| 摘要 |
PURPOSE:To improve the quality of a weld zone by condensing and irradiating a laser beam to a base metal via a static magnetic field formed in approximately parallel with the surface of the base metal. CONSTITUTION:A notch 71 for insertion of a laser beam is provided to a magnetic core 7 and DC current is conducted to a coil wound on the core 7 to form the static magnetic field H in parallel with a weld line 9. The evaporated metallic atoms or molecule of the base metal are made into positive ions at the irradiating point O of the laser and are released in an X-axis direction but the orbit thereof is bent in the direction of the curve I. The orbit of the charge particles is similarly bent approximately orthogonal with the line 9. All the charge particles toward the incident direction of the laser beam are therefore bent in the orbit toward the outside of the beam condensing part, by which the particles forming the plasma are surely removed. The quality of the weld zone is improved by the above-mentioned method. |
