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Welding Distortion Assessment for Hydraulic Connections of Complex Assembly of Neutral Beam Accelerator Grid
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Negative Ion Neutral Beam (NB) accelerator grids, made up of Oxygen free copper are actively cooled and are connected to external hydraulic circuit by welded connection. Cooling pipes are of SS316L material and Grids are manufactured with the oxygen free material (CuOF), which are welded with the transition stubs provided of Inconel material. Grids have the very high tolerances (in the range of microns) in terms angles, flatness and positional accuracy of the features. The welding of cooling pipe assembly to the grid plate introduce distortion which can affect the achieved tolerances on the main functional area of the machined grids.
Considering the requirement of angles, flatness and the positional tolerances of gird plate and its features; the need arises to have the assessment of weld induced distortion on functional area of CuOF Plate. Additionally, it is also necessary to assess the direction of the stress propagation, considering the dissimilar weld and having the mass difference in the plate and pipe assembly. Various configurations have been assessed and the welding simulation was performed to study the distortion on the assembly.
Keywords
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