Effects of Defocus Distance on Three-Beam Laser Internal Coaxial Wire Cladding

作     者：Shaoshan Ji Fan Liu Tuo Shi Geyan Fu Shihong Shi Shaoshan Ji;Fan Liu;Tuo Shi;Geyan Fu;Shihong Shi

作者机构：School of Mechanical and Electrical EngineeringSoochow UniversitySuzhou 215000China School of Optoelectronic Science and EngineeringSoochow UniversitySuzhou 215000China. 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2021年第34卷第4期

页      面：56-77页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Supported by National Natural Science Foundation of China(Grant No.61903268) Jiangsu Provincial Natural Science Foundation of China(Grant No.BK20190823) China Postdoctoral Science Foundation Grant(Grant No.2019M661921) 

主　　题：Three beams laser Wire cladding Finite element analysis Defocus distance 

摘      要：Three-beam laser internal coaxial wire feeding cladding is regarded as a promising additive manufacturing technique because it is highly efficient and *** this study,the effects of the defocus distance on cladding using a three-beam laser with internal wire feeding are experimentally and numerically studied.A process map indicating the surface characteristics at different defocus distances with various parameter combinations was *** transmission characteristics including laser intensity,beam size,and laser spot distance of the three-beam laser at different defocus distances were analyzed using TracePro *** on the TracePro results as heat source,a three-dimensional transient finite element(FE)thermal model was formulated to predict the thermal field,temperature history and molten pool shape at different defocus distances.A molten pool with a flat bottom and low melting depth is generated when the defocus distance is−2.5 mm,whereas when this distance is−1.5 mm,a pool with a valley-shaped bond and high melting depth is *** simulated results of the temperature cycle and clad geometry are both validated and found to well agree with experimental *** influence of the defocus distance on the microstructure and microhardness are discussed based on the temperature history and cooling *** the increase in the absolute defocus distance,the height and dilution of the clad decreased,whereas the width *** addition,the effects of defocus distance with various parameter combinations on clad geometry were explored using the formulated FE model.