电流种类对Cr-Mo-V钢埋弧焊焊缝冲击韧性的影响

Effect of welding current type on SAW weld metal toughness of Cr-Mo-V steel

为寻求提高焊缝金属韧性的途径,以21/4Cr-1Mo-1/4V钢焊接为例,采用埋弧焊及相应的焊接材料,分别用直流反接与交流两种焊接电流进行焊接,通过对焊缝金属的性能试验,结果表明焊缝金属的化学成分和抗拉强度没有明显差别,但交流焊接的焊缝金属冲击韧性较直流有明显提高。这主要是因为焊缝金属的一次组织形态和多层焊再热作用使细晶区扩大,改善了交流焊接的焊缝韧性。

To seek the way to improve impact toughness of weld metal,based on 21/4Cr-lMo-1/4V steel,the article used the corresponding welding materials,tested by DCEP and AC,The results showed that the chemical compositions,tensile strength are not significant difference between DCEP and AC,but the AKV impact toughness using AC welding is widely improved than using DCEP welding. this is because of the first microstructure form and the reheats of multi-layers expand the fine grain areas.thus impact toughness of 21/4Cr-1Mo-1/4V steel Weld metal using AC welding is widely improved.