A plasma torch is a device that uses high heat to cut through or melt metal by creating and directing a stream of superheated ionized gas called plasma. Full definition
The Welding room was glowing with the azure, electric - white glow from plasma torches ripping through metal. (edutopia.org)
At the plant, garbage will be superheated to more than 10,000 degrees Fahrenheit — about the temperature of the sun's surface — by a NASA - developed plasma torch. (discovermagazine.com)
So plasma torches can generate regions of great heat, but the electrical characteristics are problematic, mostly because of the need to have large amounts of electrical current flow and because lightsabers don't seem to have that characteristic. (scientificamerican.com)