Fatigue performance and fatigue damage parameter estimation of spot welded joints of aluminium alloys 6111‐T4 and 5754

Abstract

In the present study, fatigue behaviours of spot welded joints of aluminium alloys 6111‐T4 and 5754 have been experimentally investigated. Fatigue results indicate that fatigue strength of spot weld primarily depends on specimen loading type and gauge thickness. Effects of base material and load ratio on fatigue resistance of welded specimen are insignificant. An equivalent stress based fatigue damage parameter is derived to consolidate empirical data and develop predictive capabilities for automobile designers. The fatigue damage parameter defined in this study is proven effective in consolidating a large amount of fatigue data into a narrow band and is especially suitable for the comparative fatigue strength evaluation of components and specimens.

Mechanical properties and corrosion behavior of similar/dissimilar resistance spot welded automotive aluminum alloys

“…The melting and solidification cycle during spot resistance welding causes the elimination of strength‐enhancing phenomena in base materials. Similarly, AA6111‐T4 and AA 5754 were welded by resistance spot welding [18]. It was stated that melting and re‐solidification suppressed the precipitation hardening in the alloy.…”

Study on microstructures and fatigue behavior of dissimilar Al/steel resistance spot welded joint

“…High specific strength materials are increasingly used in the design and manufacture of body frame components, such as aluminum alloy, magnesium alloy, and composite materials 1,2 . Among these materials, aluminum alloy has been widely used in industry because of its low density, high strength, and corrosion resistance 3–5 . Consequently, the joining of dissimilar metals aluminum alloy to conventional automobile body material high strength steel has become the focus of research.…”

“…1,2 Among these materials, aluminum alloy has been widely used in industry because of its low density, high strength, and corrosion resistance. [3][4][5] Consequently, the joining of dissimilar metals aluminum alloy to conventional automobile body material high strength steel has become the focus of research. Although there are many welding methods that can complete the connection of dissimilar metal sheets, such as friction stir spot weld, laser welding-brazing, clinch-resistance spot weld, and ultrasonic spot weld, [6][7][8][9][10] the resistance spot welding is still concerned by many researchers.…”

Fracture Characteristics and Analysis in Dissimilar Cu-Al Alloy Joints Formed via Electromagnetic Pulse Welding

“…In recent years, vehicle lightweighting has played a key part in energy saving and environment protection in the transportation industry [1,2,3,4]. Aluminum alloys, as an important type of lightweight material, have become increasingly popular due to their high strength-to-weight ratio, good formability, machinability and recyclability [5]. Meanwhile, there is a high demand to weld Al to other materials, namely, Fe, Cu, Mg, plastics, etc., for maximizing the potential of lightweight structures and electrical power components (e.g., power cables, connectors and terminals) associated with relatively low weight and cost in electrical vehicles [6,7].…”