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Electric arc additive manufacturing method for flange part

A technology of additive manufacturing and electric arc, applied in the direction of additive manufacturing, additive processing, process efficiency improvement, etc., can solve the problems of difficult mass production, no spare parts available, long production cycle, etc., to achieve organization and plastic toughness optimization, Improvement of anisotropy and simplification of processing steps

Active Publication Date: 2017-12-15
SUZHOU NUCLEAR POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the operating cycle of nuclear power units in my country exceeds 20 years. Due to the complex working conditions of nuclear power plants, the components are required to serve safely for a long period of time under extreme conditions. As an important component of the piping system, flange components must withstand high temperature, high pressure, and corrosion. environment, so corrosion, erosion and other damage will inevitably occur and even need to be replaced, and this replacement is unplanned in many cases, and no spare parts are available
[0003] Traditional flange parts are formed by steel ingot smelting, casting, forging, etc., and undergo auxiliary heat treatment and final machining. The final performance meets the technical requirements. However, the traditional method has many manufacturing processes and long production cycles. Less, it is difficult to form batch production, resulting in high production cost and long production cycle of a single component, which will inevitably lead to extended maintenance cycle of power plant units, which will seriously affect the economics of power plant operation
[0004] As a rapid prototyping technology, additive manufacturing has been widely used in aerospace and other fields due to its high degree of manufacturing flexibility, short molding cycle, and fast processing speed. Mainly, but this type of method is limited by the space and efficiency of the equipment, it is not suitable for the additive manufacturing of large components such as flanges, and the arc additive manufacturing method can solve the problem of space and efficiency, and is suitable for the production of large components

Method used

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  • Electric arc additive manufacturing method for flange part

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Effect test

Embodiment 1

[0034] Now manufacturing DN65 stainless steel 316L flanges, offline programming to realize flange layered slicing and travel path, choose 316L substrate, argon + oxygen mixed gas protection, use 150-180A current for the bottom surface and lower neck, and the robot travel speed is 0.5-0.7m / min, overlap rate 40%-50% for spiral accumulation, the upper neck uses 120-150A current, the robot travel speed is 0.5-0.7m / min for accumulation, each layer is cleaned and polished, and the temperature between layers is monitored. Turn on the cooling device. As the printing progresses, the water level of the cooling device will gradually rise to keep the temperature below 120°C.

[0035] After the printing was completed, the excess substrate was cut off, polished for ultrasonic non-destructive testing, and no defects such as cracks, pores, and lack of fusion were found.

[0036] After the flange is dissected, the mechanical performance test is carried out. The tensile strength at room temper...

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Abstract

The invention relates to an electric arc additive manufacturing method for a flange part. The electric arc additive manufacturing method for the flange part comprises the steps that a base plate, a wire, protective gas and equipment are selected; multi-layer and multi-pass accumulation is completed on the base plate from inside to outside along a spiral path through the electric arc additive manufacturing method, so that a bottom surface and a lower neck of the flange part are manufactured; multi-layer and single-pass accumulation is completed on the lower neck along a circular path, so that an upper neck of the flange part is manufactured, and the temperature, current, overlap rate and advancing speed between the layers and the passes are controlled; and redundant portions of the base plate are cut off, solid solution treatment is conducted, the temperature and the constant-temperature time are controlled, and water cooling is conducted. According to the electric arc additive manufacturing method for the flange part, restrains from complex tools, molds and special tools are avoided, only a small degree of finish machining needs to be conducted on a formed blank, the machining procedure is greatly simplified, the manufacturing cycle of products is shortened, and customized individual production can be achieved; and the nondestructive detection quality of the formed flange part is qualified, metal is pure, the structure, the plasticity and the toughness are optimized, the anisotropy phenomenon is improved, and the performance of the flange part can meet the quality and performance requirements for similar forged pieces.

Description

technical field [0001] The invention relates to an arc additive manufacturing method for a flange. Background technique [0002] At present, the operating cycle of nuclear power units in my country exceeds 20 years. Due to the complex working conditions of nuclear power plants, the components are required to serve safely for a long period of time under extreme conditions. As an important component of the piping system, flange components must withstand high temperature, high pressure, and corrosion. Therefore, damage such as corrosion and erosion will inevitably occur and even need to be replaced, and this replacement is unplanned in many cases and no spare parts are available. [0003] Traditional flange parts are formed by steel ingot smelting, casting, forging, etc., and undergo auxiliary heat treatment and final machining. The final performance meets the technical requirements. However, the traditional method has many manufacturing processes and long production cycles. Le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/66B22F10/64B22F10/32Y02P10/25
Inventor 朱平赵建光鲁立刘彦章孙斌张峰王淦刚缪鹏
Owner SUZHOU NUCLEAR POWER RES INST
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