Effect of Post-Weld Coating Process on Microstructure and Properties of 6063-T6 Aluminum Alloy MIG Welded T-Joint

XIANG Hanlin; XU Congchang; LIN Qiquan; LI Luoxing; LIN Tianhao; HUA Jiahui

doi:10.11973/jxgccl202002008

Materials and Mechanical Engineering > 2020 > 44(2): 37-42. > DOI: 10.11973/jxgccl202002008

XIANG Hanlin, XU Congchang, LIN Qiquan, LI Luoxing, LIN Tianhao, HUA Jiahui. Effect of Post-Weld Coating Process on Microstructure and Properties of 6063-T6 Aluminum Alloy MIG Welded T-Joint[J]. Materials and Mechanical Engineering, 2020, 44(2): 37-42. DOI: 10.11973/jxgccl202002008

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Effect of Post-Weld Coating Process on Microstructure and Properties of 6063-T6 Aluminum Alloy MIG Welded T-Joint

1. School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China;
2. School of Mechanical and Transportation Engineering, Hunan University, Changsha 410082, China;
3. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China

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Received Date: January 28, 2019
Revised Date: December 16, 2019

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Abstract

T-joint of 6063-T6 aluminum alloy was prepared by metal inert gas (MIG) welding and then coated. The influence of the post-weld coating process on the structure and properties of the joint was studied. The results show that the coating process had no effect on the grain morphology and size of each region of the joint. The amount of acicular β″ phase precipitation in heat affected zone increased significantly after coating. The mechanical properties of the joint were significantly improved after post-weld coating; the tensile strength was 13% higher than that before coating; the microhardness of the heat-affected zone was 18.8% higher than that before coating. The weakest area of the joint was the heat affected zone before coating, and was the weld zone after coating. Magnesium and silicon atoms were enriched in the heat affected zone to form a solute atoms-rich zone, the GP (Guinier & Preston) zone; meanwhile, the increase of acicular β″ phase precipitation disturbed the movement of dislocations, resulting in the significant increase of the hardness of the heat affected zone, and making the weld seam the weakest area of the joint.
- 6063-T6 aluminum alloy,
- coating process,
- T-joint,
- microstructure,
- mechanical property

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[1]	MILLER W S, ZHUANG L, BOTTEMA J, et al. Recent development in aluminium alloys for the automotive industry[J]. Materials Science & Engineering:A, 2000, 280(1):37-49.
[2]	FRIDLYANDER I N, SISTER V G, GRUSHKO O E, et al.Aluminum alloys:Promising materials in the automotive industry[J]. Metal Science & Heat Treatment, 2002, 44(9/10):365-370.
[3]	IMAM M, RACHERLA V, BISWAS K. Effect of post-weld natural aging on mechanical and microstructural properties of friction stir welded 6063-T4 aluminium alloy[J]. Materials & Design, 2014, 64:675-686.
[4]	IMAM M, RACHERLA V, BISWAS K, et al. Microstructure-property relation and evolution in friction stir welding of naturally aged 6063 aluminium alloy[J]. International Journal of Advanced Manufacturing Technology, 2016, 91(5/6/7/8):1-17.
[5]	AHMAD R, BAKAR M A. Effect of a post-weld heat treatment on the mechanical and microstructure properties of AA6061 joints welded by the gas metal arc welding cold metal transfer method[J]. Materials & Design, 2011, 32(10):5120-5126.
[6]	宋东福,戚文军,梁涛,等.焊后时效对6061-T6铝合金搅拌摩擦焊接头的影响[J].稀有金属,2012,36(4):535-540.
[7]	邹家生,刘欣,许祥平.6063铝合金焊接接头热处理工艺研究[J].焊接技术,2014,43(4):31-34.
[8]	欧玉春, 童忠良. 汽车涂料涂装技术[M]. 北京:化学工业出版社, 2010.
[9]	王飞. 汽车涂装工艺及涂料研究[D].西安:长安大学,2015.
[10]	马严玮,王宝雨,校文超,等.固溶时效工艺对6016铝合金力学性能的影响及多目标优化[J].工程科学学报,2017,39(1):75-80.
[11]	SATO Y S, URATA M, KOKAWA H. Parameters controlling microstructure and hardness during friction-stir welding of precipitation-hardenable aluminum alloy 6063[J]. Metallurgical and Materials Transactions A, 2002, 33(3):625-635.
[12]	王希靖,魏学玲,张亮亮.焊后时效处理对6082-T6铝合金搅拌摩擦焊接头的影响[J].材料导报,2017,31(8):62-65.
[13]	ELANGOVAN K, BALASUBRAMANIAN V.Influences of post-weld heat treatment on tensile properties of friction stir-welded AA6061 aluminum alloy joints[J]. Materials Characterization, 2008, 59(9):1168-1177.
[14]	TSAO C S, CHEN C Y, JENG U S, et al. Precipitation kinetics and transformation of metastable phases in Al-Mg-Si alloys[J]. Acta Materialia, 2006, 54(17):4621-4631.
[15]	赵志浩, 徐振, 王高松, 等. 微合金化4043铝合金焊丝焊接接头的组织与性能[J]. 金属学报, 2013, 49(8):946-952.
[16]	YAMADA K, SATO T, KAMIO A. Effects of quenching conditions on two-step aging behavior of Al-Mg-Si alloys[J]. Materials Science Forum, 2000, 331:669-674.
[17]	DUDZIK K, CHARCHALIS A. Influence of friction stir welding on hardness distribution in joints of AlZn5Mg1 alloy[J]. Solid State Phenomena, 2013, 199:430-435.
[18]	许良红, 田志凌, 彭云,等. 微量元素对高强铝合金焊缝组织和力学性能的影响[J]. 中国有色金属学报, 2008, 18(6):959-966.
[19]	彭小燕,曹晓武,段雨露,等.7020铝合金MIG焊焊接接头的组织与性能[J].中国有色金属学报,2014,24(4):912-918.
[20]	ARES A E, GUEIJMAN S F, CARAM R, et al. Analysis of solidification parameters during solidification of lead and aluminum base alloys[J]. Journal of Crystal Growth, 2005, 275(1):319-327.
[21]	HU B, RICHARDSON I M. Microstructure and mechanical properties of AA7075(T6) hybrid laser/GMA welds[J]. Materials Science & Engineering:A, 2007, 459(1/2):94-100.

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Effect of Post-Weld Coating Process on Microstructure and Properties of 6063-T6 Aluminum Alloy MIG Welded T-Joint

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