Miller Electric TM-353E AC Balance Control, Setting Output Waveforms, Balance Control AC Gtaw

4-6. AC Balance Control

1

Setting	Output Waveforms	Arc
Balanced	50% Electrode
3	Positive
	50% Electrode
	Negative

More Penetration	32% Electrode
	Positive
	68% Electrode
10	Negative
More Cleaning	55% Electrode
	Positive
	45% Electrode
0	Negative

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

0.10in (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.

Ref. S-0795-A

TM-353 Page 16 Syncrowave 250