2205双相不锈钢与304奥氏体不锈钢的焊接

Welding of 2205 duplex stainless steel and 304 austenitic stainless steel

采用焊条电弧焊(SMAW),以E2209作填充材料对2205双相不锈钢与304奥氏体不锈钢异种金属焊接工艺进行研究,通过优化焊接工艺参数,获得了具有良好力学性能和合适双相比例的焊接接头。接头力学性能测试表明,拉伸试样断裂发生在强度相对较低的304母材侧;2205母材侧热影响区的显微硬度值高于焊缝和2205母材,而304母材侧热影响区的显微硬度值高于304母材。对接头过渡层进行XRD相结构分析,未发现M23C6、Cr2N和σ等有害相析出,接头拉伸断口扫描观察表明,接头呈明显韧性断裂特征。接头性能满足工程实际应用要求。

The dissimilar metal welding of 2205 duplex stainless steel and 304 austenitic stainless is performed by shielded metal arc welding（SMAW） with E2209.The dissimilar steel joint takes on good mechanical properties and has ideal biphase proportion through optimized welding technology.The mechanical properties of the welded joint are studied,and results show that the fracture of tensile specimen occurred at 304 base metal region with relatively low strength.The microhardness of 2205 HAZ is higher than that of the weld metal and 2205 base metal,and the microhardness of 304 HAZ is higher than that of 304 base metal.The XRD analysis shows that no precipitation phases of M23C6, Cr2N or σ can be found in the weld metal.From SEM observation,the joint presents obvious ductile fracture characteristic.Consequently, the welded joints can meet the request of engineering application.