Study on microstructure and properties of resistance spot welding of Mg/Ti dissimilar materials

ABSTRACT The dissimilar material of AZ31 Mg alloy and TA15 Ti alloy were welded by resistance spot welding. The influence of welding current on the interface of nuggets is studied. The microstructure, hardness, tensile strength and fracture surface of joints are analysed. The results indicate that when the electrode pressure and welding time are determined, the failure load of the joint can be improved by the increase in the welding current; however, excessively high welding current will cause cracks near the interface. Under the welding current of 14.5 kA, the electrode pressure of 0.22 MPa and the welding time of 200 ms, the maximum failure load of the joint can reach 4.79 kN, which is almost the same as the shear strength of AZ31B magnesium alloy base metal.

[1]  R. Mccabe,et al.  Quantifying elastic strain near coherent twin interface in magnesium with nanometric resolution , 2020 .

[2]  Jing Liu,et al.  Microstructure and mechanical properties of Mg/Al joints welded by ultrasonic spot welding with Zn interlayer , 2019, Materials & Design.

[3]  Z. Wang,et al.  Experimental study on brazing AZ31B magnesium alloy by magnalium alloys , 2019, Welding in the World.

[4]  R. Reed,et al.  Alloys-by-design: Application to titanium alloys for optimal superplasticity , 2019, Acta Materialia.

[5]  Anilesh Kumar,et al.  Introduction to magnesium alloy processing technology and development of low-cost stir casting process for magnesium alloy and its composites , 2018, Journal of Magnesium and Alloys.

[6]  A. Gerlich,et al.  Review of research progress on aluminium–magnesium dissimilar friction stir welding , 2018 .

[7]  N. S. Kalsi,et al.  On the characteristics of titanium alloys for the aircraft applications , 2017 .

[8]  Dewang Zhao,et al.  Ultrasonic spot welding of magnesium alloy to titanium alloy , 2017 .

[9]  Xiaoyan Gu,et al.  Microstructures and mechanical properties of resistance spot welded joints of 16Mn steel and 6063-T6 aluminum alloy with different electrodes , 2016 .

[10]  Bo Chen,et al.  Microstructure and mechanical properties of laser welded-brazed Mg/Ti joints with AZ91 Mg based filler , 2016 .

[11]  Y. Zhou,et al.  Mechanical properties of dissimilar resistance spot welds of aluminum to magnesium with Sn-coated steel interlayer , 2016 .

[12]  Chuan Xu,et al.  Tungsten Inert Gas Welding–Brazing of AZ31B Magnesium Alloy to TC4 Titanium Alloy , 2016 .

[13]  A. Wu,et al.  Interface and properties of the friction stir welded joints of titanium alloy Ti6Al4V with aluminum alloy 6061 , 2015 .

[14]  J. H. Chen,et al.  Cold metal transfer welding–brazing of pure titanium TA2 to magnesium alloy AZ31B , 2014 .

[15]  K. Tang,et al.  Microstructure and mechanical properties of tungsten inert gas welded–brazed Mg/Ti lap joints , 2014 .

[16]  Y. Zhou,et al.  Microstructure and fatigue properties of Mg-to-steel dissimilar resistance spot welds , 2013 .

[17]  K. Nakata,et al.  Dissimilar metal joining of ZK60 magnesium alloy and titanium by friction stir welding , 2012 .

[18]  Ming Gao,et al.  Dissimilar Ti/Mg alloy butt welding by fibre laser with Mg filler wire – preliminary study , 2011 .

[19]  S. Bhole,et al.  Microstructure and Mechanical Properties of Fiber-Laser-Welded and Diode-Laser-Welded AZ31 Magnesium Alloy , 2011 .

[20]  Yajie Quan,et al.  Effects of heat input on microstructure and tensile properties of laser welded magnesium alloy AZ31 , 2008 .

[21]  R. Schulz,et al.  Synthesis of Mg-Ti alloy by mechanical alloying , 2003 .