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Laser repair method adopting metal powder

A laser repair and metal powder technology, applied in the field of laser repair, can solve problems such as easy formation of cracks, fast heat loss, high thermal conductivity, etc., to achieve the effect of prolonging service life, saving raw materials and cost

Inactive Publication Date: 2014-12-24
JIANGSU ZHONGKESIXIANG LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty of this process lies in: 1. The hardness of the selected metal powder is above 45HRC, and the thickness of the coating should not be less than 2.5mm, which is easy to form cracks; 2. The base material of the gate valve is 25 steel, which has a high thermal conductivity and heat dissipation Dissipates quickly, becoming the second source of cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a wear-resistant and corrosion-resistant coating from Co2F powder under the condition of 650°C-800°C, the base material of the gate valve is 25 steel, and the steps are as follows:

[0020] 1. Determine the equipment parameters: use a semiconductor-pumped all-solid-state laser with a fiber core diameter of 800 μm, a collimating lens of 120 mm, and a focusing lens of 180 mm as the light source, and use a small rotating turntable on which the tooling fixture is clamped, and then the high-pressure gate valve to be repaired fixed in the fixture;

[0021] 2. Inspection of the damaged surface of the workpiece: After removing the damaged tissue on the sealing surface of the high-pressure gate valve, use a colorant to inspect the repaired part for crack defects;

[0022] 3. Fixture detection: use the tooling fixture to perform positioning detection on the high pressure gate valve;

[0023] 4) Heating: raise the temperature of the heating furnace to 500°C...

Embodiment 2

[0032] A kind of method adopts Fe45 powder to prepare wear-resisting, impact-resistant strong coating method, the base material of gate valve is 25 steel, has the following steps:

[0033] 1. Determine the equipment parameters: use a semiconductor-pumped all-solid-state laser with a fiber core diameter of 800 μm, a collimating lens of 120 mm, and a focusing lens of 180 mm as the light source, and use a small rotating turntable on which the tooling fixture is clamped, and then the high-pressure gate valve to be repaired fixed in the fixture;

[0034] 2. Inspection of the damaged surface of the workpiece: After removing the damaged tissue on the sealing surface of the high-pressure gate valve, use a colorant to inspect the repaired part for crack defects;

[0035] 3. Fixture positioning detection: use the tooling fixture to perform positioning detection on the high-pressure gate valve;

[0036] 4. Heating: raise the temperature of the heating furnace to 500°C, and place the hig...

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PUM

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Abstract

A laser repair method adopting metal powder comprises the following steps of 1 determining device parameters; 2 detecting the damaged face of a workpiece; 3 positioning and detecting the workpiece; 4 performing heating, 5 performing bottoming; 6 repairing a first layer; 7 repairing a second layer; 8 performing cooling. By means of the laser repair method, a manufacture mode of a high-pressure sluice valve is developed, a traditional 'old for new' maintenance mode is changed, and the service life of the high-pressure sluice valve is prolonged on the basis that a larger amount of raw materials and costs are saved. The problem that cracks are easily produced under the conditions of thick coating, high powder hardness and large heat loss is solved.

Description

[0001] technical field [0002] The invention belongs to the field of laser repair, and specifically relates to a laser repair method for "regenerating" the sealing surface of a failed or scrapped high-pressure gate valve through the selection of metal powder and a lap joint method designed according to the surface structure characteristics of the sealing surface of a high-pressure gate valve. Background technique [0003] Laser repair, that is, laser cladding technology. The advantages of laser cladding are mainly reflected in its highly concentrated energy density, extremely fast cooling rate (up to 105-106K / s), and the characteristics of rapid solidification. An important support for technology. At present, laser cladding technology has become one of the important means for new material preparation, rapid manufacturing of metal parts, repair and remanufacturing of failed metal parts, and has been widely used in aviation, petrochemical, automobile, machinery manufacturing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 李午红张大伟毛杰丁健王一蒋一莉
Owner JIANGSU ZHONGKESIXIANG LASER TECH