When post weld heat treatment is required, the PWHT may be performed by using an approved subcontractor.
如果需要进行后焊热处理，则应由经核准的分包商实施。
This procedure covers the method for casting material's heat treatment, and Post weld heat treatment (PWHT) to weld repair area of castings.
本程序包括铸件材料的热处理方法，铸件焊补区域的焊后热处理方法。
The results show that after post-weld heat treatment(PWHT), the welds of X80 steel seriously embrittle, and the fracture morphology of impact specimens is cleavage.
结果表明，经过焊后热处理后焊缝出现严重的低温脆化，其冲击试样的断口为解理状形貌；
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