Joining tool unit

A joining operation of a workpiece by a joining tool unit comprising a movable tool, a tool counter-element, a drive unit, a light guiding system, a light source and a control unit, wherein the movable tool and the tool counter-element are arranged on the joining tool unit opposite each other, wherein the light guiding system is configured to guide a light of the light source in the direction of a joining location of a workpiece and from above the workpiece when the workpiece is arranged on the joining tool unit, wherein the movable tool can be moved in the direction of the tool counter-element by the drive unit, wherein, in the state in which a workpiece is arranged on the joining tool unit, the workpiece is joined by a movement of the movable tool in the direction of the tool counter-element, wherein the control unit is configured to control and/or adjust the drive unit, wherein the control unit is configured to control and/or adjust the light source and/or a component of the light guiding system, wherein the joining tool unit is configured so that a movement of the movable tool in the direction of the tool counter-element is started and at the same time or chronologically afterwards irradiation or illumination of the joining location with the light of the light source is ended, wherein the control unit is configured so that irradiation or illumination of the joining location of the arranged workpiece with the light of the light source is ended before the movable tool can be introduced into a light beam of the light source during its movement in the direction of the tool counter-element, having the successive method steps of:

• arranging a workpiece which is intended to be processed on the joining tool unit,
• illuminating or irradiating a location to be joined of the workpiece by a light source of the joining tool unit,
• starting a movement of a movable tool of the joining tool unit in the direction of the location to be joined of the workpiece,
• ending the illumination or the irradiation of the location to be joined of the workpiece at the same time as the start of the movement of the movable tool of the joining tool unit in the direction of the location to be joined of the workpiece or chronologically after the start of the movement of the movable tool of the joining tool unit in the direction of the location to be joined of the workpiece in order to join the workpiece, wherein the illumination or the irradiation is ended before the movable tool can be introduced into a light beam of the light of the light source during its movement in the direction of the tool counter-element.