The effect of Re element addition on the nitrogen content in the weld was insignificant due to the oxidization from the early deoxidization stage.
而由于稀土元素在先期脱氧中大量氧化，其脱氮效果较弱，稀土元素对熔敷金属的总含氮量的影响不显著。
It was also found out that proper re element addition could increase the toughness of the weld metal and improve its microstructure by grain refinement.
适量的稀土元素可改善焊缝金属组织的形态、细化晶粒、提高韧性。
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