起重机金属结构裂纹修复后再生裂纹的探讨

Exploration of occurring of new crack on metal structures of cranes after old crack was repaired

通过一台门座起重机金属结构裂纹的修复， 分析了修复后又产生裂纹的原因， 从而提出在裂纹修复中应该注意的问题。

With an example of a portal crane,this paper analyses the causes for the occurring of new crack on the metal structure after old crack was repaired and offers some problems with crack repair needing attention.