時間的に変化する雰囲気中でのTIG溶接現象と溶接部の性質

ジルコニウム合金管の溶接に関する研究(第2報)

抄録

In TIG welding of Zircaloy-2 tubing in an atmosphere in which the air partial pressure P_AIR decreases with time as high purity inert gases are introduced into a chamber after evacuation to various pressure, the arc voltages were measured and the properties of welds were examined.
The arc voltage increase as the P_AIR in the welding atmosphere decreases.
The nitrogen content [N] in the welded metal varies at each circumferentially devided zone, and a linear relation between the √PN₂ and [N] was confirmed.
The thickness of surface oxided layers after long time autoclave tests in water with high temperature and pressure are also measured and evaluated.