High temperature resistance and oxidation resistance low expansion alloy gas shielded welding wire

Abstract

The invention relates to a welding wire for gas shielded welding of a high-temperature-resistant antioxidant low-expansion alloy. The welding wire comprises the following chemical components in percentage by weight: 0.01 to 0.10 percent of C, 4.5 to 9.0 percent of Cr, 1.0 to 2.0 percent of Co, 24.5 to 27.0 percent of Mo, 1.0 to 6.0 percent of Fe, less than or equal to 0.60 percent of Si, less than or equal to 0.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, 0.10 to 0.50 percent of Cu, less than or equal to 0.60 percent of V, less than or equal to 0.50 percent of Al, 0.002 to 0.006 percent of B and the balance of Ni. When the welding wire disclosed by the invention is used for welding the antioxidant high-temperature-resistant low-expansion alloy of a Ni-Mo-Cr system, the welding seam hot crack resistance is improved, the plasticity of a connector is improved, the equivalent tensile and lasting performance as those of a base material at room temperature or a high temperature are obtained after post-weld heat treatment. The welding wire is suitable for the gas shielded welding of the high-temperature-resistant antioxidant low-expansion alloy in aviation industry and other industrial fields.

Description

technical field [0001] The invention belongs to a welding wire used for gas-shielded welding of Ni-Mo-Cr series high-temperature-resistant, oxidation-resistant and low-expansion alloys. Background technique [0002] Aeroengines and ground gas turbines use low-expansion superalloy components to achieve active clearance control, reduce gas loss, reduce fuel consumption, and improve performance such as thrust-to-weight ratio. High-performance engines put forward higher requirements for low-expansion superalloys, not only to achieve gap control in structure, reduce gas loss and improve thermal efficiency, but also to have better temperature and oxidation resistance. The equipment also requires the engine material to have good corrosion resistance. At present, there are low-expansion superalloys GH907 and GH909 for 550-600°C and GH783 for 700°C and above. Since GH907 and GH909 do not contain chromium, and GH783 only contains 3% chromium, their oxidation resistance and corrosion...

AI Technical Summary

Problems solved by technology

In addition, due to the viscosity of the molten pool of this type of alloy, it is prone to incomplete fusion and incomplete penetration defects during welding

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