Abstract
Hot cracking in fusion and solid-state welding of aluminum alloys, magnesium alloys, and aluminum alloys to magnesium alloys is discussed. This includes: (1) liquation cracking in the partially melted zones of arc and resistance spot welds, (2) liquation cracking in the stir zones in friction stir welds, and (3) solidification cracking in the fusion zones of arc and resistance spot welds. Recent data of hot tearing (that is, solidification cracking during casting) in magnesium castings, which can be used to study solidification cracking in magnesium welds, are presented. These include the hot tearing susceptibility of new creep-resistant magnesium alloys and the test method used for evaluating the susceptibility.
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