Slope
Inductance

 

 

 

Variations-
Metal
Transfer
Description
Equipment
Voltage
Power
Supply
Shielding
Gases
Wire
Electrodes
Safety
Welding
Techniques
Welding
Conditions
Economics
Weld
Defects
Mig Spot
Welding
Tables

 

2 VOLTAGE Arc voltage is the voltage between the end of the wire and the workpiece. Because of voltage drops encountered in the welding system, the arc voltage cannot be directly read on the power source voltmeter. Welding voltage (arc length) has an important effect on the type of process variation or metal transfer desired. Short arc welding requires relatively low voltages while spray arc requires higher voltages. It should be noted, too, as welding current and wire burnoff are increased, the welding voltage must also be increased somewhat to maintain stability. Figure 3-2 shows a relationship of arc voltage to welding current for the most common shielding gases employed for mig welding carbon steel. The arc voltage is increased with increasing current to provide the best operation. Figure 3-2 - Arc Voltage-Welding Current Relationship