对SAF2205/16MnR双相不锈钢复合板进行了焊接,基层采用手工电弧焊,以E5015焊条为填充材料,过渡层及覆层采用钨极氩弧焊,以ER2209焊丝为填充材料;对焊接接头进行了拉伸试验,利用扫描电镜、光学显微镜及X射线衍射仪等分析了接头过渡层焊缝及其熔合区域的显微组织及物相组成.结果表明:焊接接头的抗拉强度为512 MPa;覆层母材/热影响区/过渡层焊缝之间的显微组织过渡缓和,且铁素体和奥氏体相的比例均在控制范围内;异种金属熔合界面未出现明显的合金元素短程扩散,且在焊缝金属中未发现有M23C6和σ等脆性相析出;所得接头具有良好的力学性能和耐腐蚀性能.

The welding technology of the composite plate of SAF2205 duplex stainless steel and 16MnR steel was studied. The base metal was welded with E5015 welding rods by shielded metal arc welding (SMAW),and transition region and clad metal were welded with ER2209 welding rods by tungsten inert gas arc welding (TIG). The tensile property,microstructure and phase compositions of joints had been analyzed by means of tensile machine,scanning electron microscopy,optical microscopy and X-ray diffraction,etc. The results show that the tensile strength of the joints was 512 MPa,and the microstructure transition between clad metal/heat affected zone/transition layer weld was mild,and biphase proportion of austenite and ferrite was in the required range. The short distance diffusion of alloy elements near the dissimilar steel fusion zone didnt obviously occur. There was also no precipitation of σ phase and M23C6 in the weld metal,which is advantageous to mechanical properties and corrosion-resistance of the joints.