The invention relates to an electric
welding machine which comprises a
welding machine main body and one or a plurality of detachable function operating panels, wherein the
welding machine main body comprises a power supply module and an operating control module; the function operating panel comprises a human-
machine interface module and a
panel function identifying module. The power supply model is used for supplying power to the operating control module, the human-
machine interface module and the
panel function identifying module. The human-
machine interface module and the operating control module perform bidirectional data interaction. The
panel function identifying module and the operating control module perform bidirectional data interaction. The panel function identifying module comprises a panel function identifying
chip, a
light emitting diode, three resistors and four capacitors, wherein the
light emitting diode, the three resistors and the four capacitors are connected outside the
chip. By adopting the technical scheme, the invention can realize the function consistent with the panel through replacing the function operating panels, thereby conveniently realizing the switching of multiple functions of the electric welder, not only being convenient for both the
stocking and management of the supplier but also being convenient to satisfy different function requirements of demanders.