Resistance welding device having a stationary electrode and a movable electrode between a working position and two distinct resting positions

A resistance welding device comprising:

• a clamp to support an arm including a first part supporting a stationary electrode and a second part supporting a translationally movable electrode, the electrodes being configured to be passed through by an electrical current and positioned to clamp metal elements in order to weld them, the movable electrode being movable between:
• a working position wherein the electrodes clamp the metal elements to be welded,
• a first opening position making it possible to insert, between the electrodes disposed opposite one another, the metal elements to be welded wherein the movable electrode is in a first resting position and located at a first distance from the stationary electrode, and
• a second opening position making it possible to insert, between the electrodes disposed opposite one another, the metal elements to be welded wherein the movable electrode is in a second resting position and located at a second distance from the stationary electrode, greater than the first distance;
• a block, which blocks the movable electrode in the first resting position;
• and
• an actuator which acts on the block to permit the movement of the movable electrode to the second resting position under an effect of a return element.