s, Auto, 0.1 s step (Default = Auto)
Adjustable parameters in spot welding:
Pre gas: Min/Max = 0.0 s ... 9.9 s, Auto, 0.1 s step (Default = Auto)
>> This adjustment is not available when the Lift TIG ignition is turned on.
Upslope: Min/Max = 0.0 s ... 5.0 s, 0.1 s step (Default = 0.0 s)
Operating manual - EN
Downslope: Min/Max = 0.0 s ... 15.0 s, 0.1 s step (Default = 0.1 s)
Post gas: Min/Max = 0.0 s ... 30.0 s, Auto, 0.1 s step (Default = Auto)
Adjustable parameters in MicroTack welding:
Pre gas: Min/Max = 0.0 s ... 9.9 s, Auto, 0.1 s step (Default = Auto)
>> This adjustment is not available when the Lift TIG ignition is turned on.
Post gas: Min/Max = 0.0 s ... 30.0 s, Auto, 0.1 s step (Default = Auto)
Adjustable parameters in AC mode:
Balance: -60 % ... 0 % (Default = -25%)
AC Frequency: 30 Hz ... 250 Hz (Default = 60 Hz)
Adjustable parameters in Pulse mode:
Pulse current: 2 A ... Power source max A, 1 A step *
Pulse ratio: 10 % ... 70 %, 1 % step (Default = 40 %) *
Base current: 10 % ... 70 %, 1 % step (Default = 20 %), amperes visible *
Pulse frequency (DC): 0.2 Hz ... 300 Hz, 1 Hz step (0.2 Hz ... 10 Hz step is 0.1 Hz) (Default = 1 Hz) *
Pulse frequency (AC): 0.2 Hz ... 20 Hz, 1 Hz step (0.2 Hz ... 10 Hz step is 0.1 Hz) (Default = 1 Hz) *
* Auto Pulse mode has different parameter values and they cannot be adjusted.
"Welding processes and features" on page67
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MasterTig 235ACDC, 325DC, 335ACDC

3.2.3 Settings

The contents of the Settings menu depend on the welding process, current mode and welding mode selected.
Operating manual - EN
To select and adjust parameters in Settings menu:
1. Press the parameter settings button (10) to enter the menu.
2. Browse through the menu parameters by turning the control knob (1).
3. Select a parameter for adjustment by pressing the control knob button (1).
4. Adjust the selected parameter by turning the control knob (1).
5. Close the parameter setting by pressing the control knob button (1).
To enter advanced Settings menu:
Press the Settings button (10) for 5 seconds.
Rarely used settings items are hidden by default. Those are available in the advanced settings menu.
Settings:
Latest weld: Current, voltage, arc time
>> This settings item shows last weld data values.
AC Waveform: Sine / Optima / Square (Default: Optima)
Spot time: 0.1 s ... 150.0 s, step 0.1 / 1.0 s (Default = 2.0 s)
MIX TIG AC ratio: 10 % ... 90 %, step 1 % (Default = 50 %)
MIX TIG cycle time: 0.1 s ... 1.0 s, step 0.1 s (Default = 0.6 s)
MIX TIG DC level: 50 % ... 150 %, step 1 % (Default = 100 %)
MicroTack spot time: 1 ms ... 200 ms, step 1 ms (Default = 10 ms)
MicroTack pause time: 50 ms ... 500 ms, step 1 ms (Default = 50 ms)
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MicroTack spot count: 1 ... 5, Endless (Default = 1)
Arc force: -10 ... +10 , step 1 (Default = 0)
Hot start: -10 ... +10 , step 1 (Default = 0)
VRD: OFF / ON (Default = OFF)
>> In AU VRD version: Default ON, OFF disabled. >> VRD (Voltage Reduction Device).
MMA Antifreeze: OFF / ON (Default = ON)
HF spark force: 50 % ... 110 %, Step 1 % (Default 100 %)
TIG antifreeze: OFF / ON (Default = OFF)
Remote mode: OFF / Remote / Torch (Default = OFF)
Remote control min: Min = “Current limit min”, Max = “Current limit max”
Remote control max: Min = “Current limit min”, Max = “Current limit max”
Wireless remote: Cancel / Start (Start pairing)
Water cooler: OFF / Auto / ON (Default: Auto)
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
Weld data time: OFF / 1 s ... 10 s, step 1 s (Default = 5 s)
Display off: 5 min ... 120 min, step 1 min (Default = 5 min)
Date: Date setting (DD/MM/YYYY)
>> Set the day by pressing and turning the control knob. Once the day is set, press the control knob button to
set the month etc.
Time: Time setting (HH:MM)
>> Set the hour by pressing and turning the control knob (use 24 h format). Once the hour is set, press the con-
trol knob button to set the minutes.
Language: Select language from the list
Time counter: Total arc time and power on time
Time counter (since date): Total arc time and power on time since last reset
Reset counter: Time counter reset
4T trigger logic:4T MLOG / 4T LOG / 4T LOG+ (Default = 4T MLOG)
Advanced settings (hidden in standard view):
Current limit min: TIG: 2 A / MMA: 8 A, step 1 A *
Current limit max: TIG: power source's nominal value / MMA: power source's max. MMA current, step 1 A *
Balance min: -99 % ... 0 % (Default = -60 %)
Balance max: 0 % ... 20 % (Default = 0 %)
Lift TIG current:5 A ... 40 A / Auto (Default = Auto)
Cooler flow watch: OFF / ON (Default = ON)
Positive ignition current: 30 % ... 150 % / Auto, step 1 % (Default = Auto)
Negative ignition current (AC/DC): 100 % ... 300 % / Auto, Step 1 % (Default = Auto)
Ignition current (DC): 100 % ... 300 % / Auto, step 1 % (Default = Auto)
Positive ignition time: 0 ms ... 50 ms / Auto, step 10 ms (Default = Auto)
Negative ignition time (AC/DC): 0 ms ... 950 ms / Auto, step 10 ms (Default = Auto)
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Ignition time (DC): 0 ms ... 950 ms / Auto, step 10 ms (Default = Auto)
Slight upslope: OFF / ON (Default = OFF)
Startup level:5 % ... 40 %, step 1 % (Default = 10 %)
Downslope cut level: 5 % ... 40 %, step 1 % (Default = 10 %)
2T downslope cut: OFF / ON (Default = OFF)
Nonlinear downslope: 0 % ... 50 %, step 1 % (Default = 0 %)
Current freezing: OFF / ON (Default = OFF)
AC phase swap current: 5 A ... 20 A / Auto
Info:Machine type, serial number
Software version:Power source and control panel software version number
Factory reset: Cancel / Reset (Default = Cancel)
>> Resets to TIG, DC-, 50 A, HF, Pulse OFF (other values as per default). >> Once the factory reset is complete, the power source must be restarted manually.
* Current range adjustable by welder in TIG welding:
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
• 2 A ... 130 A, 1 A step (MasterTig 235, limited supply mode)
• 2 A ... 235 A, 1 A step (MasterTig 235)
• 2 A ... 305 A, 1 A step (MasterTig 325, 335)
• Default = 3 A ... Nominal value of the power source.
* Current range adjustable by welder in MMA welding:
• 8 A ... 85 A, 1 A step (MasterTig 235, limited supply mode)
• 8 A ... 185 A, 1 A step (MasterTig 235)
• 8 A ... 255 A, 1 A step (MasterTig 325, 335)
• Default = 10 A ... MMA maximum current of the power source.
"Welding processes and features" on page67
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MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

