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Microstructure and mechanical properties of friction pull plug welding for2219-T87 aluminum alloy with tungsten inert gas weld

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1216-1224页

作者： Zhen Shao Lei Cui Lijun Yang Peng Lu Huimiao Wang Zhuanping Sun Jianling Song Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Tianjin Space Launch Vehicle Manufacturing Co.Ltd Tianjin 300457China

The friction pull plug welding(FPPW)of the 2219-T87 tungsten inert gas(TIG)welded joint was investigated,and the microstructures,precipitate evolution,mechanical properties,and fracture morphologies of this joint were analyzed and *** this study,defectfree joints were obtained using a rotational speed of 7000 r/min,an axial feeding displacement of 12 mm,and an axial force of 20-22 *** results indicated that within these welding parameters,metallurgical bonding between the plug and plate is achieved by the formation of recrystallized *** microstructural features of the FPPW joint can be divided into different regions,including the heat-affected zone(HAZ),thermomechanically affected zone(TMAZ),recrystallization zone(RZ),heat-affected zone in the TIG weld(TIG-HAZ),and the thermomechanically affected zone in the TIG weld(TIG-TMAZ).In the TIG-TMAZ,the grains were highly deformed and elongated due to the shear and the extrusion that produces the plug during the FPPW *** main reason for the softening in the TMAZ is determined to be the dissolution ofθ’and coarsening ofθprecipitate *** a tensile test,the FPPW joint welded with an axial force of 22 kN showed the highest ultimate tensile strength of 237 *** locations of cracks and factures in the TIG-TMAZ were *** fracture morphology of the tensile sample showed good plasticity and toughness of the joints.

关键词： friction pull plug welding tungsten inert gas weld microstructures constituent particles mechanical properties

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Improving the Weld Formation and Mechanical Properties of the AA-5A06 friction pull plug Welds by Axial Force Control

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Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 828-838页

作者： Jinyong Gao Lijun Yang Lei Cui Peng Lu Jun Yang Yanjun Gao Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Capital Aerospace Machinery Corporation Beijing 100044China

In the present study, the weld formation and mechanical properties of the AA-5A06 friction pull plug welded(FPPW) joints were improved by controlling the axial force history. Several defect-free FPPW joints were made successfully by using the welding parameters of 15–20 k N/s axial loading rate, 20–30 k N axial welding force and 6–7 mm axial feeding displacement. The results indicated that using higher axial loading rate and axial welding force produced more stable heat generation and shorter frictional heating time between the frictional interface. In this case, the plastic flow of the materials around the hole could be further improved since the axial feeding displacement of the plug was increased. The maximum ultimate tensile strength(UTS) and elongation of the FPPW 5A06 joints were 314 MPa and 4.8%, respectively. The thermal mechanically affect zone(TMAZ) had the lowest hardness value throughout the joint and was found as the fracture location to all the tensile samples. The softening of TMAZ was mainly caused by the weakening of the cold work hardening and the coarsening of grains.

关键词： friction pull plug welding Parameter optimization Microstructures Mechanical properties

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