A MAPP (methylacetylene-propadiene propane) torch is a type of portable flame device that is used to heat various objects. A MAPP torch can get much hotter than a propane torch and therefore is very useful for various applications. MAPP torches are most often used for welding, soldering and brazing pipes. Using a MAPP torch is similar to using a propane torch. Careful precautions must always be taken because the torch can get up to 5300 degrees Fahrenheit.
Set the MAPP can upright on a flat surface and turn the valve on the top to open the tank and release gas. Stop turning when you hear the gas seeping out.
Flick on the lighter and hold it at the end of the nozzle until the flame ignites. Pull your hand and the lighter away immediately when it ignites.
Adjust the movable end of the nozzle by turning it in either direction. This will allow more or less air to flow through and mix with the MAPP gas. Adjust the valve on the top of the can to allow more gas to flow and make the flame hotter. When the flame is blue, it is the hottest.
Position the torch next to the pipe joint or object you will be welding. Hold one end of the pipe using the pliers. Move the flame so the tip is barely touching the pipe. Move it around from side to side along the entire diameter of the pipe.
Continue welding until the pipe has been sweated on to the other. Turn off nozzle to stop the flame from coming out and wait for the pipes to cool down before touching them.