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40
Welding STT
®
Process
Table21. Exemplify STT
®
non-synergic programs
Wire material
Gas
Wire diameter
0.8
0.9
1.0
1.2
1.4
1.6
Steel
CO
2
-
304
306
308
-
-
Steel
ArMIX
-
305
307
309
-
-
Stainless
HeArCO
2
-
345
347
349
-
-
Stainless
ArMIX
-
344
346
348
-
-
Table 22. Exemplify STT
®
synergic programs
Wire material
Gas
Wire diameter
0.8
0.9
1.0
1.2
1.4
1.6
Steel
CO
2
-
324
326
328
-
-
Steel
ArMIX
-
325
327
329
-
-
Stainless
HeArCO
2
-
365
367
369
-
-
Stainless
ArMIX
-
364
366
368
-
-
Note:
Note that STT
®
is available only with specially equipped Power Wave power sources, like the Power Wave
455M/STT
®
or the Power Wave S350 + STT
®
Module.
STT
®
(Surface Tension Transfer
®
) is a controlled GMAW
short circuit transfer process that uses current controls to
adjust the heat independent of the wire feed speed,
resulting in superior arc performance, good penetration,
low heat input control, reduced spatter and fumes.
The STT
®
process makes welds that require low heat
input much easier without overheating or burning
through, and distortion is minimized.
STT
®
is also ideal for:
••••
Open root welding
••••
Welding on thin materials
••••
Welding on parts with poor fit-up.
During STT
®
welding, sense lead has to be connected to
the workpiece.
Welding STT
®
in non-synergic mode
Manually can set:
•
Wire Feed Speed, WFS [9]
•
Burnback Time
•
Run-in WFS
•
Preflow Time/ Postflow Time
•
Spot Time
•
2-Step/4-Step
•
Crater
•
Wave Controls:
••••
Peak Current
••••
Background Current
••••
TailOut
••••
HOT START
During the STT
®
welding in non-synergic mode, voltage
control is disabled.
125
A
22.5
V
1.0
Steel
CO2
min
m
5.71
306
A
Figure 84
Welding STT
®
in synergic mode
In synergic mode, the welding parameters are optimally
set to the Wire Feed Speed [9].
Wire Feed Speed controls the deposition rate.
Trim [10] is used as a secondary control – the value of
parameter in the upper right side of display [26]. The
Trim setting adjusts the arc length. Trim is adjustable
from 0.50 to 1.50. 1.00 is the nominal setting.
Additionally can manually set:
•
Burnback Time
•
Run-in WFS
•
Preflow Time/ Postflow Time
•
Spot Time
•
2-Step/4-Step
•
Crater
•
Wave Controls:
••••
UltimArc™
••••
HOT START.