Protective cover, used to protect optical unit e.g. lens to be protected from liquid metal spatter, particulates and smoke, includes welding torch of weld robot for welding observation, and metal grid including non-melting wires or bars

The protective cover comprises a welding torch of weld robot configured for welding observation, and a metal grid (6) facing an interior of an entrance area of an optical unit in the welding torch and provided in a blurred optical portion of the optical unit. The metal grid includes non-melting wires or bars (7) having smallest diameter or cross-section at an angle of 90[deg] to a view axis, which is discontinuously changeable by a lateral removal from the entrance area or is firmly embedded in the entrance area. A stripper (2) is provided along the wires or bars of the metal grid. The protective cover comprises a welding torch of weld robot configured for welding observation, and a metal grid (6) facing an interior of an entrance area of an optical unit in the welding torch and provided in a blurred optical portion of the optical unit. The metal grid includes non-melting wires or bars (7) having smallest diameter or cross-section at an angle of 90[deg] to a view axis, which is discontinuously changeable by a lateral removal from the entrance area or is firmly embedded in the entrance area. A stripper (2) is provided along the wires or bars of the metal grid. The stripper has, on its end, vertical, equally spaced openings (3) through which the wires or bars pass to the side of the metal grid. The stripper is manually or automatically moved on surfaces of the wires or bars. The wires or bars have a diameter or cross-section of less than 0.1 mm and a spacing of 1 mm. A distance between the metal grids is less than 1 mm. The stripper is formed as a perforated plate. An additional discontinuous switchable pressure shock is provided for supplying air or an inert gas to the wires or bars through the stripper to remove the mechanically dissolved spatter from the entrance of the optical unit. Die Erfindung betrifft einen wechselbaren oder selbstreinigenden Spritzschutz zum Schutz einer optischen Einheit, die dem Schweißbrenner eines Schweißroboters zur Schweißbadbeobachtung zugeordnet ist. Er ist gekennzeichnet dadurch, dass im Innern des Eingangsbereichs der optischen Einheit (13) und dort im unscharfen optischen Abschnitt zumindest ein metallisches Gitter (6) aus einer Vielzahl, nichtschmelzender, Drähte oder Stege (7) geringsten Durchmessers oder Querschnitts in einem Winkel von 90° quer zur Sichtachse (5) angeordnet ist, welches entweder diskontinuierlich mittels einer seitlichen Entnahme aus dem Eingangsbereich wechselbar ausgebildet oder im Eingangsbereich f