| 摘要 |
The present invention is equipped with a laser welding device that welds the side ends of a web material (4) respectively to two flange materials (2, 3), and a roller-type web material clamping device (30). The roller-type web material clamping device has multiple first-surface rollers (31) which roll along one surface of the web material and are arranged at intervals in the transport direction, and multiple second-surface rollers (32) which roll along the other surface of the web material and are arranged at intervals in the transport direction, with a prescribed span of the web material (4) in the transport direction that includes at least the position of a welding point in the transport direction being clamped between the multiple first-surface rollers (31) and the multiple second-surface rollers (32). Thus, sputter scattered from the laser welding point does not easily adhere to the portion where the web material is clamped, this portion is not easily affected by the heat from the laser welding point, and the web material can be clamped so as not to deviate from an appropriate butting position with respect to the flange materials. |
