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[MW:13189] MPI for the copper inclusion

By Materials & Welding
Dear Expert ,

Need your advice on the below matter ,

we are going the GMAW welding with copper backing , and found some copper pick up in the Root surface and check with the AUT and found no indication .
for the more clarification of the effect of the copper , we grind of the copper from the surface and check with the MPI and found some hire line indication and check with the LPT found NO indication. 

I have one clarification , as we know that Copper is non magnetic material and during MPi if we checking and finding such indication it must be copper inclusion instead of crack because its not appearing.

Please advice if making any mistake. 




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Regards,

Rajeev Arora







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