FCAW堆焊双相不锈钢2205工艺分析

Analysis of FCAW surfacing process of 2205 duplex stainless steel

采用药芯焊丝二氧化碳气体保护焊(FCAW)在低碳钢表面堆焊一层双相不锈钢表层,综合分析了双相钢堆焊层的力学性能、耐腐蚀性能及铁素体-奥氏体(α-γ)两相组织的演变规律。结果表明:选用E2209T1-1药芯焊丝,配合空冷冷却方式,并合理控制焊接热输入为20. 25 kJ/cm,堆焊层可以获得综合力学性能优异的两相组织;两相组织包括沿晶界或亚晶界分布的针叶状奥氏体和不连续分布的块状铁素体,且堆焊层的铁素体含量约为42%;堆焊层兼具优良的力学性能和耐腐蚀性能。

The mechanical properties,corrosion resistance,and the Ferrite-Austenite（ α-γ） dual-phase structure of the overlaid duplex stainless steel were analyzed,which was deposited by Flux-cored Arc Welding（ FCAW） with CO2 gas shielded on the low-carbon steel plate. The results show that the E2209T1-1 flux cored wire,the method of air cooling and the welding heat input of 20. 25 k J/cm have no significant effects on the mechanical properties of the surfaced layer. The surfacing layer is mainly composed of massive Ferrite and acicular Austenite along the Ferrite grain or sub-crystal boundaries. The ferrite content of the surfacing layer can reach up to 42%,which makes the surfacing layer more superior performance and corrosion resistance.