The term "boilermaker" can be used to describe a welder who specializes in building boilers. Boilermakers are responsible for welding pipes together and maintaining them. Boilermakers weld pipes together and maintain them. They also assemble, install, and repair boilers and other equipment that use steam or hot water as a power source. The job of a boilermaker is often dangerous because they work with high temperatures and often operate in areas without much visibility.