Nuclear safety is the lifeline and bottom line of the nuclear industry, and the design, manufacturing, installation, and operation quality of nuclear power engineering are the foundation for ensuring the safe operation of nuclear power plants and the cornerstone for promoting the healthy development of the nuclear energy industry. Welding, as the most critical processing technology and means widely used in the manufacturing, installation, and operation maintenance of nuclear power equipment, its quality directly affects the quality of nuclear power equipment, nuclear safety, and the healthy, sustainable, and stable development of the nuclear power industry.