METHOD AND APPARATUS FOR MUTUALLY WELDING TUBULAR MEMBERS MADE OF SYNTHETIC RESIN

PROBLEM TO BE SOLVED: To prevent the butt end faces of a tube and a joint from being staggered when the tube made of a synthetic resin and the joint made of a synthetic resin different in characteristics are welded. SOLUTION: A pair of clamp members 1 and 2 at a welding position are positioned symmetrically about the position of an end face heater 3 present at a heating position. Individual bushings 6 and 7 are attached to the corresponding clamp members 1 and 2 so that the distances X1 and X2 from the end face positions thereof to the end face positions of the clamp members 1 and 2 are different. The distance X2 from the support position of the joint made of the synthetic resin relatively larger in melt flow rate to the butt end face position is made less than the distance X1 from the support position of the tube 7 made of the synthetic resin relatively small in melt flow rate to the butt end face. COPYRIGHT: (C)2007,JPO&INPIT