"Pipe welding Root pass"


"What effect will lack of penitration of the root pass have on a 14" sch40 pipe. Welder used 6011 rod for each pass (3 passes total). Root pass does have some penitration but does not meet ASME B31.9"


The effects of lack of penetration (lop) at the root of a pipe butt weld may be (1) none, (2) localized corrosion, (3) lack of needed strength, or, (4) fatigue cracking, depending on the service.


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