For arc welding of high-strength and cold-resistant steels, the author developed an advanced design of steel wire with a micro-composite coating of a nickel matrix and nanoparticles of LaF₃ and LaB₆, which improves the metallurgical influence of rare-earth elements (REE) and forms refractory sulphides and oxides of REE, as well as boron nitride. The addition of 0.1–0.3 wt% La in the weld pool leads to an increase in the content of the refractory compounds La₂O₃, LaO₂, and LaS, and to the reduction in the content of the low-melting and brittle oxides and sulphides SiO₂, SiO, MnO, MnS, and SiS. The use of steel wire with the composite coating of LaF₃ and LaB₆ allows for microstructural refinement when welding S960QL bainitic-martensitic steel and X70 API bainitic steel, and increases the impact toughness of the welds by 1.17–1.6 times.

中文翻译：

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贝氏体-马氏体和奥氏体钢的电弧焊中稀土氟化镧和硼化物在焊丝复合涂层中的冶金作用

对于高强度和耐寒钢的电弧焊，作者开发了一种先进的钢丝设计，该钢丝具有镍基体和LaF ₃和LaB ₆纳米颗粒的微复合涂层，从而改善了稀土对冶金的影响元素（REE）并形成难熔的REE硫化物和氧化物以及氮化硼。在焊缝中添加0.1–0.3 wt％的La会导致耐火化合物La ₂ O ₃，LaO ₂和LaS的含量增加，并导致低熔点和脆性氧化物的含量减少和硫化物SiO ₂，SiO，MnO，MnS和SiS。钢丝与LaF ₃和LaB复合涂层的使用_图6允许在焊接S960QL贝氏体-马氏体钢和X70 API贝氏体钢时进行显微组织细化，并将焊缝的冲击韧性提高了1.17-1.6倍。