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The Influence of Mg Additive on the Structure and Electrical Conductivity of Pure Copper Castings

M. Kranc A. Garbacz-Klempka M. Górny G. Sikora

Archives of Foundry Engineering | 2017 | vol. 17 | No 4 | DOI: 10.1515/afe-2017-0135

Keywords Solidification Process Primary grains Pure copper Castings Mg additive Electrical conductivity

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Abstract

The aim of this paper was to attain defect free, pure copper castings with the highest possible electrical conductivity. In this connection, the effect of magnesium additives on the structure, the degree of undercooling (ΔTα = Tα-Tmin, where Tα – the equilibrium solidification temperature, Tmin – the minimum temperature at the beginning of solidification), electrical conductivity, and the oxygen concentration of pure copper castings have been studied. The two magnesium doses have been investigated; namely 0.1 wt.% and 0.2 wt.%. A thermal analysis was performed (using a type-S thermocouple) to determine the cooling curves. The degree of undercooling and recalescence were determined from the cooling and solidification curves, whereas the macrostructure characteristics were conducted based on a metallographic examination. It has been shown that the reaction of Mg causes solidification to transform from exogenous to endogenous. Finally, the results of electrical conductivity have been shown as well as the oxygen concentration for the used Mg additives.

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Authors and Affiliations

M. Kranc

A. Garbacz-Klempka

M. Górny

G. Sikora

Optimization of Process Parameters of Ultrasonic Welding on Dissimilar Metal Joints

A. Mohan Kumar R. Rajasekar V. Karthik S. Kheawhom

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 887-892 | DOI: 10.24425/amm.2021.136394

Keywords 3105-H18 aluminium alloy pure copper ultrasonic welding optimization micro-hardness

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Abstract

Nowadays the automotive industry mostly prefers innovative solid-state welding technologies that would enable to welding of lightweight and high-performance materials. In this work, 3105-H18 Aluminium alloy (Al) and pure Copper (Cu) specimens with 0.5 mm thickness have been ultrasonically welded in a dissimilar (Al-Cu) manner. Optimization of process parameters of ultrasonic welding has been carried out through full factorial method, three levels of variables considered for this experimental studies namely, weld pressure, amplitude, and time, also each variable interaction with welding strength has been studied. Additionally, micro-hardness and microstructure investigation in welded joints has been studied. The result shows that the weld strength greatly influenced weld amplitude at a medium and higher level of weld pressure. The interface micro-hardness of the welded joint has lower compared to the base metal.

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Bibliography

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Authors and Affiliations

A. Mohan Kumar

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ORCID:

R. Rajasekar

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ORCID:

V. Karthik

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ORCID:

S. Kheawhom

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ORCID:

School of Building and Mechanical Sciences, Kongu Engineering College, Erode, Tamilnadu, India - 6380602
NIT, Tiruchirappalli, Department of Metallurgical and Materials Engineering, Tamilnadu, India – 620015
Chulalongkorn University, Faculty of Engineering, Department of Chemical Engineering, Bangkok, Thailand – 10330

Investigation on contact surfaces damage of copper contacts by an electric arc

Kada Hadda Amine Beloufa Mohamed Amirat Aissa Boutte

Archive of Mechanical Engineering | 2024 | Articles accepted

Keywords automotive electrical connector pure copper electric arc connector damage experimental tests contact surfaces analysis by SEM & EDX

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Abstract

Electrical contacts are used in general electrical applications such as circuit breakers, switches, relays, connectors, etc. Repeated separations of the parts (anode and cathode) of these contacts under input power can damage their contact materials. The objective of this work is to study the influence of the input electric power (100 W and 256W) and the contact sizes (hemispherical contacts with diameters D=5mm and D=8mm) on the variation of the arc energy and the damage of the contact surfaces by oxidization or by erosion. These parameters are decisive for selecting the best arc-resistant contact sample. Experimental results, SEM, and EDX analysis show that high input power leads to more degradation of contact surfaces. Also, the smaller and the larger contact diameters generate similar arcing energies with similar erosion sizes and oxidation rates, but contact with a small diameter has a higher lifetime (1215 operations) and oxidizes less quickly than the one with a large diameter that has a lower lifetime (374 operations). Experimental and numerical analyses demonstrate that arc mobility is one of several factors influencing the change in contact lifetime.

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Authors and Affiliations

Kada Hadda

1 2

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Amine Beloufa

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Mohamed Amirat

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Aissa Boutte

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ORCID:

Smart Structure Laboratory, University of Ain Temouchent, Algeria
Algerian Space Agency - Satellite Development Center, Oran, Algeria

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The Influence of Mg Additive on the Structure and Electrical Conductivity of Pure Copper Castings

Abstract

Authors and Affiliations

Optimization of Process Parameters of Ultrasonic Welding on Dissimilar Metal Joints

Abstract

Bibliography

Authors and Affiliations

Investigation on contact surfaces damage of copper contacts by an electric arc

Abstract

Authors and Affiliations