On the Physical Nature of Formation of the ‘Dead Spots' Type Defects in the Case of Contact Welding of Main Pipelines from Hypopearlitic Steels by S. I. Gubenko, S. I. Zhuravljov, N. A. Konovalov, D. A. Lobus, S. P. Oshkadjorov, S. I. Poloskov, A. N. Terenin

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