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B-7
OPERATION
B-7
STT WELDING
The pictures illustrate the waveshape of current for
the process. They are not drawn to scale, and are
intended only for the purpose of showing how the
variables effect the waveform.
For most programs, peak current is adjusted by wave
control values. A value of +10.0 maximizes the peak
current, while a wave control of -10.0 minimizes peak
current. In general, the peak current is proportional
torch arc length. (See Figure A.8)
POWER WAVE 455/R
T
rim 1.00
T
rim 1.50
Trim 0.50
Wave Control 0.0
Wave Control +10.0
W
ave Control -10.0
Trim in the STT mode adjusts the tailout and background
portion of the waveform. 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)
Current
Current
Time
Time
FIGURE A.7
FIGURE A.8
NOTE: The ranges on Wave Control and Trim are
dependent on the weld programs. The values shown
are typical ranges.