Miller 3000 Owner's Manual page 63

Table 8-2. Excessive Spatter
.
.
~.....
~
~~-
Excessive Spatter
scattering of molten
metal particles that cool to solid form
near
weld bead.
Possible
Causes Corrective Actions
Amperage too high
for electrode. Decrease amperage
or
select larger electrode.
Arc length
too
long
or
voltage too high Reduce
arc
length
or
voltage.
Table 8-3.
Incomplete
Fusion
Incomplete Fusion failure of weld metal
\ to fuse completely with base metal
or a
preceeding weld bead.
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Possible Causes Corrective Actions
Insufficient heat
input.
Increase amperage. Select
larger
electrode and increase amperage.
Improper welding technique. Place stringer bead in proper location(s) at joint during welding.
Adjust
work
angle
or
widen groove
to
access
bottom during welding.
Momentarily
hold
arc on groove
side walls when using weaving technique.
Keep
arc on
leading edge of weld
puddle.
Workpiece dirty.
Remove all grease,
oil, moisture, rust, paint, coatings, slag,
and dirt from work surface before
welding.
Table 8-4. Lack Of Penetration
Lack
Of Penetration
shallow fusion be
tween weld metal and base metal.
Lack of Penetration Good Penetration
Possible Causes Corrective Actions
Improper joint preparation.
Material
too
thick. Joint
preparation and design must provide
access
to bottom of groove.
Improper weld technique. Keep
arc on
leading edge of weld puddle.
Insufficient heat input.
Increase amperage. Select
larger electrode and increase amperage.
Reduce travel speed.
OM-160 518 Page 26