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  • Users: Liao DH
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  1. Liao DH

    Effects on PWHT on P22 and A106B

    I am currently working on a new PQR for P22 and A106B welding. I am using a A335 P22 pipe on one side and A106B pipe on the other. Pipe size is 3" sch80. I have done an X-ray before and after the PWHT process and there was no visible defects. My PWHT procedure is as follows, preheat till 230...

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