本文总结了熔化焊金相分析的内容、程序,熔化焊热影响区各区的显微组织特点,熔化焊接头金属显微组织的鉴别方法,介绍了根据形成温度、形貌特征和利用显微硬度鉴别熔化焊缝金相组织等工厂级适用手段,提出了在试样制备时应注意的事项和技术要点。 This paper summarizes the contents, procedures, the microstructure features of the regions affected by the welding heat-affected zone and the identification methods of the metal microstructure of the welding head. The methods of forming the microstructure of the welding head based on the formation temperature, Identification of molten weld microstructure and other factory-level means of application, put forward in the sample preparation should pay attention to the matters and technical points.