| 摘要 |
PURPOSE:To irradiate and melt surely only the ends of base metals without affecting thermally the other parts by setting two laser spots at the space conforming to the space of the butt end faces of the base metals and moving the same along a weld line. CONSTITUTION:One laser beam 2 is first split to the two laser beams 2a, 2a' by a prism 3 and the beams are further condensed by a condenser lens 4 to the micro-laser spots 2b, 2b' having high energy density. The space D between the two laser spots is set slightly wider than the max. space in the butt parts of the base metals 1 and these spots are moved along the weld line, by which the butt welding having extremely high welding accuracy is obtd. The adjustment of the space D is easily executed at proper times by changing the distance H between the prism 3 and the lens 4. |
