Journal of Welding and Joining

6: Journal of KWJS. 2013;31(6):27-31. Published online January 21, 2014.
DOI: https://doi.org/10.5781/KWJS.2013.31.6.27; Electrode Life Test of Resistance Spot Welding on Mg Alloy Using Dome Type Electrode; Dong-Soon Choi, In-Sung Hwan^†, Dong-Cheol Kim, Moon-Jin Kang; Corresponding author: In-Sung Hwan ,Email: hisman@kitech.re.kr

Abstract: Magnesium alloy is used on parts of aircraft and electronic equipment because of the highest specific strength among the common metal materials. Recently, studies about appling magnesium alloy sheet to automotive bodies are on the increase rapidly. For application to automotive bodies, researches about characteristics of resistance spot welding of magnesium alloy sheet are essential. Magnesium alloy has low boiling point, so getting sound bead shape is difficult when appling varies welding processes. Resistance spot welding is also particular about setting optimum welding conditions because of spatter generation, pores and cracks occurrence in nugget. And life of electrodes is very short because of alloying with copper that main material of electrodes. This requires frequent dressing and replacement of electrodes and decrease in productivity of resistance spot welding on magnesium alloy. Therefore in this study, for effective analysis of changes in tensile shear load and nugget size during electrode life test, evaluate detail characteristics of resistance spot welding on magnesium alloy sheet using dome type electro

Keywords :Resistance spot welding, AZ31, Mg alloy, Dome type electrode