Invertec®STT®II
STT
DC
3
PHASE
60
Hz
50
Hz
Featuring the Surface Tension Transfer® (STT) Process
Control Heat Input, Spatter and Fume
The revolutionary STT II power source combines high frequency inverter technology with
advanced Waveform Control Technology™ to provide a better welding solution than
traditional short arc MIG. Unlike CV MIG machines, the STT machine has no voltage control
knob. STT uses current controls to adjust the heat independent of the wire feed speed, so
changes in electrode extension do not affect heat. Low heat input welds can be produced
without overheating or burning through, and distortion is minimized. Spatter and fumes are
reduced because the electrode is not overheated — even when welding with larger
diameter wires and 100% CO2shielding gas.
MIG WELDERS
Processes
GMAW-STT
Advantage Lincoln
• Controlled penetration and outstanding heat input control — Ideal
for welding joints with open root, gaps, or on thin material with no
burnthrough.
• Reduced spatter and fumes — Current is controlled to achieve
optimal metal transfer.
• Reduced welding costs — Ability to use 100% CO2shielding gas
with larger diameter wires.
• Various shielding gases — STT may be used with various gas blends
of Argon including Helium.
• Good bead control and faster travel speeds — Can replace TIG
(GTAW) in many applications without sacrificing appearance.
• Background and Tailout Current accurately control fine and coarse
heat input for reduced distortion and burnthrough as well as proper
penetration.
• Adjustable Hot Start controls the heat at the start of the weld.
• Manufactured under a quality system certified to ISO 9001
requirements and ISO 14001 environmental standards.
• Three-year Lincoln warranty on parts and labor.
Description
Output Input
Base Unit Includes
Twist-Mate® Cable Plugs (Qty. 2), STT II Sense Lead Kit, 25 ft. (7.6m)
Recommended General Options
Power Source Remote Output Control, Inverter and Wire Feeder Cart, Dual
Cylinder Kit, STT II Sense Lead Kit, Coaxial Cable, Twist-Mate Cable Plug,
Twist-Mate Cable Receptacle, Twist-Mate to Lug Adapter
Recommended Wire Feeder Options
STT-10 Wire Feeder, LN-742 Wire Feeder, LN-15 Control Cable Model,
Magnum Gun and Cable Assembly, Magnum Connector Kit
Order
K1525-1 STT II 208/230/460/3/60
K1526-1 STT II International 200/220/380/415/440/3/50/60
K1526-2 STT II International 200/208/380/400/415/3/50/60
K1527-1 STT II CE-Approved 200/220/380/415/440/3/50/60
K1527-2 STT II CE-Approved 200/208/380/400/415/3/50/60
TECHNICAL SPECIFICATIONS
Dimensions
Product Product Input Rated Output Input Current@ Output H x W x D Weight
Name Number Power Current/Voltage/Duty Cycle Rated Output Range inches (mm) lbs. (kg)
Invertec K1525-1 208/230/460/3/60 225A / 29V / 60% 32/30/16A Peak Current: 23.2 x 13.2 x 24.4 117
STT II 200A / 28V / 100% 0-450A (589 x 336 x 620) (53)
K1526-1 200/220/380/415/ Max. OCV: 85V 33/30/18/17/16A Background
International 440/3/50/60 Current:
0-125A
K1526-2 200/208/380/400/ 36/34/20/19/18A
International 415/3/50/60
K1527-1 200/220/380/415/ 33/30/18/17/16A
CE-Approved 440/3/50/60
K1527-2 200/208/380/ 36/34/20/19/18A
CE-Approved 400/415/3/50/60
Publication E4.52 3/05
www.lincolnelectric.com
A CLOSER LOOK
WHAT IS NEXTWELD®?
Nextweld integrates Lincoln’s technologies, processes and products to create a comprehensive, flexible,
user-friendly welding system that can increase
efficiency and reduce fabrication costs. Waveform
Control Technology™ and digital communications
provide the foundation for Nextweld innovations like Pulse-OnPulse™, Power Mode™, STT
for ultimate arc control, high efficiency/reliability and seamless
system integration.
Waveform Control Technology®
Driving Superior Welding Performance
Lincoln’s Waveform Control Technology controls and shapes the output waveforms
(or weld modes) to adapt to virtually any application, material or weld position. Waveform
Control Technology makes it possible to take advantage of Lincoln Nextweld innovations like
the STT Process using the STT II.
For more information see Nextweld Document NX-1.10
STT®(Surface Tension Transfer®) is a controlled
GMAW short circuit transfer process that uses
current controls to adjust the heat independent of
wire feed speed, resulting in superior arc performance, good penetration, low heat input control,
and reduced spatter and fumes.
