How long does a welder go to school?

There is no schooling requirement to be a welder. However, the more education in a particular field will give you an advantage when it comes time apply for a job. If you can take a welding or general metal working class in high school it will help, and a lot of vocational schools offer one and two year programmes. These courses familiarize the student with different types of equipment and processes, as well as basic Metallurgy.