Aluminum element effect for electron beam welding of similar and dissimilar magnesium–aluminum–zinc alloys

Defects causing stress concentration from electron beam welding are related to the Al content of the Mg–Al–Zn weldment and its effect will be most conspicuous for the welding of dissimilar metals. Precipitates which are γ phase (Mg17(Al,Zn)12) also influence the formative mechanism of pores, the heat-affected zone and the fracture mode of the weld. More noteworthy is that the Al content of 6.0 wt.% is a very important delimitation for these mechanisms.