在铝合金焊接中，选择MIG（金属惰性气体保护焊）还是TIG（钨极惰性气体保护焊）焊接方法取决于具体的焊接需求、材料类型、焊接厚度以及生产效率等因素。
交流TIG焊与脉冲MIG焊
铝及铝合金最为常见的两种焊接工艺是交流TIG焊和脉冲MIG焊。
TIG用于焊接铝板，采用交流焊接。直流反接很少采用，原因就是直流反接，尽管阴极雾化左右效果好，钨极承受高温，易损坏。直流正接可以保护钨极，但没有阴极雾化效果，且铝板熔点低，难以承受高温，易焊穿。 而采用交流焊接，则半周正接，半周反接，可以兼顾阴极雾化和保护钨极的作用。因此实际TIG焊铝，都采用交流焊接。再有就是TIG焊铝都是针对薄板（T
MIG用于铝板焊接，采用直流反接。 不同于TIG的是，充当电极左右的焊丝在焊接过程中是需要熔化形成焊缝金属的，高温有利于焊丝熔化，同时铝板接负极，阴极雾化效果好。 其实，据我所知，所有的熔化极气体保护焊（C02,MAG和MIG），都是采用直流反接工艺。
脉冲MIG焊铝的优缺点
MIG铝焊接优点： 工艺成本低、操作灵活，应用广泛。电弧燃烧稳定，熔滴向熔池过渡平稳，焊缝成形均匀、美观。 热输入和焊接变形小，能够实现大速度自动化焊接，生产效率高。MIG铝焊接缺点： 对焊接材料表面清理要求特别严格。 抗风能力差，不适于野外焊接。
交流TIG焊铝的优缺点
交流TIG铝焊的优点：
操作灵活、方便，熔渣较少，无需焊后清理。 可小电流焊接，易于焊接6mm以下的薄板。 具有阴极清理作用，有利于铝合金表面氧化膜的破碎。交流TIG铝焊的缺点： 焊接速度慢，导致焊接热输入量较大，焊后铝合金的变形和残余应力较大。接头软化程度比较严重，不适宜焊接大厚件。金属熔敷率低，手-眼的协调很难学习，需要大量练习。
选择建议
对于薄板焊接（6mm以下），需要高质量焊缝或焊接灵活性较高的场合，TIG焊接是更好的选择。对于中厚板焊接（50mm以下），要求高效率和低成本的场合，MIG焊接更为合适。
结语
铝及铝合金在现代工程技术所用的各种材料中占有举足轻重的地位，它在世界年产量仅次于钢铁而居第二位，在有色金属中则居第一位 。如果说铝合金最初是在航空工业中崭露头角的话，那么近几十年来，除航空工业外，在航天、汽车、船舶、桥梁、机械制造、电工、化学工业及低温装置中已大量应用铝及铝合金，以制造各种部件、油箱、耐蚀容器及导线等。目前铝合金焊接结构中应用最广的是防锈铝合金，即铝镁合金和铝锰合金。
转自Flama
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