| Impulse Capacitor Discharge Welding of Hollow Structure Made of Nickel-Base Alloy |
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| 作者姓名： | 王剑钊 Peter Ohse 吴甦 Ulrich Dilthey |
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| 作者单位： | Department of Industrial Engineering Tsinghua University，Welding and Joining Institute RWTH Aachen Aachen 52062 Germany，Department of Industrial Engineering Tsinghua University，Welding and Joining Institute RWTH Aachen Aachen 52062 Germany，Beijing 100084 China，Beijing 100084 China |
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| 基金项目： | Supported by the DAAD (German Academic Exchange Service)，CSC (China Scholarship Council) on Tsinghua University/ RWTH Aachen Joint Master Program |
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| 摘 要： | Future steam turbines will use hollow structures so that the turbine inlet temperature can be in- creased to improve the thermal efficiency. These hollow structures are made of the nickel-base alloy Nicro- fer 6025 HT and consist of a wire mesh between two cover sheets. The cover sheets can be joined to the wire mesh by capacitor discharge welding due to its extremely short welding duration. The goal of this re- search is to investigate suitable welding parameters so that the weld spots form in an optimum way to in- crease the tensile shear strength and reduce spattering. Tensile shear tests, three-point bending tests, and micrographs were used to judge the joint quality of structures made with various welding parameters. The results show that the best welds are obtained with a transmission ratio of 1:200, welding energy of 70% to 95%, and electrode force of 7 to 9 MPa.
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| 关 键 词： | 电容器 焊接技术 镍合金 金属学 |
| 收稿时间： | 23 August 2006 |
| 修稿时间： | 2006-08-23 |
Impulse Capacitor Discharge Welding of Hollow Structure Made of Nickel-Base Alloy |
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| WANG Jianzhao,Peter Ohse,WU Su,Ulrich Dilthey.Impulse Capacitor Discharge Welding of Hollow Structure Made of Nickel-Base Alloy[J].Tsinghua Science and Technology,2007,12(4):453-458. |
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| Authors: | WANG Jianzhao Peter Ohse WU Su Ulrich Dilthey |
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| Institution: | 1. Department of Industrial Engineering, Tsinghua University, Beijing 100084, China; 2.Welding and Joining Institute, RWTH Aachen, Aachen 52062, Germany |
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| Abstract: | Future steam turbines will use hollow structures so that the turbine inlet temperature can be in- creased to improve the thermal efficiency. These hollow structures are made of the nickel-base alloy Nicro- fer 6025 HT and consist of a wire mesh between two cover sheets. The cover sheets can be joined to the wire mesh by capacitor discharge welding due to its extremely short welding duration. The goal of this re- search is to investigate suitable welding parameters so that the weld spots form in an optimum way to in- crease the tensile shear strength and reduce spattering. Tensile shear tests, three-point bending tests, and micrographs were used to judge the joint quality of structures made with various welding parameters. The results show that the best welds are obtained with a transmission ratio of 1:200, welding energy of 70% to 95%, and electrode force of 7 to 9 MPa. |
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| Keywords: | capacitor discharge welding nickel-base alloy hollow structure tensile shear test three-point bending test micrographs |
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