Weldability Analysis of Mg/galvanized Steel Spot Plug Welded Joints with Ni-Al-Cu Cu-based Wire

doi:10.3901/JME.2016.24.052

Abstract

Abstract:

AZ31B magnesium alloys and galvanized steel sheets are joined by cold metal transfer spot plug welding process with CuAl8Ni6 Cu-based wire based filler wire. The effects of processing parameters and the diameter of the hole in the Mg sheet on mechanical properties are studied. The joining mechanism is achieved by analyzing the microstructure and distribution of elements of welded joints. The results indicate that good weld appearance can be formed for CMT spot plug welded Mg AZ31-galvanized steel joint with CuAl8Ni6 Cu-based wire. The weld metal is composed of α-Cu + CuAl₂ eutectic phases, the fusion zone is composed of amounts of brittle intermetallics Al₂Cu₃Mg₂+Mg₂Cu phases. The hole diameter in Mg sheet has a major effect on the tensile properties of the Mg-steel joints. With the increase of the hole diameter in Mg sheet, the tensile load firstly increase, then decrease. When the diameter of the hole in Mg sheet reaches 5mm, the maximum tensile load of 3.4kN can be reached. Amounts of brittle intermetallics make the tensile load of Mg-steel spot plug joints become lower.

Key words: cold metal transfer, galvanized steel, joining mechanism, tensile load, AZ31 magnesium alloy

CAO Rui, ZHU Haixia, XU Qingwei, ZHANG Haiyan, LIN Qiaoli, CHEN Jianhong. Weldability Analysis of Mg/galvanized Steel Spot Plug Welded Joints with Ni-Al-Cu Cu-based Wire[J]. Journal of Mechanical Engineering, 2016, 52(24): 52-57.

[1]	XIE Yong, WANG Xiaonan, ZHOU Xiang, LIU Zhenguang, YAO Jun, DU Baorui, BAO Chengren. Research Progress of Grain Boundary Liquid Metal Embrittlement Cracks in Galvanized Ultra-high Strength Automotive Steel Resistance Spot Welded Joints [J]. Journal of Mechanical Engineering, 2023, 59(2): 39-50.
[2]	LIU Yan, LIU Ao, ZHANG Linlin, DU Anna, LIU Zhaozhen, HE Chunlin. Study on the Porosity and Zinc Coating of CMT Welded Joints of DP590 Galvanized Dual-phase Steel [J]. Journal of Mechanical Engineering, 2023, 59(16): 213-222.
[3]	ZHANG Peng, ZHAO Shengdun, ZHANG Chuanwei, CHEN Zheng, FEI Liangyu, ZHANG Jiaying. Study on Plastic Joining Mechanism of Friction Stir Rivet Welding Using Threaded Rivet and Mechanical Properties of Its Joints [J]. Journal of Mechanical Engineering, 2022, 58(8): 126-135.
[4]	LI Jianwei, HE Zhi, LONG Jianzhou, YIN Fengliang, GAO Hongyue, ZHAO Yue, GUO Xiaolin, WANG Zhimin, LIU Yuping, ZHANG Tiejun, GUO Bin. Control of Defects in Mg Alloy Arc Additive Repair Layer by Friction Stir Treatment [J]. Journal of Mechanical Engineering, 2022, 58(4): 55-61.
[5]	NIE Huihui, ZHENG Liuwei, TIAN Jing, LIANG Wei. Edge Crack Behavior and Strengthening Mechanism of Width-limited Rolled AZ31 Magnesium Sheet with Large Reduction [J]. Journal of Mechanical Engineering, 2021, 57(8): 146-153.
[6]	SHEN Zhikang, LI Wenya, CAI Ziqiang, GE Shipeng, WU Linglu, LIU Xiaochao. Role of Sleeve Design on Weld Formation of Refill Friction Stir Spot Welded Dissimilar Al Alloys [J]. Journal of Mechanical Engineering, 2021, 57(18): 137-143,152.
[7]	CHANG Jinghuan, CAO Rui, LIN Qiaoli. Wetting and Interface Microstructures of Copper Alloy on Titanium and Steel Surfaces under Cold Metal Transfer Condition [J]. Journal of Mechanical Engineering, 2020, 56(6): 110-117.
[8]	FANG Xuewei, BAI Hao, YAO Yunfei, ZHANG Lijuan, LU Bingheng. Research on Multi-bead Overlapping Process of Wire and Arc Additive Manufacturing Based on Cold Metal Transfer [J]. Journal of Mechanical Engineering, 2020, 56(1): 141-147.
[9]	WANG Tao;CAO Rui;CHEN Jianhong;LI Jinmei. Analysis of Microstructure and Mechanical Properties for Welding Joints of Dissimilar Metals between Magnesium and Titanium by Cold Metal Transfer Method [J]. , 2014, 50(4): 75-79.
[10]	FENG Zhen;CAO Rui;CHEN Jianhong. Microstructure and Properties of Ti6Al4V-T2 Lap Welded Joints by Cold Metal Transfer Technology [J]. , 2014, 50(16): 135-139.
[11]	YAN Bingsheng;LIU Ziran;ZHANG Yuechun;TANG Baoping. Experimental Study of Early Fatigue Nonlinear Ultrasonic Detection in Magnesium Alloy [J]. , 2013, 49(4): 20-24.
[12]	HE Long;LI Cheng;ZHU Honghong. Influence of Hole Strengthening Layer on the Failure Process of Composite Material Plate with a Hole in Connection Structures [J]. , 2011, 47(12): 43-47.
[13]	ZHANG Shichang;ZONG Qin;HU Yansheng;CHENG Xiaoru. Creep Property and Mechanism of AZ31 Magnesium Alloy under High Temperature and Low Stress [J]. , 2009, 45(3): 291-295.
[14]	Zhang Hua;Wu Lin;Lin Sanbao;Feng Jicai;Guo Heping. FRICTION STIR WELDING OF AZ31 MAGNESIUM ALLOY [J]. , 2004, 40(8): 123-126.
[15]	Kang Shifang;Lu Yushen;Lu Junfang. EXPERIMENTAL INVESTIGATION ON JOINING MECHANISM OF METAL IN COLD WELDING [J]. , 1999, 35(2): 77-80.

Weldability Analysis of Mg/galvanized Steel Spot Plug Welded Joints with Ni-Al-Cu Cu-based Wire

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments