A kind of high mn and high nb crack-resistant nickel-based welding wire and its welding method

Abstract

The invention provides a high-Mn and high-Nb anti-crack-defect nickel-based welding wire and a welding method. The high-Mn and high-Nb anti-crack-defect nickel-based welding wire comprises, by weight, less than 0.04% of C, 0.10-0.20% of Si, 3.8-4.2% of Mn, less than 0.003% of S, less than 0.003% of P, 28.0-31.5% of Cr, less than 0.01% of Mo, less than 0.05% of Cu, 2.2-2.5% of Nb, 0.4-0.9% of Ti, less than 0.50% of Al, 8.5-10.5% of Fe, less than 0.005%of Ca, less than 0.005% of Mg, less than 0.005% of O, 0.20-0.40% of N, less than 0.001% of B, less than 0.005% of Zr, less than 0.02% of Ta, and the balance of Ni, wherein the sum of the Mn and Nb is 6.2-6.6%; the sum of other impurity elements is less than 0.10%. The welding wire is suitable for welding of nuclear island main equipment (including bead welding of pressure vessel drive tube sockets, connection tube safety ends, reactor core bearing blocks and steam generator tube plates and welding of tubes and tube plates), and the problem that an existing welding wire is prone to having a crack defect under the field welding and other severe conditions is solved.

Description

technical field [0001] The invention relates to a welding wire, specifically a nickel-based welding wire. Background technique [0002] In the 1950s, the original steam generator used Inconel 600 alloy as the heat transfer tube material, so the tube plate was surfacing with ERNiCr-3 welding material (Inconel 82), and ERNiCr-3 welding material was also used for the heat transfer tube Welding with surfacing. However, intergranular stress corrosion cracks (IGSCC) were found in the above welds, so new heat transfer tube materials were developed. After a period of research, in the 1980s, Inconel 690 alloy was used as the heat transfer tube material. , and use ERNiCrFe-7 (Inconel 52) welding consumables for surfacing and welding. The chromium content of this material reaches about 30%, so the generation of intergranular stress corrosion cracks is effectively avoided. But in recent years, the U.S. Navy has discovered another defect called DDC in the welds of Inconel 52. Later, ...

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Problems solved by technology

[0003] The object of the present invention is to provide a high Mn and high Nb anti-crack defect nickel-based welding wire which is suitable for the welding of the main equipment of the nuclear island and solves the problem that the current welding wire is prone to crack defects under harsh conditions such as on-site welding.

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