This paper deals with laser-arc hybrid welding of high nitrogen steel with 1.2 mm diameter filler wire. The effect of nitrogen content in the weld on the microstructure and properties was analyzed. Results show that as the nitrogen content in the weld increases, ferrite growth is inhibited and the average hardness of the weld increases. As the nitrogen content in the weld increases, the tensile strength and elongation of the joints first increase and then decrease. The tensile strength and elongation of the joint with a nitrogen content of 0.52% reach a maximum, which are 928.9 MPa and 7.3%, respectively. As the nitrogen content in the weld increases, the impact energy of the joints first increase and then decrease. The impact energy of the joint with a nitrogen content of 0.52% has the highest impact energy of 51.7 J. Increasing nitrogen content can enhance the solution strengthening effect, but higher nitrogen content will cause nitrogen pores in the weld to form.

本文研究了用 1.2  mm 直径填充焊丝对高氮钢进行激光电弧复合焊接。分析了焊缝中氮含量对组织和性能的影响。结果表明，随着焊缝中氮含量的增加，铁素体生长受到抑制，焊缝的平均硬度增加。随着焊缝中氮含量的增加，接头的抗拉强度和延伸率先升高后降低。含氮量为0.52%的接头的抗拉强度和伸长率达到最大值，为928.9 MPa 和 7.3%，分别。随着焊缝中氮含量的增加，接头的冲击能先增大后减小。含氮量为0.52%的接头冲击 功最高为51.7J 。增加氮含量可以增强固溶强化效果，但较高的氮含量会导致焊缝中形成氮气孔。