The type of gas used in a blowtorch is not as important as the completeness of the combustion. Propane, butane, MAPP, and acetylene are all good choices. The type of flame produced by a torch depends on the gas used. An oxidizing flame contains excess oxygen, either from the surrounding air or from compressed oxygen. The flame is dark blue and relatively short, and is the most desirable for welding.

Professional blowtorches typically use an oxyacetylene-oxygen mix. However, these are volatile and can explode if not used properly. The gas is dissolved in acetone but is still very volatile. For use under water, the torch can be used with methylacetylene-propane (MAPP) gas. This type of fuel is more stable than oxyacetylene, but is not waterproof.

Liquid propane (LPG) is another option for gas blowtorches. These torches operate by passing a vaporized tube through a flame. They have a large flared base and are usually fed by compressed oxygen. Unlike gasoline, liquid propane does not burn hot. Because water is vaporized during the combustion process, the torch body is not heated. This means that a water-fueled blowtorch can be used safely on metals that are sensitive to heat. A prototype is currently being tested by welders in the UK and will be available to the general public in the future.

Gas blowtorches are relatively simple machines. They consist of a gas cylinder with a portion of oxygen and fuel. The torch tip and regulators are attached to the handle of the torch. The tip is made of several holes that allow many flames to emerge and heat a large surface area of metal very quickly. When you're finished with a job and need to move on to the next phase, a gas-burning blowtorch is the perfect tool.

Gas blowtorches are generally made of a fuel cylinder and an oxygen tank. The gas cylinder can be purchased separately. A kerosene-fueled blowtorch has two gas regulators. The regulator controls the pressure and the flow of the gas. It must be adjusted to prevent explosions and other problems. A high-pressure cylinder should be set in order to prevent a low-pressure flame.

The main components of a gas blowtorch are the torch head and the tip. The torch head has two needle valves, one for oxygen and one for fuel. A torch tip has a cylinder with the fuel. The fuel is stored in the fuel cylinder. The torch should be protected from water. A safety valve should be installed on a flametorch. The valve should be protected against accidental ignition.

The cylinder should have a two-stage regulator. Most blowtorches use a single-stage regulator. A two-stage regulator is better than a single-stage regulator. This is the type that can be used to pre-heat a large cast. It has an exhaust that is designed to protect the work area from a flashback. The nozzle should be fitted with a safety-certified air cylinder.