Application status analysis of standard methods for routine physicochemical testing of nuclear-grade welding consumables

Significant progress has been made in recent years in formulating and revising standard methods for the physicochemical testing of nuclear-grade welding consumables. However, systematic divergences persist among inspection standards due to differences in national industrial bases, often leading to misinterpretation of technical requirements and ambiguity in implementation, thereby restricting international technical interoperability and equipment trade cooperation. This paper focuses on three core areas: chemical composition, mechanical properties, and metallographic inspection. It systematically compares the differences among the American (ASME), French (RCC-M), and Chinese (NB/T) codes and reviews the current application status of standard testing methods for nuclear-grade welding consumables. Furthermore, the study summarizes the technical characteristics of these three codes, identifies key issues within the current standardization system, and proposes constructive improvement measures. The findings provide technical support for establishing a more scientific and comprehensive inspection standard system for nuclear-grade welding consumables.