Biggest problem is practice weld on the material. If you don't know the composition of the material, it can go south quick.
Then there is the cleaning it up and filling the surface for a good seal at gasket. Best to make a jig that holds it together and heat the entire case piece, then weld to reduce any warpage that "will" occur.
Then there is the cleaning it up and filling the surface for a good seal at gasket. Best to make a jig that holds it together and heat the entire case piece, then weld to reduce any warpage that "will" occur.