理化检验-物理分册2024，Vol.60Issue(2)：24-27,4.DOI:10.11973/lhjy-wl202402007
某挖掘机动臂焊缝开裂原因
Cracking reason of welding seam of excavator boom
吴信1
作者信息
- 1. 日立建机(中国)有限公司, 合肥 230601
- 折叠
摘要
Abstract
The boom of a large hydraulic excavator cracked during use.The causes of boom cracking were analyzed by means of macroscopic observation,chemical composition analysis,scanning electron microscope analysis,mechanical property test,metallographic examination and finite element analysis.The results show that the main reason for cracking was that there were unfused defects between the bottom of the internal weld and the base metal,which caused the sharp corner stress concentration in the welding area.At the same time,the non-standard large load bucket significantly increased the stress on the weld surface,and finally led to the fatigue cracking of the weld under the action of cyclic large load.关键词
焊缝/开裂/应力集中/有限元分析/力学性能测试/显微组织Key words
welding seam/cracking/stress concentration/finite element analysis/mechanical properties test/microstructure分类
矿业与冶金引用本文复制引用
吴信..某挖掘机动臂焊缝开裂原因[J].理化检验-物理分册,2024,60(2):24-27,4.
