LASER WELDING METHODS, METHOD OF MANUFACTURING A WELDED BODY, METHOD OF MANUFACTURING ELECTRODE FOR SPARK PLUG, AND METHOD OF MANUFACTURING SPARK PLUG BASED ON SUCH LASER WELDING METHODS

• Main Authors: OHARA, Honami, YAMAMOTO, Hiroki
• Format: Patent
• Language: English; French; German
• Published: 12.12.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CLADDING OR PLATING BY SOLDERING OR WELDING; CORONA DEVICES; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; ELECTRICITY; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; OVERVOLTAGE ARRESTERS USING SPARK GAPS; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; SPARK GAPS; SPARKING PLUGS; TRANSPORTING; WELDING; WORKING BY LASER BEAM

The present application relates to laser welding methods, wherein an irradiation with a laser beam is started at a welding start position of two members that are stacked together, and the output of the laser beam is set so that spatter is not generated. After the start of the irradiation, the output of the laser beam is gradually increased so that a penetration depth from an irradiated edge to a deeper location between abutting surfaces of the two members falls within a predetermined penetration depth range while the laser beam is not moved. After the output of the laser beam is gradually increased, the laser beam is moved toward a welding end position so that the penetration depth is maintained within the penetration depth range.