| 摘要 |
PURPOSE:To considerably improve the quality of weld zones by holding the welding edge parts between rollers and casting a beam to said parts in the case of superposing both edge parts of the works and seam-welding said parts by the beam. CONSTITUTION:A lower pressure roller 18 is disposed below a pair of pressure rollers 12, and while the works W to the welded are pressure-contacted with these rollers, the works are transferred. At this time, a beam L emitted from a light source 12 such as laser beam or electron beam is changed of direction by a reflecting mirror 24, is converted by a lens 26, and is irradiated to the welding parts of the works W past the space 30 between the rollers 12 and 12, whereby welding is accomplished. Since the laser light is convergently and concentrically irradiated to the narrow part, the depth of penetration is large, and the works of thick members may be easily welded as well; moreover, the thermal effect to parts other than the weld zone is small because of the cooling by the rollers; hence, the quality of the weld zone is excellent. |
