| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of forming an excellent weld zone between members of different thickness through two processes when the members are butted and friction stir welded. SOLUTION: A first member 10 having a thickness of T<SB>1</SB>and a second member 20 having a smaller thickness of T<SB>2</SB>are placed on a table 40 to form a stepped butted part 30. In the first process, a columnar tool 100 is progressed along the butted part 30 while being rotated; thus a metal is moved from the first member 1 to the second member 20 to thereby form a projecting part substitution part on the stepped part. In the second process, friction stir welding is applied onto the projecting part substitution part 150 using a friction stir welding tool 200 to obtain an excellent weld zone 250. COPYRIGHT: (C)2007,JPO&INPIT
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