FIELD: metallurgy.
SUBSTANCE: shaped ends are made on tubes which have annular ledge and inner and outer gaged sections arranged on both sides on said ledge. Tube end is fitted in tube opening with inner and outer annular grooves and inner cylindrical shoulder. Inner annular groove cross-section is shaped to triangle. Tube end is secured in tube opening, in outer annular groove, and prefixed therein. Then, it is fixed completely with making power element in outer annular groove and barrier protection in inner groove.
EFFECT: controlled straining in tube fixation.
7 dwg, 1 ex
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