Snap-On MIG125, MIG135 Operating Instructions Manual
OPERATING INSTRUCTIONS
3.300.909
FOR MODELS:
MIG125
IMPORTANT OPERATING INSTRUCTIONS
SAVE THESE INSTRUCTIONS
2
DANGER
Electric welding or plasma cutting cause ultraviolet rays and weld spatter.
Bystanders will be exposed to ultraviolet rays and weld spatter.
Wear welding helmet with appropriate shade lens while using electric
welders or plasma cutters.
Do not allow bystanders while welding or cutting.
Wear safety shield and protective clothing (user and bystanders).
Read and follow instructions.
Ultraviolet rays will burn eyes; weld spatter can cause injury.
WARNING
Acetylene gas does not burn safely with torches.
Do not use torches with acetylene gas.
Read and follow instructions.
Uncontrolled burning can cause injury.
Materials can cause sparks or flying metal when heated which can cause
fire.
Wear safety shield and protective clothing (user and bystanders).
Sparks, fire and flying metal can cause injury.
WARNING
Electrical shock can result from absence of grounding prong.
Do not remove or bypass the grounding prong in any electrical plug.
Electrical shock can cause injury.
Smoke, fumes and gases are created by the welding process.
Use only in well ventilated area.
Avoid breathing smoke, fumes and gases.
Smoke, fumes and gases can cause injury.
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INSTRUCTION MANUAL FOR WIRE WELDING MACHINES
WARNING!
READ, UNDERSTAND AND FOLLOW THIS MAN-
UAL CAREFULLY BEFORE INSTALLING, USING,
OR SERVICING THE WELDING MACHINE, PAYING SPECIAL ATTENTION TO SAFETY RULES. CONTACT YOUR
DEALER IF YOU DO NOT FULLY UNDERSTAND THESE
INSTRUCTIONS.
1 INSTALLATION
This machine must be used for welding only. It must not
be used to defrost pipes.
It is also essential to pay special attention to the chapter
on SAFETY PRECAUTIONS.The symbols next to certain
paragraphs indicate points requiring extra attention,
practical advice or simple information.
This manual must be stored carefully in a place familiar to
everyone involved in using the machine. It must be consulted whenever doubts arise and be kept for the entire
life-span of the machine; it will also be used for ordering
replacement parts.
1.1 PLACEMENT
Unpack the machine and place it in an adequately ventilated area, dust-free if possible, taking care not to block
the air intake and outlet from the cooling slots.
CAUTION!
REDUCED AIR CIRCULATION causes overheat-
ing and could damage internal parts.
Keep at least 20 inches of free space around the machine.
Never place any filtering device over the air intake points
of this welding machine.
The warranty shall become void if any type of filtering
device is used.
2 DESCRIPTION OF THE MACHINE
A) Switch
Turns the machine on and off.
B) Adjustment switches
By means of these switches one adjusts the welding
voltage.
C) Ground cable
D) Yellow LED
Lights only when the thermostat is tripped and inter-
rupts the machine operation.
F) Welding torch
G) Handle
Use this handle to lift the machine.
3 GENERAL DESCRIPTIONS
3.1 SPECIFICATIONS
This welder is used for welding soft steel, stainless steel
and aluminium.
3.2 EXPLANATION OF TECHNICAL SPECIFICATIONS
N° Serial number, which must always be indicated
in any inquiry regarding the welding machine.
U0 Secondary no-load voltage.
X The duty cycle expresses the percentage of
10 minutes during which the welding machine
can run at a certain current without overheating.
Example: X = 60% at I2 = 100 A
This means that the machine can weld with a
current I2 = 100A for 6 out of 10 minutes, thus
60%.
I2 Welding current
U
2 Secondary voltage with welding current I2
U
1 Rated power voltage.
1~60HzSingle-phase 60-Hz power supply.
I1 Current absorbed at the corresponding welding
current I2
IP21 Degree of housing protection.
Grade one as the second digit means that this
device is not suitable for use outdoors in the rain.
