In this study, nickel-based alloy 625 and duplex stainless steel (DSS) UNS S32205 (2205) dissimilar pairs were welded with metal inert gas (MIG) welding process. Weld metal, obtained with the utilization of ERNiCrMo-3 filler wire, was subjected to mechanical, microstructural, and corrosion investigations. V-notch impact tests and micro hardness measurements were realized on dissimilar weld metal. Microstructural changes in weld metal, fusion line, and heat-affected zone were examined using optical, scanning (SEM), and transmission electron microscopes (TEM) with energy-dispersive spectrometry (EDS). Phase precipitations rich of Nb and Mo were detected among dendritic austenite arms in the weld metal. It was observed that ERNiCrMo-3 filler metal had sufficient toughness because of high nickel content. Corrosion tests revealed that weld metal face pass is the least corrosion-resistant zone in weld metal unlike weld root. This is mainly because more intense intermetallics formed in weld metal face compared with the middle of the weld and the root.

在这项研究中，采用金属惰性气体（MIG）焊接工艺焊接了镍基合金625和双相不锈钢（DSS）UNS S32205（2205）异种对。利用ERNiCrMo-3填充焊丝获得的焊接金属经过机械，微观结构和腐蚀研究。在不同的焊接金属上实现了V型缺口冲击测试和显微硬度测量。使用光学，扫描（SEM）和透射电子显微镜（TEM）和能量色散光谱（EDS）检查了焊缝金属，熔合线和热影响区的微观结构变化。在焊缝金属中的树枝状奥氏体臂之间检测到富含Nb和Mo的相沉淀。观察到由于高镍含量，ERNiCrMo-3填充金属具有足够的韧性。腐蚀测试表明，与焊缝根部不同，焊缝金属端面焊道是焊缝金属中最不耐腐蚀的区域。这主要是因为与焊缝中部和根部相比，在焊缝金属表面形成了更强的金属间化合物。