ELECTRON BEAM WELDING OF TUNGSTEN AND ODS ALLOYS

1 JAN Vít
Co-authors:
1 ČUPERA Jan 1 HAVLÍK Petr
Institution:
1 Brno University of Technology, Institute of Materials Science and Engineering, NETME Centre, Brno, Czech Republic, jan@fme.vutbr.cz
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1746-1750
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
22 views / 9 downloads
Abstract

The weldability of advanced heat resistant ODS metallic materials in combination with other materials is a prior requirement for their wider use in industry energy production. A special case is formed by the requirements of the International Thermonuclear Experimental Reactor (ITER) construction, where tungsten alloy needs to be incorporated in weld joint.Due to heating during conventional welding, the microstructure and properties of the resulting weld joints are affected and the joints often become the weakest point of the structure. The electron beam welding with its reduced heat affected zone size may be an answer in this as it is one of the few techniques able to melt tungsten. The presented article is focused on thorough metallographic evaluation of the structure of heterogeneous electron beam welds which combine stabilized tungsten alloy WL10 with MA956 ferritic ODS steel. EB welded joints were evaluated by light and analytical electron microscopy including EDS analyses in the as-welded. Mechanical properties were evaluated by microhardness profiles. Achieving an appropriate structure of such welds and correct welding parameters are crucial aspects for future successful application of similar joints.

Keywords: Electron beam welding, heterogeneous welds, tungsten joining, ODS, diverter first wall
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