Mechanism for closing electrodes

A welding device comprising: - a source of force (30), - a mechanism for force transmission (41) which transmits the force of the source of force (30) and - at least two welding electrodes (24, 26 ) essentially opposite one another, which define between them a welding groove (25), of which at least one electrode (26), by a force provided by the source of force (30) can zoom in or out through the mechanism of power transmission (41) for modifying the width of the welding groove in direction (K) towards or the other electrode, wherein the welding device (18) comprises at least one lever mechanism (41) and the mechanism force transmission (41), where the lever mechanism (41) comprises a first steering system (42), rotatable about an axis of rotation of the first steering and where the lever mechanism (41) comprises additionally a second set of address (44), articulated at a first site of articulation (70) in the first management system (42) rotatably around a first rotation axis (H) and a second site joint (72) is connected rotatably about a second rotation axis (7) with the movable electrode (26), wherein the first management system (42) at a site fixed hinge (68) with respect to pieces resting the device is rotatable about an axis of rotation of the frame (G) as the axis of rotation of the first steering and also because the second management system (44) comprises a plurality of guides (441, 442) which have essentially a first common axis of rotation (H) and a common second (J) and arranged at distance from each other in the direction of the second axis of rotation (J).