| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce damages on the outer circumferential surface of a workpiece and to reduce wear of an inner circumferential surface of a through-hole, and to shorten the pipe producing time by increasing the passing speed when the workpiece passes the welding position. <P>SOLUTION: The tube welding apparatus 10 includes seven endless movable members 4 and a welding torch 6. Each of the seven endless movable members 4 has a chain 41 which is movable in a circulation path including a straight portion, and is abutted on seven parts in the circumferential direction except for a butted portion 110 on the outer circumferential surface of a workpiece 100 along the axial direction on the straight portion of each chain 41. The welding torch 6 is opposed to the butted portion 110 of the workpiece 100 within a range in which the straight portion in the circulation path of each chain 41 in the axial direction of the workpiece 100 is located. <P>COPYRIGHT: (C)2012,JPO&INPIT |
