METHOD OF UNIT CONNECTION "PIPE - TUBE GRILL" WITH WELDED FRICTION Russian patent published in 2017 - IPC B23K20/12 B23K101/06 

FIELD: machine engineering.

SUBSTANCE: invention can be used for the production of friction welding pipe-tube connection, for example, in the manufacture of heat exchangers. On the welded ends of the pipe and pipe grid, a washer is installed, the inner diameter of which is equal to the pipe cross-section, its outer surface has a conical and cylindrical parts, and the pipe edges and tube-hole holes have internal tapered surfaces with a bevel angle corresponding to the bevel angle of the conical surface of the washer. Rotate the washer with the pressing force and the subsequent forging force after stopping its rotation. A peculiarity of the method of joining the pipe-tube assembly is the cavity of the specified dimensions obtained by additional boring of the hole in the tube grid. Such cavity provides in the process of welding by friction extrusion of the heated metal (grate) and removal of surface contaminants in it both from the outer surface of the pipe and from the frictionless conical surfaces of the tube grid and washer.

EFFECT: due to the prevention of contamination in the weld seam, the quality is improved.

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