GB212645A - Improvements in and relating to connecting pipes together - Google Patents

Abstract

212,645. Stenning, H. A. Dec. 14, 1922. Steam generators.-The ends of three or more pipes are connected to form a common junction piece or return bend for use in steam generators, &c., by holding said pipes at the corners of a polygon, slitting the ends thereof longitudinally for a distance, pressing outwardly portions adjacent the slits until they lie in the sides of the polygon or parallel thereto, and welding or forging such portions together to form the walls of the junction piece, the various operations being effected on all the pipes simultaneously. The pipes are held in a die formed of three sections 14, 15, 16, the sections 14, 15 being hinged at 17 in such a manner that when the section 16 is moved longitudinally.to close it into the part 15 it will operate a tail-piece 19 on the section 14 to close also the latter on the part 15. Each section is provided with an upstanding projection 27 which co-operate to form an abutment against which the floor of the junction piece is formed during forging. The projection 27 extends for a suitable distance axially of the die, the remaining part being bounded by a wall 35 shaped according to the desired shape of junction piece. The punch comprises a composite member having three punches 28, 29, 30 connected by web portions 31 and carried by a shank 32 also shaped according to the dimensions of the desired junction piece. The punch is also provided with a forging shoulder 34 which fits the wall 35 of the die by which the necessary pressure is imparted to the wall of the junction piece during forging. The open end of the junction piece may be closed by a cap or by any other method. Specification 6304/15 is referred to.