... . It uses advanced PID control technology, and adjust the power to make the temperature more constant automatically,the fluctuation is ... Video CD4. Manual5. WrenchParts of hot air welding machine1. Power button 2. Power jack 3. Operation handle Gliding wheel handle 4. Temperate knob ... the air inlet with soft bristle brush.3. Check the power cord and plugs to avoid any mechanical damage. Automatic ...