FIELD: manufacture of high-strength laminate metallic tubes with layers of easy-to-melt metals.
SUBSTANCE: method comprises steps of feeding steel blank from heating chamber after hot rolling under pressure cylinders; winding on format drum sheet of easy-to-melt metal whose length exceeds that of hot steel sheet for forming inner protection layer of tube shell; applying onto steel sheet easy-to-melt metal sheet at temperature of steel sheet less than melting temperature of easy-to-melt metal; performing hot deforming at combined shaping by means of pressure of press-rollers for producing bimetallic strips; feeding bimetallic strips under pressure rollers of format drum for their further winding in order to produce tube shell with predetermined thickness of wall; winding on format drum easy-to-melt metal sheet with length exceeding that of all bimetallic strips for forming outer protection layer of tube shell; welding bimetallic strips one with other and with inner and outer protection layers for producing ready tube shells with use of pressure rollers on format drum rotating at melting temperature of easy-to-melt metal; joining produced shells to tube; performing said welding procedures during five revolutions of format drum. Shells are joined to tube with use of inner and outer annular welding and further final abutting due to welding steel annular members at side of outer surface of shells and butt welding by means of steel electrodes. Then easy-to-melt metal is surfaced onto welded seam.
EFFECT: enhanced strength and density of metallic tubes with non-exfoliating layers without macro-cracking and ruptures of welded joints caused by change of temperature of environment.
2 dwg
