2018 №10 (04) DOI of Article
2018 №10 (06)

Automatic Welding 2018 #10
Avtomaticheskaya Svarka (Automatic Welding), #10, 2018, с. 32-39

Influence of activators on the quality of spirally-welded pipes, produced with aplication of high-frequency currents

V.V. Polykhin, A.S. Prokofyev, D.V. Romashko, S.V. Rymar, R.S. Gubatyuk

E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazimir Malevich Str., 03150, Kyiv. E-mail: office@paton.kiev.ua

The paper deals with development of the technology of high-frequency welding in manufacture of thin-walled spirally-welded pipes by adding activators to the weld zone and pressure application to improve the strength characteristics of welded joint metal. Investigations are based on scientific principles of theoretical fundamentals of welding, materials science and problems of metal strength. A feature of the considered welding technology is the fact that during heating of the edges to be joined by high frequency currents the activators, having lower melting temperatures, go into the liquid state, bind surface contamination and transport it to the surface at pressure application. Edges of the cleaned metal are joined as a result of running of diffusion processes at temperatures close to base metal melting temperatures. Essentially, the process of joining at the final stage proceeds with the weld metal being in the solid phase. Obtained weld width is not greater than 4 – 8 ~m. Weld metal consists of the base metal being welded, enriched in activator elements. Near-weld zone structure is close to that of the base metal. Thin-walled spirally-welded pipes can be produced with a high quality of welded joint at a high welding speed. 21 Ref., 3 Tabl., 5 Fig.
Keywords: thin-walled spirally-welded pipes, high-frequency current, pressure application, activators

Received: 11.09.2018
Published: 25.10.2018

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