Abstract
In dissimilar welded joints without filler materials, the dilution is one of the most important factor for the weldability. Due to other factors, the high quality of the welding seam and a good reproducibility of welding parameters the electron beam can be advantageously used to join challenging materials. Several dissimilar welded joints were successfully produced as a result of an optimised variation of the beam offset and the beam current to achieve suitable levels of dilution. For microstructural evaluation, the welded joints were examined by light optical and scanning electron microscopy methods, such as Electron Backscatter Diffraction (EBSD) and Wavelength-dispersive X-ray spectroscopy (WDS). To characterise the mechanical properties and the deformation behaviour of the welded material, microhardness measurements and tensile tests were carried out. For the welds of a high-alloy TRIP steel and the steel DP590, an optimised dilution lead to flawless joints with a tensile strength superior to the TRIP steel. Furthermore, welds of a zirconia-reinforced TWIP steel with an as-cast TRIP steel free of pores and cracks could be produced.
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Acknowledgments
The authors gratefully acknowledge the German Research Foundation (DFG) for supporting this work, which was carried out within the framework of the Collaborative Research Centre (SFB) 799, subproject A7. Furthermore, they would like to thank the German Welding Society for supporting the participation in the 67th Annual Assembly and International Conference and Mr. M. Flume from voestalpine Stahl GmbH for providing the tested DP590. The authors would also like to thank K. Fischer for the SEM investigations, Dr. K. Pranke for the hot-rolling experiments on the PM material, and G. Schade for the realisation of the tensile tests.
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Halbauer, L., Buchwalder, A., Zenker, R. et al. The influence of dilution on dissimilar weld joints with high-alloy TRIP/TWIP steels. Weld World 60, 645–652 (2016). https://doi.org/10.1007/s40194-016-0324-x
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DOI: https://doi.org/10.1007/s40194-016-0324-x