| 摘要 |
In a method of manufacturing link rod which integrally joins bushes to each end of pipe-shaped arm portion, an extrusion molded bracket material ( 14 ) is formed to have the length allowing N pieces of the arm portions to be arranged in a horizontal row. Engaging projections ( 7 ) provided on the bracket material ( 14 ) are engaged with ends of the arm portions ( 2 ). Then, the ends of the arm portions ( 2 ) are butted against mounting walls ( 15 a) provided on a mounting projection ( 15 ) of the bracket material 14 . N pieces of the arm portions ( 2 ) are arranged without clearance in a horizontal row with respect to the bracket material ( 14 ) to form butted portions in the shape of a continuous straight line. The friction stir welding is carried out along the butted portions. Then, the bracket material ( 14 ) is cut into the width of the bracket ( 4 ). The engaging projections ( 7 ) are formed by forming slits ( 18 ) at given intervals on a horizontal projection ( 17 ) extrusion molded integrally with the bracket material ( 14 ).
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