The effects of welding current on the microstructure and performance of aluminum alloy joint were researched by DN-100 type fixed spot welding and metallographic microscope. The results show that, when the welding current is small, the nugget is small, and the grains are coarse and uneven, and then the defects appear. Along with the welding current increasing, the nugget increases, the effective nuclear fusion forms, the grain is small and uniform, and the performance improves.
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