Gas welding equipment, also known as oxy-fuel or oxyacetylene welding equipment, uses oxygen and fuel gases to cut workpieces or join them together. Gas welding doesn't require electricity, unlike arc welding, and can be used to cut or weld a wide variety of metals. The oxygen and fuel gas mixture is ignited to create a high-heat flame at the tip of a gas welding or cutting torch, and the heat from the flame welds or cuts the material. Gas welding rods provide filler material for creating secure joints between two surfaces in gas welding tasks. Gas cylinders hold the gases used in the welding or cutting application, and gas regulators control the gas pressure and flow of the gases to the torch. Accessories such as gas mixers and hose reels enhance or maintain the performance of the welding equipment. Gas welders are commonly used for welding or cutting heavy metal workpieces such as aircraft, automobiles, pipe, and building materials.