64 Overlap

Overlap is the protrusion of weld metal built up beyond the weld toe or weld root.

Overlap is an area of incomplete fusion that creates a stress concentration and can initiate premature failure under load. Overlap is caused when current is set too low. It is detected by visual examination (VT). Overlap is considered a defect that must be removed by grinding according to the applicable fabrication standard or code.

Overlap Prevention

Overlap is prevented by using a higher travel speed or welding current, reducing the electrode diameter, or changing the electrode angle so that the force of the arc will not push molten weld metal over unfused sections of base metal