Abstract:
PROBLEM TO BE SOLVED: To mutually bond resin materials low in compatibility while utilizing the irradiation with laser beam. SOLUTION: A first resin member 11 comprises a transmission resin material having transmissivity to laser beam being a heating source and a second resin member 12 comprises a non-transmission resin material having no transmissivity to laser beam. An alloy resin material 13 consists of a first resin material constituting the first resin member 11 and a second resin material constituting the second resin member 12 and the first and second resin materials are mutually low in compatibility. In such a state that the alloy resin material 13 is arranged between the first and second resin members 11 and 12, the alloy resin material 13 is irradiated with laser beam on the side of the first resin member 11 comprising the transmission resin material to integrally bond the first and second resin members 11 and 12 mutually low in compatibility through the alloy resin material by laser welding while heating and melting the whole of the alloy resin material 13.
Abstract:
PROBLEM TO BE SOLVED: To eliminate such a problem that the strength of the welded or bonded part of a resin molded article lowers. SOLUTION: The welded part 2 formed by the solidification of the mutual collision parts of molten resins is irradiated with laser beam being a heating source to be melted by the internal generation of heat due to the laser beam to enhance the strength of the welded part. The lowering of tensile strength caused by the molecular orientation or the fiber orientation of reinforcing fibers is generated in the welded part 2. The molecular orientation of the resin or the like is eliminated by melting the welded part 2 by laser irradiation to achieve the enhancement of the strength of the welded part 2.