3.3 Operating control panel MTP35X

Control panel MTP35X has a 7” TFT LCD display. In addition to MTP23X and MTP33X control panels' features, the MTP35X control panel includes memory channels, Weld Assist, option for more customized welding processes, assist­ing graphics and functions such as double pulse TIG, search arc and tail arc.
Controls:
The control knob can be turned and used as a push button to select functions and items on the screen. In addition to the control knob, there are two function buttons just below the panel display on both sides of the control knob.
1. Control knob and control knob button
• In home view, turning this knob adjusts the welding current (A)
• In other views, turning this knob switches between adjustable parameters and adjusts the selected parameter's
value
• The control knob functions also as a push button, when the green light is lit in the knob center
• Used to navigate through the control panel views and selections.
2. Menu button (left function button)
• This is used to access the view menu
• With certain control panel settings and features this also acts as a ‘back’ or ‘cancel’ button.
3. Custom function button (right function button)
• This button can be used as a user-programmable shortcut
• With certain control panel settings and features this also acts as a ‘back’ or ‘cancel’ button.
The MTP35X control panel displays notifications, warnings and error messages with additional information directly on the screen. Refer also to "Troubleshooting" on page56 section in this manual for more information on solving error situations.
For welding process and control panel feature descriptions, refer to "Welding processes and features" on page67.
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Operating manual - EN
Control panel views:
• "Home view" below
• "Weld Assist view" on the next page
• "Memory channels view" on page40
• "Start & stop sequence view" on page41
• "Pulse view" on page44
• "Current mode view" on page43
• "Settings view" on page46
• "Info view" on page49
To navigate between different control panel views:
1. Press the menu button (2).
2. Browse to the target view by turning the control knob (1).
3. Select the view by pressing the knob (1).
Tip: You can switch between the home view and the previously used view by long pressing the menu but-
ton (2).

3.3.1 Home view

Home view is the control panel work mode after the initial machine and control panel start-up. When in Home view, the welding current can be adjusted directly by turning the control knob.
Depending on your welding settings, the following are shown:
• Welding current(A)
• Current mode (AC, DC-, DC+, MIX)
• Pulse mode: Auto / Selected value Hz (manual)
• Start & stop diagram
• Welding mode indicated by the diagram shape:Continuous, Spot or MicroTack
• Memory channel used
• Selected trigger logic, ignition mode, remote mode and welding process
• Warning and notification symbols.
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1. Welding process (TIG/MMA)
2. Trigger logic (2T/4T)
3. Iginition mode (Lift TIG ignition / HF ignition)
4. Wireless remote and its battery status
5. Remote mode (ON/OFF).
Warning and notification symbols:
a. Cooling unit
• Green: Cooling unit is connected and running
• Red: Cooling unit is connected, but there is a problem (e.g. coolant circulation is restricted)
b. General notification
• Yellow: This is a warning that requires attention
• Red: There is an error that prevents welding
• Error code is shown below the symbol
c. Operating temperature
• Red: Welding equipment has overheated
d. Low-voltage network (MasterTig 235 only)
Operating manual - EN
• Yellow:Power source is connected to a low-voltage network (110 V) and the maximum welding current is restric­ted to 130 A in TIG welding and to 85 A in MMA welding.
The power source checks the network voltage only when powering up. In case the network voltage changes, the power source must be turned off and on again.
e. VRD (voltage reduction device)
• VRD symbol on:VRD is on
>> This is always on in power source models where the VRD function is locked on.
• VRD symbol red (blinking):There is a fault with VRD that prevents welding
• VRD symbol off:VRD is off.
Tip: You can switch between the home view and the previously used view by long pressing the menu but-
ton.

3.3.2 Weld Assist view

Weld Assist is a wizard-like utility for easy selection of welding parameters. The utility walks the user step-by-step through the selection of required parameters, presenting the selections in an easily understandable way for a non­technical user. This is available in the MTP35X control panel.
Weld Assist feature is available with TIG welding only. In Weld Assist, the selections are made with the control knob (1) and with the two function buttons (2, 3):
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Operating manual - EN
Using Weld Assist:
1. Go to the Weld Assist view and select 'Start' with the control knob button (1).
2. Select:
>> The material you are about to weld: Fe (mild steel) / Ss (stainless steel) / Al (aluminum). >> The welded material’s thickness (0.5 ... 10 mm). >> The welding joint type: butt joint / corner joint / edge joint / lap joint / fillet joint / tube joint / tube+plate
joint.
>> The welding position: PA / PB / PC / PD / PE / PF / PG.
With MasterTig DC power sources, the aluminum (Al) selection is not available as a welded material.
3. Confirm the Weld Assist’s recommendation for welding settings by selecting 'Apply'.
Tip: You can go back step by step in Weld Assist by pressing the left function button (2). Selecting Cancel
with the right function button (3), you can cancel Weld Assist recommendations and return to the beginning.
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Weld Assist automatically sets the following parameters for you:
• Current mode: AC / DC-
• Current: 3...300A or 3...230A depending on the machine used
• Pulse (if used): Frequency
• AC and Start & stop parameters: Set to default.
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
All these parameters can still be modified as per normal for the actual welding.
Weld Assist gives you a recommendation for these:
• Shielding gas flow: "Argon" + l/min and "Helium" + l/min
• Electrode: Diameter
• Filler (if used): Material and diameter
• Number of passes: Number and/or visualization
• Travel speed: mm/min.
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Operating manual - EN

3.3.3 Memory channels view

Memory channel is a place to store predefined welding parameter settings for future use. A welding machine can include a number of preset and user-defined channels.
To browse through channels and select channels:
1. Go to the Channels view.
2. Turn the control knob (1) to switch between channels.
3. The highlighted channel is automatically selected.
To save or delete channels:
1. Turn the control knob (1) to highlight a channel.
2. Open the channel actions menu by pressing the control knob button (1).
3. The available actions are shown:Cancel, Save changes, Save to and Delete.
4. Select the action with the control knob (1).
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Operating manual - EN

3.3.4 Start & stop sequence view

The parameters diagram view makes base parameter identification and setting easy. From pre-gas time to post-gas time and everything in between, you can quickly select and adjust the needed parameter value.
To adjust parameters:
1. Go to the Start & stop sequence view.
2. Turn the control knob (1) to browse through the parameters.
3. Select a parameter for adjusting by pressing the control knob button (1).
4. Adjust the parameter by turning the control knob (1).
5. Close the parameter setting by pressing the control knob (1).
Adjustable parameters in all welding modes:
Trigger logic: 2T / 4T / 4T LOG / 4T LOG + Minilog (Default = 2T)
Welding mode:Continuous / Spot / MicroTack
Welding current:Default = 50 A.
Ignition mode:Lift TIG / High frequency (HF) ignition
Adjustable parameters in continuous welding:
Pre gas: 0.0 s ... 10.0 s, Auto, 0.1 s step (Default = Auto)
Search arc: OFF / 5 % ... 90 %, step 1 % (Default = OFF)
Upslope: OFF / 0.1 s ... 5.0 s, 0.1 s step (Default = 0.0 s)
Hot start level: -80 % ... 100 %, 1 % step (Default = OFF, 0 %)
Hot start time: 0.1 s ... 5.0 s, 0.1 s step (Default = 1.2 s)
>> This is not available with 4T trigger logic.
Minilog level: -99 % ... 125 %, 1 % step (Default = OFF, 0 %)
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Downslope: OFF / 0.1 s ... 15.0 s (Default = 0.1 s)
Tail arc: OFF / 5 % ... 90 % (Default = OFF)
Post gas: 0.1 s ... 30.0 s / AUTO, 0.1 s step.
Adjustable parameters in spot welding:
Pre gas: 0.0 s ... 10.0 s, Auto, 0.1 s step (Default = Auto)
Upslope: OFF / 0.1 s ... 5.0 s, 0.1 s step (Default = 0.0 s)
Spot time: 0.0 s … 10.0 s, step 0.1 s (Default = 2.0 s)
Downslope: OFF / 0.1 s ... 15.0 s (Default = 0.1 s)
Post gas: 0.1 s ... 30.0 s / AUTO, 0.1 s step (Default = Auto).
Adjustable parameters in MicroTack welding:
Pre gas: 0.0 s ... 10.0 s, Auto, 0.1 s step (Default = Auto)
MicroTack spot time: 1 ms ... 200 ms, step 1 ms (Default =10 ms)
MicroTack pause time: 50 ms ... 500 ms, step 1 ms (Default = 50 ms)
>> This is not visible in the settings if the MicroTack pulse count is only 1.
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
MicroTack spot count: 1 ... 5 / endless, step 1 (Default = 1)
>> If Lift TIG is used, MicroTack graph shows only 1 spot and the spot count parameter is not visible.
Post gas: 0.1 s ... 30.0 s / AUTO, 0.1 s step (Default = Auto).
"Welding processes and features" on page67
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3.3.5 Current mode view

MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
To adjust parameters:
1. Go to the Current mode view.
2. Turn the control knob (1) to browse through the parameters.
3. Select a parameter to be adjusted by pressing the control knob (1).
4. Adjust the parameter by turning the control knob (1).
5. Close the parameter setting by pressing the control knob (1).
Adjustable parameters:
Current mode:DC- / DC+ / AC / MIX
AC Waveform: Sine / Optima / Square (Default: Optima)
AC Frequency: 30 Hz ... 250 Hz (Default = 60 Hz)
AC+ / AC- balance: Min/Max = -60 % ... 0 % (Default = -25%)
MIX TIG AC (time) ratio: Min/Max = 10 % ... 90 %, step 1 % (Default = 50 %)
MIX TIG cycle time: Min/Max = 0.1 s ... 1.0 s, step 0.1 s (Default = 0.6 s)
MIX TIG DC level: Min/Max = 50 % ... 150 %, step 1 % (Default = 100 %).
"Welding processes and features" on page67
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3.3.6 Pulse view

MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
To adjust parameters:
1. Go to the Pulse view.
2. Turn the control knob (1) to browse through the parameters.
3. Select a parameter for adjustment by pressing the control knob button (1).
4. Adjust the parameter by turning the control knob (1).
5. Close the parameter setting by pressing the control knob button (1).
Adjustable parameters:
Pulse mode: OFF / Auto / Manual / Double
>> When OFF is selected, pulse settings are not visible. When Auto is selected, pulse settings are visible but not
adjustable. When Manual is selected, pulse settings are visible and adjustable.
Average current: Min =Current limit min, Max = Machine-specific
>> These values depend also on other pulse parameters. Maximum average current is also limited by the
machine specifications.
Pulse frequency: 0.2 Hz ... 300 Hz, 1 Hz step (Default = 1.0 Hz)
>> When ACcurrent mode is used, the maximum Pulse frequency is 20 Hz.
Pulse ratio: 10 % ... 70 %, 1 % step (Default = 40 %)
Pulse base current: 10 % ... 70 %, 1 % step (Default = 20 %)
Pulse current:10 A ... 300 A, 1 A step
>> These values depend also on other pulse parameters. Maximum pulse current is also limited by the
machine specifications.
Adjusting one Pulse parameter value has an effect on the other values as well.
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"Welding processes and features" on page67
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
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3.3.7 Settings view

MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
To adjust settings:
1. Go to the Settings view.
2. Turn the control knob (1) to browse through the settings groups and parameters.
3. Select a parameter to be adjusted or changed by pressing the control knob button (1).
4. Adjust or change the setting by turning the control knob (1).
5. Close the parameter setting by pressing the control knob button (1).
Some of the settings are e.g. current mode and welding process specific and are visible or not visible in the settings menu accordingly.
Common welding settings:
Welding process: TIG / MMA (Default = TIG)
>> Selecting a welding process changes automatically to the last active channel for the selected process. >> For safety reason, the device always starts up in TIG.
Current limit min: TIG: 2 A / MMA: 8 A, step 1 A *
Current limit max: TIG: power source's nominal value / MMA: power source's max. MMA current, step 1 A *
Remote control mode: OFF/ Remote / Torch (Default = OFF)
>> When a remote control or a torch remote control is selected, the welding current adjustment on the control
panel is disabled.
Remote control min: Min = “Current limit min”, Max = “Current limit max”
Remote control max: Min = “Current limit min”, Max = “Current limit max”
Button remote channel control: OFF / ON (Default = OFF)
Wireless remote:Pairing starts automatically when selected
>> New pairing information replaces the old information.
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>> Pairing status is shown as the settings value.
TIG settings:
Balance limit min: -99 ... 0, step 1 (Default =-60)
Balance limit max: 0 ... +20. step 1 (Default = 0)
Lift TIG current: 5 A ... 40 A / Auto, step 1 A (Default = Auto = 10 A)
HF spark force: 50 % ... 110 %, step 1 % (Default = 100 %)
Positive ignition current: 30 % ... 150 % / Auto, step 1 % (Default = Auto)
Positive ignition time: 0 ms ... 50 ms / Auto, step 10 ms (Default = Auto)
Negative ignition current (ACDC): 100 % ... 300 % / Auto, Step 1 % (Default = Auto)
Ignition current (DC): 100 % ... 300 % / Auto, step 1 % (Default = Auto)
Negative ignition time (ACDC): 0 ms ... 950 ms / Auto, step 10 ms (Default = Auto)
Ignition time (DC): 0 ms ... 950 ms / Auto, step 10 ms (Default = Auto)
Slight upslope: OFF / ON (Default = OFF)
Startup level:5 % ... 40 %, step 1 % (Default = 10 %)
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
Downslope cut level: 5 % ... 40 %, step 1 % (Default = 10 %)
2T downslope cut: OFF / ON (Default = OFF)
Nonlinear downslope: 0 % ... 50 %, step 1 % (Default = 0 %)
Current freezing: OFF / ON (Default = OFF)
TIG antifreeze: OFF / ON (Default = OFF)
AC phase swap current: 5 A ... 20 A / Auto
MMA settings:
Welding current: Min/Max = Normal welding current limits
Hot start: -10 ... +10, step 1 (Default = 0)
Arc force: -10 ... +10, step 1 (Default = 0)
MMA antifreeze: OFF / ON (Default = OFF)
VRD mode: OFF / ON (Default = OFF)
>> This setting can be locked so that the user cannot change it. In the equipment models where the VRD
mode is locked permanently to ON (e.g. AU model), the VRD option is still visible in the settings, but it can­not be changed.
System settings:
Gas test: Gas test time:0 s ... 60 s, step 1 s (Default = 20 s)
>> Activating this starts the gas test with default time. Time can be changed by turning the control knob. Gas
test can be stopped by pressing the control knob again.
Water cooler: OFF / Auto / ON (Default = Auto)
Cooler flow watch:OFF / ON (Default = ON)
Brightness:10 % ... 100 %, step 1 % (Default = 100 %)
Weld data time:1 s ... 10 s, step 1 s (Default = 5 s)
Screen saver: Default = Kemppi logo
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Operating manual - EN
>> An alternative screen saver image can be used. For more information, refer to "Screen saver" on page50.
Screen saver time: OFF / 1 min ... 120 min, step 1 min (Default = 5 min)
Date:Date setting (DD/MM/YYYY)
Time (24h): Time setting (HH:MM)
Language: Language setting
Factory reset... : Cancel / Start (Default = Cancel)
>> Settings item that activates the factory reset to restore factory settings on the device. >> Once the factory reset is complete, the power source must be restarted manually.
* Current range adjustable by welder in TIG welding:
• 2 A ... 130 A, 1 A step (MasterTig 235, limited supply mode)
• 2 A ... 235 A, 1 A step (MasterTig 235)
• 2 A ... 305 A, 1 A step (MasterTig 325, 335)
• Default = Nominal value of the power source.
* Current range adjustable by welder in MMA welding:
• 8 A ... 85 A, 1 A step (MasterTig 235, limited supply mode)
• 8 A ... 185 A, 1 A step (MasterTig 235)
• 8 A ... 255 A, 1 A step (MasterTig 325, 335)
• Default = MMA maximum current of the power source.
"Welding processes and features" on page67
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Operating manual - EN

3.3.8 Info view

In the Info view you can see information about the equipment usage as well as software version for example.
Included in the Info view:
• Usage counters
• Error status and error log
• Latest welds
• Power source type and model
• Power source and control panel software versions.
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3.3.9 Screen saver

