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Radial Additive Friction Stir Repairing of Mechanical Hole Out of Dimension Tolerance of AZ31 Magnesium Alloy Assisted by stationary shoulder:Process and Mechanical Properties

引用

Acta Metallurgica Sinica(English Letters) 2021年第10期34卷 1345-1360页

作者： Ying-Ying Zuo Hua Liu Peng Gong Shu-De Ji Bao-Sheng Wu College of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China

Radial additive friction stir repairing(R-AFSR)assisted by stationary shoulder was put forward in the present study,which can be employed to repair the mechanical hole out of dimension tolerance of AZ31 magnesium alloy *** results show that the stationary shoulder has sealed-barrier,heat-sink and extra-forging *** heat-sink effect improves the microstructure uniformity along the stir zone(SZ)thickness and the surface appearance of repaired hole,and the sealedbarrier and extra-forging effects eliminate the super-fine grain band in the ***,these three effects improve the formation quality of repaired region,thereby enhancing the mechanical properties of repaired mechanical hole compared with conventional *** tensile and compressive shear strengths of the repaired hole by stationary shoulder R-AFSR both increase first and then decrease when the rotating speed changes from 1200 to 1800 rpm,and these maximum values,respectively,reach 190±3 MPa and 64.5±2 MPa at 1400 *** addition of stationary shoulder during R-AFSR can obtain a higher-quality repaired hole and broaden the repairing process window.

关键词： stationary shoulder Radial additive friction stir repairing Mechanical hole out of dimension tolerance AZ31 magnesium alloy Microstructure Mechanical properties

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Effect of pin rotating speed on lap shear strength of stationary shoulder friction stir lap welded 6005A-T6 aluminum alloy

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China Welding 2016年第2期25卷 58-63页

作者： Liu Zhenlei Cui Hutao Ji Shude Xu Minqiang Li Zhengwei Deep Space Exploration Research Center Harbin Institute of Technology Harbin 150080 Faculty of Aerospace Engineering Shenyang Aerospace University Shenyang 110136

stationary shoulder friction stir lap welding （SSFSLW） was successfully used to weld 6005A-T6 aluminum alloy in this paper. Effect of pin rotating speed on cross section morphologies and lap shear strength of the SSFSLW joints were mainly discussed. Results show that joints without flash and shoulder marks can be obtained by the stationary shoulder. Cross section of the SSFSLW joint presents a basin-like morphology and little material loss. By increasing the rotating speed from 1 000 rpm to 1 600 rpm, both effective sheet thickness and lap width increase, while lap shear failure load firstly decreases and then increases. The maximum failure load of 14. 05 kN /s attained when 1 000 rpm is used. All SSFSLW joints present shear fracture mode.

关键词： friction stir lap welding stationary shoulder rotating speed lap shear failure load

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维普期刊数据库

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Improving friction stir weldability of Al/Mg alloys via ultrasonically diminishing pin adhesion

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Journal of Materials Science & Technology 2018年第10期34卷 1817-1822页

作者： Xiangchen Meng Yanye Jin Shude Ji Dejun Yan Faculty of Aerospace Engineering Shenyang Aerospace University Shenyang 110136 China Department of Industrialization & Informatization Shenyang North Software Institute Shenyang 110000 China Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships CSSC Huangpu Wenchong Shipbuilding Company Limited Guangzhou510715 China

Formation of intermetallic compounds （IMCs） during friction stir welding （FSW） of alu- minum/magnesium （AI/Mg） alloys easily results in the pin adhesion and then deteriorates joint formation. The severe pin adhesion transformed the tapered-and-screwed pin into a tapered pin at a low welding speed of 30 mm/min. The pin adhesion problem was solved with the help of ultrasonic. The weldability of Al/Mg alloys was significantly improved due to the good material flow induced by mechanical vibration and the fragments of the IMCs on the surface of a rotating pin caused by acoustic streaming, respectively. A sound joint with ultrasonic contained long Al/Mg interface joining length and complex mixture of AI/Mg alloys in the stir zone, thereby achieving perfect metallurgical bonding and mechanical interlocking. The ultrasonic could broaden process window and then improve tensile properties. The tensile strength of the Al/Mg joint with ultrasonic reached 115 MPa.

关键词： Friction stir welding Ultrasonic Aluminum/magnesium alloys Pin adhesion Intermetallic compounds stationary shoulder

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