Abstract: The invention relates to a device (22) for evaluating an image (20) produced on a carrier material (8) by spot welding of a weld spot (19) using an optical image-detecting unit (23), comprising a camera (24) which consists of at least one detection means (25) and one lens (26). In order to create an evaluation device (22), by means of which the optical quality testing of spot-weld joints can be improved, the image-detecting means (23) comprises an illumination device (27) with a diffusor (28) for diffusively and homogeneously illuminating an image (20) of the spot-welding on the carrier material (8). Furthermore, the invention relates to a welding tool (1) for a spot-welding plant, in particular a welding gun (2), having an evaluation device (22) for analyzing an image (20) of a spot weld (19) on a carrier material (8).

Abstract: A band for protecting electrodes of a spot-welding gun for welding metal sheets includes a carrier material. At least one electrically conductive layer is provided on the side facing the metal sheets. At least two layers are provided on the metal-sheet side of the carrier material in order to create such a band when welding aluminum and/or aluminum alloys, via which the contrast of the imprint of the welding spot can be increased and the electrode can be protected optimally. The outermost layer is made of tin and the layer arranged therebelow is made of nickel-phosphorous. Furthermore, on the carrier material, at least one adhesive layer may be provided for the layers superimposed.

Abstract: The invention relates to a device (22) for evaluating an image (20) produced on a carrier material (8) by spot welding of a weld spot (19) using an optical image-detecting unit (23), comprising a camera (24) which consists of at least one detection means (25) and one lens (26). In order to create an evaluation device (22), by means of which the optical quality testing of spot-weld joints can be improved, the image-detecting means (23) comprises an illumination device (27) with a diffusor (28) for diffusively and homogeneously illuminating an image (20) of the spot-welding on the carrier material (8). Furthermore, the invention relates to a welding tool (1) for a spot-welding plant, in particular a welding gun (2), having an evaluation device (22) for analyzing an image (20) of a spot weld (19) on a carrier material (8).

Abstract: The invention relates to a band (7) for protecting electrodes (6) of a spot-welding gun for welding metal sheets (3, 4), comprising a carrier material (24), wherein at least one electrically conductive layer (16) is provided on the side (15) facing the metal sheets (3, 4). At least two layers (16, 20) are provided on the metal-sheet side (15) of the carrier material (24) in order to create such a band (7) when welding aluminum and/or aluminum alloys, by means of which the contrast of the imprint (24) of the welding spot (13) can be increased and the electrode (6) can be protected optimally, wherein the outermost layer (16) is made of tin and the layer (20) arranged therebelow is made of nickel-phosphorous. Furthermore, on the carrier material (24), at least one adhesive layer (18, 26, 27) may be provided for the layers (16, 20) superimposed.