FIELD: process engineering.
SUBSTANCE: invention relates to pressure shaping, particularly, to fixing tubes in tube plates of heat exchangers. Profiled tips with rings are produced on tube ends that feature trapezoidal section. Proposed tip is arranged in tube plate opening made with two rectangular section grooves. Rings are arranged opposite circular grooves. Tube is locked and tip is fixed in tube opening. Cylindrical recess is produced in fixed tip. Inner space of fixed tip is degreased and sleeve from antirust composition is fitted in said recess. Sleeve has internal bulge with it diameter smaller than tube initial ID, and outer taper section. Sleeve end face is arranged in tip end face plane. Sleeve is tack-welded in said space by argon arc welding. Now, sleeve is fixed by expanding its end face as required.
EFFECT: higher strength, density and antirust properties of tube-to-tube plate joint.
8 dwg
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