Weld Defect Rate
Weld Defect Rate
(OP)
Good day all,
Currently we are tracking our weld defect rate for our shop piping (ASME B31.3 piping and shop AWS D1.1Structural welding)by linear inches, which is giving us a very low repair rate and a. We recently changed from counting linear inches to counting butt welds, the repair rate immediately went up, like from 0.5% to 10%. Is there an industry standard or best practice for tracking weld defect rate?
Currently we are tracking our weld defect rate for our shop piping (ASME B31.3 piping and shop AWS D1.1Structural welding)by linear inches, which is giving us a very low repair rate and a. We recently changed from counting linear inches to counting butt welds, the repair rate immediately went up, like from 0.5% to 10%. Is there an industry standard or best practice for tracking weld defect rate?





RE: Weld Defect Rate
I have had many an argument over this and IMHO the only true reflection is length of total weld versus length of defects.
If you look at the "per butt" system - hypothetically a 5o mm long defect in a 50 nb joint is considered equivalent to a 5 mm defect in a 600 nb joint.
They are both considered defective joints but the amount of "clean" weld is significantly greater in the large bore pipe but the welder receives no recognition of this.
Tracking weld repair rate by butt can be effective on a pipeline where all joints are the same diameter and same thickness but for projects with numerous diameters and thicknesses it can give a totally untrue reflection of welding quality.
Cheers,
DD
RE: Weld Defect Rate
This is the most common way shop performance is tracked in the piping industry. Most shops count total RT shots vs total RT shots rejected to calculate their shop RT reject rate as a whole. I am unsure how it is done in a structural environment.
RE: Weld Defect Rate
RE: Weld Defect Rate