Transactions of Materials and Heat Treatment

Title：Numerical simulation and experimental study on magnetic pulse welding for sheet metal based on runway coil

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ClassificationCode：TG391

year,vol(issue):pagenumber：2024,49(2):53-61

Abstract：

A new method for sheet metal magnetic pulse welding based on runway coil was proposed. Then, the influence laws of discharge voltage, gasket spacing and flyer sheet wall thickness on the welding deformation and temperature rise of sheet were studied through numerical simulation, welding experiments and test analysis. Furthermore, the causes of welding interface defects were clarified, and the failure mechanism of Al-Al joints was revealed. The results show that the welding collision speed increases with the

increasing of discharge voltage and gasket spacing, but decreases with the increasing of flyer sheet wall thickness. The reduction of gasket spacing and the increase of flyer sheet wall thickness can improve the welding collision angle. The temperature distribution pattern of flyer sheet in the thickness direction is related to the current flow direction, and the density of induced eddy current in the curved section of runway coil is higher than that in the straight section. The micropores in the welded joint interface are caused by the “fast melting and fast solidification” of local metal, while the interstitial melt is formed by the high-temperature “particle clusters” generated by the jet flow and involved in the interface and solidified. The Al-Al welding sample undergoes the shear separation when the shear strength reaches 24 MPa, and this failure mode is caused by linear welds accompanied by micropores.

Funds：

国家自然科学基金面上项目(51975229)；湖北省重点研发计划项目（2020BAB139）；武汉市应用基础前沿项目（2020010601012178）

唐天宇（1999-），男，硕士研究生

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