Friction stir spot joining method and the joining device

Challenge in bonding spot FSW, since the area to be metal binding is limited to the vicinity of the pin portion of the welding tool, the bonding strength is that likely to be low. To solve this problem, junction after pushed tool (1) to the article (4), is inclined a predetermined point the rotation axis of the welding tool (1) to (13) as the fulcrum, the welding tool ( by swinging the distal end portion of the 1), to expand the plastic flow region generated with the rotation of the tool. Thus, it was possible to increase the bonding strength.