Electrofusion Forming Method for Nuclear Power Station Voltage Stabilizer Cylinder

Abstract

An electric melting method for forming a nuclear power plant voltage regulator cylinder: a high-energy heat source formed by combining electric arc heat, resistance heat, and electroslag heat is employed to melt a continuously conveyed raw material metal wire (1), which is solidified and deposited layer-by-layer on a substrate (2) to form a manufactured metal structure; an electric melting head (6) and a substrate (2) are connected to either electrode of a power source, when forming, the raw material metal wire (1) is fed to a surface of the substrate (2) via a conveyor mechanism (5) and the electric melting head (6), under the protection of a stack of a granular auxiliary material (3), an electric arc (9) is produced between the raw material wire (1) and the substrate (2) to partly melt the surfacing auxiliary material (3) to form a molten slag pool (8), an electric current flows through the raw material wire (1) and the molten auxiliary material slag pool (8) to form resistance heat and electroslag heat, the raw material wire (1) is molten under the effect of the high-energy heat source combining the electric arc heat, the resistance heat, the electroslag heat, a partly molten pool (11) is formed on the surface of the substrate (2), conveyance of the raw material wire (1) and the auxiliary material (3) is continued, a computer is employed to control relative movements of the electric melting head (6) and of the substrate (2) on the basis of layer slicing data of a forming component, rapid cooling and layer-by-layer solidification and deposition of the molten pool on the substrate (2) is implemented, and finally, the voltage regulator cylinder is formed by layer-by-layer deposition.

Description

technical field [0001] The invention relates to an electromelting forming method for a cylinder body of a voltage stabilizer of a nuclear power plant. Background technique [0002] The voltage stabilizer is one of the core equipment in the primary circuit system of a nuclear power plant, and is a key component for stabilizing the pressure and temperature of the primary circuit. With the nuclear power working environment and extreme safety requirements, the requirements for the preparation process of voltage stabilizer equipment materials are getting higher and higher. [0003] The material used for the equipment adopts ASME standard SA508Gr3Cl2 or RCC-M standard 18MnD5 low-alloy high-strength steel (China’s corresponding standard 20MnMoNi). In order to ensure the quality requirements of the material, the current barrel components of the voltage stabilizer have been changed from the original steel plate coil welding to forging. , and subsequent heat treatment and machining f...

AI Technical Summary

Problems solved by technology

This method is widely used in production and can also meet the quality requirements, but for the gradually increasing demand for single material parts, forging, especially heat treatment, is prone to problems such as very uneven macroscopic material phase structure.

The process is complex and the control of chemical and mechanical properties is difficult, which also results in poor quality stability and high scrap rate

At the same time, judging from the final grain measurement results of this process, it is generally only about 5-7 grades. For the purpose of improving the mechanical properties, especially the comprehensive performance of strength and toughness, by further refining the grains in the current research and development and production, this Process has a big bottleneck

[0005] In addition, the method of segmented material forging and tailor welding adopted by the voltage stabilizer equipment splits the continuous direction of the mechanical fibers, which greatly affects the mechanical properties of the material and the safety of the container equipment

And it is also very easy to cause delays in the manufacturing period and increase the cost

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