焊接结构件接头处常会有一些焊接缺陷,其中多数外部缺陷容易发现,但焊趾处形成的微观沟槽式咬边和焊瘤下潜伏的未熔合、裂纹具有一定的隐蔽性,容易被忽视而成为一些结构件破坏的根源。通过对装载机动臂几起断裂事故的分析试验,可以得出预防此类缺陷的措施。 Welding structural joints often have some welding defects, of which most of the external defects easily found, but the toe formed at the micro-groove undercut and welding tumor under the unfused, the cracks have a certain degree of concealment, easily overlooked Become the root cause of some structural damage. Through the analysis of several accidents of loader boom, we can draw some measures to prevent such defects.