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A process method for intensified remanufacturing of damaged parts on the inner surface of metal pipes

A technology of metal pipes and process methods, applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of bulky and bulky equipment, inability to adapt to repair, and inability to guarantee the bonding strength of coating and substrate, etc., to achieve Good corrosion resistance and high bonding strength

Active Publication Date: 2021-03-23
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiencies in the prior art, the present invention provides a process method for strengthening and remanufacturing the damaged part of the inner surface of the metal pipe, so as to solve the problem that the required equipment is too large when applying the coating. It is bulky and unable to adapt to the repair of damaged parts in the special environment inside the pipeline. It overcomes the disadvantage that the existing coating technology cannot guarantee a good bonding strength between the coating and the substrate during coating, and is specially designed for 304SS with an inner diameter greater than 15cm. And inside the 316L stainless steel pipe, a special nickel-based alloy material has been developed and a complete enhanced remanufacturing process has been provided, thereby realizing the enhanced remanufacture of the damaged part of the inner wall of the 304SS and 316L stainless steel pipe

Method used

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  • A process method for intensified remanufacturing of damaged parts on the inner surface of metal pipes

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Effect test

Embodiment 1

[0029] Example 1: The process parameters selected during deposition strengthening are as follows: the electrode rod made of the processed nickel-based alloy material is used as the positive electrode, the metal pipe is used as the negative electrode, and an argon gas flow with a flow rate of 200-1000ml / min is assisted to make the coating The material can completely isolate oxygen during the deposition process to ensure the quality of coating strengthening. A unidirectional pulse power supply is used for the deposition power supply. Firstly, the rated deposition power is designed to be 1500W, the deposition time is 3min, the deposition voltage is set to 70V, the current pulse width is 300μs, the frequency is 400Hz, the electrode rotation speed is 1500r / min, and the duty cycle With a ratio of 10%, a coating thickness of 35 μm was obtained.

Embodiment 2

[0030] Embodiment 2: The process parameters selected during deposition strengthening are as follows: the electrode rod made of the processed nickel-based alloy material is used as the positive electrode, and the metal pipe is used as the negative electrode. The argon gas flow with a flow rate of 200-1000ml / min is assisted, so that the coating material can completely isolate oxygen during the deposition process and ensure the quality of coating strengthening. A unidirectional pulse power supply is used for the deposition power supply. Firstly, the rated deposition power is 1500W, the deposition time is 4min, the deposition voltage is 80V, the current pulse width is 300μs, the frequency is 500Hz, and the electrode rotation speed is 2000r / min. With a ratio of 10%, a coating thickness of 55 μm was obtained.

Embodiment 3

[0031] Embodiment 3: The process parameters selected during deposition strengthening are as follows: the electrode rod made of the processed nickel-based alloy material is used as the positive electrode, the metal pipe is used as the negative electrode, and the argon gas flow with a flow rate of 200-1000ml / min is assisted to make the coating The material can completely isolate oxygen during the deposition process to ensure the quality of coating strengthening. The deposition power supply uses a unidirectional pulse power supply. Firstly, the rated deposition power is designed to be 1500W, the deposition time is 5min, the deposition voltage is set to 90V, the current pulse width is 400μs, the frequency is 600Hz, and the electrode rotation speed is 3500r / min. With a ratio of 10%, a coating thickness of 80 μm was obtained.

[0032] The invention is suitable for the repair of internal damaged parts of 304SS and 316L stainless steel pipelines with an inner diameter of more than 15c...

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Abstract

The invention relates to a technical method for reinforcing and re-manufacturing damaged positions on an inner surface of a metal pipeline. In the method, a high-energy micro-arc-type spray gun trolley being movable and allowing accurate positioning moves, lifts and swings freely and flexibly in the pipeline, thus achieving three-dimensional localization inside the pipeline. With an electrode rod,made from a nickel alloy material, being a positive pole and the metal pipeline being a negative pole, reinforcement and re-manufacturing of damaged positions, in different shapes, on the inner surface of the metal pipeline are carried out under protection by inert gas at certain flow rate. The coating layer and the substrate are combined metallurgically to a high combining strength, so that therepaired coating material has excellent corrosion resistance and hardness, thus solving a problem of difficulty of repairing the inner surface of the metal pipeline. The method has simple operations and high efficiency and is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of damage repair and strengthening of the inner wall of metal pipes, in particular to a process method for strengthening and remanufacturing the damaged parts on the inner surface of metal pipes, especially suitable for strengthening and remanufacturing the damaged parts on the inner surface of 304SS and 316L stainless steel pipes with inner diameters greater than 15 cmm . Background technique [0002] In all aspects of people's daily production and life, metal pipes are needed to transport certain substances. According to statistical data, pipelines have become the fifth largest means of transportation after railways, highways, waterways, and air transportation. , economic losses, and even unpredictable threats to life, it can be seen that the extension of pipeline life and the repair and reuse of damaged pipelines have become very urgent and very important. However, the surroundings of the pipeline are g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/16C23C4/131C22C19/05
CPCC22C19/057C23C4/06C23C4/16
Inventor 吕彦立罗亮刘渝林刘茂槐周露妍江健潘太军史先传
Owner CHANGZHOU UNIV