brazing gas torch

black blow blowlamp blowtorch blue brass brazing burner burning butane close construction copper craftsman cutting danger dangerous degree dirty energy engineering equipment fire flame flaming flash fuel gas glowing handle heat heating hot ignite industrial industry inert iron light manual metal nozzle off old out power propane repairman retro rust safety sheet shielded skill solder soldering spark supply take technology tip tool tube utensil valve warm welder welding work