Workers in this unit group join and cut metal parts using flame, electric-arc and other sources of heat to melt and cut or to melt and fuse metal. Their functions include: welding metal parts, using gas flame, electric arc, thermite compound and other methods; operating resistance welding machines; using blow torch to make and repair lead linings, pipes, floors and other lead fixtures; brazing metal parts together; cutting metal pieces by means of a gas flame and electric arc; joining metal parts by soldering; performing related tasks.