Dear Sir,
Our welder inadvertently used tungsten containing filler metal corresponding to grade SA 335 Gr. P92 for welding of SA 335 Gr. P91 Pipes.
We are in a fix on what to do now ? Whether to cut the joint & re-weld using filler metal corresponding to Gr. P91 or to accept the joint with P92 filler as it is & proceed for PWHT & further processing. Different people are suggesting differently.
Our worry is that these being high temperature materials, how will this behave metallurgically during service at high temperatures ???
Kindly advice. Thanks in advance.
DDN VERMA.
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