| 摘要 |
<p>In a friction stir welding method, a tool (8) is moved being rotated along portions (11 to 14, C1 to C4; 11 to 14, D1 to D4) to be joined of a work piece (10), where the portions include a corner (C1 to C4; D1to D4) with a smaller curvature that connect two portions (11 to 14) with larger curvatures. The method includes the steps of setting the work piece on a supporting member (2a), rotating the tool around a center axis (S) there of, moving the tool toward the work piece to penetrate a portion of the tool into the work piece at the portions to be joined, and moving and turning the tool along the portions to be joined. A rotation speed of the tool around the center axis thereof is decreased to be smaller at the corner with the smaller curvature than the rotation speed of the tool around the center axis thereof at the portions with the larger curvatures.</p> |
