As for the cracking of steam tube of HP lower cylinder found at the stage of major and minor repair in metalflaw detection, the welded elbow structure and its stress are analysed, and the corresponding advice and countermeasures are suggested.

• 对大同二电厂六台机组在大小修的金属探伤检查中多次发现的高压下缸导汽管弯头焊缝不同程度开裂问题,从高导弯头的焊接结构、力状况等方面进行了分析探讨,并提出了相应的建议和对策。