Hot air gun is a tool that uses the hot air blown from the gun core of heating resistance wire to weld and pick up components. It is mainly composed of air pump, air flow stabilizer, linear circuit board, handle, shell and other basic components. The hot-air guns mainly include high-speed hot-air guns, constant temperature hot-air guns, digital display hot-air guns, etc. they are one of the important tools for the maintenance of communication equipment. The process requirements are very high. They can be widely used in petroleum, chemical industry, machinery, mining, metallurgy, hardware, electronics, food and other fields.