For more information see Nextweld
Document NX-2.20
®
and ArcLink®. Look for Nextweld
The STT Process
Conventional CV short
circuit transfer using CO
and .045” solid wire.
STT using CO
2
and .045” solid wire.
Note reduced spatter and fume.
2
A. STT produces a uniform molten ball and maintains it
until the "ball' shorts to the puddle.
B. When the "ball" shorts to the puddle, the current is
reduced to a low level allowing the molten ball to wet
into the puddle.
C. Automatically, a precision PINCH CURRENT wave
form is applied to the short. During this time,
special circuitry determines that the short is about
to break and reduces the current to avoid the spatter
producing "explosion".
D. STT circuitry re-establishes the welding arc at a low
current level.
AEDCBA
[2]
E. STT circuitry senses that the arc is re-established, and
automatically applies PEAK CURRENT, which sets the
proper arc length. Following PEAK CURRENT, internal
circuitry automatically switches to the BACKGROUND
CURRENT, which serves as a fine heat control.
Invertec® STT® II
www.lincolnelectric.com
A CLOSER LOOK
USING STT FOR OPEN ROOT WELDING
Open root welding is used for pipe and single-sided plate welding in
situations that preclude welding from both sides of the material. This type
of welding is common in the petrochemical and process piping industries.
Advantages of STT Open Root
Penetration Control
• Provides reliable root pass and complete back bead. Ensures excellent
sidewall fusion.
Cost Reduction
• Uses 100% CO2, the lowest cost gas, when welding carbon steel.
Flexibility
• Provides the capability of welding stainless steel, nickel alloys, and mild
or high strength steels without compromising weld quality.
• Capable of welding out of position.
Low Heat Input
• Reduces burnthrough and distortion.
Low Hydrogen Weld Metal Deposit
Stick welding with cellulose
electrodes provides good fusion
characteristics, but leaves deep
wagon tracks (requiring more labor
for grinding), a very convex root
weld, and a high hydrogen
deposit.
Open Root Pass with Stick
Electrode
Speed
• High quality open root welds at faster travel speeds than GTAW.
Current Control Independent of Wire Feed Speed
• Allows operator to control the heat input to the weld puddle.
Ease of Operator Use
• More forgiving process than conventional short arc welding with
CV machines.
STT Open Root Application
Open Root Pass with STT
provides a weld ligament thickness
of approximately 0.22˝.
• Superior weld profile
(no wagon tracks)
• Slight convexity of root weld
• Low hydrogen deposit
Inside of an 8 in. x .375 in.
wall API 5L-X52 pipe,
welded in 5G position.
STT process using 100% CO2 and .045 in. (1.2mm) wire.
[3]
www.lincolnelectric.com
Invertec® STT® II
A CLOSER LOOK
COMPARING STT TO
CONVENTIONAL PROCESSES
Advantages of STT replacing short-arc
GMAW:
• Significantly reduces lack of fusion
• Good puddle control
• Capable of producing consistent X-ray
quality welds
• Reduced training time
• Lower fume generation and spatter
• Can use various compositions of
shielding gas
• 100% CO2(on mild steel)
Advantages of STT replacing GTAW:
• Four times faster than GTAW
• Vertical down welding
• Reduced training time
• Can use various compositions of
shielding gas
• 100% CO2(on mild steel)
• Welds stainless, nickel alloys and mild steel
• Consistent x-ray quality welds
FEATURES
Key Controls
1. Tailout Control
2. Hot Start Control
3. Peak Current LED Display
4. Peak Current Control Knob
5. 10 Pin Remote Control for Peak and
Background Current
6. 14 Pin Wire Feeder Control with 42V/115V
Auxiliary Power
7. Sense Lead Connection [K940-25, 25 ft. (7.6m)
Sense Lead Kit included]
8. Twist-Mate Output Connectors
(2 Twist-Mate Plugs (M15479) Included)
9. 42V/115V Circuit Breakers
10. Power Switch
11. Background Current Control Knob
12. Background Current LED Display
13. Wire Mode Switch
14. Wire Diameter Switch
WHEN TO USE STT
STT is the process of choice for low heat
input welds.
STT is also ideal for:
• Open root – pipe and plate
• Thin gauge material – automotive
• Stainless steel and nickel alloy –
petrochemical utility and food industry
• Silicon bronze - automotive
• Galvanized steel
• Semiautomatic and robotic applications
1
2
3
4
5
6
7
8
UTILIZING STT ON THE STT II
Adjust WIRE FEED SPEED to:
• control the deposition rate
Adjust PEAK CURRENT to:
• control the arc length
Adjust BACKGROUND CURRENT to:
• control heat input (fine)
Adjust TAILOUT to:
• control heat input (coarse)
Adjust HOT START to:
• control the heat input at the start
of the weld.
