FIELD: manufacture of electrically welded straight-seam tubes, namely small-diameter steel water- and gas-supply tubes welded with use of high-frequency electric current.
SUBSTANCE: method comprises steps of shaping from band tubular blank in the form of oval cylinder with slit having small axis equal to diameter of next cylindrical welding gage; heating edges and welding them at squeezing in welding gage. Blank is shaped until making symmetrical portions with radiuses equal to radius of welding gage. Centers of said portions are laid on large axis of oval cylinder. Ratio of large axis of oval cylinder to its small axis is in range 1.03 - 1.30.
EFFECT: stability of edges during welding process, enhanced contour of welded tube.
1 tbl, 1 dwg
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|---|---|---|---|
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