You can make more than 50k, but most won't, will depend on the jobs you get and how steady your working, a lot of it is how much are you willing to work without time off. Rigs make good money, when...
Welding wouldn't be the best choice, more work as a fitter but once you have one its easy to get the other, you'll start at 50k a year, and be up to 100-150k as a journeyman if your willing to...