FIELD: metallurgy.
SUBSTANCE: pair of top and bottom pressure rollers 3, 4 is arranged to allow turning their axles 15, 16 in horizontal plane relative to straight line Y perpendicular to line X of connection part I. Pressure rollers 3, 4 are driven hardly by appropriate motors 63, 64 to roll ledge flat in connection part. Appropriate parts 3A, 4A of pressure rollers 3, 4 are directed in horizontal plane opposite the metal sheet path relative to metal material pressure rollers 3, 4 get in contact with first. Ledges in connection part are rolled flat to reduce stepped gradient so that higher joint strength is ensured.
EFFECT: higher quality of joint due to reduced strain concentration.
8 cl, 16 dwg
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