抛光态下观察编号为A2-2-1/A2-2-2试样，试样中氮化物和碳化物总量小于0.5%。焊缝金相组织为铁素体+奥氏体，晶界未发现连续析出物的化合物。热影响区金相组织为铁素体+奥氏体，晶界未发现连续析出物和化合物。母材金相组织为铁素体+奥氏体，晶界未发现连续析出物和化合物。

The total amount of nitrides and carbides was less than 0.5% in the polished sample numbered A2-2-1/A2-2-2. The metallographic structure of the weld is ferrite + austenite, and no compound with continuous precipitation is found at the grain boundary. The microstructure of HAZ is ferrite + austenite, and no continuous precipitates and compounds are found at grain boundaries. The metallographic structure of base metal is ferrite + austenite, and no continuous precipitates and compounds are found at grain boundaries.