Process and apparatus for the in-line inspection of the depth of a weld by a pulse beam

摘要

A process for the in-line inspection of the depth of a weld carried out by a welding beam pulse in which around its impact point on a workpiece, the beam pulse produces a welding plasma wherein, only during the emission of a welding beam pulse, at least one selected monochromatic emission line of the welding plasma is optically collected from the workpiece. The energy of said lines is converted into analog electrical signals and those signals are digitally processed with the resulting signals being compared with reference signals to produce an indication of the weld depth. Apparatus for performing this process is also disclosed.