... result in lots of problems about exploding.In all of our products, there is an Air Regulator knob, the way how to use will be ... the actual situation. Adjustment method,use north bridge on mainboard of notebook or PC(use the waste board to adjust, but must keep PCB ... very simple principle, all of welding equipments by hot air keep to this rule. When welding small chip, use the smaller tuyere, adjust ...