アーク溶接における冷却過程の解析

―溶着順序の影響―

抄録

Various ideas have been suggested for avoiding the rapid cooling of weld zone which leads to the loss of strength of weld joint. It is considered that one of the most effective means among them is to contrive the deposition sequence of welding arc providing the slower cooling. The strategy often seems to be applied to welding process with rather longer weld beads involved.
The primary purpose of this report is to substantiate the validity of various deposition sequences. Hence, it is to be examined by three-dimensional finite difference methed and arc welding experiments how the deposition sequence employed affects the cooling cycle of weld zone. The effectiveness of the numerical procedure proposed here is verified by comparing numerical results of such important factors as cooling curve and cooling rates with those by experiment.