Abstract
This paper discribes the influence of the Argon and Herium contents of shielding gases on TIG arc welding in magnesium alloy extrusions. Argon and Herium mixture gases (20 to 40 He contents) are effective toget the sound beads. And at this congitions, we can get high joint efficiengy above 80%. And we made the prototype of wheelchair made by magnesium alloy extrusions using this welding technology
