FIELD: ultrasonic seam welding. SUBSTANCE: device has means to form continuous metal strip into U-shaped section, form-shaping bushing for coiling the strip into pipe with overlapping seam edge, mandrel arranged inside form-shaping bushing, position sleeve, ultrasonic welding roller with drive providing rotation of roller at speed equal to pipe displacement speed, and devices for extruding the plastics on pipe surface. EFFECT: improved quality and reliability. 2 cl, 1 dwg
Authors
Dates
1997-04-10—Published
1989-08-02—Filed