Viper chain case weldable?

[sxvipersman]

Are viper chain cases aluminum or magnesium. Need to weld small crack in outer case after upper bearing failure.

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[yamamarc]

magnesium I believe!! (sand casted )it can be tig welded but can be tricky!!

 

[Nytros rule]

magnesium I believe!! (sand casted )it can be tig welded but can be tricky!!

Doesn't Magnesium have to welded in an inert environment?