LASER FUSING METHOD FOR RESIN PARTS

摘要

PROBLEM TO BE SOLVED: To obtain a sufficient joining strength without using a pressure fixture even if a gap is present between joining end surfaces. SOLUTION: The laser fusing method consists of an arranging process for opposing the mutual end surfaces of the joining end 10 of pervious resin material 1 pervious to a laser beam and the joining end 20 of an absorbable resin material 2 having absorbability with respect to a laser beam to each other and an irradiation process for heating and melting the mutual joining end surfaces of the pervious resin material 1 and the absorbable resin material 2 by irradiation with a laser beam from the pervious resin material 1 to integrally join them. In the irradiation process, at least one end of the joining end surface (interior of a hollow body) among both joining end surfaces is irradiated with a laser beam in a reduced pressure atmosphere to allow the molten resin of the joining end surface of the absorbable resin material 2 to flow toward the reduced pressure atmosphere to fill the gap between the joining end surfaces with the molten resin.