基于惰性气体钨极保护焊受电弓用6082铝合金角接接头开裂分析
Analysis on Cracking of Fillet Weld Joint in Aluminum Alloy 6082 for Pantograph Welded by TIG
摘 要
受电弓在组装时发现下臂主轴与吊耳所组成的角接接头近焊缝区出现表面裂纹, 结合焊接结构和实际工艺, 通过材料理化性能试验、T型接头裂纹敏感性分析、焊接接头裂纹断面宏观和微观检查, 对裂纹产生的原因及机理进行了分析。结果表明: 受电弓下臂主轴与吊耳的焊接接头近焊缝区开裂是由于热输入过大而引起的液化裂纹, 而吊耳装配时的锤击导致该液化裂纹进一步扩展, 形成了沿焊趾的开裂。最后提出了预防裂纹的措施, 保证了产品的焊接质量。
6082铝合金
惰性气体钨极保护焊
角接接头
开裂
pantograph
aluminum alloy 6082
TIG
fillet welded joint
cracking
Abstract
Crack appeared on the surface of bond area of the fillet weld joint consisting of spindle and lifting lug after assembly of lower arm of pantograph. Combination with the welded structure and actual manufacturing process, the causes and mechanisms of the crack were analyzed by physical and chemical properties testing of raw materials, T-joint cracking sensibility analysis, macro and micro inspection on the cross section of welded joints crack. The results showed that the crack near the bond line was caused by excessive welding heat input, however, impact force generated through lifting lug assembly that enlarged and expanded liquation crack. Put forwarded solution of crack, to ensure the welding qualification of production.
中图分类号 U264.3+4
所属栏目 质量控制与失效分析
基金项目 辽宁省教育厅资助项目(2009T012)
收稿日期 2011/11/14
修改稿日期
网络出版日期
作者单位点击查看
备注徐振越(1955-), 男, 教授。
引用该论文: XU Zhen-yue,HUANG Si-jun,ZHAI Li-sa,XU Hong-ji. Analysis on Cracking of Fillet Weld Joint in Aluminum Alloy 6082 for Pantograph Welded by TIG[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2012, 48(9): 618～621
徐振越,黄思俊,翟立飒,许鸿吉. 基于惰性气体钨极保护焊受电弓用6082铝合金角接接头开裂分析[J]. 理化检验－物理分册, 2012, 48(9): 618～621
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参考文献
【1】黄墀才.德国高速铁路受电弓的发展[J].上海铁道科技, 1999(2):47-49.
【2】周万盛, 姚君山. 铝及铝合金的焊接[M].北京: 机械工业出版社, 2006.
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