Miller Auto Arc 160 Manuale d'uso - Pagina 32

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7-14. Troubleshooting − Waviness Of Bead

Possible Causes

Welding wire extends too far out of nozzle.

Unsteady hand.

7-15. Troubleshooting − Distortion

Possible Causes

Excessive heat input.

OM-187 924 Page 30

Waviness Of Bead − weld metal that is not parallel and does not cover

joint formed by base metal.

Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.

Support hand on solid surface or use two hands.

Distortion − contraction of weld metal during welding that forces

base metal to move.

Base metal moves

in the direction of

the weld bead.

Use restraint (clamp) to hold base metal in position.

Make tack welds along joint before starting welding operation.

Select lower voltage range and/or reduce wire feed speed.

Increase travel speed.

Weld in small segments and allow cooling between welds.

Corrective Actions

S-0641

S-0642