JPS54112762A - Jointing method for metallic pipes - Google Patents

Abstract

PURPOSE:To make easy the friction welding without necessity of shrinking mechanism for the ring diameter like as the conventional method, at the friction welding of thin walled metallic pipes, by revolving the ring, in which the inside of both end faces are chamfered at the same angle, between the fixed two pipes whose end faces are both cahmfered. CONSTITUTION:Two metallic pipes 1, 1', whose end faces are both chamfered, are respectively held by chucks 2, 2'; a ring 3 being chamfered at the same angle as pipes 1, 1', is arranged on the chamfered outer circumference of pipes 1, 1'; and this ring 3 is revolved at a fast speed. A core metal 4, whose outside diameter is a little smaller than the inside diameter of the pipe, is inserted into pipes 1, 1'. Under this condition, pipes 1, 1', are moved together with chucks 2, 2', face to face, so as to thrust the revolving ring 3; as a result, materials are molten due to the friction heat. At this moment, the ring 3 is suddenly stopped, and the thrusting is continued unitl the temperature goes down; hereby, a jointed pipe is obtained. The core metal 4 is to prevent the burr generated while thrusting continues; however, a high strength insulating material is desirable for core metal 4 for preventing the radiation of the friction heat.