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2019 №09 (08) DOI of Article
10.15407/as2019.09.09 		2019 №09 (01)

Automatic Welding 2019 №09


Avtomaticheskaya Svarka (Automatic Welding), #9, 2019, pp. 62-70

Drives of mechanisms of automatic machines for orbital tig welding of metal pipeline joints in NPP power units

N.M. Makhlin, V.Yu. Buriak


SE «SEC of Welding and Control in the Field of Nuclear Energy of Ukraine of E.O. Paton Electric Welding Institute of the NAS of Ukraine». 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: electro@paton.kiev.ua

Electric drives are integral devices of any welding installations for arc and plasma welding. Since the accuracy and reliability of the actuating mechanisms in modern automatic machines for orbital welding of stationary joints of pipelines in NPP units present a number of specific requirements, these requirements are also imposed on the mechanisms for their driving, which required the development of the latter. The schemes of unified reversible DC drives of actuating mechanisms in modern automatic machines for orbital welding of stationary pipe joints in NPP are described. A transistor drive with feedback from an optical speed sensor, characterized by high reliability, ability to accurately pre-set (program) the rotation speed of the motor shaft, absence of mechanical switching contacts for starting or stopping, or for reversing, as well as a high-precision automatic arc voltage control device was designed. The results of industrial operation of some orbital welding machines, designed at the Scientific and engineering center of welding and control in the field of nuclear energy, are given, which use the described reversing drives and the device for automatic arc voltage control. The aim of this work is to present the results of the works carried out at the Scientific and engineering center of welding and control in the field of nuclear energy in the direction of creating components of automatic machines for orbital welding of stationary joints in thin-walled pipelines of austenitic, pearlitic and carbon steels and non-ferrous metal alloys (except aluminum and its alloys). 12 Ref., 8 Fig.
Keywords: arc orbital welding, non-consumable electrode, inert gases, drive, direct current electric motor, opto electrical speed sensor, transistor regulator

Received: 14.06.2019

References


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