As one of the most important nuclear power standards

mechanical component standard of nuclear island is an important safeguard for nuclear power construction. At present

the coexistence of the two sets of mechanical component standards has brought unnecessary duplication and waste to the design and manufacture of mechanical components of nuclear islands. Among them

the differences between the two sets of welding material standards

the causes of the differences and the main difficulties in solving the differences are analyzed

and the solutions are given. Finally

the current work progress is introduced. The pioneering work on technical route unification of welding material standards has great practical significance for improving the standard system of nuclear power in China

promoting independence of the standard and facilitating the "go global" of China’s nuclear power.