| 摘要 |
PURPOSE: To provide a method for butt welding a thermoplastic resin tube material having high reliability of connecting strength. CONSTITUTION: Tube end faces 11a, 12a of a connecting tube material are formed in a shape inclined from the outer peripheral edge toward the inside in the inward direction of the tube. Thus, the boundary SA of a molten part WA generated at the tube end of the material and a non-molten part is but welded in the state of perpendicularly crossed with the axial direction of the material by heating of heater without contact, thereby uniformly applying a connecting load to the connecting surface. |
