Resistance Spot Welding of Aluminum Alloy

Low melting point alloy, yield strength low thermal conductivity with good performance characteristics and the presence of surface oxide film, to resistance spot welding has led to great difficulties, in recent years, made the following major national welding some research scientists:
In the aluminum alloy spot welding electrode life research, American University of Waterloo Lum, L in the study of 5182 aluminum alloy spot welding electrode life, using a scanning electron microscope, SEM / EDX, XRD and other methods, studies have shown [14]: from decline to the final failure of the main   electrode through the aluminum strip, aluminum and copper alloy, the electrode and the electrode end face plaque pits four stages, the plaque and the pit originated in the aluminum alloy strip and, therefore, that on a regular basis of Clean the surface of the electrode to increase the electrode life is conducive to the production of aluminum automotive applications; the University of California Fresz, B of the copper electrode of alloy composition on the life of the electrode [15], experiments using Cu-Cr, Cu-Zr, Cu-Cr-Zr, Cu-Be the copper electrode materials, such as different; Dorn, Lutz et al proposed using composite electrodes when welding aluminum to improve their life [16], study, chromium zirconium copper in the electrical Department of tungsten composite mosaic of extreme welding aluminum electrodes and found that the electrode life can be increased by 1.5 to 2 times.
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In the aluminum alloy spot welding process research, Sari, H. and other scholars through the aluminum spot welding experiment, the aluminum alloy spot welding electrode contact radius when the relationship between contact resistance and the electrode contact with the workpiece and the workpiece radius The relationship between contact area [17]; the University  of Michigan Cho, Y experimental method used to compare the resistance spot welding aluminum and steel technology [18], derived from leaves according to the test curve to determine the welding current range of available and the destruction of the button pad diameter, and with these two parameters to evaluate the quality of spot welding aluminum and steel, experiments show that: Electrode Size on the button after the destruction of steel joints have a great impact in diameter, but aluminum welding point is not very good correspondence between the   buttons after the destruction of Al solder joint diameter fluctuated considerably.
In addition, the aluminum alloy spot welding process, finite element simulation is also a research focus in recent years, scholars from various countries [9] [19].