... with dXX, q_X, h_X three types. The meaning indicates: spot welding, braze welding, backfire welding, press this button a long ... follows).d) Stand-by state, digital indicate dXX means spot welding mode, no status block between electrodes, press (START) button to carry ... Stand-by state, digital show q_X means braze welding mode, no status block between electrodes, press (START) button to carry on ...