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

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.

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

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.

CREATION OF JOINTS FROM INTERMETALLIC TITANIUM ALLOYS (review)

2021 ◽  
pp. 31-38
Author(s):  
A.A. Skupov ◽  
◽  
A.V. Sviridov ◽  
E.A. Khodakova ◽  
A.N. Afanasev-Khodykin ◽  
...  
Keyword(s):  
Electron Beam ◽  
Titanium Alloys ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Common Method ◽  
Filler Materials ◽  
High Quality ◽  
Welding Technology

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.

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

1994 ◽  
Vol 8 (8) ◽  
pp. 646-648 ◽  
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

Influence of Residual Stresses on the Weld Metal Hardness of 5V Titanium Alloy

2021 ◽  
Vol 410 ◽  
pp. 359-365
Author(s):  
Egor V. Terentyev ◽  
Artem Yu. Marchenkov ◽  
Ksenia T. Borodavkina
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Residual Stresses ◽  
Weld Metal ◽  
Welded Joints ◽  
Arc Welding ◽  
Electron Beam Welding ◽  
The Difference ◽  
Metal Hardness ◽  
Hardness Values

Influence of residual welding stresses on the hardness values of the weld metal is studied. The investigations were carried out on 5V titanium alloy welded joints, obtained by electron-beam welding and argon-arc welding (TIG-welding). It is shown that the nature of the residual stresses distribution depends on the parameters of welding and affects the hardness values of the weld metal. It is shown, that the difference between the hardness values of the metal after welding and the metal after partial relief of residual stresses on the investigated alloy is up to 90 MPa, which is about 3% of the weld metal hardness level.

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