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威胁低合金钢焊接结构安全度的首要问题是脆性破坏,由此而造成某些低合金钢球罐的灾难性事故,所以在低合金钢球罐的制造及补焊修复过程中,越来越强调提高焊缝金属的韧性。为此,国内一些单位已研制和使用含镍焊条,例如对“结507”焊条,适当降低焊条金属中的 Mn、Si 含量,加入约0.3～2％的镍,可改善焊缝金属的抗冷裂性能和提高焊缝金属的低温冲击韧性。
The first problem that threatens the safety of low-alloy steel welded structures is brittle failure, which caused some catastrophic accidents of low-alloy steel ball tanks. Therefore, in the process of manufacturing and repairing low alloy steel ball tanks, Emphasis on improving the toughness of the weld metal. To this end, some domestic units have developed and used nickel-containing welding rod, for example, “knot 507” electrode, the appropriate reduction of the electrode metal Mn, Si content, adding about 0.3 ~ 2% of nickel, weld metal can improve cold resistance Cracking performance and improve the low temperature impact toughness of the weld metal.