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Effects of defocus distance on Three-Beam Laser Internal Coaxial Wire Cladding

Chinese Journal of Mechanical Engineering 2021年第4期34卷 56-77页

作者： Shaoshan Ji Fan Liu Tuo Shi Geyan Fu Shihong Shi School of Mechanical and Electrical Engineering Soochow UniversitySuzhou 215000China School of Optoelectronic Science and Engineering Soochow UniversitySuzhou 215000China.

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.

关键词： Three beams laser Wire cladding Finite element analysis defocus distance

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