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- 저자 : Lihui Pang (검색결과 3 건)
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Study on Electro-Spark Deposition Welding of Ultra-thin Sheet of Ti-6.5Al-1Mo-1 V-2Zr Alloy
Fei Liu,Tao Chen,Lihui Pang,Kuijing Song,Yucheng Wu 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.10
In this work, butt welding experiment of Ti-6.5Al-1Mo-1 V-2Zr alloy sheet of 0.5 mm thickness was performed via electro-spark deposition method. The results of the experiment indicate that the reactive titanium alloy’s surface is free from oxidation without trailing shielding protection due to low heat input and rapid thermal cycles associated with the process. The fusion zone is mainly composed of equiaxed microstructure of martensite α′ and α dual phases, wherein the amount of α′ in the central joint is higher than that adjacent to the base metal. The maximum tensile strength of the welded joint can reach 1187 MPa, which is 95% of the base metal. Besides, the joint shows obvious plastic deformation before fracture. The findings have demonstrated the possibility of widely applying the welding methodology to thin sheets of titanium alloys.
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Microstructure and Performance Study of Al/Cu Laser Welding with Ag Interlayer
Tao Chen,Fei Liu,Lihui Pang,Hao Hu,Ping Gao 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.1
In the past research, there was a gap in the field of Al/Cu dissimilar metal welding with Ag intermediate layer, and attention to the joint resistivity is insufficient. This paper has used laser welding to study this problem. The mechanical and electrical properties of the joints were tested, and the microstructure and fracture surface of the weld were observed, along with the analysis of their phase composition and formation mechanism. The results show that the Ag–Al–Cu ternary system forms on the weld, and Ag inhibits the formation of IMC in the Al/Cu system, with the main IMCs being Al2Cu and Ag3Al. Part of the Ag-rich and Al-rich phases are dispersed in small particle shape, providing a strengthening effect in various areas. After adjusting the welding parameters, excellent joints can be obtained, with a tensile strength of 98.05 MPa, which is 78.5% of the base metal, and a resistivity of 2.47 μΩ cm. The fracture occurs in the softened zone of the Al-side base metal, indicating a ductile fracture. These findings have demonstrated that good mechanical and electrical properties can be obtained by adding Ag as an intermediate layer of the joint.
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Effect of Silicon Content in Al–Si Welding Wire on Mechanical Properties of Al/Cu Laser Welded Joint
Peifeng Wang,Fei Liu,Lihui Pang,Zhe Guo 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.5
In this study, the laser welding of Al/Cu using Al–Si welding wires was analyzed. The impact of varying silicon content in the Al–Si welding wires (0%, 12%, 16%, 20%) and laser power settings ranging from 900 to 1050W in 50W increments on the phase composition, microstructure, and mechanical properties of the weld joints was investigated. It was observed that a silicon-rich interface layer formed near the copper side of the weld seam. This formation led to grain orientation and a significant reduction in grain size. As the Si content increased, the morphological structure transformed from irregularly layered dendritic to regularly oriented dendritic, and ultimately to equiaxed crystals. X-ray diffraction analysis of the weld seam revealed the presence of main intermetallic phases, including Al2Cu. It was concluded that the highest tensile strength, reaching 85.1 MPa, was achieved using an AlSi12 weld filler at a power of 900W.
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