Effect of Pulsed Magnetic Field Frequency on Microstructure and Properties of Al Alloy/steel CMT Welding-brazing joint

SHI Xiaohui; PU Juan; XU Xiangping; LONG Fei; RAO Jiawei

doi:10.3969/j.issn.1674-6457.2025.06.013

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 119-128. DOI: 10.3969/j.issn.1674-6457.2025.06.013

Precision Brazing

Effect of Pulsed Magnetic Field Frequency on Microstructure and Properties of Al Alloy/steel CMT Welding-brazing joint

SHI Xiaohui¹, PU Juan^2*, XU Xiangping³, LONG Fei⁴, RAO Jiawei³

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Abstract

The work aims to study the effect of different pulse magnetic field frequencies on the interface bonding quality of aluminum/steel welded joints, and realize efficient welding of aluminum/steel dissimilar metals. The butt welding of 6061 aluminum alloy test plates and Q235B steel plates was carried out by pulsed magnetic field assisted CMT welding-brazing method. The microstructure, mechanical properties and corrosion resistance of aluminum/steel joints were analyzed by optical microscope, scanning electron microscope and universal mechanical testing machine. The microstructure of the welded joint was not changed after adding the pulsed magnetic field. The weld was mainly composed of Al-Si eutectic structure and α-Al solid solution. The Al/steel interface layer was composed of θ-Fe₂(Al, Si)₅ and τ₅-Al_7.2Fe_1.8Si. As the frequency of the pulsed magnetic field increased, the grain size of the weld microstructure was refined. When the pulsed magnetic field frequency was 20 Hz, the size of the Al-Si eutectic structure was the smallest. At this time, the average tensile strength of the joint was 193.5 MPa. The pulsed magnetic field frequency affected the corrosion resistance of aluminum/steel joints. With the increase of the pulsed magnetic field frequency, the corrosion resistance of the joint increased first and then decreased. When the magnetic field frequency was 20 Hz, the corrosion resistance of the aluminum/steel joint was the best. The essence was that the pulsed magnetic field frequency affected the IMC thickness of the interface layer, and ultimately inhibited the galvanic corrosion of the joint. The frequency of the pulsed magnetic field can affect the thickness of the IMC layer at the aluminum/steel interface. Adding a suitable magnetic field frequency can further improve the bonding quality of the aluminum/steel interface, and the tensile strength and corrosion resistance of the joint can be improved.

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CMT welding-brazing / pulsed magnetic field / Al/steel dissimilar metals / microstructure / corrosion resistance

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SHI Xiaohui, PU Juan, XU Xiangping, LONG Fei, RAO Jiawei. Effect of Pulsed Magnetic Field Frequency on Microstructure and Properties of Al Alloy/steel CMT Welding-brazing joint[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 119-128 https://doi.org/10.3969/j.issn.1674-6457.2025.06.013

