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铝的交流电弧焊接至今尚未得到适当的解决。由于交流电的电弧短,而且燃烧不稳定,因此有人认为用交流电弧焊接铝时必须加装一个稳定器,或者认为根本不可能进行焊接。试验证明,这种说法是不完全正确的,交流电弧不但能焊接铝,而且能得到相当好的质量。对铝的交流电弧焊接工艺,我们曾进行了一系列研究试验,在初期试验中,焊接接头有80％以上是在距离焊缝中心20～40公厘处断裂。从这一现象说明,在焊接中如何减少基本金属的退火时间是非常重要的,焊接前的预热可以缩短焊件在整个焊接过程中承受高温退火的时间,因此对焊缝强度能得到一定程度的改善,因为铝
Aluminum AC arc welding has yet to be properly resolved. Due to the short arc of the alternating current and the instability of the combustion, it has been suggested that a stabilizer must be fitted to the aluminum by AC arc welding or that it is not possible to weld at all. Test proved that this is not entirely correct, AC arc welding not only aluminum, but also get a very good quality. We conducted a series of research trials on aluminum AC arc welding processes. In the initial tests, more than 80% of welded joints were fractured 20-40 mm from the center of the weld. From this phenomenon shows that in the welding how to reduce the annealing time of the basic metal is very important, preheating before welding can shorten the weldment throughout the welding process withstand high temperature annealing time, so the weld strength can be obtained to some extent The improvement because of aluminum