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“QW-407.2 A change in the postweld heat treatment (see QW-407.1) temperature and time range. The procedure qualification test shall be subjected to PWHT essentially equivalent to that encountered
in the fabrication of production welds, including at least 80% of the aggregate times at temperature(s).
The PWHT total time(s) at temperature(s) may be applied in one heating cycle.”
请问对于上边这一段怎么理解?如果我的焊接工艺评定焊后热处理参数为(610±10)℃×8hr,那么如果产品热处理工艺要求(610±14)℃×8hr,是不是就不能覆盖(需要重新评定)?反之呢?
如果我的焊接工艺评定高于上转变温度进行热处理,例如正火(930±20)℃×200min,那么如果产品工艺要求正火(930±20)℃×150min,是不是就不能覆盖(需要重新评定)?反之呢?
烦请各位大神帮忙解惑,谢谢。
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