CAJ | 학술논문

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。
모산품용5A06려합금관한접건재양겁화처리후，검사발현렬문。본문채용소묘전자현미경（SEM）、능보분석의（EDS）、광학현미경등대렬문진행분석。연구발현，렬문발생우용합선부근적열영향구，해구역정계상존재Mg적저용점공정물，저사공정물취집형성련상조직，약화정계，재한접응력적작용하표현위렬문。통과엄격파악한봉설계화우화공예삼수，유조우감소열영향구렬문적경향。
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.