Electric smelting forming method of CAP1400 main steam pipe penetration piece

Abstract

The invention provides an electric smelting forming method of a CAP1400 main steam pipe penetration piece which is efficient, low in cost and excellent in mechanical properties. According to the method, an electric smelting head and a substrate are connected to the two poles of a power source; while forming, a metal raw material wire is conveyed to the surface of the substrate by a conveying mechanism and the electric smelting head; under the protection of the accumulation of granular accessories, the electric arc is generated between the raw material wire and the substrate to melt partial surfacing accessories to form a molten slag pool; the current flows through the raw material wire and the molten slag pool to form resistance heat and electro-slag heat; under the actions of the three composite high-energy heat sources, namely the electric arc heat, the resistance heat and the electro-slag heat, the raw material wire is melted to form a local molten pool on the surface of the substrate; the raw material wire and the accessories are fed continuously; the relative movement of the electric smelting head and the substrate is controlled by a computer according to the stratified slicing data of a formed part so as to realize quick cooling and layer-by-layer solidification accumulation of the molten pool on the substrate, and finally, the main steam pipe penetration piece is formed by virtue of layer-by-layer accumulation.

Description

technical field [0001] The invention relates to an electrofusion forming method for a penetrating part of a CAP1400 main steam pipe. Background technique [0002] The main steam pipe penetration of nuclear power runs across the inside and outside of the CV (steel containment vessel). It is a key component to ensure that the cooling water of the secondary circuit is evaporated into steam after heat exchange with the high-pressure water of the primary circuit to drive the steam turbine to do work to achieve power generation. It is the key component that connects the nuclear island and the conventional island. The key components of the nuclear power plant are subject to harsh working environment and safety requirements. Therefore, the research and development and preparation of pipeline materials has always been one of the major research projects for nuclear power main equipment materials. The CAP1400 unit independently developed by my country based on the AP1000 puts forward h...

AI Technical Summary

Problems solved by technology

However, the process pipe of the main steam penetration part is hollow inside (inner diameter = 956.8), which needs to be hollowed out by machining, which has the disadvantages of large machining volume and low utilization rate of forgings.

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