Blowtorches, often referred to as torches, were portable tools designed to generate a flame. Approximately around 9 ABY, a human youngling named Wim assisted another human youngling, KB, in swapping out a decayed micro-fuse within her augs. He accomplished this by employing a blowtorch to liquefy servomotor wires inside a container, effectively fabricating a replacement.
The initial appearance of blowtorches within Canon occurred in the novel titled Aftermath, authored by Chuck Wendig and published during 2015.
Prior to this, within the Star Wars Legends continuity, they were initially depicted as weapons mounted on droid units.