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

In this study, we present the results of electron-beam welding of joints with 304-L stainless steel and copper. The influence of the beam’s power on the structures and mechanical properties of the welded joints was studied; the experiments were realized at a beam deflection of 0.3 mm to the Cu plate...

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Bibliographic Details
Published in:Metals (Basel ) 2022-04, Vol.12 (5), p.737
Main Authors: Kaisheva, Darina, Anchev, Angel, Valkov, Stefan, Dunchev, Vladimir, Kotlarski, Georgi, Stoyanov, Borislav, Ormanova, Maria, Atanasova, Milka, Petrov, Peter
Format: Article
Language:English
Subjects:
Chemical composition
Chemical elements
Copper
Cu–stainless steel joints
Electron beams
electron-beam welding
Investigations
Mechanical properties
Microhardness
Microstructure
phase composition
Solid solutions
Stainless steel
Stainless steels
Substitutional solid solutions
tensile properties
Tensile tests
Welded joints
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Summary:In this study, we present the results of electron-beam welding of joints with 304-L stainless steel and copper. The influence of the beam’s power on the structures and mechanical properties of the welded joints was studied; the experiments were realized at a beam deflection of 0.3 mm to the Cu plate and beam powers of 2400, 3000, and 3600 W. The phase compositions of the obtained welded joints were studied by using X-ray diffraction (XRD); the microstructure and chemical composition were investigated by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX), respectively. The mechanical properties were studied by using tensile experiments and microhardness investigations. The phase compositions of the welded joints were in the forms of substitutional solid solutions between Fe, Cu, and pure copper and remained unchanged in terms of power. It was found that the microstructures changed gradually with the application of different values of the power of the electron beam. The results of the tensile tests showed higher tensile strengths at lower beam powers (i.e., 2400 and 3000 W) that dropped at 3600 W. The relative elongations rose with increases in the power of the electron beam. Moreover, it was found that the microhardnesses strongly depended on the applied technological conditions (defined by the electron beam’s power) and the corresponding microstructures of the welded joints.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12050737