镍铁型铸铁焊条对热裂纹比较敏感。本文应用临界变形速度法,使用HRL-1型热裂纹试验机,研究了稀土钇以及碳、钴、硅、铜、锰、硫、磷对热裂纹的影响,以改善镍铁焊条抗热裂性能。试验表明,稀土钇以及碳、钴和硅在焊缝金属中的含量有一最佳值,超过该值或者低于该值都会使抗热裂性能下降;锰、铜、硫和磷都增加焊缝金属的热裂纹敏感性。本文讨论了这些结论的原因,综合运用稀土钇和钴、碳显著改善了镍铁型铸铁焊条的抗热裂性能。 Ferronickel cast iron electrodes are more sensitive to hot cracking. In this paper, the impact of rare earth yttrium and carbon, cobalt, silicon, copper, manganese, sulfur, phosphorus rarefaction on the hot cracking were studied using the HRL-1 hot cracking tester to improve the thermal cracking resistance . Experiments show that the rare earth yttrium and carbon, cobalt and silicon in the weld metal content has an optimum value above which the value will be lower than the thermal cracking resistance; manganese, copper, sulfur and phosphorus are increased weld Metal thermal cracking sensitivity. This paper discusses the reasons for these conclusions. The combination of rare earth yttrium and cobalt, carbon, significantly improves the hot-cracking resistance of nickel-iron cast iron electrodes.