铝合金厚板FSW焊缝成形及金属流动行为分析

doi:10.7527/S1000-6893.2016.0061

Abstract

Abstract:

7075-T6 aluminum alloys of a thickness of 20 mm are friction stir welded using a tapered pin with three flats, and the effect of process parameters on weld formation and local flow characteristic are investigated. With the increase of the rotation speed, the area of nugget increases due to the increase of the amount of plastic metal migration in unit time, and the area of loose zone decreases and even disappears. When the rotation speed is too high, the loose defect emerges again. Decreasing the welding speed appropriately can improve the weld quality by increasing the heat input in unit length, and the defect is gone. A lower welding speed causes a bigger loose zone and many internal voids because of more heat input. In the welding under appropriate parameters, more plastic materials horizontally migrate around the rotary pin with the appearance of the temporary cavity, and the "sucking-extruding" effect along the horizontal direction can thus be enhanced, improving the flowability and eliminating the internal defects.

Key words: friction stir welding, process parameters, aluminum alloy 7075, weld quality, plastic flow

CLC Number:

V252.2

MAO Yuqing, KE Liming, LIU Fencheng, CHEN Yuhua. Weld formation and material flow behavior in FSW thick aluminum alloy plates[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(11): 3546-3553.

References

[1] MAO Y Q, KE L M, LIU F C, et al. Effect of tool pin eccentricity on microstructure and mechanical properties in friction stir welded 7075 aluminum alloy thick plate[J]. Materials and Design, 2014, 62:334-343.
[2] CABIBBO M, FORCELLESE A, SIMONCINI M, et al. Effect of welding motion and pre-/post-annealing of friction stir welded AA5754 joints[J]. Materials and Design, 2016, 93:146-159.
[3] LIU X C, WU C S. Material flow in ultrasonic vibration enhanced friction stir welding[J]. Journal of Materials Processing Technology, 2015, 225:32-44.
[4] HU Z L, WANG X S, PANG Q, et al. The effect of postprocessing on tensile property and microstructure evolution of friction stir welding aluminum alloy joint[J]. Materials Characterization, 2015, 99:180-187.
[5] DORBANE A, MANSOOR B, AYOUB G, et al. Mechanical, microstructural and fracture properties of dissimilar welds produced by friction stir welding of AZ31B and Al6061[J]. Materials Science and Engineering A, 2016, 651:720-733.
[6] MIRONOV S, ONUMA T, SATO Y S, et al. Microstructure evolution during friction-stir welding of AZ31 magnesium alloy[J]. Acta Materialia, 2015, 100:301-312.
[7] MIRONOV S, MASAKI K, SATO Y S, et al. Relation between material flow and abnormal grain growth in friction-stir welds[J]. Scripta Materialia, 2012, 67:983-986.
[8] QIAN J W, LI J L, SUN F, et al. An analytical model to optimize rotation speed and travel speed of friction stir welding for defect-free joints[J]. Scripta Materialia, 2013, 68(3-4):175-178.
[9] SHARMA C, DWIVEDI D K, KUMAR P. Effect of welding parameters on microstructure and mechanical properties of friction stir welded joints of AA7039 aluminum alloy[J]. Materials and Design, 2012, 36:379-390.
[10] 李宝华, 唐众民, 鄢江武, 等. 5A06铝合金厚板搅拌摩擦焊工艺研究[J]. 热加工工艺, 2011, 40(11):152-154. LI B H, TANG Z M, YAN J W, et al. Research on friction stir welding parameters of thick 5A06 aluminum alloy[J]. Hot Working Technology, 2011, 40(11):152-154(in Chinese).
[11] XU W F, LIU J H, LUAN G H, et al. Temperature evolution, microstructure and mechanical properties of friction stir welded thick 2219-O aluminum alloy joints[J]. Materials and Design, 2009, 30(6):1886-1893.
[12] CANADAY C T, MOORE MATTHEW A, TANG W, et al. Through thickness property variations in a thick plate AA7050 friction stir welded joint[J]. Materials Science and Engineering A, 2013, 559:678-682.
[13] MAO Y Q, KE L M, LIU F C, et al. Investigations on temperature distribution, microstructure evolution, and property variations along thickness in friction stir welded joints for thick AA7075-T6 plates[J/OL]. International Journal of Advanced Manufacturing Technology, (2015-12-03)[2016-01-07]. http://link.springer.com/article/10.1007/s00170-015-8182-z/doi/10.1007/s00170-015-8182-z.
[14] 柯黎明, 潘际銮, 邢丽, 等. 搅拌针形状对搅拌摩擦焊焊缝截面形貌的影响[J]. 焊接学报, 2007, 28(5):16-20. KE L M, PAN J L, XING L, et al. Influence of pin shape on weld transverse morphology in friction stir welding[J]. Transaction of the China Welding Institution, 2007, 28(5):16-20(in Chinese).
[15] LIN Y C, LIU J J, CHEN J N. Material flow tracking for various tool geometries during the friction stir spot welding process[J]. Journal of Materials Engineering and Performance, 2013, 22(13):3674-3683.
[16] JI S D, JIN Y Y, YUE Y M, et al. Effect of temperature on material transfer behavior at different stages of friction stir welded 7075-T6 aluminum alloy[J]. Journal of Materials Science and Technology, 2013, 29(10):955-960.
[17] MIDLING O T, OOSTERKAMP L D, BERSAAS J. Friction stir welding aluminum-process and applications[C]//Proceedings of INALCO-7, 2004:161-169.
[18] 柯黎明, 潘际銮, 邢丽, 等. 搅拌摩擦焊焊缝金属塑性流动的抽吸-挤压理论[J]. 机械工程学报, 2009, 45(4):89-94. KE L M, PAN J L, XING L, et al. Sucking-extruding theory for the material flow in friction stir welds[J]. Journal of Mechanical Engineering, 2009, 45(4):89-94(in Chinese).
[19] PRANGNELL P B, HEASON C P. Grain structure formation during friction stir welding observed by the ‘stop action technique’[J]. Acta Materialia, 2005, 53(11):3179-3192.
[20] MICHAEL B P, THOMAS G H, JOHN A B, et al. Residual stress measurements in a thick, dissimilar aluminum alloy friction stir weld[J]. Acta Materialia, 2006, 54(15):4013-4021.
[21] RAJAKUMAR S, MURALIDHARAN C, BALASUBRAMANIAN V. Influence of friction stir welding process and tool parameters on strength properties of AA7075-T6 aluminum alloy joints[J]. Materials and Design, 2011, 32(2):535-549.
[22] CHEN Z W, CUI S. On the forming mechanism of banded structures in aluminium alloy friction stir welds[J]. Scripta Materialia, 2008, 58(5):417-420.

