The present application relates to a resistance welding machine for the spot welding of metal sheets, such as the metal sheets of the vehicles. This machine comprising an electric energy generator and a clamp (11), which has a curved geometry arm (14) with respective electrodes (12, 13), located at the ends of the arm (14), between which an electric current flows when the arm (14) is actuated and the electrodes (12, 13) are brought together to compress the plates to be welded; in a portion of the arm (14) of the clamp (11) a hinge mechanism is formed, made up of a pin, the pressure of which allows an outward rotation of the clamp (11) of an end element of the arm (14), so as to considerably increase the inlet opening and perform welding even in poorly accessible areas.
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