FIELD: metallurgy.
SUBSTANCE: method includes following operations: welded pipe manufacturing, and its expansion through full length using pipe expansion head such, that ratio D = p/λ is 0.8 maximum or at least 1.8, where p is wave length of undulation in axial direction of welded steel pipe, and λ is wave length of buckling as per Timoshenko, determined by equation λ = 3.44×(r×t)1/2, where r is internal radius of welded steel pipe, and t is wall thickness of welded steel pipe.
EFFECT: possibility to increase critical bend stress of pipe.
3 cl, 10 dwg
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