不锈钢阀门补焊后必须进行固溶处理吗？

不锈钢铸件补焊后是否要进行PWHT应由使用条件来确定的。通常不需要焊后固溶处理。ASTM A351的注释3也说了这个问题。Note 3 - When austenitic steel castings are to be used in services where they will be subject to stress corrosion, the purchaser should so indicate in his order and such castings should be solution-heat treated following all weld repairs