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11

Technical Services

Weld Control Characteristics

Parameter Changes & Current Density

Recommendations

Root Pass

Shorter Arc

Finish Pass

Longer Arc

5XXX Alloys

Shorter Arc

Lower Arc Voltage

Higher Amperage

4XXX Alloys

Longer Arc

Higher Arc Voltage

Lower Amperage

Increasing arc voltage reduces arc energy concentration

Increasing arc voltage increases:

„

„

Wire to work piece gap

„

„

Energy distribution width

.047 in. wire diameter = (.0235 in.)

2

x π = .0017 in.

2

section

Arc Length (Voltage)

Penetration (Amperage)

Low

Short

High

Long

20V x 150A = 3 kW

23V x 131A = 3 kW

88 kJ/in

2

sec

77 kJ/in

2

sec

0.32”

0.43”