Blowtorch

A handheld burner that mixes fuel gas with air to produce a concentrated flame for heating, soldering, or brazing.

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Venturi effect: A fluid flowing through a constriction speeds up and experiences reduced static pressure. Many blowtorches use a fast fuel jet to draw air into the burner.
Soldering: A joining process that melts filler metal below the melting points of the joined parts. Small blowtorches commonly heat joints for plumbing and electronics soldering.
Oxy-fuel welding and cutting: A group of processes that use fuel gas and supplied oxygen for heating, welding, or cutting. Unlike an air-fed blowtorch, oxy-fuel equipment carries a separate oxygen supply.
Liquefied petroleum gas: A pressurized fuel mixture composed mainly of propane, butane, or both. Many portable blowtorches draw vaporized LPG from a replaceable cylinder.
Bunsen burner: A laboratory burner that mixes gas with adjustable primary air before combustion. Its adjustable air inlet illustrates premixing behind a hot, clean flame.
Brazing: A metal-joining process that uses molten filler metal above 450°C without melting the base metals. A concentrated torch flame can heat a joint to brazing temperature.
Propane torch: A portable torch that burns propane, typically mixed with air at the burner. It is a common fuel-specific form of handheld blowtorch.
Propane: A three-carbon alkane gas commonly stored as a pressurized liquid for fuel. It is a widely used fuel in portable blowtorches.
Combustion: A chemical reaction in which a fuel reacts with an oxidizer, releasing heat and often light. A blowtorch produces heat through rapid oxidation of its fuel.
Heat treatment: Controlled heating and cooling used to alter a material’s properties. A blowtorch can locally heat metal, though it offers limited temperature control.