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| Effects of Process Parameters on Microstructure and Performance of Joints for Laser Spot Welding of Thrust Foil Bearings |
| WANG Luting1 , LUO Xinyang2 , WANG Shanlin1 , CHEN Yuhua1 , HUANG Yongde1 |
| (1. Jiangxi Key Laboratory of Forming and Joining Technology for Aviation Components, Nanchang Hangkong University, Nanchang 330000, China; 2. AVIC Jincheng Nanjing Electromechanical Hydraulic Engineering Research Center, Nanjing 211106, China) |
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Abstract The thrust foil bearing is an important support element in the aviation gyroscope. In order to improve the wear resistance and corrosion resistance of the supporting surface, Teflon coating is usually coated on the supporting surface, while the addition of this coating brings uncertainty to the subsequent manufacturing process. In this paper, the effects of laser spot welding process parameters on the microstructure and performance of thrust foil bearing joints were studied. The analysis methods such as optical microscope, scanning electron microscope, electronic precision tensile tester and ultrasonic testing were used to analyze the weld surface forming, joint microstructure and mechanical properties. The results showed that the surface diameter of joint increased with the increase of pulse power, while the tensile shear force increased first and then decreased with the increase of heat input. The optimized process parameters of laser spot welding manufacture: pulse power percentage 22%, pulse width 5.0ms, tensile shear force 63.0N; Ultrasonic immersion testing can accurately measure the size of the lap interface, but the tensile shear force was not fully proportional to the size of the interface. The tensile shear force of the joint was mainly related to the fracture modes of the joint.
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2020, 
