Dear Experts,
We have typical problem like this:
We are making small cosmetic weld on castings - P1 materials ( WCC and LCC)
Process used is SMAW. we use welding electrode E 7018-1.
We use a preheat of 45-95 Deg C.Interpass being 300 deg C.PWHT is done @ 610 deg C.
We had already demonstrated PQR with the parameters like electrode,current, preheat, interpass,and PWHT, the same are being excercised in the production weld also.
Once after PWHT when we check hardness using portable (Equo-tip) hardness tester we find some welded spots shows high hardness which exceeds NACE requirements (237 HB).
We are facing similar high hard spot on material ASTM A 487- 4C material also.
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