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Erschienen in: Metallurgist 9-10/2015

01.01.2015

Modeling Heating Effects in the Heat-Affected Zone of High-Strength Pipe Steel K70 with Double-Pass Submerged Arc Welding

verfasst von: A. A. Kruglova, V. V. Orlov, D. M. Sharapova

Erschienen in: Metallurgist | Ausgabe 9-10/2015

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Abstract

Simulation modeling is used in order to study metal structure in a heat-affected zone (HAZ) during submerged-arc welding. A correlation is established between low values of impact energy observed and features of HAZ structure formation during submerged-arc welding of low-alloy steel of strength category K70. It is shown that the appearance of brittle precipitates with an increase in content of the main alloying elements at large grain boundaries is a reason for low impact energy in the area of large HAZ grains during steel K70 welding. Development of these areas is connected with repeated heating (simulating a second pass during rolling) in a temperature range somewhat lower than the Ac 1 point. A reduction in cooling rate in the first heating cycle (which corresponds to an increase in linear energy during welding) facilitates precipitate enlargement over grain boundaries. Multipass welding and a reduction in pass linear energy are recommended in order to exclude the formation of these areas and to improve and stabilize impact energy in a welded joint HAZ.

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Metadaten
Titel
Modeling Heating Effects in the Heat-Affected Zone of High-Strength Pipe Steel K70 with Double-Pass Submerged Arc Welding
verfasst von
A. A. Kruglova
V. V. Orlov
D. M. Sharapova
Publikationsdatum
01.01.2015
Verlag
Springer US
Erschienen in
Metallurgist / Ausgabe 9-10/2015
Print ISSN: 0026-0894
Elektronische ISSN: 1573-8892
DOI
https://doi.org/10.1007/s11015-015-9999-2

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