１引言随着国民经济的迅速发展以及对能源的迫切要求，发电设备逐步向高水平、大容量方向发展，对发电设备的材料和制造工艺也都提出了更高的要求。焊接技术作为发电设备制造的主要工艺手段，正随着焊接设备自动化程度的提高，以及焊接材料和焊接方法的不断改进，成为大型... 1 Introduction With the rapid development of the national economy and the urgent demand for energy, power generation equipment is gradually developing towards a high level and large capacity, and higher requirements are also placed on the materials and manufacturing processes of power generation equipment. As the main technological means of power equipment manufacturing, welding technology is becoming more and more popular with the increasing automation of welding equipment, as well as the continuous improvement of welding materials and welding methods.