Microstructure and Fatigue Properties of Resistance Element Welded Joints of DP500 Steel and AW 5754 H22 Aluminum Alloy

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