| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al alloy welded joint preventing or suppressing the softening and cracking of HAZ, with high joint efficiency. SOLUTION: In this welded joint of aluminum alloy materials, at least the softest part of the heat affected zone has a fibrous structure or a fine equi-axed structure of <=100μm, and the joint efficiency as the ratio betweenσB of the welded joint andσB of the base material is >=60%.
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