Miller 3000 Owner's Manual page 65

Table 8-5. Excessive Penetration
~.
Excessive Penetration weld metal melt
ing through base metal and
hanging
un
derneath weld
Excessive Penetration Good Penetration
Possible Causes Corrective Actions
Excessive heat input. Select lower amperage. Use smaller electrode.
Increase and/or maintain
steady
travel speed.
Table 8-6.
Burn-Through
Possible Causes Corrective Actions
Excessive heat
input.
Select lower amperage. Use smaller electrode.
Increase
and/or
maintain steady travel speed.
Table 8-7. 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 8-8. Distortion
Distortioncontraction of weld metal dur
ing welding
that forces base metal
to
move.
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.
Base metal
moves
in the direction of
the weld bead.
Burn-Through weld metal melting
com
pletely through base metal resulting in
holes where
no
metal remains.
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