Effect of thermal cycles in electron beam welding of aluminium 1570 alloy on mechanical properties of welded joints

2021 ◽  
Vol 2021 (5) ◽  
pp. 35-40
Author(s):  
V.M. Nesterenkov ◽  
◽  
V.V. Skryabinskyi ◽  
M.O. Rusynyk ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Thermal Cycles

Effect of thermal cycles in electron beam welding of aluminum 1570 alloy on mechanical properties of welded joints

2021 ◽  
Vol 2021 (5) ◽  
pp. 40-45
Author(s):  
V.M. Nesterenkov ◽  
◽  
V.V. Skryabinsky ◽  
М.О. Rusynyk ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Thermal Cycles

Investigation on the microstructure and mechanical properties of Ti6Al4V titanium alloy electron beam welding joint

2022 ◽  
pp. 095440622110329
Author(s):  
Xilong Zhao ◽  
Xinhong Lu ◽  
Kun Wang ◽  
Feng He
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Electron Beam ◽  
Penetration Depth ◽  
Welding Speed ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Martensite Phase ◽  
Ti6al4v Titanium Alloy ◽  
Microstructure And Mechanical Properties

Electron beam welding (EBW) is a fusion joining process particularly suitable for welding titanium plates. In the present work, 2.5 mm thickness Ti6Al4V titanium alloy plates were butt-welded together with backing plates by EBW. The detailed procedures of experiments were used to investigate the microstructure and mechanical properties of welded joints. The optimum welding speed was determined by microstructure examinations, microhardness tests, X-Ray diffraction tests, shear punch tests (SPT) and stress simulation calculations. The results showed that all microstructure of welded metal (WM) was martensite phase under the different welding speeds. In the heat-affected zone (HAZ), the martensite phase gradually evolved to be small and equiaxed. It can be seen that the microstructure of each region in welded joints did not change significantly. When the welding speed is between 8 mm/s and 14 mm/s, it can be seen from the macroscopic appearance of the joints that there was no utterly fused penetration between the butt plate and substrate. Finite element simulation was carried out for the no-penetration depth under different welding conditions, and it was found that the stress suffered by the small no-penetration depth was the smallest. Using different welding parameters shows that the engineering stress in WM was higher than other areas, and BM was the lowest. As welding speed increases from 8 mm/s to 14 mm/s, the variation of microhardness distribution was not evident.

scholarly journals Application of Dynamic Beam Positioning for Creating Specified Structures and Properties of Welded Joints in Electron-Beam Welding

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2233
Author(s):  
Tatyana Olshanskaya ◽  
Vladimir Belenkiy ◽  
Elena Fedoseeva ◽  
Elena Koleva ◽  
Dmitriy Trushnikov
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Weld Metal ◽  
Thermal Effect ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Welded Joint ◽  
Parent Metal ◽  
Cooling Rates ◽  
Structures And Properties

The application of electron beam sweep makes it possible to carry out multifocal and multi-beam welding, as well as combine the welding process with local heating or subsequent heat treatment, which is important when preparing products from thermally-hardened materials. This paper presents a method of electron beam welding (EBW) with dynamic beam positioning and its experimental-calculation results regarding the formation of structures and properties of heat-resistant steel welded joints (grade of steel 20Cr3MoWV). The application of electron beam oscillations in welding makes it possible to change the shape and dimensions of welding pool. It also affects the crystallization and formation of a primary structure. It has been established that EBW with dynamic beam positioning increases the weld metal residence time and the thermal effect zone above the critical A3 point, increases cooling time and considerably reduces instantaneous cooling rates as compared to welding without beam sweep. Also, the difference between cooling rates in the depth of a welded joint considerably reduces the degree of structural non-uniformity. A bainitic–martensitic structure is formed in the weld metal and the thermal effect zone throughout the whole depth of fusion. As a result of this structure, the level of mechanical properties of a welded joint produced from EBW with dynamic electron beam positioning approaches that of parent metal to a greater extent than in the case of welding by a static beam. As a consequence, welding of heat-resistant steels reduces the degree of non-uniformity of mechanical properties in the depth of welded joints, as well as decreases the level of hardening of a welded joint in relation to parent metal.

