Hobart Welding Products 350LX manual Balance/DIG Control, Preflow Time Control

4-9. Balance/DIG Control

(CE Nameplate Only)

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Balance Control Examples

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 Balance/DIG 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.

DIG Control (AC And DC SMAW):

When set at 0, short-circuit amper- age at low arc voltage is the same as normal welding amperage.

When setting is increased, short- circuit amperage at low arc voltage increases.

Application:

Control helps arc starting or making vertical or overhead welds by in- creasing amperage at low arc volt- age, and reduces electrode sticking while welding.

Ref. S-0795-A

4-10. Preflow Time Control

(CE Nameplate Only)

1 1

1 Preflow Time Control

Use control to set length of time that gas flows (0–10 seconds) before arc starts.

Application:

Preflow is used to purge the imme- diate weld area of atmosphere. Pre- flow also aids in consistent arc starting.

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