A heat gun is an electric heating appliance that produces a jet of hot air for melting solder, softening paint or plastic, etc. Use a micro-blower as the air source, use an electric heating wire to heat the air flow, and make the heat of the air flow reach a high temperature of 200 ℃~ 650℃, that is, the temperature of the solder can be melted, and then guide the heating through the air nozzle. Work.