Tomsk Polytechnic University, Tomsk, Russia:

M. S. Slobodyan, Senior Researcher, e-mail: mss@tpu.ru

This paper shows the analysis of evolution of zirconium alloy detail joint technology. Most attention is paid to the methods, used during the manufacturing of fuel rods and spacer grids. There is also given the information about the attempts of development of zirconium alloy brazing, explosion welding, diffusion and friction welding, and about the investigations, aimed on optimization of thermal and thermomechanical treatment of welded joints. Nowadays, the most urgent problems of equipment improvement are increasing the efficiency and lifecycle, and the quality of welding zone protection from the possible pollution of welding bead from environment. It is necessary to expand the technological possibilities due to programming of welding mode parameters, and automated control by forecasting and joints quality control using feedback or integrated automatic nondestructive control. Optimization of welding processes should be based on substantiation of mode parameters change in time taking into account the results of mathematical modeling and computer simulation of joint formation. At the same time, two basic requirements should be combined. The first one is the provision of required-size welded joints formation stability with minimal possible input energy for minimal time for the purpose of decreasing of negative impact of high temperature and environment. The second one is the required smooth decreasing of energy, input in welding area for decreasing of the residual stresses and formation of quenching structures, having the increased inclination to corrosion and delayed hydride cracking.

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