FIELD: metallurgy, namely processes for making tubes, for example metal-polymer tubes by ultrasonic welding.
SUBSTANCE: method comprises steps of forming continuous metal strip to U-shaped profile blank; twisting U-shaped profile blank to tubular one with overlapping edges at moving tubular blank along its lengthwise axis; welding overlapped edges of tubular blank by means of roller rotating in motion direction of tubular blank and subjected to ultrasonic oscillations along its rotation axis; extruding polymeric material onto surface of welded tube. Welding is realized at roller rotation speed Vr exceeding speed Vt of tubular blank motion. Value Vr is selected in range Vr = (1.1 - 1.4)Vt. Pressing effort Fpr of roller to tubular blank is selected in range 4 - 8 kg.
EFFECT: enhanced quality and operational characteristics of metal-polymer tubes.
4 dwg, 9 ex
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