14
13
12
11
10
9
QUALITY AND RELIABILITY
• Electronic and thermostatic protection from current overload and
excessive temperatures with thermal indicator light.
• Three-year Lincoln warranty on parts and labor.
• Manufactured under a quality system certified to ISO 9001
requirements and ISO 14001 environmental standards.
Printed circuit boards are environmentallyshielded using Lincoln's engineered potting
and protective frame trays.
[4]
Invertec® STT® II
www.lincolnelectric.com
A CLOSER LOOK
SYSTEM SELECTION
Invertec STT II/STT 10 Deluxe System
Top wire feeder user interface and added traction with four roll
drive system.
• Invertec STT II (K1525-1)
• STT-10 Wire Feeder (K1560-2)
• Power Source to Feeder Cable (K1758-10)
• Drive Roll Kit [KP1505-035S for .035” (0.9mm) wire or
KP1505-045S for .040-.045”(1.0-1.1mm) wire]
• Magnum 200 Gun Package (K497-21)
• Work Cable and Work Clamp
Invertec STT II/LN-15 Portable System
Rugged enclosed feeder - a great system for construction or
shipbuilding.
STT-10 Wire Feeder
• Invertec STT II (K1525-1)
• LN-15 Control Cable Model (K1871-1)
• Control Cable (K1819-10)
• Drive Roll Kit [KP1696-035S for 0.35" (0.9mm) wire or
KP1696-045S for .040-.045” (1.0-1.1mm) wire]
• Magnum 200 Gun Package (K497-21)
• Work Cable and Work Clamp
Invertec STT II/LN-742 Standard System
Two roll drive - the most economical system for STT
shop welding.
• Invertec STT II (K1525-1)
• LN-742 Wire Feeder (with 2 drive rolls) (K617-1)
• Power Source to Feeder Cable (K1840-10)
• Drive Roll Kit [KP653 -035S for .035-.045" (0.9-1.1mm)
wire or KP653-052S for .045-.052" (1.1-1.3mm) wire]
• Magnum 200 Gun Package (K497-21)
• Magnum Connector Kit (K466-1)
• Work Cable and Work Clamp
LN-15 Control Cable Model
LN-742 Wire Feeder
[5]
Invertec® STT® II
www.lincolnelectric.com
RECOMMENDED OPTIONS
GENERAL OPTIONS
Power Source Remote Output
Control
Remotely controls peak and
background current. 10 pin remote
control with 25 ft. (7.6m) of cable.
Order K942-1
Inverter and Wire Feeder Cart
Rear-wheeled cart includes front
casters and no-lift gas bottle
platform. Convenient handles allow
for easy cable storage while full
length side trays store parts and
tools. Shipped fully assembled.
Small footprint fits through
30 inch door.
Order K1764-1
Dual Cylinder Kit
Permits side-by-side mounting of
two full size gas cylinders, with easy
loading. For use with K1764-1 cart.
Order K1702-1
GENERAL OPTIONS CONT.
Twist-Mate Cable Plug
For connecting welding cable to
output terminal receptacles. For 1/02/0 (50-70mm2) cable.
Order K852-70
Twist-Mate Cable Plug
For connecting welding cable to
output terminal receptacles. For 2/03/0 (70-95mm2) cable.
Order K852-95
Twist-Mate Cable Receptacle
For connecting welding cable to
Twist-Mate cable plug. For 1/0-2/0
(50-70mm2) cable.
Order K1759-70
Twist-Mate Cable Receptacle
For connecting welding cable to
Twist-Mate cable plug. For 2/0-3/0
(70-95mm2) cable.
Order K1759-95
STT II Sense Lead Kit
Required to accurately monitor
voltage at the arc for heavy duty
applications. 25 ft. length included
with Invertec STT II. 75 ft. (23m)
length.
Order WK1811-75
Coaxial Cable
Recommended for STT and pulse
welding when using long distances
between feeder and power source.
Order K1796-25
25 ft. (7.6m), 350 amps
Order K1796-50
50 ft. (15.2m), 350 amps
Order K1796-75
75 ft. (22.8m), 325 amps
Order K1796-100
100 ft. (30.4m), 300 amps
Twist-Mate to Lug Adapter
For connection of lugged cable
to Twist-Mate connectors, 18"
(457mm) long.