The screen saver image shown during start-up and when the control panel has been idle for a predefined time can be changed using the screen saver tool at kemp.cc/screensaver. To make the change, you'll need the image file you are planning to use and a USB memory stick.
Tools:
• Screwdriver, Torx head (T20).
1. On a web browser, go to kemp.cc/screensaver.
2. Following the on-screen instructions, upload, edit and download the new screen saver image onto a USB
memory stick.
3. Detach the control panel from the power source:
>> Remove the top screw and panel cover. >> First pull the top of the control panel slightly and then the rest of the panel.
Do not disconnect the control panel cable. The power source and control panel must be turned on.
4. Connect the USB memory stick to the USB connector on the rear side of the control panel. The control panel
detects your USB memory stick automatically and shows a list of available images.
Always connect and disconnect the USB device in a straight angle to avoid any additional stress to the USB connector.
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5. Following the on-screen instructions, and using the control panel controls, select the image on the USB
memory stick you want to use as a screen saver.
6. Remove the USB memory stick and install the control panel back in place. Refer to "Installing control panel" on
page9 for more information.
To delete a custom screen saver image from the control panel memory, or to use the Kemppi logo instead, go to "Set­tings view" on page46.
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Operating manual - EN

3.4 Operating cooling unit

1. Ensure there is cooling liquid in the tank and that the welding torch is connected.
2. Press and briefly hold the cooling liquid circulation button on the cooling unit’s front. This activates a pump
motor which pumps the cooling liquid into the hoses and to the welding torch.
3. Observe the cooling system throughout the cooling liquid circulation process.
The cooling liquid circulation can be stopped at any time by pressing the cooling liquid circulation button again. If the system does not fill up during 1 minute after the button has been released, the automatic filling stops.
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3.5 Remote control

For installing remote control, refer to "Installing remote control" on page18.
Hand remote control:
To adjust the welding current, turn the knob on the remote control.
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
Tip: The remote control comes equipped with a handy clip for hanging the remote onto your belt.
Foot pedal remote control:
To adjust the welding current, press the pedal.
Tip: To shift the foot pedal position on the floor, use the foot pedal handle.
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Operating manual - EN

4. MAINTENANCE

When considering and planning routine maintenance, consider the operating frequency of the welding system and the working environment.
Correct operation of the welding machine and regular maintenance helps you avoid unnecessary downtime and equipment failure.
Disconnect the power source from the mains before handling electrical cables.
If the welding equipment is left unused for a longer period, disconnect the mains plug from the mains.
Do not use the mains plug as a power ON/OFF switch.
Always check before use that interconnecting cable, shielding gas hose, earth return cable/clamp and mains cable are in serviceable condition. Ensure that the connectors are correctly fastened. Loose connectors can impair welding per­formance and damage connectors.
Daily maintenance
Maintenance of power source
Follow these maintenance procedures to maintain the proper functioning of the welding system:
• Check that all covers and components are intact.
• Check all the cables and connectors. Do not use them if they are damaged.
For repairs, contact Kemppi at www.kemppi.com or your dealer.
Periodic maintenance
Only an authorized electrician is allowed to carry out electrical work.
Only qualified service personnel is allowed to carry out periodic maintenance.
Before removing the cover plate, disconnect the power source from the mains and wait for about 2 minutes before dis­charging the capacitor.
Check the electric connectors of the unit at least every six months. Clean oxidized parts and tighten loose con­nectors.
Use the correct tension torque when fastening loose parts.
Clean the outside parts of the unit from dust and dirt, for example, with a soft brush and vacuum cleaner. Also clean the ventilation grill at the back of the unit. Do not use compressed air, there is a risk that the dirt will compact even more tightly into gaps of cooling profiles.
Do not use pressure washing devices.
© Kemppi
54/77 1920900 / 1939
Page 55
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
Service workshops
Kemppi Service Workshops complete the welding system maintenance according to the Kemppi service agreement.
The main aspects in the service workshop maintenance procedure are:
• Cleanup of the machine
• Maintenance of the welding tools
• Checkup of the connectors and switches
• Checkup of all electric connections
• Checkup of the power source mains cable and plug
• Repair of defective parts and replacement of defective components
• Maintenance test
• Test and calibration of operation and performance values when needed.
Find your closest service workshop at Kemppi website.

4.1 Disposal

Do not dispose of any electrical equipment with normal waste!
In observance of WEEE Directive 2012/19/EU on waste of electrical and electronic equipment and European Directive 2011/65/EU on the restriction of the use of certain hazardous substances in electrical and electronic equipment, and their implementation in accordance with national law, electrical equipment that has reached the end of its life must be collected separately and taken to an appropriate environmentally responsible recycling facility. The owner of the equipment is obliged to deliver a decommissioned unit to a regional collection center, as per the instructions of local authorities or a Kemppi representative. By applying these European Directives you improve the environment and human health.
© Kemppi
55/77 1920900 / 1939
Page 56
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

5. TROUBLESHOOTING

The problems and the possible causes listed are not definitive, but suggest some typical situations that may turn up during normal use of the welding system. For further information and assistance, contact your nearest Kemppi service workshop.
If you have received an error code, refer also to "Error codes" on the next page .
General:
The welding system does not power up
• Check that the mains cable is plugged in properly.
• Check that the mains switch of the power source is at the ON position.
• Check that the mains power distribution is on.
• Check the mains fuse and/or the circuit breaker.
• Check that the earth return cable is connected.
The welding system stops working
• The torch may have overheated. Wait for it to cool down.
• Check that none of the cables is loose.
• The power source may have overheated. Wait for it to cool down and see that the cooling fans work properly
and the air flow is unobstructed.
Welding torch:
The torch overheats
• Make sure the torch body is properly connected.
• Make sure that the welding parameters are within the range of the welding torch. If different torch com-
ponents have separate limits for the maximum current; the lower one of these is the maximum current that can be used.
• Make sure the coolant circulation is working normally (see the coolant circulation warning LED on the power source).
• Measure the coolant circulation speed: detach the coolant output hose from the cooler unit when the power source is on, and let the coolant run into a measurement cup. The circulation must be at least 0.5 l/min.
• Make sure you are using original Kemppi consumable and spare parts. Incorrect spare part materials may also cause overheating.
• Make sure the connectors are clean, undamaged and properly fastened.
Weld quality:
Dirty and/or poor weld quality
• Check that the shielding gas has not run out.
• Check that the shielding gas flow is unobstructed.
• Check that the gas type is correct for the application.
• Check the polarity of the torch/electrode.
• Check that the welding procedure is correct for the application.
• Check that the filler material is correct type/diameter for the application and clean
• Check that the electrode is correct size/type and correctly shaped for the application
• Check that the base material is clean
• Check that the groove type is correct for the application.
© Kemppi
56/77 1920900 / 1939
Page 57
MasterTig 235ACDC, 325DC, 335ACDC
Tip: For checking the correct welding settings, you can also use Weld Assist.
Varying welding performance
• Check that the welding torch is physically intact and the nozzle is clear of any obstructions.
• Check that the welding torch is not overheating.
• Check that the earth return clamp is properly attached to a clean surface of the workpiece.

