Linde BOC RAPTOR 250R MIG Operating Manual page 45

Slag Inclusions
choosing the proper welding current for the type and size of
•
electrode and the welding position
holding the arc as short as possible
•
pausing at each side of the weld bead when a weaving
•
technique is used
using a travel speed slow enough so that the weld metal can
•
completely fill all of the melted out areas of the base metal.
Lack of Fusion
Lack of fusion is when the weld metal is not fused to the base
metal. This can occur between the weld metal and the base metal
or between passes in a multiple pass weld. Causes of this defect
can be:
excessive travel speed
•
electrode size too large
•
welding current too low
•
poor joint preparation
•
letting the weld metal get ahead of the arc.
•
Lack of fusion can usually be prevented by:
reducing the travel speed
•
using a smaller diameter electrode
•
increasing the welding current
•
better joint preparation
•
using a proper electrode angle.
•
Undercutting
BOC RAPTOR 200C & 250R MIG Operating manual
Lack of Fusion
45