Study on residual stresses in tube welds out of the a Ni-based superalloy Alloy 617 occ welded by Laser-Multi-Pass-Narrow-Gap-Welding (Lase
Current ecological necessities and political developments led to the “energy transition” which will change future power generation. However, highly efficient thermal power plants are still needed and the enhancement of their efficiency helps to achieve the global climate protection goals. For this reason, research focuses on advanced ultra-supercritical (A-USC) power plants running with importantly increased steam temperature. Increasing the working temperature of turbines results in tougher requirements on the materials e.g. high-temperature stress rupture strength, oxidation behaviour, structure stability in long-time. One of the most promising candidates to meet these challenges is the Ni-based super-alloy Alloy 617 and its further improvements Alloy 617B or Alloy 617 occ. Laser welding is the preferable technique for precise welding. It can potentially been used for the manufacturing of e.g. turbine shafts, super heater tubes, fittings or flanges. Scientists at Fraunhofer IWS [3] developed the Laser-Multi-Pass-Narrow-Gap (Laser-MPNG) welding technique. It overcomes limitations of laser welding by oscillating the laser beam between the two side walls of the sea
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KESSLER Benjamin; CABEZA Sandra and PIRLING Thilo. (2018). Study on residual stresses in tube welds out of the a Ni-based superalloy Alloy 617 occ welded by Laser-Multi-Pass-Narrow-Gap-Welding (Lase. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-147
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