5.1 Error codes

Error code
Error descrip­tion
Possible reason Proposed action
Operating manual - EN
1 Power source
not calibrated
2 Too low
mains voltage
3 Too high
mains voltage
4 Power source
is overheated
17 Phase is miss-
ing from mains supply
20 Power source
cooling fail­ure
24 Cooling liquid
overheated
26 Cooling liquid
not cir­culating
27 Cooler not
found
Powersourcecalibration has been lost. Restart the power source. If problempersists, contact
Kemppi service. Note: The equipment operation is limited whenthis erroroccurs.
Voltage in mains network is too low. Restart the power source. If problempersists, contact
Kemppi service.
Voltage in mains network is too high. Restart the power source. If problempersists, contact
Kemppi service.
Too long weldingsession with high power. Do not shut down, let the fans cool the machine. If fans are
not running, contact Kemppiservice.
One ormorephases are missing fromthe mainssupply.
Cooling capacity isreduced in the power source.
Too long weldingsession with high poweror highambient temperature.
No cooling liquid or circulation is blocked. Check the liquid level in the cooler.Check hoses and con-
Cooling is turnedon in the settings menu, but cooler is not connectedto powersourceor cabling is faulty.
Check the mains cable and its connectors. Check the voltageof mains supply.
Clean the filters and clear any dirt from the cooling channel. Check that the cooling fansarerunning.If not, contact Kemppi service.
Do not t urn off t he cooler.Let the liquidcirculate untilthe fans cool it down.If fans are not running, contact Kemppi service.
nectorsfor blockage.
Check the cooler connections. Ensure that the cooling is turned off in the settings menu, ifthe cooler is not in use.
34 Unknown
welding load
35 Too high
mains current
36 DC-link under-
voltage
37 DC-link over-
voltage
38 Mains voltage
too high or too low
© Kemppi
An unknown load connected to DIXcon­nectors.
Current drawn fromthe mains is too high. Reduceweldingpower.
DC-link voltageis too low. Check the mains voltage and/orthe supply cable.
DC-link voltageis too high. Check the mains voltage.
Mains voltage is too highor too low. Check the mains voltage and/orthe supply cable.
Removeany unintended resistive load connected to the weldingequipment and restart the power source.
57/77 1920900 / 1939
Page 58
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
40 VRD error
80 Torch cooling
required
81 Welding pro-
gram data missing
244 Internal
memory fail­ure
250 Internal
memory fail­ure
Open circuit voltageexceedsthe VRD limit. Restart the power source. If problempersists, contact
Kemppi service.
Watercooledtorch is connected but the cooler is turnedoff.
Weldingprogram data has been lost. Restart the power source. If problempersists, contact
Initialization failed. Restart welding system. If problem persists, contact
Memory communication failed. Restart welding system. If problem persists, contact
Turnthe cooleron in the settingsmenu or changet he torch to an air cooled model.
Kemppi service.
Kemppi service.
Kemppi service.
© Kemppi
58/77 1920900 / 1939
Page 59

6. TECHNICAL DATA

"Power source MasterTig 235ACDC" below
"Power source MasterTig 325DC" on page61
"Power source MasterTig 335ACDC" on page63
"Cooling unit MasterTig Cooler M" on page65
For ordering codes, see "Ordering codes" on page76.

6.1 Power source MasterTig 235ACDC

MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
MASTERTIG 235ACDC GM
Feature Description Value
Mains connection cable
Mains connection voltage 1~ 50/60 Hz
Maximum supply current
Effective supply current
Fuse
No-load voltage (
No-load voltage (
No-load voltage (
Open circuit voltage (average) MMA
Rated maximum output at 40 °C (240 V) (Duty cycle and process specified in the next column)
) MMA
U
r
) MMA/TIG
U
0
) MMA
U
r V RD
40 % TIG
60 % TIG
100 % TIG
37 % MMA
60 % MMA
100 % MMA
1~, 2.5 mm
110 / 220...240 V 110 / 240 V
27 A 25 A
16 A 15 A
16 A 15 A
50 V 23 V (locked to VRD)
91 V 91 V
23 V 23 V
50 V 23 V (locked to VRD)
230 A / 19.2 V 230 A / 19.2 V
200 A / 18 V 200 A / 18 V
170 A / 16.8 V 170 A / 16.8 V
180 A / 27.2 V 180 A / 27.2 V
150 A / 26 V 150 A / 26 V
120 A / 24.8 V 120 A / 24.8 V
2
235ACDC GM (VRD locked on)
1~, 2.5 mm
2
Rated maximum output at 40 °C (110 V) (Duty cycle and process specified in the next column)
Range of output (240 V) TIG
© Kemppi
40 % TIG
60 % TIG
100 % TIG
40 % MMA
60 % MMA
100 % MMA
MMA
130 A / 15.2 V 130 A / 15.2 V
120 A / 14.8 V 110 A / 14.4 V
90 A / 13.6 V 90 A / 13.6 V
85 A / 23.4 V 85 A / 23.4 V
75 A / 23.0 V 75 A / 23.0 V
55 A / 22.2 V 55 A / 22.2 V
3 A / 1 V ... 230 A / 31 V 3 A / 1 V ... 230 A / 31 V
10 A / 10 V ... 180 A / 40 V 10 A / 10 V ... 180 A / 40 V
59/77 1920900 / 1939
Page 60
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
MASTERTIG 235ACDC GM
Feature Description Value
Range of output (110 V) TIG
MMA
Power factor, λ 230 V, MMA 180 A /
27.2 V
Efficiency, ƞ 230 V, MMA 120 A /
24.8 V
Idle power TIG
Operating temperature range
Storage temperature range
EMC class
Degree of protection
External dimensions LxWxH
Weight without accessories
Arc-on signal for relay
Voltage supply for cooling unit U
cu
3 A / 1 V ... 130 A / 24 V 3 A / 1 V ... 130 A / 24 V
10 A / 1 V ... 85 A / 35 V 10 A / 1 V ... 85 A / 35 V
0.99 0.99
84 % 84 %
20 W 20 W
-20...+40 °C -20...+40 °C
-20...+60 °C -20...+60 °C
A A
IP23S IP23S
544 x 205 x 443 mm 544 x 205 x 443 mm
19.1 kg 19.1 kg
24 V / 50 mA 24 V / 50 mA
220...240 V (cooler not sup­portedin 110 V)
235ACDC GM (VRD locked on)
240 V (coolernot supported in 110 V)
Recommended generator power (min)
Wireless communication type:
- Control panels MTP23X, MTP33X, MTP35X
- Remote controls HR45, FR45
(2
Wired communication type
Arc striking voltage
Stick electrode diameters ø mm
Standards
2)
NO: These devices are not allowed to be used within a 20 km radius of the centre of Ny-Ålesund at Svalbard, Nor-
S
gen
Transmitter frequency and power
(2
Remote
CAN BUS
way. This restriction applies to any 2-32 GHz transmitter operation.
8 kVA 8 kVA
2.4 GHz Bluetooth, 2400-
2483.5 MHz, 10 dBm
Analog Analog
Kemppi Remote-Bus KemppiRemote-Bus
5...11 kV 5...11 kV
1.6...5.0 mm 1.6...5.0 mm
IEC6 0974-1,-3,-10 IEC6 1000-3-12 GB 155 79.1
2.4 GHz Bluetooth, 2400-
2483.5 MHz, 10 dBm
IEC6 0974-1,-3,-10 IEC6 1000-3-12 AS 60974.1-2006 GB 155 79.1
© Kemppi
60/77 1920900 / 1939
Page 61
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

