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Affiliation of Author(s):材料科学与技术学院

Title of Paper:Fracture mechanism on Al-Li alloy T-joint welded by dual laser-beam bilateral synchronous welding

Journal:Proc Inst Mech Eng Part B J Eng Manuf

Abstract:Dual laser-beam bilateral synchronous welding technique is considered to replace riveting in terms of skin–stringer joints. The 2.0-mm thick Al-Li alloy T-joint, which is welded by dual laser-beam bilateral synchronous welding between 2099-T83 stringer and 2060-T8 skin, is investigated in the current study. Under the tailored process conditions, the examinations and analyses of microstructures, microhardness distribution, hoop tensile mechanical properties, and fractographies of the T-joint are conducted. Experimental results show that the maximum tensile strength of the weld seam is up to 85% of the tensile strength of the skin material. In order to explore the special fracture characteristics of dual laser-beam bilateral synchronous welding joints after tensile test, a three-dimensional finite element model is established and the residual stress of the weldment is analyzed. Considering the scanning electron microscopy results and simulation results comprehensively, stress concentration is the main reason for the weldment failure in tensile test. © IMechE 2018.

ISSN No.:0954-4054

Translation or Not:no

Date of Publication:2019-08-01

Co-author:夏令,吴友发,余海松,fengxiaosong,夏佩云

Correspondence Author:Xiaohong Zhan