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jic8417(½ð±Ò+1):лл²ÎÓë¡£ 2010-07-09 21:20:29
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jic8417(½ð±Ò+1):лл²ÎÓë¡£ 2010-07-09 21:20:29
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I think you should understand the purpose of pre-hest (PH) and postweld heat treatment (PWHT) first. PH is mainly for minimising the tendency of hydrogen induced cracking. PWHT is mainly for stress relief and softening the weld (including HAZ). Can you tell me the aims your PH and PWHT, and temperatures, duration, etc. |
2Â¥2010-07-07 17:42:03













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