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Affiliation of Author(s):材料科学与技术学院

Title of Paper:Effect of external applied steady magnetic field on the morphology of laser welding joint of 4-mm 2024 aluminum alloy

Journal:APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

Key Words:SOLIDIFICATION KEYHOLE SURFACE FLOW MELT

Abstract:Additional external steady magnetic fields were applied to investigate the influence of a steady magnetic field aligned perpendicular to the welding direction during laser beam welding of 2024 aluminum alloy. The flow pattern in the molten pool and the weld seam geometry were significantly changed by the induced Lorentz force distribution in the liquid metal. It revealed that the application of a steady magnetic field to laser beam welding was helpful to the suppression of the characteristic wineglass-shape and the depth-to-width ratio because of the Marangoni convection. The microstructures and component distributions at various laser power and magnetic field intensity were analyzed too. It was indicated that the suppression of the Marangoni convection by Lorentz force was beneficial to accumulation of component and grain coarsening near the fusion line.

ISSN No.:0947-8396

Translation or Not:no

Date of Publication:2017-01-01

Co-author:Zhou, Junjie,Sun, Weihua,Chen, Jicheng,Wei Yanhong

Correspondence Author:Xiaohong Zhan