Miller Shielded Metal Arc Welding Ручні машини - Сторінка 24

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Miller Shielded Metal Arc Welding Ручні машини

4-5. Excessive Penetration

Excessive Penetration

Possible Causes

Excessive heat input.

Select lower amperage. Use smaller electrode.

Improper weld technique.

Adjust travel speed.

4-6. Burn-Through

Possible Causes

Excessive heat input.

Select lower amperage. Use smaller electrode.

Increase and/or maintain steady travel speed.

4-7. Waviness Of Bead

Possible Causes

Unsteady hand.

Use two hands. Practice technique.

4-8. Distortion

Possible Causes

Excessive heat input.

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

Make tack welds along joint before starting welding operation.

Predict anticipated weld distortion and precamber base metal.

Select lower amperage for electrode.

Increase travel speed.

Weld in small segments and allow cooling between welds.

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Excessive Penetration − weld metal

melting through base metal and

hanging underneath weld.

Good Penetration

Burn-Through − weld metal melting

completely through base metal

resulting in holes where no metal re-

mains.

Waviness Of Bead − weld metal that

is not parallel and does not cover

joint formed by base metal.

Distortion − contraction of weld met-

al during welding that forces base

metal to move.

Base metal moves

in the direction of

the weld bead.

Corrective Actions