The Paton Welding Journal, 2019, №12



2019 №12 (04)

DOI of Article 10.15407/tpwj2019.12.05

2019 №12 (06)

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The Paton Welding Journal, 2019, #12, 37-47 pages
 
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #12, 2019 (December)
Pages 37-47

Modernization of heads of automatic welding machines for orbital tig-welding of pipelines of NPP power units

L.M. Lobanov¹, N.M. Makhlin², V.E. VOdolazsky², V.E. Popov² and D.S. Oliyanenko²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
²SE «Scientific and engineering center 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 Malevych 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 position joints of pipelines of NPP power units a number of specific requirements is made. 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 position joints of NPP pipelines, designed at the Scientific and engineering center of welding and control in the field of nuclear energy. Designed were the mechanisms of clamping (fixation) of welding heads on a pipe being welded, the mechanism for arc length stabilization, the mechanism for rotation (rotator) of faceplate around the axis of pipes to be welded, the mechanism for automatic regulation of arc voltage, the mechanism for oscillation of nonconsumable electrode (across the weld) and the mechanism for filler wire feed. The results of industrial operation of some automatic machines for GTAW, designed at the Scientific and engineering center 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 center of welding and control in the field of nuclear energy in the direction of creating components of automatic machines for GTAW of position joints of thin-walled pipelines of steels from austenite, pearlite classes, carbon steels and alloys of nonferrous metals (except aluminum and its alloys). 11 Ref., 2 Tables, 6 Figures.
Keywords: automatic orbital arc welding, nonconsumable electrode, inert gases, welding head, faceplate, actuating mechanisms, faceplate rotator, nonconsumable electrode oscillator, filler wire

 
Received: 05.08.19
Published: 30.01.19
 
 

References

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