High Speed Welding (Sheet Metal)

Welding sheet steel (18 through12 gauge) requires electrodes that weld at high travel speeds with minimum skips, misses, slag entrapment, and undercut.

Procedures

Groove welds . . . . . . . . . . . . . . . . . . . . . . . . . page 20 Edge Welds . . . . . . . . . . . . . . . . . . . . . . . . . . page 20 Fillet Welds . . . . . . . . . . . . . . . . . . . . . . . . . . page 21 Lap Welds . . . . . . . . . . . . . . . . . . . . . . . . . . . page 21 Corner Welds . . . . . . . . . . . . . . . . . . . . . . . . . page 22 Burnthrough Spot Welds . . . . . . . . . . . . . . . . page 23

Alternate Electrodes

When the recommended electrodes are not available, or if preferred, the following electrodes can be substituted using approximately the same procedures:

Electrode

Class

Alternate

Fleetweld 5P

E6010

E6011

Fleetweld 5P+

E6010

E6011

Fleetweld 35

E6011

E6010

Fleetweld 7

E6012

E6013

Fleetweld 37

E6013

E7014

Welding Techniques

Generally, use the highest current possible that will not burn- through, undercut, or melt the edges of lap, corner, or edge welds. Fast welding depends upon the operators skill at staying on the joint and traveling at a uniform speed. A few days practice may be needed by good welders when first starting sheet metal welding.

For maximum welding speed, minimum distortion and flat welds generally position joints for welding 45° to 75° downhill.

The procedure tables assume tight fit-up and adequate clamping or tacking for fast travel speeds and minimum distortion. Use copper backing whenever possible to decrease burnthrough tendencies. When poor fit-up is encountered:

1.Reduce the current.

2.Increase the drag angle.

3.With E6010 or E6011 electrodes use a quick whip technique with a slight circular motion in the crater to bridge the gap.

4.With E6012 or E6013 electrodes, use a small quick weave technique to bridge the gap.

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Lincoln Electric C2.410 manual High Speed Welding Sheet Metal, Alternate