CPC B23K 20/123 (2013.01) [B23K 20/125 (2013.01); B23K 20/1255 (2013.01); B23K 2103/16 (2018.08)] | 4 Claims |
1. A friction stir joining device configured to join a to-be-joined object having a first member, a second member, and a third member located in that order with the third member forming a bottom-most member, comprising:
a tool formed in a cylindrical shape and configured to be rotatable on an axis and reciprocatable in a direction along the axis;
a rotary driver configured to rotate the tool on the axis;
a linear-movement driver configured to reciprocate the tool along the axis; and
a control device,
wherein the second member and the third member have melting points higher than the first member,
wherein the third member has hardness higher than the second member, and wherein the control device is configured to:
(A) dispose the tool so as to oppose the first member of the to-be-joined object,
(B) control the linear-movement driver and the rotary driver so that a tip-end part of the tool presses a joined part of the to-be-joined object while the tool is rotated;
(C) control the linear-movement driver and the rotary driver such that (i) the tip-end part of the tool reaches a first position that contacts a portion of the third member, and (ii) the tip-end part of the tool reaches the first position within 11 seconds or less, whereby the third member is softened and extends above an upper surface of the second member to form an anchor part; and
(D) control the linear-movement driver and the rotary driver so that the tool is drawn out from the joined part while the tool is rotated.
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