CN103668036A - Laser cladding repairing process of valve seat with high hardness and less deformation - Google Patents
Laser cladding repairing process of valve seat with high hardness and less deformation Download PDFInfo
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- CN103668036A CN103668036A CN201310239606.6A CN201310239606A CN103668036A CN 103668036 A CN103668036 A CN 103668036A CN 201310239606 A CN201310239606 A CN 201310239606A CN 103668036 A CN103668036 A CN 103668036A
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Abstract
The invention relates to a laser cladding repairing process of a valve seat. The process comprises the following steps: A, treating the surface of the valve seat, and carrying out failure analysis on the valve seat; B, optimizing the technical parameters for laser cladding according to the failure analysis results of the valve seat, wherein the alloy powder adopted comprises the following components in percentage by weight: 0.5-1% of C, 19-23% of Cr, 1.5-2% of B, 1-3% of Si, 0.05-0.5% of Mo, 0.05-0.5% of Mn, 7-9% of W, 2.5-4% of Ni and the balance of C; and C, detecting. According to the laser cladding repairing process of the valve seat, laser cladding is carried out on the surface of the valve seat, so that the size of the valve seat is recovered to meet the using demands, and the corrosion resistance and wear resistance of the repaired valve seat exceed the original performances.
Description
The application divides an application, the application number of original application: 201210351281.6, the applying date: 2012-09-20, the laser cladding repair technique > > of invention and created name < < valve seat.
Technical field
The present invention relates to a kind of laser cladding method, especially a kind of laser melting coating restorative procedure of valve seat.
Background technology
The valve seat using in petroleum chemical industry, due to its performance characteristics, requires higher to anti-corrosion, wear resistance.At present, the equipment great majority of domestic petrochemical enterprise are import equipments, will drop into very large cost and go abroad and order goods or maintenance when wearing and tearing, burn into vaporization appear in valve seat, have increased burden economically to enterprise.
Laser melting coating refers to that with different adding material modes, place selecteed coated material on by cladding matrix surface makes it to melt with matrix surface skim through laser irradiation simultaneously, and it is extremely low after rapid solidification, to form extent of dilution, become the top coat of metallurgical binding with matrix, significantly improve the processing method of wear-resisting, anti-corrosion, heat-resisting, the anti-oxidant and electrical specification of substrate surface, thereby reach the object of surface modification or reparation.With built-up welding, spraying, plating and gas phase sediment-filled phase ratio, laser melting coating has that extent of dilution is little, dense structure, coating and matrix is combined, be applicable to that cladding material is many, granularity and the feature such as content is large.
Owing to repairing the valve seat of petroleum chemical industry, the wettability of cladding layer, wear resistance, solidity to corrosion are all required high, so how laser melting and coating technique is effectively applied to valve seat reparation, be the problem that those skilled in the art need to solve.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind ofly carries out laser melting coating to valve base surface, makes its size restoration to service requirements, and the solidity to corrosion after repairing and the wear resistance laser cladding repair technique that all surpasses the valve seat of original performance.
In order to solve the problems of the technologies described above, the invention provides a kind of laser repairing process of valve seat, comprise the following steps:
A. valve base surface is processed, valve seat is carried out to failure analysis;
B. according to the failure analysis result of valve seat, Optimizing Process Parameters, carries out laser melting coating;
Adopt the mode of preset powder feeding, the fast-transverse-flow CO2 laser of take carries out lap connection scanning to valve seat as light source, laser power is 1700W to 2100W, absolute altitude is 260mm to 275mm, spot size is 10mm * 1.8mm, sweep velocity is 110mm/min to 130mm/min, and amount of lap is 6.5mm, and powder sending quantity is 10g/min to 15g/min; The component of the powdered alloy adopting and weight percent content are C:0.5% to 1%, Cr:19% to 23%, and B:1.5% to 2 %, Si:1% to 3%, Mo:0.05% to 0.5%, Mn:0.05% to 0.5%, W:7% to 9%, Ni:2.5% to 4%, all the other are Co;
As the embodiment of optimizing, adopt the mode of preset powder feeding, the fast-transverse-flow CO2 laser of take carries out lap connection scanning to valve seat as light source, laser power is 1900W, absolute altitude is 270mm, and spot size is 10mm * 1.8mm, and sweep velocity is 120 mm/min, amount of lap is 6.5mm, and powder sending quantity is 12g/min; The component of the powdered alloy adopting and weight percent content are C:1%, Cr:21%, and B:2%, Si:2%, Mo:0.2%, Mn:0.2%, W:8%, Ni:3%, all the other are Co;
C. detect.
For valve seat to be repaired is repaired successfully in the process of laser melting coating, and obtain better repairing effect, a kind of preferred technical scheme is: above-mentioned steps A removes the dust on valve seat, greasy dirt, corrosion; Detect the size at each position of valve seat, determine failure site and abrasion loss thereof, determine valve seat deflection; Remove the fatigue layer 0.5mm to 2mm of valve seat failure site, and clean.
