ABSTRACT The circular-patch welding test was used to study the liquation and liquation cracking of AZ-series Mg alloys. A heat treatment was carried out on the as-received AZ91 alloy to dissolve the γ(Mg17Al12) particles before welding. The circular-patch welding test was then conducted on the heat-treated, as-received AZ91 alloy using AZ61 and AZ91 filler wires. The results showed that the susceptibility of AZ91 alloy to liquation and liquation cracking was significantly reduced by the dissolution of massive γ(Mg17Al12) particles via a heat treatment before welding as the liquation mechanism was changed. Both constitutional liquation and incipient melting occurred in the partially melted zone of the as-received AZ91 welds, while only incipient melting occurred in the heat-treated AZ91 welds.

中文翻译：

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金属间化合物对镁合金焊缝裂化敏感性的影响

摘要 采用圆形补片焊接试验研究了 AZ 系列镁合金的液化和液化开裂。焊接前对 AZ91 合金进行热处理以溶解 γ(Mg17Al12) 颗粒。然后使用 AZ61 和 AZ91 填充焊丝对经过热处理的原样 AZ91 合金进行圆形补焊试验。结果表明，随着液化机理的改变，焊前热处理溶解了块状γ(Mg17Al12)颗粒，显着降低了AZ91合金的液化和液化开裂敏感性。结构液化和初熔均发生在 AZ91 焊缝的部分熔化区，而热处理后的 AZ91 焊缝仅发生初熔。