Owner manual

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
intended only for the purpose of showing how the vari-
ables 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 appli-
cations. (See Figure B.4)
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
general, the peak current is proportional to the 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.
POWER WAVE
®
455M/STT
®
Current
Time
Time
Current
FIGURE B.4
FIGURE B.5
Trim 1.50
Trim 1.00
Trim 0.50
WAVE CONTROL -10.0
WAVE CONTROL 0.0
WAVE CONTROL +10.0