| METALS AND METAL MATRIX COMPOSITES |
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| Study on the Variation Patterns of Torque and Temperature Field During Friction Stir Welding and Sealing Process |
| ZHANG Changqing1,2, LIU Enrong2, WANG Dong2, WANG Yaxiong2, SHI Xiaofei2, WANG Yifan2, ZHANG Pengsheng3,*
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1 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
3 Northwest Nonferrous Metals Research Institute, Xi'an 710016, China |
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Abstract During the friction stir welding process, the frictional torque and the welding temperature field mirror the plastic deformation status of the base material. In this work, the friction stir welding of the seamless aluminum alloy pipe of 7075-T6 was performed. The frictional torque between the tool and the base material was calculated by employing the voltage and current of main shaft motor method at three different welding process parameters: friction speeds, welding speeds, and welding directions. The welding temperature was measured indirectly by converting the tempe-rature signal into an electrical signal through a K-type thermocouple and an AD8495 amplifier. The experimental findings revealed that the friction torque exhibited a characteristic trend of undergoing two distinct fluctuations before gradually stabilizing to establish a steady friction regime. Process parameters associated with reduced torque fluctuations produced welds with enhanced formation quality. Meanwhile, the peak temperature during welding was predominantly governed by process parameters, with configurations featuring the advancing side positioned internally exhibiting higher peak temperatures compared to those with externally positioned advancing sides.
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Published: 10 January 2026
Online: 2026-01-09
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2026, Vol. 40 