6.2 Power source MasterTig 325DC

MASTERTIG 325DC 325DC G 325DC GM
Feature Description Value
Mains connection cable
3~, 2.5 mm
2
3~, 2.5 mm
2
3~, 2.5 mm
2
Mains connection voltage 3~ 50/60 Hz
Maximum supply current
Effective supply current
Fuse
No-load voltage (
No-load voltage (
No-load voltage (
No-load voltage (
Open circuit voltage (aver­age)
Rated maximum output at 40 °C (Duty cycle and process spe­cified in the next column)
Range of output TIG
) MMA
U
r
(1
) AU
U
r
) MMA/TIG
U
0
U
r V RD
MMA
) MMA
MMA
40 % TIG
60 % TIG
100 % TIG
40 % MMA
60 % MMA
100 % MMA
380...460 V 380...460 V 220…230 V; 380...460 V
14…13 A 15...11 A 25 A; 15...11 A
11…10 A 11...8 A 17 A; 11...8 A
16 A 16 A 20 A
50 V 50 V 50 V
23 V 23 V 23 V
75...95 V 75...95 V 75...95 V
23 V 23 V 23 V
50 V 50 V 50 V
300 A / 22 V 300 A / 22 V 300 A / 22 V
230 A / 19.2 V 230 A / 19.2 V 230 A / 19.2 V
190 A / 17.6 V 190 A / 17.6 V 190 A / 17.6 V
250 A / 30 V 250 A / 30 V 250 A / 30 V
230 A / 29.2 V 230 A / 29.2 V 230 A / 29.2 V
190 A / 27.6 V 190 A / 27.6 V 190 A / 27.6 V
3 A / 1 V ... 300 A / 38 V 3 A / 1 V ... 300 A / 38 V 3 A / 1 V ... 30 0 A / 27 V
(@ 220 V)
MMA
Power factor, λ 400 V, MMA 250
A / 30 V
Efficiency, ƞ 400 V, MMA 190
A / 27.6 V
Idle power TIG
Operating temperature range
Storage temperature range
EMC class
Min. short-circuit power of supply network
Degree of protection
External dimensions LxWxH
Weight without accessories
S
sc
10 A / 10 V ... 250 A / 39V10 A / 10 V ... 250 A / 39V10 A / 10 V ... 250 A / 32
V (@ 220 V)
0.93 0.90 0.85
89.4 % 89.4 % 88.7 %
20 W 20 W 20 W
-20...+40 °C -20...+40 °C -20...+40 °C
-20...+60 °C -20...+60 °C -20...+60 °C
A A A
1.7 MVA 1.9 MVA 1.4 MVA
IP23S IP23S IP23S
544 x 205 x 443 mm 544 x 205 x 443 mm 544 x 205 x 443 mm
21.0 kg 21.5 kg 21.5 kg
© Kemppi
61/77 1920900 / 1939
Page 62
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
MASTERTIG 325DC 325DC G 325DC GM
Feature Description Value
Arc-on signal for relay
Voltage supply for cooling
U
cu
24 V / 50 mA 24 V / 50 mA 24 V / 50 mA
380...460 V 380...460 V 220...460 V
unit
Recommended generator
S
gen
20 kVA 20 kVA 20 kVA
power (min)
Wireless communication type:
- Control panels MTP23X, MTP33X, MTP35X
(2
Transmitter fre­quency and power
2.4 GHz Bluetooth,
2400-2483.5 MHz, 10 dBm
2.4 GHz Bluetooth, 2400-2483.5 MHz, 10 dBm
2.4 GHz Bluetooth, 2400-2483.5 MHz, 10 dBm
- Remote controls HR45,
(2
FR45
Wired communication type Remote
CAN BUS
Arc striking voltage
Stick electrode diameters ø mm
Standards
1)
Applies only to the power source model versions where the Voltage Reduction Device (VRD) function is locked
Analog Analog Analog
Kemppi Remote-Bus KemppiRemote-Bus Kemppi Remote-Bus
5...11 kV 5...11 kV 5...11 kV
1.6...6.0 mm 1.6...6.0 mm 1.6...6.0 mm
IEC6 0974-1,-3,-10 IEC6 1000-3-12 AS 60974.1-2006 GB 155 79.1
(1
IEC6 0974-1,-3,-10 IEC6 1000-3-12 AS 60974.1-2006 GB 155 79.1
(1
IEC6 0974-1,-3,-10 IEC6 1000-3-12 AS 60974.1-2006 GB 155 79.1
on.
(1
2)
NO: These devices are not allowed to be used within a 20 km radius of the centre of Ny-Ålesund at Svalbard, Nor­way. This restriction applies to any 2-32 GHz transmitter operation.
© Kemppi
62/77 1920900 / 1939
Page 63
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

6.3 Power source MasterTig 335ACDC

MASTERTIG 335ACDC 335ACDC G 335ACDC GM
Feature Description Value
Mains connection cable
3~, 2.5 mm
2
3~, 2.5 mm
2
3~, 2.5 mm
2
Mains connection voltage 3~ 50/60 Hz
Maximum supply current
Effective supply current
Fuse
No-load voltage (
No-load voltage (
No-load voltage (
No-load voltage (
Open circuit voltage (aver­age)
Rated maximum output at 40 °C (Duty cycle and process spe­cified in the next column)
Range of output TIG
) MMA
U
r
(1
) AU
U
r
) MMA/TIG
U
0
U
r V RD
MMA
) MMA
MMA
40 % TIG
60 % TIG
100 % TIG
40 % MMA
60 % MMA
100 % MMA
380...460 V 380...460 V 220…230 V; 380...460 V
15…13 A 16...12 A 25 A; 16...12 A
11…10 A 11...8 A 17 A; 11...8 A
16 A 16 A 20 A
50 V 50 V 50 V
23 V 23 V 23 V
75 ... 95 V 75 ... 95 V 75 ... 95 V
23 V 23 V 23 V
50 V 50 V 50 V
300 A / 22 V 300 A / 22 V 300 A / 22 V
230 A / 19.2 V 230 A / 19.2 V 230 A / 19.2 V
190 A / 17.6 V 190 A / 17.6 V 190 A / 17.6 V
250 A / 30 V 250 A / 30 V 250 A / 30 V
230 A / 29.2 V 230 A / 29.2 V 230 A / 29.2 V
190 A / 27.6 V 190 A / 27.6 V 190 A / 27.6 V
3 A / 1 V ... 300 A / 38 V 3 A / 1 V ... 300 A / 38 V 3 A / 1 V ... 30 0 A / 27 V
(@ 220 V)
MMA
Power factor, λ 400 V, MMA 250
A / 30 V
Efficiency, ƞ 400 V, MMA 190
A / 27.6 V
Idle power TIG
Operating temperature range
Storage temperature range
EMC class
Min. short-circuit power of supply network
Degree of protection
External dimensions LxWxH
Weight without accessories
S
sc
10 A / 10 V ... 250 A / 39V10 A / 10 V ... 250 A / 39V10 A / 10 V ... 250 A / 32
V (@ 220 V)
0.93 0.90 0.89
86.9 % 86.9 % 86.2 %
20 W 20 W 20 W
-20...+40 °C -20...+40 °C -20...+40 °C
-20...+60 °C -20...+60 °C -20...+60 °C
A A A
1.7 MVA 1.9 MVA 1.4 MVA
IP23S IP23 S IP23S
544 x 205 x 443 mm 544 x 205 x 443 mm 544 x 205 x 443 mm
22.0 kg 22.5 kg 22.5 kg
© Kemppi
63/77 1920900 / 1939
Page 64
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
MASTERTIG 335ACDC 335ACDC G 335ACDC GM
Feature Description Value
Arc-on signal for relay
Voltage supply for cooling
U
cu
24 V / 50 mA 24 V / 50 mA 24 V / 50 mA
380...460 V 380...460 V 220...460 V
unit
Recommended generator
S
gen
20 kVA 20 kVA 20 kVA
power (min)
Wireless communication type:
- Control panels MTP23X, MTP33X, MTP35X
(2
Transmitter fre­quency and power
2.4 GHz Bluetooth,
2400-2483.5 MHz, 10 dBm
2.4 GHz Bluetooth, 2400-2483.5 MHz, 10 dBm
2.4 GHz Bluetooth, 2400-2483.5 MHz, 10 dBm
- Remote controls HR45,
(2
FR45
Wired communication type Remote
CAN BUS
Arc striking voltage
Stick electrode diameters ø mm
Standards
1)
Applies only to the power source model versions where the Voltage Reduction Device (VRD) function is locked
Analog Analog Analog
Kemppi Remote-Bus KemppiRemote-Bus Kemppi Remote-Bus
5...11 kV 5...11 kV 5...11 kV
1.6...6.0 mm 1.6...6.0 mm 1.6...6.0 mm
IEC60974-1,-3,-10 IEC6 1000-3-12 AS 60974.1-2006 GB 155 79.1
(1
IEC60974-1,-3,-10 IEC6 1000-3-12 AS 60974.1-2006 GB 155 79.1
(1
IEC60974-1,-3,-10 IEC6 1000-3-12 AS 60974.1-2006 GB 155 79.1
on.
(1
2)
NO: These devices are not allowed to be used within a 20 km radius of the centre of Ny-Ålesund at Svalbard, Nor­way. This restriction applies to any 2-32 GHz transmitter operation.
© Kemppi
64/77 1920900 / 1939
Page 65

