Miller Electric SYNCROWAVE 250, Technical Manual

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TM-353 Page 16 Syncrowave 250
4-6. AC Balance Control
Ref. S-0795-A
1 AC Balance Control
Balance Control (AC GTAW):
Control changes the AC output
square wave. Rotating the control
towards 10 provides deeper pene-
tration. Rotating the control towards
0 provides more cleaning action of
the workpiece.
When the control is in the Balanced
position, the wave shape provides
equal penetration and cleaning
action.
Application:
When welding on oxide forming ma-
terials such as aluminum or magne-
sium, excess cleaning is not neces-
sary. To produce a good weld, only
a minimal amount, approximately a
0.10 in (2.5mm) of etched zone
along the weld toes is required.
Set control to 7 and adjust as nec-
essary. Joint configuration, set-up,
process variables, and oxide thick-
ness may affect setting.
Arc rectification can occur when
welding above 200 amps and/or
while welding with helium gas. If this
condition occurs, increasing the
Balance control towards maximum
penetration, may help to restabilize
the arc.
Balanced
3
10
0
More Penetration
More Cleaning
50% Electrode
Positive
50% Electrode
Negative
32% Electrode
Positive
68% Electrode
Negative
55% Electrode
Positive
45% Electrode
Negative
Output Waveforms Arc Setting
1