METHOD AND APPARATUSES TO GIVE METAL COVER ON INNER AND OUTER SURFACES OF PIPES Russian patent published in 1995 - IPC

FIELD: metal surface coating. SUBSTANCE: method provides for surface preparation pipe heating, its bending and pulling through metal smelt. The last operations are carried out simultaneously, using pipe pulling through tubular canal, that has coating metal smelt. In the case a series of pipes is subjected to the treatment with discrete moving of each pipe. Pipe heating is exercised using either inductor in protecting atmosphere or in melt of fluxes with the help of electrodes up to temperature, that is over temperature of covering metal. apparatus to apply metal coatings on pipes inner and outer surfaces has transmuting mechanisms of heating and metal smelt adding means, pipes bending means feeding driving cage, tank of metal smelt, pipes discharge and dressing with cooling means, Pipe bending mean is made in the form of bent perforated pipe of corrosion resistant material and its bent part is located in tank below surface of smelt. Besides, bent perforated pipe is made in the form of helical section and heating mean as U-shaped tubular structure, to which bent perforated pipe is fixed. EFFECT: increased productivity. 6 cl, 3 dwg