6.4 Cooling unit MasterTig Cooler M

MASTERTIG COOLER M
Feature Description Value
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
Connection voltage U150/60 Hz
Maximum rated supply current I
Rated cooling power at 1 l/min
Cooling power at 1.6 l/min
Recommended coolant
Coolant pressure (max)
Tank volume
Operating temperature range *
Storage temperature range
EMC class
Degree of protection **
External dimensions L x W x H
Weight without accessories
Standards
1max
* With recommended coolant
** When mounted
220...460 V AC, 1~/3~
1.0 A
0.9 kW
1.0 kW
MPG 4456 (Kemppi mixture)
0.4 MPa
3.0 l
-20 ... +40 °C
-20 ... +60 °C
A
IP23S
615 x 206 x 268 mm
12.5 kg
IEC6 0974-2 IEC6 0974-10
© Kemppi
65/77 1920900 / 1939
Page 66
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN

6.5 TIG guide tables

The tables in this chapter are given only as a general guidance. The information provided is based solely on the use of WC20 (grey) electrode and Argon gas.
TIG welding (AC)
Welding current range AC Electrode (WC20) Gas nozzle Gas flow rate
Min. A Max. A ø mm number ø mm l/min (Argon)
15 90
20 150
30 200
40 350
1.6 4 / 5 / 6 6.5 / 8.0 / 9.5 6…7
2.4 6 / 7 9.5 / 11.0 7…8
3.2 7 / 8 / 10 11.0 / 12.5 / 16 8…10
4.0 10 / 11 16 / 17 .5 10…12
TIG welding (DC)
Welding current range DC Electrode (WC20) Gas nozzle Gas flow rate
Min. A Max. A ø mm number ø mm l/min (Argon)
5 80
70 140
140 230
225 330
1.0 4 / 5 6.5 / 8.0 5…6
1.6 4 / 5 / 6 6.5 / 8.0 / 9.5 6…7
2.4 6 / 7 9.5 / 11.0 7…8
3.2 7 / 8 / 10 11.0 / 12.5 / 16 8…10
© Kemppi
66/77 1920900 / 1939
Page 67

6.6 Welding processes and features

MasterTig 235, 325 and 335
2
2T downslope cut
This is a function that allows the user to end the current downslope ramp with a quick press of the torch switch.
A
AC Balance
Function to adjust the positive and negative current cycles in AC TIG welding. Low percentage means that, on average, the welding current is more on the negative side, and high percentage that, on average, the welding current is more on the positive side.
AC Frequency
Function to change the frequency of the alternating current in AC TIG welding. This setting adjusts the number of cycles per second. Used for changing the frequency of the welding current to best match the welder's preference and application.
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
AC phase swap current
Changes the welding current point where crossing the zero begins. Affects only AC TIG.
AC TIG
Alternating current TIG welding process, where the polarity of the electrode alternates rapidly between positive and negative. Used especially in aluminum welding.
AC Waveform
Function to change the wave form of the alternating current in AC TIG welding. Three options are avail­able: sine, square and Optima. The wave form affects the shape of weld bead, penetration of the weld and the noise of the welding process. Select the one that suits the application.
Arc force
Adjusts short circuit dynamics (roughness) of MMA welding by changing, for example, current levels.
Arc time
Tells how long the welding arc has been on.
Auto pulse
TIG welding process, where the welding current alternates between two current levels: base current and pulse current. Only welding current needs to be adjusted and pulse parameters are preset automatically. Used for optimizing the arc characteristics for desired welding applications.
B
Balance maximum
Sets the maximum value for AC balance setting.
Balance minimum
Sets the minimum value for AC balance setting.
© Kemppi
67/77 1920900 / 1939
Page 68
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
Base current
The lower current level of the pulse cycle. In TIG welding, its main tasks are to cool down the weld pool and to maintain the arc.
C
Continuous welding
Normal TIG welding which doesn’t have any pause times.
Current freezing
Welding current can be freezed to a certain level during downslope by pressing the trigger.
D
DC TIG
Direct current TIG welding process, where the polarity of the electrode is either positive or negative throughout the welding process. Negative polarity (DC-) allows high penetration, whereas positive polar­ity (DC+) is used only in special applications.
Double pulse
Double pulse TIG welding can be used for example to increase travel speed or to produce welds with high visual requirements. The welding current is pulsed in two different frequencies: slow and fast. The fast frequency makes the arc more focused, and the slow frequency produces a nice fish-scale appearance to welds.
Downslope
Welding function that determines the time, during which the welding current gradually decreases to the end current level. The value for the downslope time is preset by the user. The value zero means the func­tion is off.
Downslope cut level
The point of welding current where the downslope ends.
H
HF ignition
Ignition mode in TIG welding. In HF ignition, a press on the torch trigger produces a high voltage pulse that creates a spark to ignite the arc. The HF ignition mode must be activated in the control panel.
HF spark force
Adjusts the voltage of the high frequency spark used in ignition.
Hot start
Welding function that uses higher welding current at the start of the weld. After the Hot start period the current drops to normal welding current level. The values for Hot start current level and its duration are preset manually. This facilitates the start of the weld especially with aluminum materials.
I
Ignition current
Adjusts the current level of the negative ignition sequence (TIG).
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Operating manual - EN
Ignition mode
The way in which the welding arc is ignited. In TIG welding, two ignition modes are available: High Fre­quency (HF) ignition and Lift TIG ignition. The HF ignition uses a voltage pulse to initiate the arc, and the Lift TIG ignition needs a physical contact between the electrode and the work piece.
L
Lift TIG current
Contact current in the beginning of Lift TIG ignition.
Lift TIG ignition
Ignition mode in TIG welding. In Lift TIG ignition you briefly touch the work piece with the electrode, then press the trigger and lift the electrode to a small distance from the work piece. The Lift TIG ignition must be activated in the control panel. Also known as “Touch ignition” or “Contact ignition”.
M
Manual pulse
TIG welding process, where the welding current alternates between two current levels: base current and pulse current. Parameters are preset by the user. Used for optimizing the arc characteristics for desired welding applications.
Memory channel
Place to store predefined welding parameter settings. A welding machine can include a number of preset channels. Users can create new channels for their own welding jobs and modify or delete them. Makes parameter selection easier, and in some cases allows transferring settings from one welding machine to another.
MicroTack
TIG welding function, which optimizes the spot welding characteristics. Used for tack welding of thin sheets or materials of different thicknesses. Allows fast and easy creation of clean tack welds with min­imum heat input.
Minilog
TIG welding function, which allows using the torch switch to change between the welding current and Minilog current. Parameters are preset by the user. Welding over tack welds is one application, and it also functions as a "pause current" when the welding position changes for example.
MIX TIG
TIG welding function, where AC TIG and DC TIG processes alternate in predefined manner. Parameters are preset by the user according to welding application. Used especially for optimizing welding of aluminum materials of dissimilar thicknesses.
MMA
Manual arc welding process that uses a consumable electrode. The electrode is covered with flux material that protects the weld area from oxidation and contamination.
MMA antifreeze
A function which automatically decreases the welding current significantly when electrode is touching the workpiece. Can be used for avoiding MMA electrode getting too hot when it’s in contact with the workpiece.
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Operating manual - EN
N
Negative ignition
The sequence of TIG ignition which is on the negative side of the current. It is typically the last part of the ignition with ACDC power sources. With DC power sources, it’s the only part of the ignition with TIG.
Negative ignition current
Adjusts the current level of the negative ignition sequence (TIG).
Negative ignition time
Adjusts the length of the negative ignition sequence (TIG).
Non-linear downslope
Determines a point to which current goes down as fast as possible and then starts normal downslope.
P
Positive ignition
The sequence of TIG ignition which is on the positive side of the current. It is typically the first part of the ignition with ACDC power sources. DC power sources don’t have positive ignition with TIG.
Positive ignition current
Adjusts the current level of the positive ignition sequence. Only in ACDC power sources (TIG).
Positive ignition time
Adjusts the length of the positive ignition sequence. Only in ACDC power sources (TIG).
Post gas
Welding function that continues the shielding gas flow after the arc has extinguished. This ensures that the hot weld does not come into contact with air after the arc is extinguished, protecting the weld and also the electrode. Used for all metals. Especially stainless steel and titanium require longer post gas times.
Pre gas
Welding function that starts the shielding gas flow before the arc ignites. This ensures that the metal does not come into contact with air at the start of the weld. Time value is preset by the user. Used for all metals, but especially for stainless steel, aluminum and titanium.
Pulse current
The higher current level of the pulse cycle. In TIG welding, its main task is to create weld pool or increase the heat of the weld pool.
Pulse frequency
Determines how many pulse cycles is created per second (Hz).
Pulse ratio
Determines how big part of the whole pulse cycle time is spent on pulse current.
Pulse TIG
TIG welding process, where the welding current changes between two current levels: base current and pulse current. Parameters can be set either manually or automatically. Used for optimizing the arc char­acteristics for desired welding applications.
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Operating manual - EN
S
Search arc
Welding function that allows using a brief low current period at the start of the weld. This enables precise start of welding. The parameters are preset by the user.
Slight upslope
This is a function that automatically creates a slight upslope to prevent electrode wearing caused by sud­den current rises with high welding currents. This function has an effect only when the welding current is 100 A or more.
Soft start
Welding function that uses lower welding current at the start of the weld. After the Soft start period the current rises to normal welding current level. The values for Soft start current level and its duration are preset manually. Soft start is used to soften the start period of welding especially with steels.
Spot welding
TIG welding function, which automatically produces a weld of predefined duration. Parameters are preset by the user. This function is used for attaching two pieces of materials with tack welds, for example join­ing thin sheets with low heat input.
Startup level
The point of welding current where the upslope begins.
T
Tail arc
Welding function that allows using a brief low current period at the end of the weld. This reduces weld­ing defects caused by end cratering. The parameters are preset by the user. The value zero means the func­tion is off.
TIG
Manual welding process that typically uses a non-consumable tungsten electrode, a separate filler mater­ial, and an inert shielding gas to protect the weld area from oxidation and contamination during the weld­ing process. The use of a filler material is not always mandatory in TIG welding.
TIG antifreeze
A function which automatically decreases the welding current significantly when electrode is touching the workpiece. Can be used for example to avoid unwanted dilution from electrode to welded metal.
Trigger logic
Welding torches have two alternative operation modes: 2T and 4T. They differ in the way how the trigger operates. In 2T mode you hold the trigger down while welding, whereas in 4T mode you press and release the trigger to start or to stop welding and to use special trigger functions, such as Minilog.
Trigger logic 2T
Trigger operation mode of a welding torch. When you press the trigger down in 2T mode, the shielding gas starts to flow and the arc ignites. Hold down the trigger while welding and release it when you want to stop welding.
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Operating manual - EN
Trigger logic 4T
Trigger operation mode of a welding torch. When you press the trigger down in 4T mode, shielding gas starts to flow but the arc won’t ignite until you release the trigger. To stop welding you press the trigger down again and then release it to extinguish the arc.
U
Upslope
Welding function that determines the time, during which the welding current gradually increases to desired welding current level at the start of the weld. The value for the upslope time is preset by the user. The value zero means the function is off.
V
VRD (voltage reduction device)
A safety device used in welding equipment to reduce the open-circuit voltage to maintain below a certain voltage value. This reduces the risk of electric shock particularly in dangerous environments, such as closed or damp spaces. VRD may also be required by law in certain countries or regions.
W
Weld Assist
A wizard-like utility for easy selection of welding parameters. The utility walks the user step-by-step through the selection of required parameters, presenting the selections in an easily understandable way for a non-technical user. Available in MTP35X control panel in MasterTig product family.
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6.7 Symbols used

