Operation – Lincoln Electric POWER WAVE SVM173-A User Manual
Page 27
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
affect the waveform.
Trim in the STT mode adjusts the tailout and back-
ground 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 B.4.)
B-9
B-9
OPERATION
POWER WAVE 455M/MSTT
Current
Time
Trim 1.50
Trim 1.00
Trim 0.50
FIGURE B.4 – STT TRIM CONTROL CHARACTERISTICS
Current
Time
Wave Control +10.0
Wave Control -10.0
Wave Control 0.00
FIGURE B.5 – STT WAVE CONTROL CHARACTERISTICS
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 to
torch arc length. (See Figure B.5.)
NOTE: The ranges on Wave Control and Trim are
dependent on the weld programs. The values
shown are typical ranges.