机械振动辅助铝合金MIG焊接接头组织与性能研究

茅卫东; 石铭霄; 李盛良; 李敬勇; 陈书锦; 陈九公

doi:10.7512/j.issn.1001-2303.2022.10.02

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机械振动辅助铝合金MIG焊接接头组织与性能研究
Microstructure and Properties of Mechanical Vibration-Assisted MIG Welded Joint of Aluminum Alloy
2022年52卷第10期页码：9-14
收稿：2022-09-26，

纸质出版：2022-10-20
DOI： 10.7512/j.issn.1001-2303.2022.10.02
稿件说明：

移动端阅览

茅卫东，石铭霄，李盛良，等.机械振动辅助铝合金MIG焊接接头组织与性能研究［J］.电焊机，2022，52（10）：9-14. DOI： 10.7512/j.issn.1001-2303.2022.10.02.

MAO Weidong, SHI Mingxiao, LI Shengliang, et al.Microstructure and Properties of Mechanical Vibration-Assisted MIG Welded Joint of Aluminum Alloy[J].Electric Welding Machine, 2022, 52(10): 9-14. DOI： 10.7512/j.issn.1001-2303.2022.10.02.

摘要

MIG焊是新能源汽车铝合金车身的主要连接工艺，但铝合金MIG焊接存在接头软化、焊缝极易出现气孔等问题，给铝合金车身结构焊接质量管控带来了严峻挑战。为了改善铝合金MIG焊的接头质量，将机械振动作为外部激励引入到铝合金MIG焊接过程中，采用光学显微镜和扫描电子显微镜观察接头微观组织，采用电子背散射衍射仪确定焊缝和热影响区的晶粒大小，采用X射线探伤仪检测接头中的气孔数量，使用维氏硬度计测试接头显微硬度，在电子万能试验机上进行室温拉伸试验，研究振动频率对焊缝成形、气孔分布、显微组织及力学性能的影响。结果表明，机械振动能有效细化焊缝晶粒，减少焊缝气孔数量，增大熔深，提升接头强度和硬度，提高铝合金的焊接质量。并且随着振动频率增加，焊缝晶粒尺寸和气孔数量逐渐减小，熔深及接头的抗拉强度和硬度逐步增加。

Abstract

MIG welding is a primary joining process for car body structure of aluminum alloy involved in the electric cars

but there are some problems such as joint softening and great tendency to form pores in the weld

which brings severe challenges to the quality control of aluminum alloy car body structure welding. Acting as an external excitation

mechanical vibration was introduced into the MIG welding process of aluminum alloy to improve the quality of welded joint. The microstructure of the welded joint was observed by optical microscope and scanning electron microscope. The grain sizes of weld and heat affected zone were determined by electron backscatter diffractometer. The number of pores in the weld was detected by X-ray detector. The microhardness of joints was tested by a Vickers-type microhardness tester. The tensile test at room temperature was carried out on electronic universal testing machine to study the effect of vibration frequency on weld appearance

pore distribution

microstructure and mechanical properties. The results show that mechanical vibration can effectively refine the grains of the weld

reduce the number of pores in the weld

increase the penetration

and improve the strength and hardness of the joint. In addition

as the vibration frequency increases

the grain size of the weld and the number of pores in the weld gradually decrease

the penetration

tensile strength and hardness of the joint continuously increase.

关键词

Keywords

references

Yi J ， Zhang J M ， Cao S F ， et al . Effect of welding sequence on residual stress and deformation of 6061-T6 aluminium alloy automobile component ［J］. Transact-ions of Nonferrous Metals Society of China ， 2019 ， 29 （ 2 ）： 287 - 295 .

Zhang Y M ， Pan C ， Male A T . Improved microstructure and properties of 6061 aluminum alloy weldments using a double-sided arc welding process ［J］. Metallurgical and Materials Transactions A ， 2000 ， 31 ： 2537 - 2543 .

陈琪昊，崔山成，林三宝，等 . 超声频脉冲电信号耦合前后铝合金TIG堆焊接头特点［J］. 焊接学报， 2020 ， 41 （ 10 ）： 42 - 46 .

