PROCESSING OF COPPER AND METAL MELTS BY ELECTROMAGNETIC PULSES

Abstract

Background. Electromagnetic Pulse Technology (TEM) is a non-contact pulse process with great potential for connecting dissimilar materials. This method uses pulsed electromagnetic fields to form and connect metals with high conductivity, such as aluminum or copper. This process makes it possible to perform connections with geometric closure and tension due to compression or expansion of profile structures of alloys with a closed cross section, as well as metallurgical welds. Despite the technological advantages and potential, only a modest introduction into industrial applications has been found. This scientific article aims to reveal the industrial interest and applicability of electromagnetic pulse technology in various subsectors of the microelectronic industry, promoting lightweight and highprecision engineering components. Materials and methods. Based on numerical and experimental studies, copper-copper and copper-aluminum electrical connections are produced by electromagnetic pulse crimping. The main parameters are determined and their influence on the connection process and the achievable strength of the connection is analyzed. Attention is paid to the development of electromagnetic drives. The fundamentals of the theory of magnetic and pulsed welding are applied. Results. Conclusions and instructions on the design of the manufacture of compounds using electromagnetic pulse technology are given. A simplified approach to modeling is presented for numerical studies. This unrelated approach makes it possible to successfully develop the process and design of the connection for electromagnetic pulse crimping. Various welding parameters are indicated, which determine the different morphology of the surface, the section with different mechanical strength. The influence of the mandrel surface on the quality of the joint is evaluated. Conclusions. The weldability criteria for copper and aluminum compounds have been experimentally determined. The influence of several parameters of the experimental welding process, namely the discharge energy, gaps and holes, is evaluated using destructive tests.

Keywords

• welding joint
• impact welding
• electromagnetic pulse crimping
• magnetic pulse welding
• numerical modeling
• joint design
• joint formation