A blow torch is a tool used to produce an intense and focused flame for various purposes, including welding, soldering, and heating. Synonyms for "blow torch" include welding torch, soldering torch, gas torch, propane torch, and oxy-acetylene torch. A welding torch is used primarily for welding metals, while a soldering torch is used to heat and join metals together. A gas torch can be used for various purposes, such as cooking, thawing frozen pipes, and in jewelry making. A propane torch is used for soldering, brazing, and welding, whereas an oxy-acetylene torch is used for cutting, welding, and brazing tasks. Overall, these synonyms are interchangeable depending on the type of task or material being worked on.