Weld formation and material flow behavior in FSW thick aluminum alloy plates

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 10

Recommended Articles

Metrics

Comments

[1]	LIU Xiaochao, ZHEN Yunqian, HE Xinyuan, CHEN Haiyan, SHEN Zhikang. Vortex- friction stir welding process based on internal friction between identical materials [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(2): 625012-625012.
[2]	JIANG Chunyang, WU Lihui, CHANG Yunlong, XUE Peng, NI Dingrui, XIAO Bolv, MA Zongyi. Hybrid welding of riveting/friction stir lap joining of aluminum alloy to resin-based composite [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(2): 625190-625190.
[3]	FENG Jicai. Research progress on dissimilar materials joining [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(2): 626413-626413.
[4]	XU Yong, YIN Kuo, XIA Liangliang, MEN Xiangnan, ZENG Yipan, ZHANG Shihong. Optimization of impact hydroforming process for aeronautical components of aluminum alloy sheets with thin wall and deep cavity [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(10): 524831-524831.
[5]	MAO Yuqing, JIANG Zhouming, LIU Fencheng, KE Liming. Microstructure evolution rule along weld thickness direction of FSW 7075-T6 aluminum alloy thick plate [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(5): 422640-422640.
[6]	MAO Yuqing, ZHAO Yida, JIANG Zhouming, KE Liming. Effect of assisted preheating temperature on weld formation of FSW of aluminum alloy thick plates [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(12): 422554-422554.
[7]	HUANG Yongxian, LYU Zongliang, WAN Long, MENG Xiangchen, CAO Jian. Review of dissimilar friction stir welding between titanium and aluminum [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(11): 22154-022154.
[8]	MAO Yuqing, KE Liming, LIU Fencheng, CHEN Yuhua. Formation mechanism of weld loose defect in friction stir welding thick plates of aluminum alloy [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(3): 420367-420367.
[9]	ZHANG Hong-wu;ZHANG Zhao;CHEN Jin-tao. Effect of Translational Velocity on Material Flow in Friction Stir Welding [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2006, 27(5): 949-956.
[10]	ZHANG Jian-feng;SHEN Yi-fu;ZHAO Jian-feng;HUANG Yin-hui;YU Cheng-ye. STUDY ON LASER SINTERING OF Ni-BASED ALLOY POWDERS [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2002, 23(3): 221-225.