Microstructure and fatigue properties of resistance element welded joints of DP500 steel and AW 5754 H22 aluminum alloy

Đurić, Aleksija (author), Milčić, Dragan (author), Burzić, Zijah (author), Klobčar, Damjan (author), Milčić, Miodrag (author), Marković, Biljana (author), Krstić, Vladislav (author)

The modern concept of lightweight design (LW) requires the application of different materials in one structure (multi-material structures). The structure of different materials has a good perspective for application in the automotive and aerospace industries but only if it is possible to achieve a quality joint between different materials. The most used technology for joining different materials in the automotive industry is Resistance spot welding (RSW). Due to different mechanical, physical, and chemical properties, the joining of different materials by RSW technology does not provide a quality joint, and accordingly, alternative technologies for joining different materials have emerged. Resistance element welding (REW) was developed to enable joint of different materials. This paper presents the welding of AW 5754 H22 Al alloy (1.0 mm-thick) and DP500 steel (1.5 mm-thick) using novel REW. The peak load, absorption energy, microstructure, microhardness and fatigue strength of the REW joint has been investigated. The joint of the same materials has been done also using conventional RSW to compare some results. The results that will be presented in this paper show that that REW can achieve reliable joining of the two materials at relatively low welding currents compared to RSW. Using REW process with a significantly lower welding current, satisfactory mechanical characteristics of the weld joint can be achieved, so peak load is between 2300–2500 N, displacement is between 2.5–3 mm and the absorption energy is between 3.3–5.7 J. REW joints showed fatigue strength with the fatigue limit of 882 N.

• Language: English
• Keywords: resistance spot welding, resistance element welding, dissimilar materials joints, microstructure, microhardness, fatigue strength
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 15 str.
• Numbering: Vol. 12, iss. 2, art. 258
• PID: 20.500.12556/RUL-137698
• UDC: 621.791
• ISSN on article: 2073-4352
• DOI: 10.3390/cryst12020258
• COBISS.SI-ID: 112978691
• Publication date in RUL: 28.06.2022

Record is a part of a journal

• Title: Crystals
• Shortened title: Crystals
• Publisher: MDPI
• ISSN: 2073-4352
• COBISS.SI-ID: 36677893

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 14.02.2022

Secondary language

• Language: Slovenian
• Keywords: uporovno točkovno varjenje, mikrostruktura, mikrotrdota, spoji

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: BI-BA/21-23-026
• Name: Research and analysis of advanced joining technology of dissimilar materials that are used in the development of lightweight structures

• Funder: MESTD - Ministry of Education, Science and Technological Development of Republic of Serbia
• Project number: 451-03-9/2021-14/200109