| 摘要 |
PROBLEM TO BE SOLVED: To join a laminated portion, particularly a portion with different kinds of materials mutually laminated, by means of a friction stir welding tool. SOLUTION: A porous workpiece 12 provided with a through-hole 18 is laminated on an Al alloy-made workpiece 10 to form a laminated portion 16. Then, a probe 20 of a rotatable friction stir welding tool 14 is inserted into the through-hole 18, friction-stirring the upper end face of the Al alloy workpiece 10. As a result, the upper end face and its nearby material rise along the inner circumferential wall of the through-hole 18, forming an annular raised part 28. The annular raised part 28 is cooled and hardened to be joined to the inner circumferential wall of the through-hole 18, thereby the Al alloy workpiece 10 and the porous workpiece 12 are joined together, wherein the screw thread 22 provided on the inner circumferential wall of the through-hole 18 is meshed with the side circumferential wall of the annular raised part 28 to function as a wedge. A stopper 30 may be provided by making the material flow out from the through-hole 18. COPYRIGHT: (C)2007,JPO&INPIT
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