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Affiliation of Author(s):材料科学与技术学院

Title of Paper:Study on 2219 aluminum alloy T-joint during dual laser-beam bilateral synchronous welding: Effect of the welding speed and incident beam angle on grain morphology

Journal:Opt Laser Technol

Abstract:The 2219 aluminum alloy T-joints consisting of 4 mm thick stringer and 3.5 mm thick skin with preset double bosses were fabricated by dual laser-beam bilateral synchronous welding (DLBSW) in this investigation. The effect of the welding speed and the incident beam angle on the grain morphology including grain size on one-dimensional (1D) and two-dimensional (2D) scales were studied in detail. The microstructure of different regions of T-joint were identified using optical microscopy (OM). The width of non-dendritic equiaxed zone (EQZ) and the columnar dendrites grain size Zl were measured and quantitatively studied on 1D scale, while the grain size Zs of EQZ and the equiaxed dendrites on 2D scale. The results show that the grain morphology of different regions of the T-joint is significantly different due to the difference of welding heat input and cooling rate. The grain size Zs of EQZ and equiaxed dendrites crystal zone increase as the welding speed increase, while decrease as the incident beam angle increase. The grain size Zl of columnar dendrites increase as the heat input decreases. © 2019 Elsevier Ltd

ISSN No.:0030-3992

Translation or Not:no

Date of Publication:2019-11-01

Co-author:刘婷,赵艳秋,白沐炎,龚星如

Correspondence Author:Xiaohong Zhan