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OM-949 Page 26
Table 6-5. Excessive Penetration
Good Penetration
Excessive Penetration − weld metal melt-
ing through base metal and hanging un-
derneath weld.
Excessive Penetration
Possible Causes Corrective Actions
Excessive heat input. Select lower amperage. Use smaller electrode.
Increase and/or maintain steady travel speed.
Table 6-6. Burn-Through
Burn-Through − weld metal melting com-
pletely through base metal resulting in
holes where no metal remains.
Possible Causes Corrective Actions
Excessive heat input. Select lower amperage. Use smaller electrode with lower amperage.
Increase and/or maintain steady travel speed.
Table 6-7. Waviness Of Bead
Waviness Of Bead − weld metal that is not
parallel and does not cover joint formed by
base metal.
Possible Causes Corrective Actions
Unsteady hand. Use two hands. Practice technique.
Table 6-8. Distortion
Distortion − contraction of weld metal dur-
ing welding that forces base metal to
move.
Base metal moves
in the direction of
the weld bead.
Possible Causes Corrective Actions
Excessive heat input. Use restraint (clamp) to hold base metal in position.
Make tack welds along joint before starting welding operation.
Select lower amperage for electrode.
Increase travel speed.
Weld in small segments and allow cooling between welds.