| 摘要 |
PURPOSE:To form a weld surface, the quality of which is good and the weld strength of which is large, by a method wherein heat generating bodies are formed according to the shape of a molded item and at the same time each heat generating surface, which faces to each joint surface of the molded item, is made flat so as to heat the joint surface under the condition that the heat generating body is separated from the joint surface. CONSTITUTION:Molded items A1 and A2, which are respectively fitted to retaining holes 1a and 2a of bearing jigs 1 and 2, are arranged so as to face the joint surfaces B1 and B2 of the molded items A1 and A2 opposite to each other. Heat generating bodies 10, which are mounted above and below a supporting truck 3 through boards 15, are heated up to the predetermined temperature. The supporting truck 3, which supports the heat generating bodies 10, is inserted between the bearing jigs 1 and 2 and shifted in the direction, in which the bearing jigs 1 and 2 are faced to each other, so as to bring the joint surfaces B1 and B2 of the molded items A1 and A2 close to the heat generating bodies 10. The joint surfaces B1 and B2 melt by the heat radiation emitted from heat generating bodies 10c and internally heated by the infrared rays radiated from the heat generating bodies 10. The molded items A1 and A2 are parted from the heat generating bodies 10 and the supporting truck 3 is drawn out of the place and, after that, the joint surfaces B1 and B2 are butted against each other by shifting the bearing jigs 1 and 2 in the direction opposing to each other, resulting in thermowelding the two molded items A1 and A2 together. |
