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研究了ＴＩＧ焊接时微量杂质元素Ｎａ对０１４２０Ａｌ－Ｍｇ－Ｌｉ合金焊缝金属力学性能的影响．Ｎａ含量小于２０μｇ／ｇ时，焊缝金属不发生脆化，含量达到５０μｇ／ｇ时，焊缝强度稍有下降，塑性急剧降低用电子探针分析发现Ｎａ在焊缝枝晶界偏聚．
The effect of trace impurity element Na on the mechanical properties of the weld metal of 01420Al-Mg-Li alloy during TIG welding was studied. When the content of Na is less than 20μg / g, the weld metal does not embrittle. When the content reaches 50μg / g, the weld strength slightly decreases and the plasticity decreases sharply. It is found by electron probe analysis that Na is segregated at the dendritic boundaries of the weld.