Abstract: The problem of hydro metal structure fatigue has been neglected by the design, manufacture and installation all the while, but the fatigue break have often been encountered in the project. This article discuses from three aspect of material selection, design and welding on thow to reduce the stress concentration and raze resources for improving the fatigue resistance of welding line.

摘要： 水工金属结构的疲劳问题，一直是水利设计、制造、安装业忽视的问题，但疲劳断裂在工程中时有出现，从选材、设计、焊接三方面谈如何减小应力集中、裂纹源等来提高焊缝的疲劳强度。