Patent ID: RE44290

Claim:
A laser-welded article comprising: an integral construction of a single laser-transmissible-absorptive molded workpiece where at least a part of a bent workpiece is overlapped, or a plurality of laser-transmissible -absorptive molded workpieces where at least a part of each workpiece is piled, the integral construction being welded by heat generated from irradiation with a laser through laser welding by melting overlapped portions of the single laser-transmissible-absorptive molded workpiece, or laser welding by melting piled portions of the plurality of laser-transmissible-absorptive molded workpieces, the laser generating rays having a wavelength ranging from 800 nm to 1600 nm, wherein the single laser-transmissible-absorptive molded workpiece or the plurality of laser-transmissible-absorptive molded workpieces have an absorbance “a” throughout the workpiece or the workpieces ranging from 0.07 to 0.8 converted into an absorbance of the molded workpiece with 1 mm thickness, and have an ability of absorbing at least a partial beam of the laser and transmitting another partial beam of the laser, the single laser-transmissible-absorptive molded workpiece or the plurality of laser-transmissible-absorptive molded workpieces including: a thermoplastic resin selected from the group consisting of polyamide resin, polycarbonate resin, polyphenylene sulfide resin, polybutylene terephthalate resin, and polypropylene resin, and a laser-transmissible absorbent of nigrosine dye, where the content of laser-transmissible absorbent ranges from 0.001 to 0.5 weight % against the thermoplastic resin.