FIELD: metallurgy.
SUBSTANCE: skew are made at ends in symmetry relative to peripheral end section plane that divides the pipe biller into two equal parts to make bearing sides on support and push sides. Note here that skews are located in planes making with peripheral end section plane a definite angle. Magnitude of said angle is defined by enclosed protected formula. Filler is fitted inside said pipe billet. Branch pipe is formed by pushing pipe billet through curvilinear pass with application of filler inner pressure.
EFFECT: higher quality, reduced labour input.
3 dwg, 1 ex
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