VIEWING OPTICS FOR EXTERNAL-MOUNT ELECTRON BEAM WELDERS

摘要

This invention relates to the art of electron beam welding within a vacuum chamber and has specific reference in particular to an optical system for viewing the workpieces to be welded from outside the vacuum chamber, either before or during the welding operation. The apparatus includes an automatic motorized means for adjusting the focus of the viewing system to accommodate different electron beam gun to work distances, and at the same time to automatically adjust the angle with respect to the axis of the electron beam along which the view of the area being welded is to be observed, as well as a rotatable disc for shielding the optical parts of the viewing system from the vapors and radiations which are generated during the electron beam welding process, and a means for illuminating only the area on the work surface which is to be viewed.