铝合金MIG焊接工艺探讨

铝合金导热率/热膨胀系数较大、易氧化,因此焊接时易产生气孔、裂纹、未熔合等缺陷,且焊接热影响区大、焊接变形大,对此必须合理选择焊接工艺。本文首先对铝合金焊接特点与常用焊接工艺进行了分析,探讨了MIG焊接工艺的优缺点,其后通过进一步分析铝合金MIG焊接工艺的发展情况,明确直流双脉冲MIG焊的优越性与机理,最后围绕铝合金MIG焊接工艺的应用试验展开阐述,验证着其实际应用效果,可获得熔宽均匀、成形良好的焊缝。

脉冲MIG焊接工艺与质量控制探析

焊接是一种材料永久性连接的方法,在机械制造、建筑、交通车辆以及航空航天的各个领域均得到广泛应用。焊接方法发展到今天,其数量已不下几十种,尤其是脉冲MIG焊接工艺凭借着焊接效率高、焊缝质量好、应用范围广等诸多优势得到了关注。本文首先分析了脉冲MIG焊接工艺原理与特点,其后具体探讨了脉冲MIG焊接工艺关键点与质量控制,提出脉冲MIG焊质量控制系统的应用,最后就具体的工艺试验展开论述。

铸造铝合金前副车架焊接工艺设计与优化

基于某车型铝合金前副车架开发项目,对铝合金MIG焊接工艺进行了Do E分析与优化设计。同时,对铸-铸铝合金焊接坡口形状进行了设计。相比传统搭焊、对焊工艺,该工艺可保证良好熔深、熔高值,最终保证接口强度275 MPa,达到母材强度的85%以上;接头抗拉强度265~286 MPa,为母材强度的82.8%~86.7%。

铝合金地铁底架T形接头双HV焊缝的MIG焊工艺

文中以某A型铝合金地铁底架结构中T形接头双HV焊缝进行分析,通过选用2种不同层道数的MIG焊工艺参数进行焊接试验,并对试验结果进行分析,得到了该接头的焊缝成形和熔合情况,为此类焊缝MIG焊工艺选用提供一定的参考。

Droplet transition for plasma-MIG welding on aluminium alloys

The synchronous acquisition system of droplet image inspection and arc electric signals were established and the droplet transition characteristics of aluminum alloys were researched in the plasma-MIG welding process.Typical droplet transition modes include globular transfer mode,short circuiting transfer mode,metastable spray transfer mode and projected transfer mode.The result indicates that MIG droplet transfer frequency and droplet transfer modes are changed by introducing the plasma arc in the plasma-MIG welding process compared with the MIG welding on the aluminum alloys,which broadens the range of welding parameters when the stable welding process proceeds.The metastable spray transfer and projected transfer mode are proved to be the most optimal modes by comparing the stability of electronic signal,droplet transition,weld appearance and weld penetration.