METHOD OF PRODUCING A SEALING-TIGHT JOINT BETWEEN TWO TUBES ON DIFFERENT MATERIALS

摘要

A method of producing a sealing tight joint between two tubes one of which has a greater wall thickness than the other. The thinner tube has a collar formed on it which will engage a circumferential groove in the end of the thicker tube when placed in end-to-end relationship. A ring shaped to conform with the collar is placed inside it. A sleeve is slid over the two tubes, this sleeve having an inwardly extending flange which engages the ring and holds it and the collar against the end of the thicker tube. After welding the collar in place, the thicker tube is worked so as to expand it axially so that the grooved end tightly engages the collar.