The link above is very helpful. You can also look at joining an organization that offers Apprenticeship programs in fields like Welding, Painting, Carpentry. These companies usually have a commitment to help grow the specialty careers like Welding so they officer Apprenticeships where you will work in that field and have tutored classes in a local school. What's cool about this is that you get paid while in the program! you graduate as a 3rd or 2nd class Mechanic in your chosen firld. Welders are in high demand in the US but this is a high paying job. You can also look into Triple X (XXX) Specialty Welding.
What to Expect as an Apprentice
While every apprenticeship program varies, with a welding apprenticeship you should expect hands-on training working with welding equipment. You should also expect to assist welders on the job by moving equipment, tools and supplies, or holding or clamping work pieces while welding is being done. At the same time, you will be expected to be eager and willing to learn from a qualified journeyman welder, follow standard safety practices, act professionally and be drug free at all times.
Some employers, like Ingalls Shipbuilding, offer full-fledged apprenticeship schools, where hands-on training is combined with classroom instruction for a period of two to four years, to earn your welding certification, all while you are being paid.
Ship Repair/Ship Building companies offer the apprenticeship mentioned.
Other helpful links: