Abstract: A joining tool unit including a hold-down device, a linearly movable tool, and a tool counter element. The hold-down device and the tool counter element are provided opposite each other, a workpiece lies on the tool counter element when the workpiece is arranged on the joining tool unit, and the hold-down device is arranged to be supported on a surface of the workpiece. The hold-down device has a light-guiding system, and the light-guiding system is designed to guide a light beam of a light in the direction of a joint location of the workpiece when the workpiece is arranged on the joining tool unit. The light-guiding system is provided on the hold-down device such that the light beam is irradiated onto the joint location solely at an angle which is greater than 0° relative to a movement axis of the linearly movable tool.

Abstract: A joining tool unit including a hold-down device with a movable tool and a tool counter element. The hold-down device together with the movable tool and the tool counter element are provided opposite each other. A workpiece can be positioned between the hold-down device and the tool counter element in the arranged state. The movable tool and the tool counter element interact in order to form a joint connection. A light-guiding system is formed on the hold-down device, to conduct a light beam in the direction of a joint location of the workpiece when the workpiece is arranged on the joining tool unit. A flow channel for a fluid is defined along a section of the light beam up to a workpiece-side end of the hold-down device.

Abstract: A joining tool unit including a hold-down device, a linearly movable tool, and a tool counter element. The hold-down device and the tool counter element are provided opposite each other, a workpiece lies on the tool counter element when the workpiece is arranged on the joining tool unit, and the hold-down device is arranged to be supported on a surface of the workpiece. The hold-down device has a light-guiding system, and the light-guiding system is designed to guide a light beam of a light in the direction of a joint location of the workpiece when the workpiece is arranged on the joining tool unit. The light-guiding system is provided on the hold-down device such that the light beam is irradiated onto the joint location solely at an angle which is greater than 0° relative to a movement axis of the linearly movable tool.

Abstract: A joining tool unit including a hold-down device with a movable tool and a tool counter element. The hold-down device together with the movable tool and the tool counter element are provided opposite each other. A workpiece can be positioned between the hold-down device and the tool counter element in the arranged state. The movable tool and the tool counter element interact in order to form a joint connection. A light-guiding system is formed on the hold-down device, to conduct a light beam in the direction of a joint location of the workpiece when the workpiece is arranged on the joining tool unit. A flow channel for a fluid is defined along a section of the light beam up to a workpiece-side end of the hold-down device.