摘要
铝合金在用于焊接结构时,由于焊接热循环的作用,出现了因过时效而导致接头热影响区的软化(即沉淀相分解析出)现象,不仅使得接头强度性能降低,同时由于组织的不均匀性和贫铜区的形成,易产生电化学腐蚀破坏,也使接头的应力腐蚀开裂(SCC)敏感性显著增大,这是长期以来一直未获解决的工程实际问题。在此阐述了铝铜系合金焊接接头开裂的机理、接头应力腐蚀开裂的特点以及与焊接工艺的相关性。采用慢应变速率试验和金相观测辅助技术,得到了该类铝合金在不同焊接方法下的焊接接头和母材的应力腐蚀敏感性对比。
Due to the effect of the welding heat cycle,heat affected zone of the welding joint can be soften,that is,the decomposition of precipitation will inevitably be caused by the averaging factor during the aluminum alloy used for welding structure.The strength properties of joints will be depressed by the phenomenon.At the same time because of the inhomogeneity of the tissue and the poor copper area,the joints will be easy to produce the electrochemical corrosion damage and the sensitivity of the stress corrosion cracking of joints （SCC） will significantly increase.This engineering problem has been unresolved for along time.The paper mainly describes the aluminum-copper alloy welding joint cracking mechanism,joint stress corrosion cracking characteristics and correlation with the welding technology.The contrast of stress corrosion susceptibility of such aluminum alloy welded joints and the base metal under different welding process is obtained through using slow strain rate testing and microstructure observation assistive technologies.
出处
《电焊机》
北大核心
2010年第11期32-36,共5页
Electric Welding Machine
