| 摘要 |
A member support of a friction stir spot welding device has a backing piece having a bearing surface that contacts work-pieces, and a supporting body that supports the backing piece. In the backing piece, the amount of change (delta) in the position of the bearing surface on the extension line of the central axis of rotation between a state in which the bearing surface is in a reference state perpendicular to the central axis of rotation (Ac) of a rotary tool) and a state in which the bearing surface tilts in response to the tilting of the work-pieces, is less than or equal to a predetermined embedding amount (ds) with which the shoulder part of the rotary tool is embedded in the work-pieces. |
