Welding rod for equipment such as primary device safety end and steam generator heat transfer pipe in pressurized water reactor power plant

Abstract

The invention discloses a welding rod for equipment such as a primary device safety end and a steam generator heat transfer pipe in a pressurized water reactor power plant. The welding rod is formed by a core wire and a coating covering the surface of the core wire, wherein the core wire is the 690 nickel base alloy core wire; and the 690 nickel base alloy core wire is prepared from the componentsin percentage by weight: less than or equal to 0.03 percent of C, 3.0 to 4.5 percent of Mn, less than or equal to 0.20 percent of Si, 29.0 to 32.0 percent of Cr, 3.0 to 6.0 percent of Fe, 0.5 to 1.0percent of Ti, 0.3 to 0.6 percent of Al, less than or equal to 0.03 percent of Co, 1.5 to 2.2 percent of Nb, less than or equal to 0.10 percent of Cu, less than or equal to 0.005 percent of S, less than or equal to 0.020 percent of P, and the balance Ni and inevitable impurities. Compared with the prior art, a welding process of the welding rod provided by the invention is excellent in performance; and the physical and chemical properties of weld metal meets the strict design requirement of the pressurized water reactor power plant.

Description

technical field [0001] The invention relates to welding materials, and more specifically, relates to a welding rod for equipment such as a safety end of main equipment of a pressurized water reactor nuclear power plant, a heat transfer tube of a steam generator, a preparation method, a welding method and a welding joint. Background technique [0002] 690 nickel-based alloy is a nickel-based alloy with high Cr content. It has excellent resistance to intergranular corrosion, crevice pitting corrosion and stress corrosion. It is currently widely used as heat transfer for steam generators (SG) in pressurized water reactor nuclear power plants. Preparation of tube material. The steam generator (SG) is a key component connecting the primary circuit and the secondary circuit of the pressurized water reactor nuclear power plant, and realizes the heat exchange process of the primary circuit and the secondary circuit through thousands of heat transfer tubes. [0003] Due to the low t...

AI Technical Summary

Problems solved by technology

[0004] Compared with general nickel-based welding consumables, 690 nickel-based alloys have higher technical requirements for supporting welding consumables, and its development difficulties are recognized internationally. The weld metal properties of companies in a monopoly position in the international field cannot fully meet the stringent design requirements of nuclear power plants.

[0005] Although CN201210282726.X (welding core, coating and electrode and preparation method thereof of nuclear-grade nickel-based electrode of basic slag system) discloses a welding core, coating and electrode of nuclear-grade nickel-based electrode, however, On the one hand, the content of C, Si, S, P, and Cu in the welding core is high, and the mutual ratio is unreasonable; on the other hand, the coating is made of alkaline coating, which results in poor arc stability and large welding spatter; It can well solve the problem of poor fluidity of the molten pool, resulting in poor uniformity of slag coverage, unclean slag removal, difficult cleaning of residue, and uneven weld formation