![]() ![]() Reheat cracking from the bismuth addition are a form of liquid metal embrittlement. Moreover, the reheat cracks are typically found in the coarse-grained region of the heat affected zone (HAZ) of a weldment. The undesirable effects of introducing reheat cracks is of special concern because the nature of these micro cracks is that they may not be detected by routine nondestructive testing such as radiography. The PWHT practice cannot only introduce cracks that may go undetected but also degrade notch toughness thereby reducing the tolerance for cracks.PWHT have the desirable effect of out gassing hydrogen, but in certain steels, it may introduce reheat cracking and/or reduction in notch toughness.Sometimes the critical level of 20 Rockwell C is satisfactory. ![]() Hardness is sometimes used as an index of susceptibility to SCC.
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