| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding method by which a defect, etc., never occur in a weld zone when butting a pair of metallic plates with different plate thicknesses and performing friction-stir welding along the boundary line of both plates, a tailored blank metal plate obtained by the method and a welding tool to be used for the above welding method. SOLUTION: This is the welding method to be performed as follows, that is, when subjecting a thick plate 1 and a thin plate 2 made of an aluminum alloy to the friction- stir welding by butting the thick plate 1 and the thin plate 2, which position on the same plane and by moving a welding tool 10 along the boundary surface 4 of both plates 1, 2 while rotating the welding tool 10, an about columnar main body 11 and stirring pins 12, 14 with a thick diameter and a thin diameter, which droop concentrically from the base 11a of the main body 11 and are pushed into the vicinity of the boundary surface 4 of both plates 1, 2, are included in the above welding tool 10. When viewing from a plane, the above welding tool 10 is moved along the boundary surface 4 of both plates 1, 2 while rotating in the clockwise direction, and in plane view, the above thick plate 1 is arranged on the right side in the moving direction of the above welding tool 10.
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