Magnetic-Field-Induced Partial-to-Full Penetration Evolution and Its Mechanism During Laser Welding
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The geometry and tensile strength of magnetic-field-assisted laser-welded Ti-6Al-4V joints have been studied. Due to the effects of the magnetic field on the melt flow behavior during welding, the weld penetration depth increased from 4.27 mm (partial penetration) to 5.00 mm (full penetration) and the curvature of the weld cross-section decreased, improving the weld tensile strength. The fusion zone was enlarged, showing a maximum increase of 53.4% in area when the magnetic field intensity was 90 mT. The increased penetration depth and fusion zone area suggest that application of a magnetic field can improve the energy utilization of the laser during laser butt welding. The mechanism of the magnetic-field-induced penetration depth evolution is discussed. This study provides a new energy-saving method to obtain a full-penetration weld using laser welding at lower power.
This research was supported by the National Basic Research Program of China (2014CB046703), the China Postdoctoral Science Foundation (2017M622427), the Postdoctoral Preferential Funding Projects of Hubei Province (G14), the Major Project of Science and Technology Innovation Special for Hubei Province (2016AAA070), the National Natural Science Foundation of China (51421062), and the Huanghe special plan of outstanding talents in Wuhan.
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