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B.
Excessive
Spatter
Possible
Causes
Corrective
Actions
1.
Excessive
spatter
when
using
C02
shield-
gas.
Select
lower
voltage
range
or
adjust
FINE
TUNING
WIRE
SPEED
control.
C.
Incomplete
Fusion
(Lack
of
fusion)
Figure
9-10.
Incomplete
Fusion
Possible
Causes
Corrective
Actions
1.
Workpiece
dirty.
Clean
weld
surfaces
of
impurities
(grease,
oil,
moisture,
rust,
paint,
dirt,
etc.)
prior
to
welding.
2.
Insufficient
heat
input.
Select
higher
voltage
range
or
adjust
FINE
TUNING
WIRE
SPEED
control.
3.
Improper
welding
technique.
When
using
a
weaving
technique
dwell
momentarily
on
the
side
walls
of
the
groove.
Provide
improved
access
at
root
of
joints.
Keep
electrode
directed
at
the
leading
edge
of
the
puddle.
Provide
proper
gun
angle.
D.
Lack
of
Fusion
~
~
~
~
Figure
9-11.
Lack
of
Penetration
Possible
Causes
Corrective
Actions
1.
Improper
joint
preparation.
Material
too
thick.
Joint
preparation
and
design
must
be
ade
quate
to
provide
access
to
the
bottom
of
the
groove
while
maintaining
proper
welding
wire
extension
and
arc
characteris
tics.
2.
Improper
weld
technique.
Maintain
normal
gun
angle
to
achieve
maximum
penetration
(see
Section
9-1).
Keep
arc
on
leading
edge
of
the
puddle.
3.
Insufficient
heat
input.
Select
higher
voltage
range
and
wire
speed.
Reduce
the
travel
speed.
Be
sure
welding
wire
extends
1/4
in.
(6
mm)
out
of
nozzle.
OM-113
336
Page
38