| abstract |
A method of manufacturing laser-welded article having an integral construction of piled workpieces, that are welded by heat generated from irradiation with laser and include thermoplastic resin, a laser-transmissible-absorptive molded workpiece including a thermoplastic resin and 0.001 to 0.3 weight % of colorant consisting of nigrosine which has an absorption coefficient: ε for a ray of 940 nm ranging form 4000 to 7000, that transmits laser partially and absorbs laser partially, and a laser-absorptive molded workpiece including a thermoplastic resin and 0.1 to 5 weight % of diverse colorant comprising nigrosine and/or carbon black, that absorbs the laser. |