The thrust knob has been adjusted. Christie rotates clockwise to increase thrust and counterclockwise to decrease thrust. To achieve 400d thrust, just adjust the thrust knob. The thrust adjustment of electric welding machine refers to the adjustment of thrust current, that is, when the molten iron is in short-circuit transition during welding, the electric welding machine superposes another current to make the molten iron transition smoothly and not easy to stick. The function of thrust current is to prevent jamming when the current is low. When the welding current is greater than 100A, the thrust current turns to 0, otherwise the spatter will increase.