In order to guarantee the quality of the valve seat after reparation, a kind of preferred technical scheme is: above-mentioned steps C detects valve base surface hardness; Detect valve seat deflection; Valve base surface is carried out to mechanical workout; Detect a flaw, verification.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) in the laser repairing process of valve seat of the present invention, adopt homemade Co-based alloy powder, in the composition of powdered alloy, by the strict content of controlling C, make it have good wettability, in cladding process, crack and pore preventing; Simultaneously in powdered alloy, by adding appropriate B, Si, alloy to be formed after solidifying take austenite be the matrix of leading, and to meet its hardness requirement, and makes powdered alloy have good self-fluxing nature; Appropriate Cr, Mo, Mn, W, Ni element have carried out alloy strengthening to cobalt base alloy in addition, do not affecting under the prerequisite of weldability, can be so that valve seat solidity to corrosion and wear resistance after repairing improve greatly, and hardness can reach 50HRC to 55HRC and meets service requirements.
(2) laser repairing process of valve seat of the present invention adopts broad band laser bundle, and efficiency is higher; Adopt the mode of preset powder feeding, strictly control powder sending quantity, and laser power, sweep velocity, amount of lap etc. are optimized, make the homogeneity of structure of cladding layer good, thickness and hardness even.This technique make the fusion rate of matrix of cladding layer and valve seat failure site high, in conjunction with closely, valve seat deflection is little, valve base surface does not have crackle and pore, hardness is high, has fabulous wear resistance.
(3) laser repairing process of valve seat of the present invention is because adopted powdered alloy weldability is good, and the processing parameter of laser melting coating is optimized, laser melting coating is before without preheating, laser melting coating is afterwards without being incubated, more without annealing, guaranteeing that under the prerequisite of repairing quality, technical process is relatively succinct.
Embodiment
The concrete steps of the laser repairing process of the valve seat of the present embodiment are as follows:
A. valve base surface to be repaired is processed, valve seat is carried out to failure analysis.
By removings such as the dust on valve seat, greasy dirt, corrosions; Detect the size at each position of valve seat, determine failure site and abrasion loss thereof, whether check valve seat has metamorphism; By polishing, remove the fatigue layer 0.5mm of valve seat failure site, and clean.
B. according to the failure analysis result of valve seat, Optimizing Process Parameters, carries out laser melting coating.
Adopt the mode of preset powder feeding, the fast-transverse-flow CO2 laser of take carries out lap connection scanning to the position to be repaired of valve seat as light source, laser power is 1900W, absolute altitude (is that laser apparatus is from the distance between Substrate, absolute altitude=focal length+defocusing amount) be 270mm, spot size is 10mm * 1.8mm, and sweep velocity is 120 mm/min, amount of lap is 6.5mm, and powder sending quantity is 12g/min.The component of the powdered alloy adopting and weight percent content are C:1%, Cr:21%, and B:2%, Si:2%, Mo:0.2%, Mn:0.2%, W:8%, Ni:3%, all the other are Co.
C., after reparation finishes, detect.
Detect surface hardness; Detect deflection; Valve base surface is carried out to mechanical workout; Detect a flaw, detect and whether have pore, slag inclusion, slight crack etc. to affect the defect of valve seat mechanical property; Carry out verification, whether quality inspection is qualified.
Obviously, above-described embodiment is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And these belong to apparent variation that spirit of the present invention extended out or change still among protection scope of the present invention.
Claims (3)
1. a laser repairing process for valve seat, is characterized in that, comprises the following steps:
A. valve base surface is processed, valve seat is carried out to failure analysis;
B. according to the failure analysis result of valve seat, Optimizing Process Parameters, carries out laser melting coating;
Adopt the mode of preset powder feeding, the fast-transverse-flow CO2 laser of take carries out lap connection scanning to valve seat as light source, and laser power is 1900W, absolute altitude is 270mm, and spot size is 10mm * 1.8mm, and sweep velocity is 120 mm/min, amount of lap is 6.5mm, and powder sending quantity is 12g/min; The component of the powdered alloy adopting and weight percent content are C:1%, Cr:21%, and B:2%, Si:2%, Mo:0.2%, Mn:0.2%, W:8%, Ni:3%, all the other are Co;
C. detect.
2. according to the laser repairing process of valve seat claimed in claim 1, it is characterized in that: described steps A is that the dust on valve seat, greasy dirt, corrosion are removed; Detect the size at each position of valve seat, determine failure site and abrasion loss thereof, determine valve seat deflection; Remove the fatigue layer 0.5mm to 2mm of valve seat failure site, and clean.
