2 answers
Scott’s Answer
There are welders that specialize in Aerospace this could include work on satellites rockets etc. As far being in outer-space, at this point you would have to work for NASA as an astronaut, however as space tourism ramps up it may be a future need. Only time will tell. If you are interested in Welding consider Under Water Welding. It pays the most and if you like to Scuba it can make a hobby into a full time profession. Also since most Astronauts train under water it might give you a leg up when Outer-Space Welding becomes the next most needed profession!!