| 摘要 |
PROBLEM TO BE SOLVED: To provide a welded tube having excellent workability in which the butting property is enhanced by reducing the strain given to a metal plate constituting a metal tube as much as possible, and the stress/strain exerted in the tube is reduced. SOLUTION: In this manufacturing method, a metal strip S to form a tube is allowed to advance into a tube forming device while being supported by a receiving roll 12, portions in a vicinity of both ends in the width direction of the strip are curved upwardly by a first side roll 13, the metal strip to the center in the width direction except the portions in a vicinity of both ends in the width direction of the strip is curved upwardly by a second side roll 14, the strip is re-shaped by a fin pass roll 15, the positions of both ends in the width direction of the strip are adjusted, and both ends are butted by a squeeze roll 16 and welded to each other. COPYRIGHT: (C)2005,JPO&NCIPI
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