Nickel-based bare wire resisting point defects and crack defects

Abstract

The invention relates to a nickel-based bare wire resisting point defects and crack defects, which belongs to the technical field of welding materials, is applicable to main nuclear island equipment and solves the problem of welding defects frequently occurring in field welding of an existing wire. In weight percent, basic chemical components of the nickel-based bare wire include less than 0.04% of C (carbon), less than 0.5% of Si (silicon), 28.0-31.5% of Cr (chromium), less than 1.0% of Mn (manganese), 0.50-1.0% of Nb (niobium), less than 0.30% of Al (aluminum), less than 0.40% of Ti (titanium), 1.0-1.5% of Al+Ti+Nb, 7.0-11.0% of Fe (ferrum), less than 0.02% of Cu (copper), less than 0.005% of S (sulfur), less than 0.005% of P (phosphorus), less than 0.05% of Co (cobalt), less than 0.02% of Ta (tantalum), less than 0.5% of Mo (molybdenum), less than 0.005% of Ca (calcium), less than 0.005% of Mg (magnesium), less than 0.001% of B (boron), less than 0.02% of Zr (zirconium), less than 0.02% of N (nitrogen), less than 0.01% of O (oxygen), the balance Ni (nickel) and less than 0.1% of all other impurity elements. The room-temperature yield strength sigma 0.2 of weld deposit metal of the bare wire is larger than or equal to 240MPa, the tensile strength sigma b of the bare wire is larger than or equal to 550MPa, the elongation A% of the bare wire is larger than or equal to 30%, the 350 DEG C yield strength sigma 0.2 of the weld deposit metal of the bare wire is larger than or equal to 90MPa, and the room-temperature impacting energy Akv of the bare wire is larger than or equal to 70J. Arc is stable during welding, the defects are fewer, and process performances are fine.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to a nickel-based smooth welding wire resistant to point defects and crack defects, which can be used for welding low-alloy steel, stainless steel and nickel-based alloys. In particular, it is a light welding wire specially used for nuclear island main equipment, such as reactor pressure vessel welding including driving tube seat, taking over safety end, and core support block welding. Background technique [0002] With the development of the nuclear industry, nickel-based alloys are more and more widely used in nuclear power equipment. Nickel-based alloy welding materials have also been widely used. The nickel-based alloy used for the main equipment of the nuclear island is Ni60-Cr30-Fe7 alloy, which is a nickel-based alloy with good corrosion resistance. The base material is developed by further increasing the Cr content on the basis of Ni75-Cr15-Fe3 alloy. Yes, the we...

AI Technical Summary

Problems solved by technology

[0007] Through literature and patent retrieval, it is found that only the French patent report can reduce the defects in the welding process by adding Mo elements, but it mainly controls the I-type and II-type cracks produced in the welding process, and has not found that the present invention refers to Welding wire resistant to point defects and boron-induced crack defects

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