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2018 №10 (04) DOI of Article
10.15407/tpwj2018.10.05 		2018 №10 (06)

The Paton Welding Journal 2018 №10


The Paton Welding Journal, 2018, #10, 26-32 pages
 

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

V.V. Polukhin, A.S. Prokofiev, D.V. Romashko, S.V. Rymar and R.S. Gubatyuk


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

The paper deals with development of the high-frequency welding technology in manufacture of thin-walled spirally-welded pipes by adding activators to the weld zone and applying the pressure 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 specifics of the welding technology considered is the fact that during heating of edges to be joined by high frequency currents the activators, having lower melting temperatures, transition to the liquid state, bind surface contaminations and transport them to the surface at pressure applying. Edges of the cleaned metal are joined as a result of running of diffusion processes at temperatures close to base metal melting temperatures. In principle, the process of joining at the final stage proceeds with the weld metal being in the solid phase. The obtained weld width does not exceed 4–8 μm. 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 Tables, 5 Figures.
Keywords: thin-walled spirally-welded pipes, welding, high-frequency current, pressure application, activators
 
Received:                11.09.18
Published:               18.12.18
 
 
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