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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.
OM-160
518
Page
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