Here is just a couple of examples of some of the exotic metals we frequently work with. The first is the repair of a crack on a titanium exhaust. These always need to be purged with argon to ensure there is no corruption on the inside! The second is a large piece of magnesium that needed holes filled. Titanium can be welded using a direct current, similar to steel/stainless steel alloys, whereas magnesium needs an alternating electrical current, like aluminum. But it is imperative that you use the correct filler rod!