Acceptance criteria of Weld Defects [ASME B31.3] 

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Dpt me only surface defect detect hota hai.. And in mpi surface and subsurface defect detect hota hai upto 5 mm depth

@@WeldingNDTInspection thank u sir👍

19mm

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Socket weld and branch connections weld which are not radiographer shall be examined by magnetic particle or lpt methods in accordance with Para 344.3 or 344.4

Undercut depth is allowable upto 1 mm and the tw/4 is the length of undercut..

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You are right.

T/10 for T less than 3 mm 0.5 mm for T from 3 mm to 6 mm 1 mm for T greater than 6 mm to 50 mm 1.5 mm for T greater than 50 mm

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generally it is less that 3 percent , however it is not mentioned in any codes and standard .Please follow client requirement and how to calculate the percentage please see below . if welder did 100 joints but RT requirement is only 10%. so we took 10 joint RT. and suppose we have 2 joint repair in those RT joints than %repair = 2/10 * 100 = 20 %

Thickness of weld ..