The Blow Torch is a tool used for things such as soldering (melting metal to use as glue) and brazening (melting metal to use as glue at high temperatures). It is sometimes mistakenly thought to be used for welding when in reality a welder is used for that purpose.
In Video Games
The Blow Torch may be used by the protagonist or allied or hostile NPCs to break through doors. Also to cut through things.