CREATION OF JOINTS FROM INTERMETALLIC TITANIUM ALLOYS (review)

An review of studies on the development of technologies for creating joints of intermetallic titanium alloys is presented. Today, electron beam welding is most common method for producing welded joints of this class of alloys. Brands of filler materials and solders used for intermetallic titanium alloys, as well as the properties that can be obtained when using them, are given. Approaches to the choice of welding technology that ensure the production of high-quality joints with the required characteristics are described.

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A Study of the Influence of Electron Beam Welding Defects on Fracture Processes in Titanium Alloys

Proceedings of Higher Educational Institutions Маchine Building ◽

10.18698/0536-1044-2020-3-23-34 ◽

2020 ◽

pp. 23-34

Author(s):

V.V. Grigoriev ◽

V.I. Muravyev ◽

P.V. Bakhmatov

Keyword(s):

Electron Beam ◽

Titanium Alloys ◽

Welded Joints ◽

Pore Formation ◽

Electron Beam Welding ◽

Strength Properties ◽

Technical Documentation ◽

Welding Defects ◽

Static And Dynamic Loads

The appearance of pores when welding titanium has been extensively studied by domestic and foreign researchers, but there has been no consensus on the causes and conditions of pore formation to date. An overview of advances in the studies of pore formation showed that the problem of formation of the macropores, reaching 0.1 mm was investigated by A.A. Erokhin, V.V. Frolov, G.D. Nikiforov, S.M. Gurevich, V.N. Locks, V.I. Muravyev, B.I. Dolotov, P.V. Bakhmatov et al. The advent of modern x-ray machines in the technological control of permanent joints made by electron beam welding has enabled researchers to detect a specific defect — the so-called dark bands, which make it difficult to assess the quality of permanent connections due to the absence of this defect in the normative and technical documentation. Determining the causes of specific defects and their effect on the properties of titanium alloy structures made by electron beam welding is an important task. This paper presents the results of studies investigating the effect of specific defects of electron beam welding of titanium alloys VT20, VT23 on the nature of destruction under static and dynamic loads and changes in the mechanical properties of the welded joints. It is established that specific defects occurred during electron beam welding have a significant impact on the strength properties of welded joints, as well as on the stages of their destruction. It is determined that the presence of such welding defects as lack of penetration, residual stresses and pores in the fusion zone, expulsion without bonding, etc. contribute to the formation of sub-micropores that lead to brittle destruction of welded joints. The presence of specific defects in permanent joints made by electron beam welding leads to decreased strength properties and to nearly complete absence of such characteristics as elongation and contraction. It is established that heat treatment improves the quality of welded joints.

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Design of replaceable nozzles for connecting pipelines in electron beam welding

Journal of Physics Conference Series ◽

10.1088/1742-6596/2094/4/042015 ◽

2021 ◽

Vol 2094 (4) ◽

pp. 042015

Author(s):

V S Tynchenko ◽

V A Kukartsev ◽

S G Dokshanin ◽

A V Fedorova ◽

V Slinitsyna ◽

...

Keyword(s):

Electron Beam ◽

Welded Joints ◽

Oil And Gas ◽

Electron Beam Welding ◽

Oil And Gas Industry ◽

Gas Industry ◽

Advantages And Disadvantages ◽

Welding Technology ◽

Welded Seam

Abstract The article is devoted to the use of electron beam welding for connecting pipelines in the oil and gas industry. The analysis of the proposed approach and equipment for creating permanent pipe-flange connections is carried out. The advantages and disadvantages of the proposed approach are considered. During the work, the welded seam was calculated. A set of interchangeable attachments for the turntable has also been developed. Thus, the purpose of this work is to improve the quality of welded joints of oil and gas equipment through the use of electron-beam welding technology and design of replaceable nozzles for a turntable for an electron-beam welding unit.

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Features and Application of Electron Beam Welding Technology

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1120-1121.1308 ◽

2015 ◽

Vol 1120-1121 ◽

pp. 1308-1312

Author(s):

Ming Feng Li ◽

Zheng Hong Zhu

Keyword(s):

Electron Beam ◽

Power Density ◽

High Power ◽

Electron Beam Welding ◽

High Ratio ◽

High Power Density ◽

High Quality ◽

Welding Equipment ◽

Welding Technology ◽

Wide Range

Electron beam welding technology is a mature special welding technology. The advantage of electron beam welding like these: high power density, high ratio of depth-to-width, high-quality welds. Electron beam welding equipment has been independently developed by tracking and bringing in. Electron beam welding technology has a wide range of applications in the aerospace, automotive, medical and other branches of industry, the field of applications is also expanding with the improved welding equipment. According to the demand of research and market, Electron beam welding technology will move toward the direction of universal, integrated, information-oriented in the future.

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Electron beam welding and zone heat treatment of welded joints in titanium alloys and high‐strength steels

Welding International ◽

10.1080/09507119409548664 ◽

1994 ◽

Vol 8 (8) ◽

pp. 646-648 ◽

Cited By ~ 1

Author(s):

Yu T Lysenkov ◽

A V Gerasimenko ◽

E M Feoktistova ◽

O N Sankov ◽

A N Svechin ◽

...

Keyword(s):

Heat Treatment ◽

Electron Beam ◽

Titanium Alloys ◽

Welded Joints ◽

Electron Beam Welding ◽

High Strength Steels ◽

High Strength

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

VESTNIK of the Samara State Aerospace University ◽

10.18287/2541-7533-2019-18-4-157-168 ◽

2020 ◽

Vol 18 (4) ◽

pp. 157-168

Author(s):

V. I. Muravyev ◽

P. V. Bakhmatov ◽

V. V. Grigorev ◽

O. G. Shakirova ◽

S. A. Iskhakov

Keyword(s):

Electron Beam ◽

Titanium Alloys ◽

Welded Joints ◽

Arc Welding ◽

Electron Beam Welding ◽

Low Voltage ◽

Pulse Discharge ◽

Hydrogen Distribution ◽

Temperature Conditions ◽

Edge Surface

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.

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