The problems of weldability of heat-hardened rails of modern production using the flash-butt welding method, development of technologies and equipment for their joining have been investigated using rail steel types M76, K76T, E76F and U75V. The primary reason for investigations was the decrease in bending strength of welding seams. It was shown that some uncontrollable impurities in rail steels degrade their weldability through creating oxide layers by oxidizing titanium or vanadium as alloying additions, and by increasing the ferrite content and decarbonification of steel by oxygen dissolved in melted metal during welding. The new technology and equipment for resistant flash-butt welding with pulsed flushing of heat-hardened rails have been developed, providing the welded joints with mechanical properties within required standards.
Technologia a zariadenia na odtavovacie stykove zvaranie kolajnic z vysokopevnych oceli
Technologie und Ausrüstung für Abbrennstumpfschweißen von Eisenbahnschienen aus hochfestem Stahl
Technology and equipment for flash-butt welding of high-strength rails
Zvaranie Svarovani. Odborny Casopis so Zameranim na Zvaranie a Pribuzne Technologie ; 57 , 11/12 ; 321-329
2008
9 Seiten, 11 Bilder, 6 Tabellen, 8 Quellen
Aufsatz (Zeitschrift)
Slovakisch
Abbrennstumpfschweißen , Ausrüstung (Ausstattung) , Biegefestigkeit , Einschluss , Eisenbahnschiene , experimentelle Untersuchung , gehärteter Stahl , hochfester Stahl , Materialzusammensetzung , Methodenentwicklung , Oxidschichtbildung , Schweißbarkeit , Schweißeignung , Schweißnaht , Schweißtechnologie , Verfahrensoptimierung , Verunreinigung , Widerstandsschmelzschweißen
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