Speaker
Teteny Baross
(WIGNER RCP)
Description
The actuality of the topic comes from the ITER (International Thermonuclear Experimental Reactor) fusion tokamak that is a major international experiment with the aim of demonstrating the scientific and technical feasibility of fusion as an energy source. Among others the most challenging task is to find proper materials and technology for Plasma Facing Components.
Welding by HIP (Hot Isostatic Pressure) or diffusion bonding methods as a candidate solution between Plasma Facing Components generated significant technological investigations over the last decades. There are several areas where it can be adapted: the shaping of cooling channels inside the Blanket Modules by grooves require diffusion welding of large surfaces, while the welding of plasma facing tiles as Be and W to heat sink materials is foreseen at first wall and to Divertor cooling channels. These require HIP, or similar diffusion methods as HRP (Hot Radial Pressure welding). These technologies can result in mechanical degradation and microstructural changes at the bonding surfaces. As a consequence, microstructural characterization is required for standardization of the HIP technologies.
This paper intends to summarize the following topics in the diffusion bonding subjects: the use of metallic interlayers between welded materials for compensation of their different physical properties; the formation and effect of intermetallic layers in the transition area; the impact of thermal fatigue at welded surfaces; the behaviour of ODS steel in the in the conditions of HIP welding technologies.
This paper is going to summarize the state of the art of high standard knowledge of the four technical fields of Plasma Facing Components: using of interlayers, the effect of intermetallic layers, impact of thermal fatigue and the behaviour of the ODS steel during HIP welding process.
Co-authors
Gabor Veres
(WIGNER RCP, RMKI, Konkoly-Thege Miklós u. 29-33, Budapest, H-1121,, Hungary)
Laszlo Janosi
(Department of Mechatronics, Szent István University, Páter K. u. 1., Gödöllő, H-2103, Hungary)
Teteny Baross
(WIGNER RCP, RMKI, Konkoly-Thege Miklós u. 29-33, Budapest, H-1121,, Hungary)
