Patent ID: 7960003
Filing Date: 2011-06-14
Classification: B29C,B29K,Y10T

Abstract:
1. A laser-welded article comprising: an integral construction of a single weakly laser-absorptive molded workpiece or a plurality of weakly laser-absorptive molded workpieces, which is welded by heat generated from irradiation with a laser through laser welding by melting of butted portions of the single weakly laser-absorptive molded workpiece, or laser welding by melting of butted portions of the plurality of weakly laser-absorptive molded workpieces, where at least a part of the edge portions of the workpiece or the workpieces are butted, with no overlapping of the butted portions, the laser generating rays having a wavelength ranging from 800 nm to 1600 nm, wherein the workpiece or the workpieces have an absorbance “a” throughout the workpiece or the workpieces ranging, from 0.1 to 1.8 converted into an absorbance of the molded workpiece with 1 mm thickness, and have the ability of absorbing at least partial beam of the laser and transmitting another partial beam of the laser, the workpiece or the workpieces including: a thermoplastic resin at least selected from the group consisting of polyamide resin, polycarbonate resin, polyphenylene sulfide resin, polybutylene terephthalate resin, and polypropylene resin, and a weakly laser absorbent of nigrosine dye, where the content of the weakly laser absorbent ranges from 0.01 to 0.5 weight % against the thermoplastic resin.