Fig. 1
C
F
G
D
B
E
A
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3.3 DESCRIPTION OF PROTECTION
This device is protected by a normally closed thermostat
on the power transformer.
When the thermostat is tripped the machine stops welding, while the motor-driven fan continues to run and the
yellow LED lights.
After it has been tripped, wait a few minutes to allow the
transformer to cool down.
4 INSTALLATION
WARNING!
The MIG125 must be installed by qualified person-
nel. All connections must be made in full compliance with all applicable rules and regulations.
Make sure that the wire diameter corresponds to the one
indicated on the roller, and mount the wire reel. Make sure
that the welding wire passes through the groove in the
small roller.
Before connecting the power cable 13, make sure that
the power voltage corresponds to that of the welder , then:
a) for permanent connection to the power mains
without a plug, you must insert a main switch having a
suitable capacity in compliance with the rated
specifications.
b) for a plug-socket connection, use a plug having a
suitable capacity in compliance with the rated
specifications. In this case the plug must be used to
completely disconnect the machine from the mains,
after setting the switch 33 to “O” (off).
The yellow-green wire must be connected to the ground
terminal. Connect the ground clamp 21 to the part to be
welded. The welding circuit must not be deliberately
placed in direct or indirect contact with the protection
wire except in the workpiece.
If the workpiece is deliberately grounded using the protection wire, the connection must be as direct as possible, using a wire at least as large as the welding current
return wire, and connected to the workpiece at the same
point as the return wire, using the return wire clamp or a
second grounding clamp placed next to it. All precautions
must be taken to avoid stray welding currents.
Turn the machine on using the switch 33.
Remove the tapered gas tip by turning it clockwise.
Unscrew the contact tip.
Do not press the torch trigger until you have read the
instructions carefully.
It is important to make sure the machine is turned off
whenever changing the wire reel and wire roller, to prevent the wire feed motor from starting accidentally.
Press the torch trigger and release it only when the welding wire comes out.
Welding wire can cause puncture wounds.
Never aim the torch at parts of the body, other people or
metals when loading the welding wire.
Screw the contact tip back on, making sure that the hole
diameter corresponds to the wire used.
Slide the tapered gas welding tip on, always turning
clockwise.
4.1 CONNECTING THE GAS HOSE
The gas cylinder must be equipped with a pressure reg-
ulator and gauge.
If the cylinder is placed on the cylinder holder of the
machine, it must be held in place by the chain provided
and be of an appropriate size to avoid jeopardizing the
stability of the machine.
Connect the gas hose leaving the back of the machine
to the pressure regulator only after the cylinder is in place.
Open the gas cylinder and set the gauge to approxi-
mately 20-25 CFH.
CAUTION: Make sure the gas used is compatible with the
material to be welded.
5 WELDING
5.1 WELDING MILD STEEL
5.1.1 With shielding gas.
Either 75% ARGON + 25% CO2 or 100% CO2 may be
used for welding mild steel.
Connect the cables according to the instructionsgiven in
the plate stuck inside the machine (see figure 2).
Select the welding current by means of the switches 35.
Move the torch near the welding point and press the trigger.
Adjust the potentiometer knob 27 until the welding is
done with a constant, continuous noise.
If the speed is too fast, the wire tends to stick to the piece
and cause the torch to skip; if the speed is too low, the
wire melts in spaced drops or the arc does not remain lit.
When you have finished welding, turn off the machine and
close the gas cylinder.
For the correct welding angle see figure 3.
5.1.2 Without shielding gas.
Connect the cables according to the instructionsgiven in
the plate stuck inside the machine (see figure 2).
Use only diam. .035 flux cored wire that complies with
thestandard AWS AS.20 E71 TII or E71 TGS, suitable for
use without shielding gas.
Connect the ground cable clamp to the workpiece.
After connecting the cables, follow the instructions given
in paragraph 5.1.1.
NOTE: For compact, well-protected welds always work
from left to right and from top to bottom.
Remove all waste after each welding operation.
For the correct welding angle see figure 3.
Fig. 2
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