Oxyacetylene welding is a method of welding metals together using a jet flame. The flame burns a mixture of oxygen and acetylene gasses, and burns at around 6,000 degrees Fahrenheit.
Oxyacetylene welding requires long, protective clothing, a welding mask to protect the welder's eyes and a sufficiently large fireproof working area.
Before welding, the welder must assemble the welding rig, select a tip to use (depending on the size of flame desired) and clean out any carbon deposits left on the tip after the last use. The welder then adjusts the oxygen regulator to 10 pounds per square inch (psi) and the acetylene regulator to 5 psi, closes both gas valves, then barely opens the acetylene valve and lights the gas. The welder then slowly opens both the gas valves, adjusting the flame so it displays a yellow tip, blue center and white base.
The welder applies the flame to the connection point between the two pieces to be welded, heating them until a small portion of each melts. The welder then uses the pressure of the flame to mix the pools of molten metal, creating a weld.