Abstract: The invention concerns a composite material in band or slab form made of two cover plates (1, 2), made of steel, which can be resistance welded together via electrically conductive bodies (4), and an intermediate layer (3) made of a filler material in which the bodies (4) are embedded, with the bodies (4), which are implemented as curved slugs, lying pressed flat between the cover plates (1, 2). This type of composite material is produced in that the filler material (3′) for the intermediate layer (3) is applied as a paste to a band (1′) serving as the first cover plate (1) as it passes by and the curved slugs (4′) are, after being laid on the filler material (3′), pressed into it at least until contact is made via a band (2′) supplied as the second cover plate (2) in a welding gap (8) formed by two roller electrodes (6,7) of a resistance welding device and the slugs are largely pressed flat with the bands (1′, 2′) during welding.

Abstract: The invention relates to a method for welding a double layer sheet metal (1, 2) having an intermediate layer (5), in particular, a sheet metal with knobs, with a bonding sheet metal (8) by spot or roll seam welding. Before welding of the bonding sheet metal (8) with the two cover sheet metals (1, 2), spaced apart by the intermediate layer (5) of the double layer sheet metal, is carried out, the area (11) about the welding location (12) is burned free of the intermediate layer (5) by the current which is introduced over a large surface area into the cover sheet metals (1, 2) via the welding electrodes (9, 10) placed thereat and guided via a shunt adjacent to the welding location (12). Only thereafter, the sheet metals are brought into conducting contact with one another by a directed local pressure application, and the welding process is carried out.