| 摘要 |
PROBLEM TO BE SOLVED: To easily obtain strong joining in the case of performing friction agitation joining after butting parts is tack welded. SOLUTION: Butting parts of hollow shape materials 10, 20, 30, 40 are intermittently tack welded along joining lines. The start ends of friction agitation welding are protruded as pieces 29, 39. The end parts of the pieces 29, 39 are tack welded. The tack welding W is in a range of the upper faces of projecting parts 25, 35 and the protruding pieces supporting from the start end upper face of a face plate. By this method, the start ends are strongly joined. A rotary tool 340 for friction agitation joining is inserted into a final end side rather than the start end of the tack welding W. By this method, good friction agitation joining is obtained from the start end of friction agitation joining. |
