My recommendation would be to first become a welder. Through school or on the job training. Always be a sponge and ask questions learn process and practice your skills as you learn. You can start small and grow a welding business. There many avenues on what kind of services you can offer in a welding business.
As an alternative, there are related engineering fields, such as mechanical engineering or metallurgy, that you could study in college that could help you setup a consulting style business after you worked for a while.