MANUFACTURE OF DISSIMILAR METALLIC PIPE JOINT

摘要

PURPOSE:To efficiently manufacture the title dissimilar metallic pipe joint with different inside and outside dia. by enlarging or reducing the dia. of a double clad pipe from a pipe end to the optional position and forming the double clad pipe with the different dia. and cutting and removing inner layer material of the small dia. part side and outer layer material of the large dia. part side, etc., of the pipe. CONSTITUTION:The double clad pipe and a double clad rod are cut out to the prescribed length and the dias. thereof are enlarged or reduced from one ends up to the optional positions thereof. In dia. enlarging work, in case of the double clad pipe 3, a plug 4 is inserted into the inner layer material 1 and the outer layer material 2 and pushed-in up to the middle thereof. In case of the double clad rod, a wedge-shaped plug is pushed-in up to the middle thereof. In dia. reducing work, the double clad pipe 3 is pushed in a die 5 up to the middle thereof. The prescribed parts of the inner layer material and the outer layer material are then machined and removed and the straight pipe type dissimilar metallic pipe joint consisting of the inner layer material at the one end side and the outer layer material at the other end side and having the same inside and outside dia. extending over the joint entire length or the different dia. type dissimilar metallic pipe joint having the different inside and outside dia. from the joint central part is formed. By this method, the dissimilar metallic pipe joint is manufactured efficiently.