Electron Beam Welding of Aluminium Alloy AW2099

2020 ◽  
Vol 994 ◽  
pp. 28-35
Author(s):  
Ján Urminský ◽  
Milan Marônek ◽  
Jozef Bárta ◽  
Martin Sahul ◽  
František Jurina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Hardness Measurement ◽  
Metallographic Analysis ◽  
Fusion Boundary ◽  
Lithium Alloy ◽  
Static Tensile ◽  
Lithium Alloys

The paper deals with the analysis of mechanical properties of welded joints made of AW 2099 aluminium-lithium alloy by electron beam welding. The thickness of the experimental material was 3±0.2 mm. PZ EZ 30 STU electron beam welding machine was used for production of welds. Maximum accelerating voltage used within this study was 55 kV. Metallographic analysis, hardness measurement test and static tensile were carried out. The structure of the weld joint of aluminium-lithium alloy was investigated. Produced welded joints were characterized by the presence of following zones: heat affected zone (HAZ), equiaxed non-dendritic zone (EQZ), columnar dendritic zone (CDZ) and equiaxed dendritic zone (EDZ). EQZ grains were formed due to heterogeneous nucleation on precipitates at the fusion boundary. EQZ is typical for joining of aluminium lithium alloys.

scholarly journals Influence of Welding Speed on the Microstructure and Mechanical Properties of Electron Beam-Welded Joints of TC4 and 4J29 Sheets using Cu/Nb Multi-Interlayers

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 810 ◽  
Author(s):  
Defeng Mo ◽  
Yang Wang ◽  
Yongjian Fang ◽  
Tingfeng Song ◽  
Xiaosong Jiang
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Strength ◽  
Electron Beam ◽  
Welding Speed ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Microstructure And Mechanical Properties ◽  
Hardness Tests ◽  
Weld Appearance

Dissimilar metal joining between titanium and kovar alloys was conducted using electron beam welding. Metallurgical bonding of titanium alloys and kovar alloys was achieved by using a Cu/Nb multi-interlayer. The effects of welding speed on weld appearance, microstructure and mechanical properties of welded joints were investigated. The microstructure of welded joints was characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS). The mechanical properties of welded joints were investigated by tensile strength and micro-hardness tests. The results showed that welding speed had great effects on the weld appearance, microstructure, and mechanical properties of electron beam-welded joints. With an increase of welding speed, at the titanium alloy side, the amount of (Nb,Ti) solid solution was increased, while the formation of brittle FeTi was effectively suppressed. At the kovar alloy side, microstructure was mainly composed of soft Cu solid solution and some α-Fe + γ phases. In addition, higher welding speeds within a certain range was beneficial for eliminating the formation of cracks, and inhibiting the embrittlement of welded joints. Therefore, the tensile strength of welded joints was increased to about 120 MPa for a welding speed of 10 mm/s. Furthermore, the bonding mechanism of TC4/Nb/Cu/4J29 dissimilar welded joints had been investigated and detailed.

Electron Beam Welding of High Strength Quenched and Tempered Steel

2016 ◽  
Vol 879 ◽  
pp. 2078-2083 ◽  
Author(s):  
Marek Stanisław Węglowski ◽  
Sylwester Błacha ◽  
Stanisław Dymek ◽  
Mateusz Kopyściański
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
High Strength ◽  
Fusion Line ◽  
Zone Boundary ◽  
Base Materials ◽  
Steel Grades ◽  
Quenched And Tempered Steel

The paper deals with the investigation of microstructure and mechanical properties of electron beam welded joints of high strength steel grades S690QL and S960QL in quenched and tempered condition. The microstructure of base metal was composed of bainite and martensite mixture at hardness about 270HV10 and 340HV10 for the S690QL and S960QL steels, respectively. The weldment was composed of several characteristic subzones revealed on the transverse sections. The central region of the weldment consisted mainly of coarse columnar dendritic grains which perpendicular to the fusion zone boundary. The microstructure of the heataffected zone near the fusion line consisted mainly of martensite, however, in both steels the microstructure varied with the distance from the fusion line. The tensile strengths of welded joints were Rm=850 MPa (S690QL) and 1074MPa (S960QL) and corresponded the tensile strengths of the base materials.

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