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GENERAL DESCRIPTION OF
THE STT (SURFACE TENSION
TRANSFER) PROCESS
The STT process cannot be classified as either a con-
stant current (CC) or a constant voltage (CV) applica-
tion. The STT function produces current of a desired
waveform to reduce spatter and fumes. The STT
process is optimized for short-circuit GMAW welding
only.
E-10 E-10
THEORY OF OPERATION
POWER WAVE 455/R
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FIGURE E.8 – STT WAVEFORMS
Current
Time
Wave Control +10.0
Wave Control -10.0
Wave Control 0.00
Current
Time
Trim 1.50
Trim 1.00
Trim 0.50
STT Wave control characteristics
STT Trim control characteristics