Energy-storage welding connection characteristics of
rapidly solidified Cu-Co alloy foils①
rapidly solidified Cu-Co alloy foils①
(1.School of Materials Science and Engineering,
Xi′an University of Technology, Xi′an 710048, China;
2.Laboratory of Materials Science in Space, Northwestern Polytechnical University,
Xi′an 710072, China)
Xi′an University of Technology, Xi′an 710048, China;
2.Laboratory of Materials Science in Space, Northwestern Polytechnical University,
Xi′an 710072, China)
Abstract: The connection characteristics of rapidly solidified Cu-40%Co alloy foils were studied using a self-developed micro-type energy-storage welding machine. The results show that the microstructure of the alloy foils is characterized by uniform and fine equiaxed grains, whose maximum grain size is 1.8μm. Under the optimum energy, the regular flat nugget is formed, low voltage and high capacitance are favorable for obtaining the perfect connection joints, whereas high voltage and low capacitance are likely to result in the surface burn of the alloy foils. With the increase of welding energy, the spot welding joint will be transformed from regular flat nugget to nugget-free one, and the microstructure tends to coarsen. The welding parameters recommended are: welding voltage 80 100 V, electric capacitance 1 800 2 500μF, and welding force 4 8 N.
Key words: rapidly solidified alloy foils; energy-storage welding; nugget; joint microstructure