Symbol Description
Coolant output
Gas input
Gas output
1-MIG
DPulse(Doublepulse)
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
Carbon arc gouging
TIG
TIGHF ignition
TIGContact ignition
TIGWater Cooling
TIGGas Cooling
MIG
MMA
© Kemppi
Pulse
Soft Start
Hot Start
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Upslope
Crater Fill with Downslope
Crater Fill with Downlevel
Tailarc
Minilog
2T
4T
4T LOG
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
4T LOG + Minilog
MicroTack welding
Continuouswelding
Spot welding
Gas test
Frequencyor Wavelength
Base current
Pulsecurrent
AC Frequency
© Kemppi
AC Sine
AC Square
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Page 75
AC Optima
Remote control
Remote controlin TIG torch
Foot pedal
Highvoltage
Low voltage
Common symbols used in Kemppi documentation:
MasterTig 235ACDC, 325DC, 335ACDC
Operating manual - EN
Symbol Description
Usermanual
CEmark
EMC ClassA
Electricaland electronic waste
Highvoltage (warning)
Protective earth
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Operating manual - EN

7. ORDERING CODES

Equipment Description Ordering code
MasterTig 235ACDC GM
MasterTig 325DC Power source: 300 A DC
MasterTig 325DC G Power source: 300 A DC, generator use
MasterTig 325DC GM Power source: 300 A DC, generator and multi-voltage use
MasterTig 335ACDC Power source: 300 A AC/DC
MasterTig 335ACDC G Power source: 300 A AC/DC, generator use
MasterTig 335ACDC GM
MasterTig Cooler M Cooling unit, multi-voltage use
MTP23X Control panel: Membrane panel, DC
MTP33X Control panel:Membrane panel, AC/DC
MTP35X Control panel: 7" TFT panel, DC, AC/DC
HR43 Wired remote
Power source:230 A AC/DC, generator and multi-voltage use
Power source:230A AC/DC, generator and multi-voltage use, VRDlocked on
Power source: 300 A DC, generator use, VRD locked on
Power source: 300 A AC/DC, generator use, VRD locked on
Power source: 300 A AC/DC, generator and multi-voltage use
MT235ACDCGM
MT235ACDCGMAU
MT325DC
MT325DCG
MT325DCGAU
MT325DCGM
MT335ACDC
MT335ACDCG
MT335ACDCGAU
MT335ACDCGM
MTC1KWM
MTP23X
MTP33X
MTP35X
Availablein January 2020
HR45 Wireless remote
FR43 Wired foot pedal remote
FR45 Wireless foot pedal remote
P43MT Transport unit, 4 wheel undercarriage
T25MT Transport unit, 2 wheel cart
P45MT Transport unit, 4 wheel cart
* VRD (Voltage Reduction Device).
Availablein January 2020
FR43
FR45
P43MT
T25MT
P45MT
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MasterTig 235ACDC, 325DC, 335ACDC

7.1 Accessories

Tip: Letters with the product model names stand for:
W = water-cooled, G = gas-cooled, F = flexible neck, S = S neck, N = no switch (no remote option).
Flexlite TX
Product Ordering code
4 m: 8 m: 16 m:
Operating manual - EN
Flexlite TX 135GF
Flexlite TX 165GF
Flexlite TX 165GS
Flexlite TX 165G
Flexlite TX 225G
Flexlite TX 225GS
Flexlite TX 305WF
Flexlite TX 255WS
Flexlite TX 355W
Flexlite TX 135GFN
Flexlite TX 165GFN
Flexlite TX 165GSN
Flexlite TX 225GN
Flexlite TX 255WSN
Flexlite TX 305WFN
Flexlite TX 355WN
TX135GF4 TX135GF8 TX135GF16
TX165GF4 TX165GF8 TX165GF16
TX165GS4 TX165GS8 TX165GS16
TX165G4 TX165G8 TX165G16
TX225G4 TX225G8 TX225G16
TX225GS4 TX225GS8 TX225GS16
TX305WF4 TX305WF8 TX305WF16
TX255WS4 TX255WS8 TX255WS16
TX355W4 TX355W8 TX355W16
TX135GFN4 TX135GFN8 -
TX165GFN4 TX165GFN8 -
- TX165GSN8 -
TX225GN4 TX225GN8 -
- TX255WSN8 -
- TX305WFN8 -
- TX355WN8 -
External package dimensions, mm (L x W x H): 590 x 390 x 130 / 80.
Flexlite TX remotes (optional)
Product Ordering code
For water-cooledtorch: For gas-cooled t orch:
Flexlite TXR10 remote, roller switch
Flexlite TXR20 remote, rocker switch
Flexlite TX other accessories (optional)
Product Ordering code
Flexlite TX trigger extension
© Kemppi
TXR10W TXR10G
TXR20W TXR20G
SP014802
77/77 1920900 / 1939
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