溶接雰囲気とTIG溶接熱影響部の性質(その1) : ジルコニウム合金管の溶接に関する研究(第6報)

概要

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To grasp the characteristics on TIG weld joints of Zircaloy-2 tubing, the properties of weld heat affected zone (HAZ) welded in welding atmospheres with extremely low level of oxygen and nitrogen partial pressures, P_<O_2> and P_<N_2>, were examined as compared to weld metals. The original fine structures of Zircaloy-2 tubing are re-crystallized at heated zones to β phase and α+β phase range, and the grains grow gradually from end of HAZ to fusion boundary. The nitrogen content [N] in outer part of HAZ increases linearly with increase of √<P_<N_2>> as same as weld metals and the increasing rate of [N] is higher at nearer portion (0-1 mm) to fusion boundary than that of next portion (1-2 mm).[N] in inner part of HAZ does not increase even in case of welding in atmospheres with higher P_<N_2> (P_<N_2>=53.3 Pa) and also at the nearer portion (0-1 mm) to fusion boundary. Although the oxygen content [O] in HAZ increases in case of welding in atmosphere with higher P_<O_2> (P_<O_2>=13.9 Pa), the values of [O] in HAZ fluctuate more than [N], as weld metals, and definite relations between P_<O_2> [O] in HAZ were not obtainable.
社団法人溶接学会の論文
1994-08-05