Device for process control in a deposition welding process

The invention relates to an apparatus and a method for process monitoring during a build-up welding method. Object of the invention is to provide a device in which the process control is further optimized with a hardfacing process and be reliably avoided process variations that can affect the quality of a product. Surprisingly, the known from the prior art devices can be trained for process monitoring during the coating to a substantially optimized process monitoring, in which these by means for detecting a period during which the detected surface region is above a predetermined minimum value, and means for automated Cancel the process of build-up welding, if the time span of the detected surface region is above a predetermined value are added.