A blow lamp produces a hot flame which can vary between 100 and 2200 degrees Celsius (212 and 3992 degrees Fahrenheit) depending on the type of gas used. The flame is fuelled by the gas contained in the canister attached to the blow lamp.
The gas is under pressure inside the canister and, when released by turning a knob, blows through to the nozzle of the blow lamp.
The gas enters the burner through a small hole or jet. The gas is then ignited by a spark caused when the user presses an ignition button on the blow lamp, or by a match or lighter. When the gas and air mix in the burner, the gas becomes oxygenated, which results in a hotter flame.
A single flame from a blow lamp has a range of temperatures within it. The hottest area of the flame is where the more intense inner flame meets the less distinct outer flame.
The hottest part of the flame is then placed next to or on the material to be joined, for example when melting solder onto a copper pipe.
