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Project manager: Prof. Dr.-Ing. Wesling
Funding period: 08/18 - 08/21
The efficient use of resources and energy is the focus of research today. As a result, the objective of this DFG project is to investigate how single or multi-layer thin-film systems on solid wire electrodes influence the welding process and the mechanical-technological properties of the weld metal of welded joints, predominantly made of unalloyed and low-alloy steels, during GMAW welding. To this end, the effects of various elements on the welding wire electrode are investigated and characterized. The basis is the identification, understanding and application of the effects that change the mechanical properties (strength, elongation, toughness, etc.) and process properties (arc stability, droplet transfer, weld pool dynamics, etc.). The wire electrode is to be coated with metallic and non-metallic coatings in order to investigate a wide range of influences from various accompanying elements.
The preliminary investigations have shown that the welding behavior and the mechanical-technological properties of the material are strongly dependent on the coating systems on the wire electrode. The significant reduction in elongation at break is striking. This problem is to be solved in future by adding nickel so that solid wire electrodes with higher yield strengths can be produced without reducing the forming capacity.
Mathematical relationships between coating thickness and the influence of various process variables are to be established on the basis of a fine-grained steel S700MC. This model is to serve as a basis for other base materials. To demonstrate the potential of this project, a coating system is to be developed taking into account the influencing factors for uniform penetration with high arc stability, which at the same time shows an increase in strength and toughness values.
The characterization of the influences and their effects of the coated solid wire electrodes on MSG welding will enable the targeted introduction of accompanying elements in the future in order to be able to specifically adjust the desired mechanical properties of the component.