... stand-by state, short time press right middle button(↓): Power display screen shows value decrease 1, the value will jump to ... 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 ...