METHOD FOR WELDING CONTACT POINT MATERIAL

摘要

PURPOSE:To obtain a weld zone in a deeply penetrated state with high reliability by forming a recessed part on the rear surface of a contact point material, forming a through hole on a metallic sheet corresponding thereto and irradiating to recessed part with a laser beam from the through hole. CONSTITUTION:The recessed part 2 having the curved surface on its inside peripheral surface is formed on the rear surface of the contact point material 1 such as Ag and a projection 3 is formed on the center of the recessed part 2. The through hole 5 corresponding to the projection 3 of the above-mentioned recessed part 2 is provided on the metallic sheet 4 such as a Cu sheet. The recessed part 2 is irradiated with the laser beam 6 via the through hole 5 from the vertical direction of the lower part. The laser beam 6 spreads around while repeating multiple reflection between the inside peripheral surface of the recessed part 2 and the metallic sheet 4 and confined in a gap formed between these. As a result, even if the metallic sheet 4 or the contact point material 1 has high reflectivity with respect to the laser beam 6, heat required for welding is stored therein effectively. Accordingly, the metallic sheet 4 and the contact point material 1 are welded integrally by welding heat at this time.