METHOD OF ASSEMBLY AND WELDING OF PIPES AND DEVICE FOR ITS EMBODIMENT Russian patent published in 1999 - IPC

FIELD: manufacture of tubular articles in various branches of mechanical engineering, in particular, in boiler manufacture. SUBSTANCE: welding is carried out with welding head resting on outer surface of welded pipes in zone of measurement of their misalignment value in welded joint. In so doing, formed and introduced into memory of control device is signal of welding torch electrode axis position with respect to joint axis. Torch is rigidly fixed along joint axis in conduction of welding process without vibration of electrode or welding is carried out with vibration of electrode. Vibration amplitude value is selected depending on geometric parameters of bevelling and thickness of welded pipes. Vibration frequency is selected to be multiple of duration value of pulse of welding current application with its shift in time with cycle of one or several full periods of vibration. The device for method embodiment has welding head for argon-arc welding which has support in the form of lug coming in contact with outer surface of one of welded pipes. Support is rigidly connected with post secured in guide body regulated for pipe various diameters. Mechanism for torch vibration is made in the form of turning bar with torch and strip coming in contact with pushers of pneumatic actuators of regulated turning of strip detected by transducers of control of torch position with its fixing along joint axis. EFFECT: higher productivity and quality of process, and extended process potentialities. 2 cl, 10 dwg