I am preheating a WC6 casting to 850F and then overlaying one side. After the overlay and while hot, the part is moved to the PWHT oven for stress relief at 1250F. Sometimes the overlay cracks and needs to be machined off and re-applied. My question is, is there a limit on the number of times I can stress relief this part? Some procedures state the part must stay hot after welding and go straight to PWHT and others say the part can cool prior to stress relief. Anyone have experience with this material?
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