在低合金钢焊条中,通过药皮过渡稀土合金,探讨其对低合金钥焊缝韧性的影响机制.结果表明:适量的稀土具有去氢、脱硫、减少夹杂、净化焊缝组织、细化晶粒的作用.并能抑制创板条铁素体的形成.因此,使低合金钢焊缝韧性得到明显提高. In the low alloy steel electrode, the influence mechanism of low temperature alloyed alloy on the toughness of the low alloyed key weld was discussed through the transition skin coating.The results show that: the proper amount of rare earth has dehydrogenation, desulfurization, reducing inclusions, cleaning the weld microstructure, refining the crystal Grain and can inhibit the formation of lath ferrite, therefore, the toughness of the low alloy steel weld is obviously improved.