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Radiographic test, beacuse It find almost all defects with proper location .
it's the X-Ray which discovered by Wilhelm Rontgen in1895.
Dye Penetrant Testing (DPT)
should be select the suitable ndt method of joints,that means surface ndt or volumatric ndt and this reguirments must copmly with codes and std.
the X-ray test that is the most applicable method in the industry
I think it is the sonic technique used by blacksmiths.
no, it is not X-Ray.. think more & read my question again
GTP
visual testing
