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Experimental Study on Electromagnetic Pulse Joining Technology of AA1060-DP600 Sheet

LI Hao-huaa, ZAHNG Mei-fua, JIANG Xia, YU Hai-pinga,b

(a. School of Materials Science and Engineering, b. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China)

The effects of coil turns, lap area width, lap gap and discharge voltage of magnetic pulse joining process on the quality of AA1060-DP600 plates joint was investigated by numerical simulation and experiments based on flat coil. The finite element model of magnetic pulse joining of AA1060-DP600 plates with size parameters of 80 mm¡Á40 mm¡Á1 mm was established based on LS-DYNA. Experiments were carried out by coilwith optimal number of turns, and the tensile properties of the joints were tested by electronic universal testing machine. The microstructure of the joint was observed by metallographic microscope. Combined with the results of simulation and process test, the influences of each parameters on the quality of the joint were analyzed. As the number of turns of the flat coil increases from 1 turn to 6 turns, the collision speed firstly increases and then decreases, and reaches the maximum value at 3 turns. 2.5 mm or 1.5 mm lap gap reduce the impact speed and thus the joint strength. The impact speed increases with the increase of the width of the lap area. The strength of the joint increases with the increase of the discharge voltage, and the joining is easier to achieve when the discharge voltage is 9 kV and above. The joint interface tends to be generally straight, with small peaks and large wavelengths appearing in some areas. With the optimum tensile performance as the standard, the optimal process parameters are: coil turns of 3 turns, lap gap of 2 mm, lap area width of 25 mm, discharge voltage of 11 kV. The optimal joint can withstand the maximum load of 2.33 kN, up to 75% of the base metal AA1060 aluminum.

magnetic pulse joining; dissimilar sheet metal joining; aluminum-steel; numerical simulation

10.3969/j.issn.1674-6457.2022.12.016

TG391

A

1674-6457(2022)12-0146-07

2022¨C07¨C31

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