Hobart STICKMATE LX Owner's Manual page 39

Possible Causes
Amperage too high for electrode.
Arc length too long or voltage too high
Possible Causes
Insufficient heat input.
Improper welding technique.
Workpiece dirty.
Lack of Penetration
Possible Causes
Improper joint preparation.
Improper weld technique.
Insufficient heat input.
Table 6-2. Excessive Spatter
Decrease amperage or select larger electrode.
Reduce arc length or voltage.
Table 6-3. Incomplete Fusion
Increase amperage. Select larger electrode and increase amperage.
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.
Remove all grease, oil, moisture, rust, paint, coatings, slag, and dirt from work surface before
welding.
Table 6-4. Lack Of Penetration
Good Penetration
Material too thick. Joint preparation and design must provide access to bottom of groove.
Keep arc on leading edge of weld puddle.
Increase amperage. Select larger electrode and increase amperage.
Reduce travel speed.
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Excessive Spatter − scattering of molten
metal particles that cool to solid form near
weld bead.
Corrective Actions
Incomplete Fusion − failure of weld metal
to fuse completely with base metal or a
preceeding weld bead.
Corrective Actions
Lack Of Penetration − shallow fusion be-
tween weld metal and base metal.
Corrective Actions
OM-316 Page 35