酸素および窒素分圧の異なる溶接雰囲気中におけるTIG溶接現象と溶接部の性質(その2) : ジルコニウム合金管の溶接に関する研究(第5報)

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The purpose of this study is to investigate the influence of extreamly low levels of oxygen and nitrogen partial pressure, P_<O_2> and P_<N_2> in pressurized TIG welding atmospheres on the welding phenomenon and properties of welds of zirconium alloy tubing. In TIG welding of Zircaloy-2 tubing in welding atmospheres with various P_<O_2> and P_<N_2> in total pressure (P_T) of 0.32 MPa (optionally 0.55 MPa), the arc voltages were measured and the properties of welds (surface discoloration, oxygen and nitrogen contents) were examined. Although definite arc voltage change is not observable at welding in ≦ 12.9 Pa of P_<O_2> and 15.6〜67.2 Pa of P_<O_2+N_2> (P_<O_2>/P_<N_2>=1/4), a tendency of arc voltage drop with increase of P_<N_2> is observed at welding in 13.1〜53.0 Pa of P_<N_2> (P_<O_2>=0.3 Pa). The surface of weld metal and heat affected zone (HAZ) in the atmosphere of 0.3 Pa of P_<O_2> and 1.3 Pa of P_<N_2> remains bright. The surface discoloration is observable slightly on weld metal and HAZ in the atmosphere of 3.4 Pa of P_<O_2>, and with increase of P_<O_2> the initial straw color becomes darker until it gets partially blue. No surface discoloration is observable on weld metals and HAZ in the atmospheres of P_<N_2>≦53.0 Pa with 0.3 Pa of P_<N_2>. The nitrogen content [N] in the weld metal increases linearly with increase of √<P_<N_2>>, and the increasing rate of [N] in inner part of weld metal is lower than that of [N] in outer part. The oxygen content [O] in outer part of weld metal increases linearly with increase of √<P_<O_2>> and shows same relations as [N], although the values of [O] in the weld metals flucutuate more than [N]. The increasing rates of [N] and [O] in the weld metal under P_T =0.32 MPa are lower than that of [N] and [O] in the weld metal under P_T=0.10 MPa which is reported in Report 3.
社団法人溶接学会の論文
1994-08-05

酸素および窒素分圧の異なる溶接雰囲気中におけるTIG溶接現象と溶接部の性質(その2) : ジルコニウム合金管の溶接に関する研究(第5報)

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