A newly (few months old) welded 625 spools with matching filler showed corrosion of the weld and the HAZ (couple of inches on both sides of the weld). This happens for all the welded joints on the pipe. The pipe is offshore. I suspect that no pickling and passivation was done for the welds. I cannot trust what the construction company says about their procedure.
Is there any other opinions? How to verify this without destructive testing? and how to repair it?
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