IMPROVEMENT THE ROOT STABILITY OF THICK WELDS DURING ELECTRON BEAM WELDING

1 HAVLÍK Petr
Co-authors:
1 KOUŘIL Jan 1 DLOUHÝ Ivo
Institution:
1 Institute of Materials Science and Engineering, NETME center, Brno University of technology, Technická 2896/2, 616 69 Brno, Czech Republic, havlik03pet@rmail.com
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
700-705
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
15 views / 5 downloads
Abstract

Electron beam (EB) welding of thick materials is not an easy task and finding the correct welding parameters and conditions is one of the crucial factors especially when the quality of weld root is required. The undesirable features of an electron beam weld can lead to premature failure or reduces the effectiveness of the resulting components (for example impellers). In attempts to understand how these defects are formed, the formation of EB cavity is primary importance. The greatest significance is attributed to the cavity oscillation in size and shape due to the rapid pressure and temperature changes which occurs during formation of EB cavity. These dynamic behaviors of molten metal during EBW enable creation of liquid metal protrusions in cavity instabilities – spiking. In the preset paper the initial results of several steel and titanium plates with different thickness welded without filler metal are presented. During the welding various approaches have been verified to eliminating the spiking. For spiking elimination the modification of weld joint configuration was tested, using of solder, using of background material and modification of EB welding process parameters. The obtained results are complemented by microstructure analysis and by evaluation of the quality and appearance of the weld root.

Keywords: electron beam welding, spiking, steel, titanium alloy, thick welds
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