1. A device ( 2 ) for monitoring a welding area of an object ( 14 ) in connection with welding, said device comprising: means for reproducing (3) the welding area; at least one filter ( 4 ) arranged in front of or in the reproduction means ( 3 ); means for illuminating ( 5 ) the welding area with ultraviolet radiation; and said filter ( 4 ) comprising a band-pass filter configured for filtering around a wavelength within the ultraviolet wavelength range.