Hobart OM-353 manual Arc Controls, Postflow Time Control, For AC And DC Smaw Welding

4-9. Arc Controls

1

2

1 Arc Control (Dig)

For AC And DC SMAW Welding

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.

Set at 0 for GTAW welding.

2 Arc Control Switch

Place switch in the ON position to turn on arc control circuitry. When switch is in the OFF position, no ad- ditional amperage is available at low arc voltages. Place switch in the OFF position while performing Gas Tungsten Arc Welding (GTAW).

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.

4-10. Postflow Time Control

1 Postflow Time Control

Use control to set length of time (0–70 seconds) gas flows after welding stops. It is important to set enough time to allow gas to flow un-

1til after the tungsten and weld puddle has cooled down.

Application:

Postflow is required to cool tung- sten and weld, and to prevent con- tamination of tungsten and weld. In- crease postflow time if tungsten or weld are dark in appearance.

OM-353 Page 24