Abstract:
Low density and good castability qualify magnesium alloys as an ideal structure material, especially in the automobile industry for the purpose of fuel economy and reducing the environmental impact of vehicle emission. Joining of magnesium alloy components is crucial in many applications. There has been an increasing effort in research on welding of magnesium alloys. During fusion welding of magnesium AZ91 alloy, a major technical problem has been identified: extensive melting takes place in the partially melted zone (PMZ), which is an area immediately outside the fusion boundary of the weld. This might cause liquation cracking during cooling of the weld and deteriorate the service performance of weldments, such as loss of ductility and cold cracking......
