1. A method for monitoring a welding area of an object ( 14 ) during a welding process that utilizes a welding head, said method comprising: during said welding process, illuminating the welding area with ultraviolet radiation of a predetermined ultraviolet wavelength by means of a source other than said welding head; using a means ( 3 ) for reproducing, reproducing the welding area while it is being welded; and filtering radiation from the welding area in a direction toward said means ( 3 ) for reproducing, said filtering being carried out using a band-pass filter ( 4 ) around the predetermined ultraviolet wavelength.