ビード形成―温度場―硬さ予測モデルを用いた炉内計装筒管台におけるテンパービード補修溶接の適用性に関する考察

抄録

To rationalize the evaluation process of temper bead repair welding, a numerical model that can predict hardness during repair welding was developed by combining a coupled bead shape-heat conduction analysis model with a hardness prediction model based on many experimental results. To confirm the usefulness of the developed model, bead-on-plate welding was performed experimentally and numerically to compare the measured and calculated distribution of hardness. As a result, measured and calculated hardness were in good agreement. In addition, the developed model was applied to temper bead repair process for a bottom-mounted instrumentation, and the appropriate welding conditions for reducing the hardness of the repair welded zone were discussed. Numerical results revealed buttering and small heat input could be effective to reduction of hardness for temper bead welding. Since these results was consistent with previous findings, the developed model was found to be applicable to the temper bead welding and it enables quantitative evaluation of hardness according to temper bead repair welding conditions.