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title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Development of the process of resistance spot welding of high-strength steels
Creators: name: ÐÐµÑÑÐ¾Ð², ÐÐ¸ÐºÐ¾Ð»Ð°Ð¹
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: Ð¡ÑÐ°Ð»Ñ Ð²ÑÑÐ¾ÐºÐ¾Ð¿ÑÐ¾ÑÐ½Ð°Ñ
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description: The paper considers the technology of resistance spot welding of modern high-strength steels used in the car body (body-in-white). The analysis of the literature data on the use of the second pulse in the cycle of resistance spot welding and the failure modes of the joint obtained by this method is carried out. Tasks of the final qualification work: - analysis of scientific and technical information on resistance spot welding and modern high-strength steels; - choose and justify welding methods; - analysis of the microstructure of the welded joint and the failure mode. Every year, more advanced high-strength steels are used for the car body manufacturing. These materials have a good combination of strength and ductility. However, there are a number of drawbacks. One of them is embrittlement during resistance spot welding. To eliminate this defect, resistance spot welding with the use of a second pulse was considered. In the course of experiments and the selection of optimal parameters of the RSW of various types of modern high-strength steels, it was revealed that due to the second pulse, the hardness of the fusion zone decreases. This indicates that due to this method, embrittlement does not occur. In addition, two failure modes of the welded nugget were considered: interfacial failure and pullout failure. It was found that the transition from the first mechanism to the second indicates an increase in the size of the melting zone and an increase in the viscosity of the weld due to t tempering of martensite at the second pulse.