Apprentices in Pipefitters Local 537 learn their trade in a brand new, modern training center that is the envy of all training centers in Boston and nationally. The state-of-the-art 70,000-square-foot building, which opened in 2019, includes classrooms, more than 80 welding bays, and ample space to train future pipefitters. With over 3,000 members and growing, Local 537 has consistently strived to improve the way people live and work, from training programs to job productivity and safety.