Irradiating device and machine tool comprising same

The invention relates to an irradiating device (1) for irradiating a machining field (8) with a machining beam, in particular with a laser beam (3), for carrying out a welding process. The irradiatingdevice comprises a scanning device (4) for aligning the machining beam into a machining position (XP, YP) in the machining field (8). The irradiating device (1) has an imaging device (9) for imaginga sub-region of the machining field (8) onto a pyrometer (17) which has at least two pyrometer segments. The imaging device (9) images thermal radiation (19) emanating from the machining position (X P, YP) in the machining field (8) onto a first pyrometer segment, and the imaging device (9) images thermal radiation (19) emanating from a machining field (8) position located along an advancing direction (vR) of the machining beam in the machining field (8) in front of or behind the machining position (XP, YP) onto at least one second pyrometer segment. The invention also relates to a machine tool (10) comprising such an