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  1. MaterialGrad

    Reject/Accept of punch marks on SS line

    A visual inspection was done on a 12" SCH 40 (10.31mm thick) stainless steel pipe for possible damage. I was asked to investigate if punch marks(+/- 1mm deep) measured on pipe will be detrimental. No fatigue stresses are predicted for this line. Punch marks were introduced to start welding of...

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