Investigation of the corrosion behaviour of laser-TIG hybrid welded Mg alloys

The paper presents the corrosion behaviour of the laser–tungsten inert gas welded Mg alloy. The effects of microstructure variations of Mg alloy joint on the corrosion behaviour and reliabilities of joint are investigated. The results demonstrate that the effects of some weld defects and precipitated phases on the corrosion behaviour of weld joint are very little, and corrosion resistance of joint is predominantly influenced by grain refinement or interactions of grain refinement and continued net-shaped β phases. Moreover, the corrosion resistance of weld joints and welding mode (butt and lap joint) keep a close relation, which must not be ignored.