WELDING MACHINE FOR NONREVOLVING JOINTS OF PIPES Russian patent published in 1995 - IPC

FIELD: welding engineering. SUBSTANCE: welding machine has fixed case that centers pipes 2 and accommodates moving case 3 mounted for rotation and axial displacement. Moving case 3 has welding torch 6 with electrode 9, transverse electrode motion drive 8, and arc length tracing drive 7. Drive 8 has geared motor, screw pair and connecting rod 24 hinged to one of rockers 21. The latter are joined by hinges 22 to moving case 3 and carry guides 19 joined to them by means of hinges 20. Guides 19 mount carriage 18 which has torch 6 with electrode 9 secured on it. Arc length tracing drive 7 has motor 10, screw pair 11, 12, rod 13 fixed to nut 12, connecting rod 15, angle lever 16, and other link 17. EFFECT: improved quality of joint in welding very thick pipes due to provision for desired path of displacement of working tip of electrode in respect to groove face. 2 cl, 4 dwg