Welding pipe ends together, first inserts tight-fitting sleeves, making them flush with pipe ends

摘要

Before heating the pipe- or hose ends to be welded (1, 2), a sleeve (3, 4) of higher melting material is inserted into each, until it is flush with the end. Each sleeve contacts the inner walls. Resistance and holding force arise mainly at the leading end of each sleeve, during insertion. The leading end of the sleeve has a larger diameter; and diameter decreases continuously towards the rear end. There is alternatively a ring bead at the leading end. This end is radially-resilient. A longitudinal slot (6) appears there. The leading edge is angled with respect to the longitudinal axis. The sleeve contact surface is roughened. The annular weld bead formed during joining, is cut away from the tube material using annular blades; it is divided into annular segments by longitudinally-running blades.