Order K2176-1
WIRE FEEDER OPTIONS
STT-10 Wire Feeder
The sophisticated STT-10 Process
Controller was designed specifically
to work with the revolutionary STT II
power source. Microprocessor
controls make it easy to develop
optimal procedures and set the
range of operator adjustments.
Dual procedure control can increase
or decrease the energy in the
arc without changing the wire
feed speed.
See Publication E8.190
[6]
Invertec® STT® II
www.lincolnelectric.com
RECOMMENDED OPTIONS
WIRE FEEDER OPTIONS CONT.
LN-742 Wire Feeder
The LN-742 semiautomatic wire
feeder features a trigger mode
selection for 2-step or 4-step and
time controls for burnback, spot
times and preflow/post-flow
shielding gas. Two-roll wire drive
for positive wire feeding. Dynamic
braking system minimizes crater
sticking problems. Tool-less quick
release wire drive tension system
for easy wire on gun changes.
See Publication E8.20
LN-15 Control Cable Model
LN-15 is one of the smallest and
most maneuverable wire feeders
available on the market today.
Control Cable model includes STT
capabilities and is compatible with
the STT II power source for
outstanding welding performance
including pulse welding on a wide
variety of steel, stainless steel,
aluminum and alloy materials.
See Publication E8.60
Magnum 200 Gun and Cable
Assembly
With 15 ft. (4.5mm) cable. For .035.045 (0.9-1.1mm) wire.
Order:
K497-21 for STT-10 and LN-15
K497-1 for LN-742
Magnum Connector Kit
Used for connecting Magnum gun
and cable to assembly.
Order:
K466-1 for LN-742
K466-10 for STT-10 and LN-15
[7]
Invertec® STT® II
www.lincolnelectric.com
INVERTEC® STT® II ORDER FORM
PRODUCT DESCRIPTION ORDER NUMBER QUANTITY PRICE
STT II (208/230/460/3/60) K1525-1
STT II International (200/220/380/415/440/415/3/50/60) K1526-1
STT II International (200/208/380/400/415/3/50/60) K1526-2
STT II CE-Approved (200/220/380/415/440/3/50/60) K1527-1
STT II CE-Approved (200/208/380/400/415/3/50/60) K1527-2
RECOMMENDED GENERAL OPTIONS
Power Source Remote Output Control K942-1
Inverter and Wire Feeder Cart K1764-1
Dual Cylinder Kit K1702-1
STT II Sense Lead Kit, 75 ft. (23m) (included with power source) WK1811-75
Coaxial Cable K1796-xx
Twist-Mate Cable Plug, 1/0-2/0 (50-70mm2) cable K852-70
Twist-Mate Cable Plug, 2/0-3/0 (70-95mm2) cable K852-95
Twist-Mate Cable Receptacle, 1/0-2/0 (50-70mm2) cable K1759-70
Twist-Mate Cable Receptacle, 2/0-3/0 (70-95mm2) cable K1759-95
Twist-Mate to Lug Adapter K2176-1
RECOMMENDED WIRE FEEDER OPTIONS
STT-10 Wire Feeder See Publication E8.190
LN-742 Wire Feeder See Publication E8.20
LN-15 Control Cable Model See Publication E8.60
Magnum 200 Gun and Cable Assembly
- for STT-10 and LN-15 K497-21
- for LN-742 K497-1
Magnum Connector Kit
- for STT-10 and LN-15 K466-10
- for LN-742 K466-1
TOTAL:
CUSTOMER ASSISTANCE POLICY
The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment, consumables, and cutting equipment. Our challenge is to meet the needs of our
customers and to exceed their expectations. On occasion, purchasers may ask Lincoln Electric for advice or information about their use of our products. We respond to our customers based on
the best information in our possession at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability,with respect to such information or advice. We
expressly disclaim any warranty of any kind, including any warranty of fitness for any customer’s particular purpose, with respect to such information or advice. As a matter of practical consideration,
we also cannot assume any responsibility for updating or correcting any such information or advice once it has been given, nor does the provision of information or advice create, expand or alter
any warranty with respect to the sale of our products.
Lincoln Electric is a responsive manufacturer, but the selection and use of specific products sold by Lincoln Electric is solely within the control of, and remains the sole responsibility of the customer.
Many variables beyond the control of Lincoln Electric affect the results obtained in applying these types of fabrication methods and service requirements.
Subject to Change — This information is accurate to the best of our knowledge at the time of printing. Please refer to www.lincolnelectric.com for any updated information.
THE LINCOLN ELECTRIC COMPANY
22801 St. Clair Ave., Cleveland, OH 44117-1199 • 216.481.8100 • www.lincolnelectric.com
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