Issues »  Volume 36, Issue 5

On the Physical Nature of Formation of the ‘Dead Spots’ Type Defects in the Case of Contact Welding of Main Pipelines from Hypopearlitic Steels

S. I. Gubenko$^{1}$, S. I. Zhuravlyov$^{2}$, N. A. Konovalov$^{2}$, D. A. Lobus$^{2}$, S. P. Oshkadyorov$^{3}$, S. I. Poloskov$^{4}$, A. N. Terenin$^{1}$

$^{1}$National Metallurgical Academy of Ukraine, 4 Gagarin Ave., 49600 Dnipropetrovs’k, Ukraine
$^{2}$CJSC 'Pskovelectrosvar', 3 Innovators Str., 180022 Pskov, Russia
$^{3}$G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03680 Kyiv-142, Ukraine
$^{4}$Bauman Moscow State Technical University, 5/1 2-nd Baumanskaya Str., 105005, Moscow, Russia

Received: 11.02.2014. Download: PDF

Formation of the defects such as ‘dead spots’ in the case of contact welding of main pipelines based on hypopearlitic steels is explained by the features of changes in morphology of virgin metal under nonequilibrium transformations compounded with compressive loads during heating and tensile loads during cooling in the areas of heat-effected zones at high-temperature gradients with regards for effect of grain-boundary segregations and kind of non-metallic inclusions. General criteria and optimal characteristics of the phase and structural transformations at contact welding without washing edges and contact welding with washing edges are considered.

Key words: hypopearlitic steels, contact welding, grain-boundary segregation.

URL: http://mfint.imp.kiev.ua/en/abstract/v36/i05/0661.html

DOI: https://doi.org/10.15407/mfint.36.05.0661

PACS: 61.72.Ff, 61.72.Mm, 61.72.Qq, 62.20.M-, 64.75.Op, 81.20.Vj, 81.40.Np

Citation: S. I. Gubenko, S. I. Zhuravlyov, N. A. Konovalov, D. A. Lobus, S. P. Oshkadyorov, S. I. Poloskov, and A. N. Terenin, On the Physical Nature of Formation of the ‘Dead Spots’ Type Defects in the Case of Contact Welding of Main Pipelines from Hypopearlitic Steels, Metallofiz. Noveishie Tekhnol., 36, No. 5: 661—688 (2014) (in Russian)

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