FIELD: metallurgy, namely tube manufacture by ultrasonic welding, for example making metal-polymer tubes.
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 direction of tubular blank motion and subjected to ultrasonic oscillations along its rotation axis; extruding polymeric material onto surface of welded tube. Welding is realized at motion speed Vt of tubular blank exceeding speed Vr of roller rotation. Value Vt is selected in range Vt =(1.05 - 2.0)Vr; pressing effort Fpr of roller to tubular blank is provided in range 3 - 6 kg.
EFFECT: enhanced quality and operational characteristics of metal-polymer tubes.
4 dwg, 9 ex
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