Grinding on weld cap

why grinding isn’t allowed on weld cap.only buffing allowed.what will happen actually if grinding is done by welder without inspector’s knowledge. will it make any surface defects or why isn’t it allowed??

Grinding cap is allowed or not, which depend in spec requirement.
In order of cap of weldment need to flush for NDT or other purposes (eg, install machine bed, supports, gratting, …).

To answer your question

Re-qualification this welder.

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