welded joint of metal 金属焊接接头 refinement of welded metal 焊缝金属晶粒细化 welded metal bellows mechanical seal 焊接金属波纹管机械密封 ..
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焊缝金属晶粒细化
Weld metal grain refinement
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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.
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