Influence of wire electrode coatings on the mechanical-technological weld and process properties
Project Manager: Prof. Dr.-Ing. V. Wesling Funding period: 08/18 - 08/21
The efficient use of resources and energy is the focus of research nowadays. This results in the objective of this DFG project, how single- or multi-layer thin-film systems on solid wire electrodes during MSG welding influence the welding process and the mechanical-technological properties of the weld metal of welded joints, mainly made of unalloyed and low-alloyed steels. For this purpose, the effects of various elements, on the welding wire electrode are studied and characterized. The basis is to identify, understand and apply the effects that modify the mechanical properties (strength, elongation, toughness, etc.) as well as process properties (arc stability, droplet transition, weld pool dynamics, etc.). The wire electrode will be coated with metallic as well as non-metallic coatings in order to investigate a wide range of influences due to different accompanying elements.
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. A striking feature here is the significant reduction in elongation at break. In the future, this problem is to be eliminated by adding nickel so that solid wire electrodes with higher yield strengths can be produced without reducing the forming capacity.
On the basis of a fine-grain steel S700MC, mathematical relationships are to be established between coating thickness and the influence of various process variables. 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 simultaneously exhibits an increase in strength as well as 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 set desired mechanical properties of the component in a targeted manner.