| 摘要 |
A method of forming thin steel plate of predetermined dimensions into a tubular form such as a cylindrical or square tubular form and subjecting the side seam or the overlapped portion of the form to electric resistance seam welding by passing it between upper and lower electrodes, which comprises applying a higher welding current to both edge parts of the overlapped portion than to the other parts or the center of the overlapped portion thereby adjusting a welding current to such a value which does not substantially cause the formation of burrs but provides the center with a desired weld strength. |
