溶接凝固過程の固液共存域における温度降下と固相率増加挙動 : Al合金溶接部の凝固に関する研究(第3報)

概要

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It is the ultimate purpose of this investigation to elucidate the fundamental phenomena in cooling and solidification process and to establish reasonably the methods of estimating hot cracking sensitivity and preventing Al alloy weld from hot cracking. In this report, temperature measurement was carried out by CA thermocouple in codling and solidification process on TIG arc spot welds of commercial Al alloy 2024 and 5083 and various analyses were performed. On the basis of the measured value, the authors made Continuous Cooling Solidification Process diagram (CCSP diagram) showing the relation among passed time from arc stop, phase change and the position of welds. By using the CCSP diagram, the authors could investigate the solidification process of the welds. With regard to fraction solid cooling rate (cooling rate in solid-liquid coexisting zone), it was found that the cooling rate at every definite fraction solid was more meaningful than one in a whole solidification time. Increasing behavior of fraction solid were very different between 2024 and 5083 Al alloy at the latter stage of solidification process in the molten pool.
社団法人溶接学会の論文
1990-05-05