Where are you and what do YOU want to do?
A business degree should give you the basics to run a small business, something that is a handy thing to have, finish the business degree IMO, you may not like welding for a living, at your stage it gives you options.
Do you want to become a journeyman welder to gain experience to run your own welding business or something else?
Location and what you want to do will taylor peoples response to your questions.
God gave man 2 heads and only enough blood to run 1 at a time. Who said God didn't have a sense of humour.....