Fundamental Studies on Electron Beam Welding of Heat-resistant Superalloys for Nuclear Plants (Report 4) : Temperature and Stress Distribution during Welding

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In this paper, temperature and stress distribution of the welds during welding was analyzed by means of finite element method, employing electron beam weld model and conventional one. Obtained conclusions can be summarized as follows: 1) In the nailhead neck area of the electron beam weld model, the peak temperature to be heated is higher than in other ones, and this area is exposed for longer time to the temperature above 1000℃ than in other ones. Furthermore, tensile stress acts here both within wide range and above 1000℃. For this reason, microcrack is apt to occur in the nailhead neck area of the electron beam welds. 2) In the heat affected zone of the conventional weld model, the peak temperature to be heated is not so high as in that of electron beam weld model. Furthermore, the internal restraint intensity on cooling in the heat affected zone is smaller than that of the electron beam weld model. For this reason, microcrack does not occur in the conventional welds so often as in the electron beam welds.
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