The effects of faying surface condition, pre-existing pores in base material and cover plate on the pore formation during resistance spot welding of magnesium alloy were investigated. The results reveal that the hydrogen rejection and the pre-existing pores in base material have little effect on the pore formation, and that the larger pore formation is mainly caused by shrinkage strain during resistance spot welding of magnesium alloy.
ZhaoH. and DebroyT.:‘Pore formation during laser beam welding of die-cast magnesium alloy AM60B – mechanism and remedy’, Weld. J., 2001, 80, (8), 204s–210s.
2.
MasoudH., BlairC. and RadovanK.:‘Dual-beam laser welding of AZ31B magnesium alloy in zero-gap lap joint configuration’, Opt. Laser Technol., 2014, 56, 247–255.
3.
LiC. and LiuL.:‘Investigation on weldability of magnesium alloy thin sheet T-joints: arc welding, laser welding, and laser-arc hybrid welding’, Int. J. Adv. Manuf. Technol., 2013, 65, 27–34.
4.
LiuL., SongG., LiangG. and WangJ.:‘Pore formation during hybrid laser–tungsten inert gas arc welding of magnesium alloy AZ31B – mechanism and remedy’, Mater. Sci. Eng. A, 2005, A390, 76–80.
5.
MikuckiB. A. and ShearouseJ. D.III:Proc. Conf. on ‘Magnesium properties and applications for automobiles’, Detroit, MI, USA, March 1993, Society of Automotive Engineers Inc., 107–115.
6.
HaferkampH., BachF. W., BurmesterI., KreutzburgK. and NiemeyerM.:Proc. 3rd Int. Magnesium Conf., Manchester, UK, April 1996, The Institute of Materials, 89–98.
7.
WahbaM., MizutaniM., KawahitoY. and KatayamaS.:‘Laser welding of die-cast AZ91D magnesium alloy’, Mater. Des., 2012, 33, 569–576.
8.
MaryaM. and EdwardsG. R.:‘The laser welding of magnesium alloy AZ91’, Weld. World, 2000, 44, 31–37.
9.
SatonakaS., IwamotoC., MurakamiG. and MatsumotoY.:‘Resistance spot welding of magnesium alloy sheets with cover plates’, Weld. World, 2012, 56, (7/8), 44–50.
10.
QiuR. F., SatonakaS. and IwamotoC.:‘Mechanical properties and microstructures of magnesium alloy AZ31B joint fabricated by resistance spot welding with cover plates’, Sci. Technol. Weld. Join., 2009, 14, (8), 691–697.
11.
Kishore BabuN., BrauserS., RethmeierM. and CrossC. E.:‘Characterization of microstructure and deformation behaviour of resistance spot welded AZ31 magnesium alloy’, Mater. Sci. Eng. A, 2012, A549, 149–156.
12.
WilliamN. T. and ParkerJ. D.:‘Review of resistance spot welding of steel sheets. Part 1: modelling and control of weld nugget formation’, Int. Mater. Rev., 2004, 49, (2), 45–75.
