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| 1 | Applicability of unique scarf joint configuration in friction stir welding of AA6061-T6:Analysis of torque,force,microstructure and mechanical properties显示文摘The present research introduces a unique concept of scarf joint technique in friction stir welding(FSW) of aluminum alloy AA 6061-T6 plates and an investigation on weld quality.A new joint configuration with two distinct scarf angles(75°and 60°) was considered in this study.The various aspects of welding were compared with contemporary simple square butt(SSB) joint configuration.Welding was carried out at a constant tool rotation speed(TRS),tool traverse speed(TTS) and tool tilt angle of 1100 rpm,2 mm/s and2°,respectively.The results are analyzed in terms of force and torque distribution,microstructure,macrostructure,and mechanical property perspective for different joint configurations.The study reveals the minimum amount of force and torque at 60°scarf angle joint configuration compared to that of square butt joint configuration.Macro study shows that all the joints were defect-free,and a prominent onion ring was present in the lower portion of the weld nugget(WN).Fine equiaxed grains with a minimum average grain size diameter of 6.82 μm were obtained in the WN of scarf joint configuration(SJC).The maximum ultimate tensile strength(UTS) and maximum average NZ hardness of 267 MPa and83.82 HV0.1were obtained in SJC3 at a scarf angle of 60°.It has been observed from the investigation that the joint efficiency increases from 72.5%(SSB) to 86%(SJC3) at a 60° scarf angle.This unique characteristic may lay an impetus on probable joint strength enhancement technique without increasing the production cost. | Durjyodhan Sethi Uttam Acharya Shashank Shekhar Barnik Saha Roy | 2022 | Defence Technology(防务技术)2022，18，4： | 0 |
| 2 | 火箭贮箱筒段搅拌摩擦焊缝圆度影响因素研究显示文摘2219铝合金被广泛应用于新一代运载火箭贮箱结构,搅拌摩擦焊接技术因焊接性能好等优点被广泛应用于贮箱焊接。然而贮箱完成焊接后,筒段搅拌摩擦焊缝处圆度时常不理想,绝热层因此发生局部开裂现象,不满足低温绝热要求,甚至导致火箭发射失利,因此开展新一代运载火箭贮箱筒段搅拌摩擦焊缝圆度分析与研究。通过开展贮箱焊接、充压等试验以分析贮箱筒段圆度的影响因素,开展绝热试验以分析筒段圆度对绝热层的影响,同时利用有限元分析(FEA)软件ABAQUS模拟2219铝合金材料筒段充压过程分析不同筒段圆度下的最大变形量。结果表明:贮箱筒段壁板焊前自身圆度及搅拌摩擦焊接工艺特点综合导致贮箱完成焊接后筒段搅拌摩擦焊缝处圆度不理想,贮箱在总装及测试阶段经过反复充压,圆度超差较大,位置变形量较大,致使随之变形的绝热层超过自身伸长率而发生局部开裂现象。 | 韩磊 刘含伟 申雄刚 丁吉坤 杨菊鹏 | 2022 | 失效分析与预防2022，17，1： | 0 |
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