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No.
Imperfect
Root Cause
4
Unstable
welding arc
1.
Loose or worn contact tip or too large in diameter for
the wire thickness.
2.
Uneven wire spool rotation: excessive wear on the
groove of the drive roll and the pressure from the
tensioner roller not adequate.
3.
Too low welding current and fluctuation of arc voltage.
4.
Protruding welding wire outside the the contact tip too
long.
5.
Surface pollution of the workpiece from rust, paint or
grease.
6.
The earth cable set not properly connected.