Hobart Welding Products STICKMATE OM-949 - Manual (Page 29)

OM-949 Page 25
Table 6-2. 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 6-3. Incomplete Fusion
Incomplete Fusion − failure of weld metal
to fuse completely with base metal or a
preceeding weld bead.
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 6-4. 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.