Q235钢表面堆焊310不锈钢的组织与性能

Microstructure and Properties of Surfacing 310 Stainless Steel on Q235 Steel

采用MIG焊工艺,在Q235钢试板表面堆焊ER-310(H12Cr26Ni21Si)不锈钢。通过试验得出,当焊接电流为208A,焊接电压为19.2V,摆动宽度为12mm,摆动速度为26mm/s,焊接速度为5mm/s,搭接量为7mm时,获得了成形美观、致密无缺陷的不锈钢堆焊层。对堆焊层的显微组织、化学成分进行了分析,测试了堆焊层的显微硬度及不锈钢堆焊层的耐蚀性。结果表明,堆焊层组织为奥氏体树枝晶和等轴晶;Ni、Cr、Fe是组成堆焊层的主要元素;堆焊层硬度高于基体;堆焊后材料表面的耐腐蚀性能明显提高。

ER-310 （H12 Cr26 Ni21 Si ）stainless steel is deposited on the surface of Q235 steel test plate,using the MIG welding process. In the experiments,when the welding current is 208A,the welding voltage is 19. 2V,the swing width is 12mm,the swing speed is 26mm/s,the welding speed is 5mm/s and the amount of overlap is 7mm and well-shaped,dense and defect-free stainless steel surfacing layer can be obtained. The microstructure and chemi-cal composition of the surfacing layer were analyzed and the microhardness of the surfacing layer and the corrosion resistance of the stainless steel surfacing layer were tested. The re-sults show that the microstructure of the surfacing layer is austenitic dendrite and equinoxes crystal. Ni,Cr and Fe are the main elements of the surfacing layer. The hardness of the sur-facing layer is higher than that of the matrix. The corrosion resistance of the surface of mate-rial is obviously increased after surfacing on the matrix.