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B-9
OPERATION
B-9
STT WELDING
The pictures illustrate the wave shape of current for the
process. They are not drawn to scale, and are intend-
ed only for the purpose of showing how the variables
effect the waveform.
Trim in the STT mode adjusts the tail out and back-
ground portion of the waveform. For open root
processes, the tail out is fixed, and the trim affects only
the background level. Trim values greater than 1.0 add
more energy to the weld and make the weld puddle
hotter; trim values less than 1.0 reduce energy to weld
A nominal value of 1.0 will work for most applications.
(See Figure A.7)
For most programs, peak current is adjusted by arc
control, also referred to as wave control. A wave con-
trol value of +10.0 maximizes the peak current, while a
wave control of -10.0 minimizes peak current. In gen-
eral, the peak current is proportional to the arc length.
(See Figure A.8)
NOTE: The ranges on Wave Control and Trim are
dependent on the weld programs. The values shown
are typical ranges.
POWER WAVE 455M/STT (CE)
Wave Control 0.0
Wave Control +10.0
Wave Control -10.0
T
rim 1.00
T
rim 1.50
Trim 0.50
Current
Time
Time
Current
FIGURE A.7
FIGURE A.8
Trim 1.50
Trim 1.00
Trim 0.50