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Observations on the post-mortem investigation of electron beam welds and other micro-structural features of JET Hypervapotrons

Olsson Robbie, Mikael Brian and Hamilton, Niall Robert and Wood, James and Galloway, Alexander and Milnes, Joe and Katramados, Ioannis (2011) Observations on the post-mortem investigation of electron beam welds and other micro-structural features of JET Hypervapotrons. Fusion Engineering and Design, 86 (9-11). pp. 1642-1645. ISSN 0920-3796

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A metallurgical post-mortem investigation has been carried out on Mark 1 Hypervapotron elements from the Joint European Tokamak (JET), with the aim of aiding engineers in improving the future design of such high heat flux (HHF) component. Optical and electron microscopy and X-ray techniques have been utilised. Work has predominately focused on the electron beam (EB) welded and vacuum brazed joints of the Hypervapotron. Scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX) has been used to assess the chemical composition while micro and nano indentation testing has been used to study the hardness profiles of these joints. Poor quality control of the vacuum brazing process resulted in nickel based filler material, contaminating internal surfaces. Variable penetration and entrapped voids in the EB welds suggested weld spiking occurred during the joining process. Details of these findings and a critical assessment of the potential implications are given where appropriate.

Item type: Article
ID code: 30553
Notes: Linked to Culham Centre for Fusion Energy
Keywords: hypervapotron , EB welding , vacuum brazing , metallurgy, Mechanical engineering and machinery, Mechanical Engineering, Mechanics of Materials, Metals and Alloys, Spectroscopy
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Pure Administrator
Date Deposited: 27 May 2011 14:31
Last modified: 05 Jan 2016 12:37
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