摘要
某产品用5A06铝合金管焊接件在阳极化处理后,检查发现裂纹。本文采用扫描电子显微镜(SEM)、能谱分析仪(EDS)、光学显微镜等对裂纹进行分析。研究发现,裂纹发生于熔合线附近的热影响区,该区域晶界上存在Mg的低熔点共晶物,这些共晶物聚集形成链状组织,弱化晶界,在焊接应力的作用下表现为裂纹。通过严格把握焊缝设计和优化工艺参数,有助于减少热影响区裂纹的倾向。
A certain product of 5A06 aluminum alloy pipe welding joint were cracked after anodic oxidation. In this paper, the causes of welding crack were analyzed by means of SEM, EDS and OM. It was observed that the crackle initiated in the heat-affected zone nearby the fusion line where low-melting point eutectics exist. The chain organization finally happens, weakens grain-boundary, and finally shows as crackle under the effect of welding. The technic and process control methods are proposed to improve the crackle effect of heat-affected zone.
出处
《航天制造技术》
2014年第6期50-53,共4页
Aerospace Manufacturing Technology
关键词
5A06铝合金
热影响区
低熔点共晶物
5A06 aluminum alloy
heat-affected zone
low-melting point eutectics
