Spot Welder is used for the dentistry to remedy and repair ... circulate with dXX, q_X, h_X three types. The meaning indicates: spot welding, braze welding, backfire welding, press this button a long ... as follows).d) Stand-by state, digital indicate dXX means spot welding mode, no status block between electrodes, press (START) button ... factory or be fix by the professional personnel in time. Spot Welder