Forming Theory and Technology of Aluminum Alloy FSW Tailor Welded Blank

doi:10.3901/JME.2020.06.206

Abstract

Abstract: The aluminum alloy tailor-welding forming technology has the dual lightweight effect of material and structure, and has great application prospects under the trend of automobile lightweight development. The microstructure and mechanical properties of friction stir welding joints of aluminum alloys are studied, a finite element model of friction stir welding joints is established, and the mechanical calculation with experiments to study the plastic deformation law of friction stir welding joints is combined. The results show that the aluminum alloy FSW joint has obvious uneven mechanical properties, and the heat affected zone of the FSW joint firstly yields and necks during tensile test; post-weld heat treatment and hot forming can significantly improve the formability and mechanical properties of tailor-welded plates. For AA2024 FSW tailor-welded blanks, 450 ℃ is the optimal forming temperature. AGG is not found in the joint after solution treatment. Combining the deformation during hot stamping with the aging after forming produces a strengthening effect of deformation aging, which can obtain high-strength automotive welded components.

Key words: aluminum alloy, tailor welded blank, microstructure and properties, plastic deformation law

CLC Number:

TH162

HU Zhili, FAN Xinxin, HUA Lin. Forming Theory and Technology of Aluminum Alloy FSW Tailor Welded Blank[J]. Journal of Mechanical Engineering, 2020, 56(6): 206-212.

References

[1] 陈炜,杨继昌.拼焊板覆盖件成形过程中的焊缝移动和成形性能[J].机械工程学报,2004,40(9):62-66. CHEN Wei,YANG Jichang. Weld-bead movement and formability of tailor-welded blanks during forming auto-mobile panels[J]. Chinese Journal of Mechanical Engine-ering,2004,40(9):62-66.
[2] 刘玉山,徐安平,富大伟.基于预偏移的激光拼焊板焊缝优化补偿方法[J].机械工程学报,2012,48(16):59-63. LIU Yushan,XUN Anping,FU Dawei. Pre-offset-based approach to optimizing and compensating weld-line of tailor-welded blanks[J]. Journal of Mechanical Engineering,2012,48(16):59-63.
[3] 李淑慧,林忠钦,倪军.拼焊板在车身覆盖件冲压成形中的研究进展[J].机械工程学报,2002,38(2):1-7. LI Shuhui,LIN Zhongqin,NI Jun. Current development and trends of the tailored blank application auto-body stamping[J]. Chinese Journal of Mechanical Engineering,2002,38(2):1-7.
[4] SHAKERI H,LEE Y,WORSWICHK M. Weld failure in formability testing of aluminum tailor welded blanks[R]. SAE Technical Papers,2001-01-0090,2001.
[5] LI Yuntao,YE Juan,WANG Jinkui. Study on micro-structure and formability of laser tailor-welded joints of aluminum alloy thin sheet[J]. Advanced Materials Research,2011,239-242:876-880.
[6] LI Yuntao,ZHANG Wenjun,YANG Lijun. Laser tailor welding of aluminum alloy sheet and cup axon forma-bility of TWB[J]. Transactions of the China Welding Institution,2012,33(4):81-84.
[7] LIU Jun,WANG Ailing,GAO Haoxiang. Transition of failure mode in hot stamping of AA6082 tailor welded Blanks[J]. Journal of Materials Processing Technology,2018,257:33-34.
[8] MERKLEIN M,JOHANNES M,LECHNER M,et al. A review on tailored blanks-production,applications and evaluation[J]. Journal of Materials Processing Technology,2014,214(2):151-164.
[9] MARCO P,SAFDARIAN R,SANTOS A,et al. A study on the formability of aluminum tailor welded blanks produced by friction stir welding[J]. International Journal of Advanced Manufacturing Technology,2016,83:2129-2141.
[10] 王国庆,赵衍华.铝合金的搅拌摩擦焊接[M].北京:中国宇航出版社,2010. WANG Guoqing,ZHAO Yanhua. Friction stir welding of aluminum alloy[M]. Beijing:China Astronautic Publi-shing House,2010.
[11] CAI Biao,ZHENG Zhizhen,HE Diqiu,et al. Friction stir weld of 2060 Al-Cu-Li alloy:microstructure and mecha-nical properties[J]. Journal of Alloys and Compounds,2015,649:19-27.
[12] HU Zhili,YUAN Shijian,WANG Xiaosong. Quantitative investigation of the tensile plastic deformation charac-teristic and microstructure for friction stir welded 2024 aluminum alloy[J]. Materials Characterization,2012,73:114-123.
[13] WAN Xinyong,HU Zhili,DAI Mingliang. Plastic deformation behavior of friction stir welded tailor-welded blank of aluminum alloy[J]. Rare Metal Materials and Engineering,2017,46(11):3357-3365.
[14] AVDIN H,BAYRA A,DURGUN İ. The effect of post-weld heat treatment on the mechanical properties of 2024-T4 friction stir-welded joints[J]. Materials & Design,2010,31(5):2568-2577.
[15] CHARIT I,MISHRA R. High Strain rate superplasticity in a commercial 2024 Al alloy via friction stir process-sing[J]. Materials Science and Engineering:A,2003,359(1-2):290-296.
[16] YUAN Shijian,HU Zhili,WANG Xiaosong. Formability and microstructural stability of friction stir welded Al alloy tube during subsequent spinning and post weld heat treatment[J]. Materials Science Engineering A,2012,558(1-2):586-591.
[17] WANG Zhibiao,HE Zhubin,FAN Xiaobo,et al. High temperature deformation behavior of friction stir welded 2024-T4 aluminum alloy sheets[J]. Journal of Materials Processing Technology,2017,247:184-191.
[18] HU Zhili,PANG Qiu. Microstructure and mechanical properties of friction stir welding joint during post weld heat treatment with different zigzag lines[J]. Rare Metals,2019,38(11):1070-1077.
[19] KO D C,KO D H,KO J H. Develop-ment of a partition panel of an Al6061 sheet metal part for the improvement of formability and mechanical properties by hot forming quenching[J]. Advances in Mechanical Engineering,2017,9(2):1-15.
[20] KO D C,KO D H,KO J H. Novel method for predicting hardness distribution of hot-stamped part using FE-Simulation coupled with quench factor analysis[J]. Metall. and Materi. Trans. B,2015,46:2072.
[21] AYDIN H,BAYRA A,DURGUN İ. The effect of post-weld heat treatment on the mechanical properties of 2024-T4 friction stir-welded joints[J]. Materials & Design,2010,31(5):2568-2577.
[22] CHARINT I,MISHRA R. High strain rate superplasticity in a commercial 2024 Al alloy via friction stir process-sing[J]. Materials Science and Engineering:A,2003,359(1-2):290-296.
[23] HUMPHREYS F. Unified theory of recovery,recrystallization and grain growth,based on the stability and growth of cellular microstructures-II. The effect of second-phase particles[J]. Acta Materialia,1997,45(12):5031-5039.
[24] PANG Qiu,ZHANG Jiaheng,MOHAMMAD J,et al. Characterization of microstructure,mechanical properties and formability for thermomechanical treatment of friction stir welded 2024-O alloys[J]. Materials Science Engineering A,2019,765:138303.
[25] HU Zhili,DAI Mingliang,PANG Qiu. Influence of welding combined plastic forming on microstructure stability and mechanical properties of friction stir-welded Al-Cu alloy[J]. Journal of Materials Engineering & Performance,2018,27:4036-4042.