Ferritic-austenitic duplex steels are used in a number of industries, such as the entire field of semi-finished product manufacturing as well as in offshore, apparatus and plant engineering. Components made of duplex steels with a high wall thicknesses (t > 12 mm), such as welded pipes, are preferably welded by electron beam (EB) due to economic and quality reasons. However, the procedure-specific process characteristics of EB welding lead to the formation of an unfavorable microstructure of the weld metal with an impermissibly high ferrite content of approx. 90 %. This results in a significant reduction in the impact toughness at low temperatures and in the decreased corrosion resistance of the joint zone. In order to adjust the permissible austenite/ferrite content, the components must therefore undergo solution annealing after the welding process, increasing the manufacturing costs. This project aims the development of an EB welding process in which permissible austenite/ferrite contents can both be set in the weld seam and in the heat-affected zone, hence, the cost-intensive heat treatment can be dispensed with. This goal is to be achieved by using nickel-based filler materials, as these can be used to specifically influence the chemical composition and thus the microstructure of the weld seam. In addition, the heat input is further reduced by a specific welding process modification in order to reduce the width of the heat-affected zone. All in all, this produces a joint weld that meets the normative requirements with regard to corrosion resistance and mechanical-technological properties, with significantly lower production costs than is currently necessary. This approach has already been confirmed in preliminary tests and is now to be developed for industrial application in this project.