| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent defective welds, to provide excellent and stable weld zones, to increase the equipment cost, and to prevent complicate setting and regulating works. SOLUTION: A metallic strip 2 is moved, longer sides 3, 4 are brought close to each other to successively form a cylinder, and the distances at a plurality of positions in the axial direction of the cylindrically formed metallic strip 2 are measured by an edge detecting means 17 provided in the convergence region which is on the upstream side of a rotary shaft of a squeeze side roll 7c, and in which the longer sides 3, 4 of the cylindrical metallic strip 2 are converged toward the V-converging point at which the longer sides 3, 4 are brought into contact with each other for the first time by the compressive force of the squeeze side roll 7c. The high energy beam is irradiated in the vicinity of the V-converging point detected through the function approximation based on the results of the distances at a plurality of positions measured by the edge detecting means 17, and the metallic strip 2 is successively joined with each other to manufacture a welded tube 1 by the compressive force of the squeeze side roll 7c on the downstream side of the position of irradiation of the high energy beam.</p> |
