The use of ultra-high-strength aluminium alloys plays a key role in future lightweight construc-tion in the field of electromobility. In particular, the high-strength aluminium alloy AA 7075 is predestined for such lightweight structures due to its excellent properties, i.e. its high specific strength. A disadvantage of this aluminium alloy is its unsuitability for welding, especially for conventional fusion welding processes such as tungsten inert gas welding. But even for high-technology processes such as laser beam welding, the AA 7075 aluminium alloy is a big chal-lenge in terms of weldability and the weld strengths that can be achieved. This is mainly due to the different alloying elements and their evaporation behaviour, which ultimately leads to instabilities in the vapour capillary and therefore to undesirable weld defects. Furthermore, as with other precipitation hardening aluminium alloys, strong softening occurs within the joining zone. Even with the help of a downstream heat treatment, the strength in the weld metal can-not be increased to the base material level. An approach established in practice for improving the mechanical-technological weld seam properties is the use of suitable filler metals. For the high-strength aluminium alloy AA 7075, however, suitable filler metals are only available on the market to a limited extent, which do not reach the strength level in the base material after the laser beam welding process and subsequent heat treatment. Within the context of subpro-ject A3 from the research project "Allegro", an experimental welding filler material made of AA 7075 was procured, which is doped with titanium carbide. In order to be able to assess the suitability of this experimental filler metal, a qualified filler metal available on the market with the type designation "S Al 5087 (AlMg4,5MnZr)" was also procured. The main objective of the present study is to investigate the influence of these two filler metals on the weld microstruc-ture of an AA 7075 welded joint and its mechanical-technological weld properties directly after laser beam welding and a following heat treatment.