Research of the influence of electron beam welding of titanium alloys on hydrogen distribution in the weld


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Abstract

The paper presents the results of analyzing distribution of hydrogen in welded joints obtained by electron beam welding of titanium alloys VT20 and VT23. The distribution of hydrogen in the cross section of welded joints was measured in the area of the weld, in the heat-affected zone and in the base metal by means of spectral analysis using low-voltage pulse discharge on the spectrograph ISP-51. It was established that hydrogen peaks in fixed joints obtained by electron beam welding, unlike argon arc welding, are located not only in the heat-affected area, but also in the сentral part of the welded joint. Chemical analysis of fractures of fixed joints investigated with the aid of a scanning electron microscope Hitachi S-3400N showed that the pores in the welded joints made by electron beam welding occur due to the desorption of capillary-condensed contaminants located in the defects of the edge surface into the melt and due to selective grain boundary fusion because of insufficient temperature conditions of whole grain melting. It was found that emerging variations in hydrogen content, with formation of defects, are influenced by the temperature conditions of heating of the welded edges, the welding rate and the thickness of welded blanks.

About the authors

V. I. Muravyev

Komsomolsk-on-Amur State University

Author for correspondence.
Email: vmuravyev@mail.ru

Doctor of Science (Engineering),
Consulting Professor, Department of Mechanical Engineering and Metallurgy

Russian Federation

P. V. Bakhmatov

Komsomolsk-on-Amur State University

Email: mim@knastu.ru

Candidate of Science (Engineering), Associate Professor,
Head of the Department of Mechanical Engineering and Metallurgy

Russian Federation

V. V. Grigorev

Komsomolsk-on-Amur State University

Email: grigorev.vlv@gmail.com

Leading Engineer, Department of Mechanical Engineering and Metallurgy

Russian Federation

O. G. Shakirova

Komsomolsk-on-Amur State University

Email: tpnp@knastu.ru

Doctor of Science (Engineering), Associate Professor,
Head of the Department of Oil and Polymer Processing Technology

Russian Federation

S. A. Iskhakov

Branch of Public Joint Stock Company “Aviation Holding Company “Sukhoi” Komsomolsk-on-Amur Aircraft Plant named after Y.A. Gagarin

Email: mim@knastu.ru

Head of the Spectral Laboratory

Russian Federation

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