| 摘要 |
PROBLEM TO BE SOLVED: To provide a backing member for friction agitation processing which is hardly damaged when a cylindrical workpiece is friction-agitation-processed.SOLUTION: A backing member 6 is so applied to an inner wall surface of a cylindrical workpiece W as to receive pressing force of a tool 31 when friction agitation process is performed by pressing the rotating tool 31 from an outer wall surface side of the cylindrical workpiece W along a join line L where ends e1 and e2 of the cylindrical workpiece W, formed by bending a flat plate material into a cylindrical shape, are abutted to each other. In the backing member 6, a flat part 61 extending along the join line L is formed in an arc-shaped upper surface 60 in contact with the inner wall surface of the cylindrical workpiece W. |
