| 摘要 |
PROBLEM TO BE SOLVED: To enlarge the stirring region of a base metal to an arbitrary region, corresponding to the shape of the welding position of the base metal and its inside state when base metal is subjected to the friction stir welding using a bobbin tool, to attain flexibility and smoothness in friction stir welding, corresponding to the shape of the joined part thus enlarged. SOLUTION: In the friction stir welding apparatus having a bobbin tool 11 which is equipped with a rear face pressing member 11 and a front face pressing member 10 and in which the space between the pressing members is either connected with a fixed or movable base metal stirring shaft (probe shaft), or faced against each other, the shaft line of the base metal stirring shaft is arranged by being changed or displaced relative to the drive shaft line of the stirring shaft 12A which is located on the core shaft of both the pressing members, and the base metal stirring shaft is tilted, bent or curved in the direction away from the center vertical line of the base metal welding or the drive shaft line, corresponding to the stirring property improving position of the base metal, so that the rotational movement of the base metal stirring shaft makes revolving movement centering around the center vertical line of the base metal welding. COPYRIGHT: (C)2004,JPO&NCIPI
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