Lincoln Electric LN-15 - Manual (Page 3)

PROCESS
3/4
Surface Tension Transfer ® (STT ® )
W A V E F O R M C O N T R O L T E C H N O L O G Y ® ™
Comparing
STT ® to conventional processes
Advantages of STT ® replacing short-arc GMAW:
• Reduces lack of fusion
• Good puddle control
• Consistent X-ray quality welds
• Shorter training time
• Lower fume generation & spatter
• Can use various compositions of shielding gas
• 100% CO
2
(on mild steel)
Advantages of STT ® replacing GTAW:
• Four times faster
• Vertical down welding
• Shorter training time
• 100% CO
2
(on mild steel)
• Improved quality welds on stainless, nickel alloys and
mild steel
• Consistent x-ray quality welds
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.
• Stainless steel & other nickel alloys – petrochemical
utility and food industry.
• Thin gauge material – automotive.
• Silicon bronze – automotive.
• Galvanized steel- such as furnace ducts.
• Semi-automatic and robotic applications.
Utilizing
STT ® on Lincoln Welding Systems
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 TAIL-OUT to:
• control heat input (coarse).
Adjust HOT START to:
• control the heat (current) at the start of the arc.
L I N C O L N W E L D I N G S Y S T E M S
F E A T U R I N G S T T
LN-742
The LN-742 semiautomatic wire feeder features a
trigger mode selection for 2-step or 4-step and
time controls for burn-back, spot times and pre-
flow/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 or gun changes.
LN-15
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 perfor-
mance including pulse welding
on a wide variety of steel,
stainless steel, aluminum and
alloy materials.
STT ® -10
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.