References

[1] 林凤涛, 王子旭, 谭荣凯, 等. 钢轨不平顺焊接区的磨耗及裂纹萌生预测[J]. 机械强度, 2025, 47(1): 146-154.
LIN F T, WANG Z X, TAN R K, et al.Wear and Crack Initiation Prediction of Rail Irregularity Welding Zone[J]. Journal of Mechanical Strength, 2025, 47(1): 146-154.
[2] XIA Y Q, MA Z, DU Q, et al.Microstructure and Properties of the TiAl/GH3030 Dissimilar Joints Vacuum-Brazed with a Ti-Based Amorphous Filler Metal[J]. Materials Characterization, 2024, 207: 113520.
[3] 秦启洞, 周临震, 周羊羊, 等. 铝合金汽车零部件铸造数值模拟研究进展[J]. 精密成形工程, 2024, 16(12): 153-163.
QIN Q D, ZHOU L Z, ZHOU Y Y, et al.Research Progress on Numerical Simulation of Aluminum Alloy Automobile Component Casting[J]. Journal of Netshape Forming Engineering, 2024, 16(12): 153-163.
[4] MA H, QIN G L, DANG Z Y, et al.Interfacial Microstructure Evolution and Mechanical Properties of Inertia Friction Welded Aluminium Alloy/Stainless Steel Joint with Preheat Treatment[J]. Materials Science and Engineering: A, 2022, 836: 142671.
[5] CARVALHO G H S F L, GALVÃO I, MENDES R, et al. Explosive Welding of Aluminium to Stainless Steel[J]. Journal of Materials Processing Technology, 2018, 262: 340-349.
[6] WANG S L, ZHOU B B, ZHANG X, et al.Mechanical Properties and Interfacial Microstructures of Magnetic Pulse Welding Joints with Aluminum to Zinc-Coated Steel[J]. Materials Science and Engineering: A, 2020, 788: 139425.
[7] GULLINO A, MATTEIS P, D’AIUTO F. Review of Aluminum-to-Steel Welding Technologies for Car-Body Applications[J]. Metals, 2019, 9(3): 315.
[8] 龙伟民, 李胜男, 都东, 等. 钎焊材料形态演变及发展趋势[J]. 稀有金属材料与工程, 2019, 48(12): 3781-3790.
LONG W M, LI S N, DU D, et al.Morphological Evolution and Development Trend of Brazing Materials[J]. Rare Metal Materials and Engineering, 2019, 48(12): 3781-3790.
[9] LONG W M, LI S N, DU D, et al.Morphological Evolution and Development Trend of Brazing Materials[J]. Rare Metal Materials and Engineering, 2019, 48(12): 3781-3790.
[10] NANDAN G, KUMAR G, ARORA K S, et al.MIG and CMT Brazing of Aluminum Alloys and Steel: A Review[J]. Materials Today: Proceedings, 2022, 56: 481-488.
[11] SHAH L H, ISHAK M.Review of Research Progress on Aluminum-Steel Dissimilar Welding[J]. Materials and Manufacturing Processes, 2014, 29(8): 928-933.
[12] LI S N, DU D, JIU Y T, et al.Brazing of C/C Composite and TiAl Alloy Using TiNiSi Filler Metal Added Cu Interlayer[J]. Journal of Materials Engineering and Performance, 2022, 31(2): 1277-1284.
[13] WALLERSTEIN D, SALMINEN A, LUSQUIÑOS F, et al. Recent Developments in Laser Welding of Aluminum Alloys to Steel[J]. Metals, 2021, 11(4): 622.
[14] SINGH S, KUMAR V, KUMAR S, et al.Variant of MIG Welding of Similar and Dissimilar Metals: A Review[J]. Materials Today: Proceedings, 2022, 56: 3550-3555.
[15] YAGATI K P, BATHE R N, RAJULAPATI K V, et al.Fluxless Arc Weld-Brazing of Aluminium Alloy to Steel[J]. Journal of Materials Processing Technology, 2014, 214(12): 2949-2959.
[16] YE Z, HUANG J H, GAO W, et al.Microstructure and Mechanical Properties of 5052 Aluminum Alloy/Mild Steel Butt Joint Achieved by MIG-TIG Double-Sided Arc Welding-Brazing[J]. Materials & Design, 2017, 123: 69-79.
[17] ÜNEL E, TABAN E.Properties and Optimization of Dissimilar Aluminum Steel CMT Welds[J]. Welding in the World, 2017, 61(1): 1-9.
[18] XU W H, HE H, YI Y Y, et al.Dissimilar Joining of Stainless Steel and Aluminum Using Twin-Wire CMT[J]. Welding in the World, 2021, 65(8): 1541-1551.
[19] CAO R, YU G, CHEN J H, et al.Cold Metal Transfer Joining Aluminum Alloys-to-Galvanized Mild Steel[J]. Journal of Materials Processing Technology, 2013, 213(10): 1753-1763.
[20] WU L J, HAN X H, WU X Y, et al.The Study of High-Speed MIG Welding Assisted by Compound External Magnetic Fields for 6N01-T6 Aluminum Alloy[J]. Journal of Manufacturing Processes, 2022, 83: 576-589.
[21] SUN Q J, LI J Z, LIU Y B, et al.Microstructural Characterization and Mechanical Properties of Al/Ti Joint Welded by CMT Method-Assisted Hybrid Magnetic Field[J]. Materials & Design, 2017, 116: 316-324.
[22] HU Y N, CHEN F R, CAO S L, et al.Preparation and Characterization of CMT Wire Arc Additive Manufacturing Al-5%Mg Alloy Depositions through Assisted Longitudinal Magnetic Field[J]. Journal of Manufacturing Processes, 2023, 101: 576-588.
[23] HU K, WEI G Q, YAN M Y, et al.Simulation of Effects of Grain Distribution Morphology on Fatigue Behavior of Short Cracks at Weld Toe (MT)[J]. Journal of Mechanical Strength, 2023(1): 84-90.
[24] LI L X, HUANG C, HAN G C, et al.Recent Progress on External Magnetic Field Assisted Laser Welding: Mechanism, Effect and Technology[J]. The International Journal of Advanced Manufacturing Technology, 2023, 125(1): 1-23.
[25] 丁浩, 徐家乐, 谭文胜, 等. 磁场对激光焊接钢/铝异种金属焊缝性能的影响[J]. 中国激光, 2017, 44(9): 105-112.
DING H, XU J L, TAN W S, et al.Influence of Magnetic Field on Properties of Fe/Al Dissimilar Metal Laser Welding Joints[J]. Chinese Journal of Lasers, 2017, 44(9): 105-112.
[26] WANG L, MA Y M, XU J, et al.Improving Spreadability of Molten Metal in MIG Welding-Brazing of Aluminum to Steel by External Magnetic Field[J]. Journal of Manufacturing Processes, 2022, 81: 35-47.
[27] 刘一搏, 张鸿名, 孙清洁, 等. 磁场作用下铝/钢CMT焊接温度场及熔池流动行为[J]. 机械工程学报, 2018, 54(2): 48-54.
LIU Y B, ZHANG H M, SUN Q J, et al.Effect of Magnetic Field on the Weld Temperature Field and Flow Behavior of Molten Pool in Al/Steel CMT Welding Process[J]. Journal of Mechanical Engineering, 2018, 54(2): 48-54.
[28] 梁百先. 电磁学教程[M]. 北京: 高等教育出版社, 1984: 65-73.
LIANG B X.Course of Electromagnetism[M]. Beijing: Higher Education Press, 1984: 65-73.
[29] PU J, CHEN T M, RAO J W, et al.Study on the Microstructure and Properties of Al Alloy/Steel CMT Welding-Brazing Joints under Different Pulse Magnetic Field Intensities[J]. Coatings, 2024, 14(12): 1515.
[30] 许凯, 侯击波, 刘雅鑫, 等. 旋转磁场对ZL205A堆焊层组织与性能的影响[J]. 热加工工艺, 2019, 48(7): 69-72.
XU K, HOU J B, LIU Y X, et al.Influence of Rotating Magnetic Field on Microstructure and Properties of ZL205A Aluminum Alloys Surfacing Layer[J]. Hot Working Technology, 2019, 48(7): 69-72.