FIELD: metallurgy.
SUBSTANCE: invention relates to method for producing straight-seam tubes with butt joint which are made of used metal pipes of larger diameter by longitudinal cutting of metal strip from the entire tube length with subsequent moulding. The metal blank is produced from a tube of larger diameter. A strip of metal is longitudinally cut from the entire length of the tube. The tube is formed, and its edges are compressed on tube-forming device. In this case, a device in the form of a squeezing hydraulic rig is used, the upper and lower parts of which are provided with radial sectional inserts according to the formed diameter of the tube. Then the inner seam of the tube and the outer seam of tube are successively welded by a welding semiautomatic machine. Deformation of the tube is eliminated by hydraulic jacks on the device for inner radial straightening, in the form of ellipsoid on the device for outer radial straightening, and the chamfers are removed from the tube ends on the device for linear straightening.
EFFECT: expanded technological capabilities.
2 cl, 3 dwg
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