铝合金MIG焊常见焊接缺陷分析及预防措施

摘要

It is easily to cause weld defects in the aluminium alloy welding process because of its nature.The weld defects including pores,cracks, fusion defects,etc.Weld defect will affect quality of products. While welding as one general connection method in the railway vehicle production, the weld joint is the weak and easy to destroyed part in aluminium alloy structure.So assurance the weld joint quality is one of key measure to ensure the safety of railway vehicle working.MIG welding is the main weld method in railway vehicle production by now.It will be introduced about reason analysis,damage,prevention measure and solving measures of the weld defects in this test according the production process.%铝合金因其本身特性导致焊接过程中容易产生裂纹、气孔、未熔合等焊接缺陷,对焊接接头性能产生较大影响.焊接作为轨道车辆中普遍采用的连接方法,焊接接头是铝合金结构中比较薄弱的部位,也是结构失效的主要部位.因此保证焊接质量是保证轨道车辆安全运行的关键措施之一.目前高速列车铝合金焊接方法主要采用MIG焊,结合生产实际,分析铝合金MIG焊常见焊接缺陷的产生原因和危害,并提出了预防措施和处理方法.