题目：Pulsed operation of the DC welding power soPulsed operation of the DC welding power source in resistance weldingurce in resistance welding/Properties and Applications of Superconducting Technology for Modern Energy and Transport Transition

时间：2025年3月25日 15:00-16:30

地点：机械与动力工程学院 高田会议室

邀请人：夏裕俊 助理教授（薄板结构制造研究所）

报告题目：Pulsed operation of the DC welding power soPulsed operation of the DC welding power source in resistance weldingurce in resistance welding

报告人：Dr. Zygmunt Mikno

Biography

Dr Hab. Eng. Zygmunt Mikno [PhD (DSc) Habilitated Eng.)] is the Deputy Director of the Welding Centre at the Upper Silesian Institute of Technology. He obtained his master's, doctoral and postdoctoral degrees in electrical engineering and mechanical engineering, respectively at the Silesian University of Technology in Gliwice and the Wroclaw University of Technology, in 1989, 2005 and 2019. His area of research interests includes monitoring welding processes (parameter measurements), quality assessment in welding engineering, design of test rigs used in welding engineering,  temperature measurements in welding processes, modelling of welding processes (resistance welding) and cryogenics in welding processes. He is the author and co-author of over 200 scientific publications, including books, articles in journals and at conferences, 35 patents and over 40 implementations in industry. He has participated in the implementation of numerous research projects. Dr Mikno is a member of many national and international organizations including a senior member of IEEE, a member of the European AWS (American Welding Science) and the organizer of the meeting of Commission III of the IIW. Zygmunt Mikno completed a course and obtained an IWE certificate of competence according to the accreditation by the European Federation for Welding, Joining and Cutting and the International Institute of Welding.

Abstract

The resistance welding process is commonly used in industry. The main area of application is the automotive industry. Each improvement in welding technology affects the safety of users of joined structures. This is also the case subjected to analysis, i.e. the projection welding of nuts to which the seat belt in a car is attached. The driver's and passengers’ health and life depend on the quality of this joint.

The analysis was concerned with influence of the pulsed welding current (DC 1 kHz) on the course of the projection welding of nuts. The analysis was carried out relative to the condition of the same root-mean-square pulsed DC compared to continuous (i.e. commonly used) DC (within the so-called conventional mode). The analysis involved nuts welded to another element, i.e. sheet metal. The numerical analysis was performed using SORPAS software. The characteristic parameters subjected to analysis included weld strength, volume of molten material (in the area subjected to welding), the area of the molten material in the contact area and welding energy. The results of numerical calculations were verified experimentally. The tests demonstrated a beneficial effect of the pulsed welding current on the quality of welded joints (in particular strength).

报告题目：Properties and Applications of Superconducting Technology for Modern Energy and Transport Transition

报告人：Assoc. Prof. Mariusz Stepien

Biography

Dr Mariusz Stepien is an Associate Professor at the Department of Power Electronics, Electrical Drives, and Robotics, Faculty of Electrical Engineering, Silesian University of Technology (SUT). He received the M.Sc., Ph.D., and Habilitate Doctorate (D.Sc.) degrees, all in electrical engineering, from SUT, Gliwice, Poland, in 1999, 2006 and 2019, respectively. His area of research interests includes power electronics, energy conversion, superconductivity, high frequency and special transformers, resistance welding machines, FEM modeling of electrical engineering and interdisciplinary problems. He is an author and co-author of almost 200 scientific publications, including books, journal and conference papers and patents. Participated in implementation of numerous research and educational projects, many of them funded by EU programs. Dr. Stepien is a senior member of the IEEE and a member European Society of Superconductivity (ESAS). He is serving as a Vice Chair of the Chapter of Magnetics, Polish Section of the IEEE and a Vice Chair of the Power Electronics and Motion Control Council.

Abstract

Superconducting technology, especially in the area of high-temperature superconductivity, is a subject with great application potential in modern energy transition. Characterized by the use of advanced materials with unique mechanical, electrical and thermal properties, it allows for the development of devices with unprecedented efficiency and energy density. Due to the complexity and interdisciplinary nature of the issue, superconductivity requires intensive research, both in terms of material structures, mechanical and thermal properties, as well as electrical and magnetic properties. The lecture will present the main properties and challenges related to superconductivity and the main application areas of this technology in the aspect of energy transition its natural environment influence. Selected examples of research activity of international teams and their achievements in the field of superconducting technology applications in high-power devices and in modern vehicles and transport systems will be presented and discussed.