| 摘要 |
PROBLEM TO BE SOLVED: To fit a bracket with high precision and ease by welding to a bent portion formed in a long pipe by plastic working. SOLUTION: The invention relates to a pipe-bracket joining structure (upper frame)46 in which a first bent portion 63 is formed in a frame 61 made of a pipe by means of a bender and the bracket 54 for a stopper is joined to the first bent portion 63 or the vicinity of the first bent portion 63 by welding. The position of the cross section of the first bent portion 63 is determined so that the center of curvature C1 used in bending the frame 61 made of a pipe in consideration of the assumed cross section of the first bent portion 63 comes to a bottom. At the time of determining the position of the cross section of the first bent portion 63, weld beads 77 for fixing the bracket 54 for the stopper are placed at or near the center 87 of the crosswise outer circumferential portion at which the horizontal line passing through the center of the cross section intersects the outer circumferential face 86 of the frame made of a pipe. COPYRIGHT: (C)2005,JPO&NCIPI
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