双相不锈钢焊接材料的选择及应用

综述了双相不锈钢焊接材料的选用原则及工程应用。结果表明,该焊接材料的选用可采用"准成分匹配"原则,即尽可能使焊缝中的Cr含量与母材接近,同时提高Ni含量并添加适量的N,合理控制焊缝中铁素体与奥氏体的相比例,保证接头获得满意的耐腐蚀性能和焊接性。该钢焊接材料共有5大类,多种工艺方法各具特色,FCAW打底与多种高效焊接方法联合使用的组合工艺优势明显。不同厚度或不同位置的双相不锈钢焊接接头,分别采用匹配的焊接材料和合理的焊接工艺,均在不同的工程中获得成功应用。药芯焊丝的质量稳定性仍需严格控制。

Selection and application of welding consumables for duplex stainless steel

The selection principle and engineering application of duplex stainless steel welding consumables were reviewed. The results show that the principle of "quasi-component matching" can be adopted in the selection of welding consumables for this steel,that is,to make the content of Cr in the weld as close as possible to the base metal,to increase the content of Ni and to add an appropriate amount of N,to reasonably control the ratio of ferrite to austenite in the weld,and to ensure the satisfactory corrosion resistance and weldability of the joint. There are five types of steel welding consumables,and various Processes have their own characteristics. The combination processes of FCAW backing welding and various high efficiency welding methods have obvious advantages. The duplex stainless steel welded joints with different thicknesses or positions,using matched welding consumables and reasonable processes,have been successfully applied in different projects. The quality stability of the flux-cored wire still needs to be strictly controlled.