Automatic Welding, 2019, №12



2019 №12 (04)

DOI of Article 10.15407/as2019.12.05

2019 №12 (06)

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Avtomaticheskaya Svarka (Automatic Welding), #12, 2019, pp.41-51

Mechanisms of heads of automatic welding machines for orbital welding of pipelines of NPP power units

L.M. Lobanov¹, N.M. Makhlin², V.E. Vodolazsky², V.E. Popov², D.S. Oliyanenko²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
²SE «Scientific and engineering centre 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 Kazymyr Malevich Str., 03150, Kyiv, Ukraine. E-mail: electro@paton.kyiv.ua

To the accuracy and reliability of actuating mechanisms of modern automatic machines for orbital (GTAW) welding of stationary butts of pipelines of NPP power units a number of specific requirements is specified. In particular, they concern the largest diameters of faceplates of welding heads of such automatic machines, in which, as a rule, all or the most of those mechanisms are located. This paper describes the designs of actuating mechanisms of modern automatic machines for GTAW of stationary butts of NPP pipelines, designed at the Scientific and engineering centre of welding and control in the field of nuclear energy. The mechanisms of clamping (fixation) of welding heads on the pipe being welded, the mechanism for stabilizing the arc length, the mechanism for rotation (rotator) of the faceplate around the axis of the pipes to be welded, the mechanism for automatic regulation of arc voltage, the mechanism for oscillation of non-consumable electrode (across the weld) and the mechanism of filler wire feed were developed. The results of industrial operation of some automatic machines for GTAW, designed at the Scientific and engineering centre of welding and control in the field of nuclear energy, are presented, in which the described mechanisms are used. The aim of this work is to present the results of works carried out at the Scientific and engineering centre of welding and control in the field of nuclear energy in the direction of creating components of automatic machines for GTAW of stationary butts of thin-walled pipelines of steels from austenitic, pearlite classes, carbon steels and alloys of non-ferrous metals (except aluminum and its alloys). 11 Ref., 2 Tabl., 6 Fig.
Keywords: automatic orbital arc welding, non-consumable electrode, inert gases, welding head, faceplate, actuating mechanisms, faceplate rotator, non-consumable electrode oscillator, filler wire

Received: 05.08.2019
Published: 17.12.2019.

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