Chen Q H ， Cui S C ， Lin S B ， et al . Characteristics of TIG overlaying welded joints of aluminum alloy before and after implementing ultrasonic frequency pulse electric signal ［J］. Transactions of The China Welding Institution ， 2020 ， 41 （ 10 ）： 42 - 46 .

乔建毅 . 轨道客车常用铝合金5083、6082 MIG焊接工艺研究［D］. 长春：吉林大学， 2017 .

Qiao J Y . Study on MIG welding process of aluminum alloy 5083、6082 used in railway vehicles ［D］. Changchun ： Jilin University ， 2017 .

李熠 . 2219铝合金双丝MIG焊工艺研究［D］. 杭州：浙江大学， 2004 .

Li Y . Research on double-wire MIG welding of 2219 aluminum alloy ［D］. Hangzhou ： Zhejiang University ， 2004 .

Wang D ， Zhang C S ， Wang C X ， et al . Application and analysis of spread die and flat container in the extrusion of a large-size，hollow，and flat-wide aluminum alloy profile ［J］. The International Journal of Advanced Man- ufacturing Technology ， 2018 ， 94 ： 4247 - 4263 .

Choi M ， Wu C ， Kim J W . Numerical optimization of the welding sequence for mitigating welding deformation in aluminum pipe structures by using a genetic algorithm ［J］. International Journal of Precision Engineering and Manufacturing ， 2020 ， 21 ： 2323 - 2333 .

Wang T H ， Komarasamy M ， Liu K M ， et al . Friction stir butt welding of strain-hardened aluminum alloy with

high strength steel ［J］. Materials Science and Engineering：A ， 2018 ， 737 ： 85 - 89 .

Wang X J ， Sun W ， Chen J F ， et al . Microstructures and properties of 6016 aluminum alloy with gradient composition ［J］. Rare Metals ， 2021 ， 40 （ 8 ）： 2154 - 2159 .

Malopheyev S ， Vysotskiy I ， Kulitskiy V ， et al . Optimization of processing-microstructure-properties relationship in friction-stir welded 6061-T6 aluminum alloy ［J］. Rare Metals ， 2016 ， 662 ： 136 - 143 .

Liu Z Y ， Xiong B Q ， Li X W ， et al . Deep drawing of 6A16 aluminum alloy for automobile body with various blank-holder forces ［J］. Materials Science & Engineering A ， 2019 ， 38 （ 10 ）： 946 - 953 .

贺地求，胡雷，赵志峰，等 . 超声功率对2219-T351铝合金搅拌摩擦焊接头组织与性能的影响［J］. 焊接学报， 2020 ， 41 （ 3 ）： 23 - 28 .

He D Q ， Hu L ， Zhao Z F ， et al . Effect of ultrasonic power on microstructure and properties of 2219-T351 aluminum alloy friction stir welding joint ［J］. Transactions of The China Welding Institution ， 2020 ， 41 （ 3 ）： 23 - 28 .

张满，夏之穹，张临财，等 . Zn-Al钎料钎焊6063铝合金铺展性能及接头断裂机理分析［J］. 焊接学报， 2015 ， 36 （ 8 ）： 63 - 66 .

Zhang M ， Xia Z Q ， Zhang L C ， et al . Spreadability of Zn-Al filler metal and fracture mechanism of 6063 Al-alloy brazed joint ［J］. Transactions of The China Welding Institution ， 2015 ， 36 （ 8 ）： 63 - 66 .

Casalino G ， Mortello M ， Leo P ， et al . Study on arc and laser powers in the hybrid welding of AA5754 Al-alloy ［J］. Materials and Design ， 2014 ， 61 ： 191 - 198 .

Baskutis S ， Žunda A ， Kreivaitis R . Mechanical properties and microstructure of aluminium alloy AW6082-T6 joints welded by double-sided MIG process before and after aging ［J］. Mechanika ， 2019 ， 25 （ 2 ）： 107 - 113 .

Tian Y B ， Shen J Q ， Hu S S ， et al . Effects of ultrasonic vibration in the CMT process on welded joints of Al alloy ［J］. Journal of Materials Processing Technology ， 2018 ， 259 ： 282 - 291 .