3. according to the laser repairing process of valve seat claimed in claim 1, it is characterized in that: described step C detects valve base surface hardness; Detect valve seat deflection; Valve base surface is carried out to mechanical workout; Detect a flaw, verification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310239606.6A CN103668036B (en) | 2012-09-20 | 2012-09-20 | The laser cladding repair technique of the valve seat that hardness is high and deflection is little |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103512816A CN102828140A (en) | 2012-09-20 | 2012-09-20 | Laser cladding repair process for valve seat |
| CN201310239606.6A CN103668036B (en) | 2012-09-20 | 2012-09-20 | The laser cladding repair technique of the valve seat that hardness is high and deflection is little |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2012103512816A Division CN102828140A (en) | 2012-09-20 | 2012-09-20 | Laser cladding repair process for valve seat |
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| Publication Number | Publication Date |
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| CN103668036A true CN103668036A (en) | 2014-03-26 |
| CN103668036B CN103668036B (en) | 2016-05-25 |
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| CN2012103512816A Pending CN102828140A (en) | 2012-09-20 | 2012-09-20 | Laser cladding repair process for valve seat |
| CN201310239606.6A Active CN103668036B (en) | 2012-09-20 | 2012-09-20 | The laser cladding repair technique of the valve seat that hardness is high and deflection is little |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104018892A (en) * | 2014-05-28 | 2014-09-03 | 中广核核电运营有限公司 | Repairing method of valve cover sealing face pit of steam turbine high-pressure steam valve |
| CN113621853A (en) * | 2021-08-18 | 2021-11-09 | 沈阳大陆激光先进制造技术创新有限公司 | Alloy material for laser manufacturing and remanufacturing of minimum flow valve core of power plant and preparation method thereof |
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| CN104874793A (en) * | 2015-05-27 | 2015-09-02 | 机械科学研究总院先进制造技术研究中心 | Three-dimensional printing direct manufacturing method of engine cylinder head valve seat |
| JP2018039037A (en) * | 2016-09-08 | 2018-03-15 | トヨタ自動車株式会社 | Cobalt-base build-up alloy for engine valve and engine |
| CN108085648A (en) * | 2017-12-07 | 2018-05-29 | 中国石油天然气股份有限公司 | Method for repairing and recycling failed combined valve of water injection pump in oil field |
| CN108165982A (en) * | 2017-12-22 | 2018-06-15 | 北京机科国创轻量化科学研究院有限公司 | A kind of method that superelevation rate laser melting coating prepares nickel-base antiwear anti-corrosion coating |
| CN108422150A (en) * | 2018-04-23 | 2018-08-21 | 广汉川油井控装备有限公司 | A kind of restorative procedure of cock valve core and plug valve |
| CN110424009A (en) * | 2019-08-28 | 2019-11-08 | 燕山大学 | A method of strengthening PTA ball seat using laser cladding |
| CN114959684A (en) * | 2022-05-18 | 2022-08-30 | 广东核电合营有限公司 | Method for repairing sealing surface of main valve seat of valve |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103668036B (en) | 2016-05-25 |
| CN102828140A (en) | 2012-12-19 |
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Effective date of registration: 20221206 Address after: 276000 Middle section of Yanbin Road, Biomedical Industrial Park, Feixian Economic Development Zone, Linyi City, Shandong Province Patentee after: Kangquan Medical Products (Shandong) Co.,Ltd. Address before: 212000 Yunhe Congyang Village, Lvcheng Town, Danyang City, Zhenjiang City, Jiangsu Province Patentee before: DANYANG HONGTU LASER TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20221220 Address after: Room 210, Floor 2, Intersection Street Building, Xuyou Road and Xingda Road, Tanyi Town, Fei County, Linyi City, Shandong Province 276000 Patentee after: Linyi Talent Digital Technology Group Co.,Ltd. Address before: 276000 Middle section of Yanbin Road, Biomedical Industrial Park, Feixian Economic Development Zone, Linyi City, Shandong Province Patentee before: Kangquan Medical Products (Shandong) Co.,Ltd. |
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