Influence of Beam Power on Structures and Mechanical Characteristics of Electron-Beam-Welded Joints of Copper and Stainless Steel

Kaisheva, Darina; Anchev, A. P.; Valkov, Stefan; Dunchev, V. P.; Kotlarski, Georgi; Stoyanov, Borislav; Ormanova, Maria; Atanasova, Milka; Petrov, P.

doi:10.3390/met12050737

Cited by 8 publications

(5 citation statements)

References 36 publications

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“…For this reason, the plates were preheated to a temperature of 200 • C. Another important factor that was necessary for the formation of a strong joint is the offset of the beam toward the aluminum alloy [29]. Our previous studies [30] demonstrated that shifting the electron beam toward the metal with lower melting temperature results in the formation of a higher integrity weld.…”

Section: Methodsmentioning

confidence: 99%

Electron-Beam Welding Cu and Al6082T6 Aluminum Alloys with Circular Beam Oscillations

et al. 2022

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In this study, we present the results from electron-beam welding operations applied on copper and Al6082T6 aluminum alloys. The influence of beam-scanning geometries on the structure and mechanical properties of the welded joint is studied. The experiments were conducted using a circle oscillation mode with an oscillation radius of 0.1 mm and 0.2 mm. The beam deflection was set to 0.4 mm with respect to the side of the aluminum alloy, and the beam power was set at 2700 W. The phase composition of the obtained welded joints was studied by X-ray diffraction (XRD). Scanning electron microscopy (SEM) was used for the investigation of the microstructure of the joints. The chemical composition was investigated by using energy-dispersive X-ray spectroscopy (EDX). The mechanical properties were studied by micro-hardness investigations. The fusion zone of the weld seam contains three phases—an aluminum matrix, an ordered solid solution of copper and aluminum in the form of CuAl2, and pure copper. Electron beam-scanning geometries have significant influences on the structure of the weld. Increasing the beam oscillation’s radius leads to a decrease in intermetallic phases and improves homogeneity. The measured microhardness values in the fusion zone are much higher than the ones measured in the base metals due to the formation of intermetallic phases. The microhardness of the weld joint formed using an oscillation radius of 0.2 mm was much lower compared to the one formed using an oscillation radius of 0.1 mm.

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Section: Methodsmentioning

confidence: 99%

Electron-Beam Welding Cu and Al6082T6 Aluminum Alloys with Circular Beam Oscillations

et al. 2022

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“…Obtaining a strong joint between titanium and aluminum alloy is a difficult task due to the different thermophysical characteristics of the two materials [3]. Electron beam welding (EBW) is a suitable technology for fabrication of joint between dissimilar materials [4][5][6][7][8]. This method allows the formation of deep welded joints with very high degree of purity.…”

Section: Introductionmentioning

confidence: 99%

Effect of the beam oscillation on the structure and mechanical properties of electron beam welded joints of Ti6Al4V and Al6082-T6 alloys

Kaisheva,

Dunchev,

Anchev

et al. 2024

J. Phys.: Conf. Ser.

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The results of electron beam welding of Ti6Al4V and Al6082-T6 alloys are presented. The influence of electron-beam scanning geometry on the structure and mechanical properties of the welded joint is studied. Two kinds of samples were investigated – the first specimen was welded without beam oscillation and the second one was obtained using an oscillating electron beam following a circular trajectory of scanning with an oscillation radius of 0.2 mm. X-ray diffraction (XRD) method was used for the determination of the phase composition of the welded joints. The microstructure of the welded joints was studied using Scanning electron microscopy (SEM). Energy-dispersive X-ray spectroscopy (EDX) was applied for the chemical composition investigation. Tensile experiments and microhardness measurements were performed to study the mechanical properties of the welded joints. The sample welded without the application of an oscillating beam showed higher values for the yield strength and tensile strength. The values measured for the microhardness within the welded seam are about 450 HV0.05 in both cases. However, the application of a beam oscillation leads to a significant increase in the micro-hardness of the heat affected zone at the Ti-based alloy. The measured values reached 627 HV0.05.

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“…This process can occur with or without the use of filler material, with continuity in the nature of the material of the parts. Welding copper alloys can be carried out using various methods, such as laser, electron beam, resistance, friction, ultrasonic, electromagnetic pulse, and brazing [13][14][15][16]. Brazing is a process of joining materials that occur through the melting and solidification of a filler metal that is placed in contact with the base material, that is, with the components to be welded, resulting in a watertight and tight joint in a structural connection between the pieces.…”

Section: Introductionmentioning

confidence: 99%

Brazing of Copper Pipes for Heat Pump and Refrigeration Applications

Pereira,

Dias,

Rios

et al. 2024

Metals

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In heat pumps and refrigeration systems, copper parts play a crucial role. Since heat pumps for space and water heating work under high pressure and are susceptible to vibrations, it is crucial to perfectly weld the copper pipes and heat exchangers to avoid system failures and prevent the leakage of the circulating refrigerants, which are harmful to the environment. The welding of the copper pipes is usually performed by the brazing process in a furnace. The components are subjected to a period of approximately 50 min inside a continuously open oven, varying the temperature from 710 °C to 830 °C. The oven inlets and outlets are protected by nitrogen curtains to guarantee a suitable internal environment and prevent the contamination of the gas inside the oven. This work analyses which welding methods are most suitable for welding copper, the best joint shape, process time, brazing specimens of a copper alloy, tightness tests, and mechanical properties and composition of the welding samples. From the tests carried out, the appearance of small and large defects is reduced by using a 1 mm thick external ring of filler material and a brazing temperature of 820 °C.

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Influence of Beam Power on Structures and Mechanical Characteristics of Electron-Beam-Welded Joints of Copper and Stainless Steel

Cited by 8 publications

References 36 publications

Electron-Beam Welding Cu and Al6082T6 Aluminum Alloys with Circular Beam Oscillations

Electron-Beam Welding Cu and Al6082T6 Aluminum Alloys with Circular Beam Oscillations

Effect of the beam oscillation on the structure and mechanical properties of electron beam welded joints of Ti6Al4V and Al6082-T6 alloys

Brazing of Copper Pipes for Heat Pump and Refrigeration Applications

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