CN102828140A - Laser cladding repair process for valve seat - Google Patents
Laser cladding repair process for valve seat Download PDFInfo
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- CN102828140A CN102828140A CN2012103512816A CN201210351281A CN102828140A CN 102828140 A CN102828140 A CN 102828140A CN 2012103512816 A CN2012103512816 A CN 2012103512816A CN 201210351281 A CN201210351281 A CN 201210351281A CN 102828140 A CN102828140 A CN 102828140A
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- valve seat
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- failure analysis
- valve
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Abstract
The invention relates to a laser cladding repair process for a valve seat, which comprises the following steps: (A) treating the surface of the valve seat according to the failure analysis result of the valve seat, and performing failure analysis on the valve seat; (B) optimizing technological parameter and performing laser cladding on the valve seat based on the failure analysis result of the valve seat, the powdered alloy adopted is prepared from the following components in percentage by weight: 0.5-1% of carbon, 19-23% of chromium, 1.5-2% of boron, 1-3% of silicon, 0.05-0.5% of molybdenum, 0.05-0.5% of manganese, 7-9% of wolframium, 2.5-4% of nickel and the balance of cobalt; and (C) performing detection. The surface of the valve seat is subjected to laser cladding through laser repair technology, so that the size of the valve seat is recovered to operating requirement, and the corrosion resistance and abrasive resistance of the valve seat repaired exceed its original performance.
Description
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 that uses in the petroleum chemical industry is because its performance characteristics requires than higher anti-corrosion, wear resistance.At present, the equipment great majority of domestic petrochemical enterprise are import equipments, when wearing and tearing, burn into vaporization appear in valve seat, will drop into very big cost and go abroad and order goods or maintenance, have increased burden to enterprise economically.
Laser melting coating is meant that placing selecteed coated material on by the cladding matrix surface with different adding material modes makes it to melt simultaneously with the matrix surface skim through laser irradiation; And it is extremely low to form extent of dilution behind the rapid solidification; Become the top coat of metallurgical binding with matrix; Significantly improve the process method of wear-resisting, anti-corrosion, heat-resisting, the anti-oxidant and electrical specification of substrate surface, thereby reach the purpose of surface-treated 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 characteristics such as matrix bond is good, be fit to that cladding material is many, granularity and content are big.
Owing to repair the valve seat of petroleum chemical industry, wettability, wear resistance, the solidity to corrosion of cladding layer all required high, so how with the laser melting and coating technique effective application in the valve seat reparation, be the problem that those skilled in the art need solve.
Summary of the invention
The technical problem that the present invention will solve provides a kind ofly carries out laser melting coating to valve base surface, makes its size restoration to request for utilization, 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, may further comprise the steps:
A. valve base surface is handled, valve seat is carried out failure analysis;
B. according to the failure analysis result of valve seat, optimize processing parameter, carry out laser melting coating;
The mode of powder feeding is preset in employing; With the fast-transverse-flow CO is that light source overlaps scanning continuously to valve seat, and laser power is 1700W to 2100W, and 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 that is adopted 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;
C. detect.
In order to make valve seat to be repaired in the process of laser melting coating, repair successfully, and obtain better repairing effect, a kind of optimized technical scheme is: above-mentioned steps A removes the dust on the valve seat, greasy dirt, corrosion; Detect the size at each position of valve seat, confirm failure site and abrasion loss thereof, confirm the valve seat deflection; Remove the fatigue layer 0.5mm to 2mm of valve seat failure site, and clean.
For the quality of the valve seat after guaranteeing to repair, a kind of optimized technical scheme is: above-mentioned steps C detects valve base surface hardness; Detect the valve seat deflection; Valve base surface is carried out mechanical workout; Detect a flaw, verification.
Technique scheme of the present invention is compared prior art and is had the following advantages:
(1) adopts homemade Co-based alloy powder in the laser repairing process of valve seat of the present invention, through the content of strict control C, make it have good wettability in the composition of powdered alloy, in cladding process, crack and pore preventing; Simultaneously to make alloy be main matrix solidifying that the back forms with the austenite through adding an amount of B, Si in the powdered alloy, satisfying its hardness requirement, and makes powdered alloy have good self-fluxing nature; Proper C r, Mo, Mn, W, Ni element have carried out alloy strengthening to cobalt base alloy in addition; Under the prerequisite that does not influence weldableness; 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 request for utilization.
(2) laser repairing process of valve seat of the present invention adopts the broad band laser bundle, and efficient is higher; The mode of powder feeding is preset in employing, and strict control powder sending quantity, and laser power, sweep velocity, amount of lap etc. are optimized makes that the homogeneity of structure of cladding layer is good, thickness and even hardness.This technology makes that the fusion rate of cladding layer and the matrix of valve seat failure site is high, combines closely, and the valve seat deflection is little, and valve base surface does not have crackle and pore, and the hardness height has excellent abrasion resistance.
(3) laser repairing process of valve seat of the present invention is because the powdered alloy weldableness that is adopted is good; And the processing parameter of laser melting coating is optimized; Need not preheating before the laser melting coating, need not to be incubated after the laser melting coating, more need not to anneal; Under the prerequisite that guarantees repairing quality, technical process is succinct relatively.
Embodiment
The concrete steps of the laser repairing process of the valve seat of present embodiment are following:
A. valve base surface to be repaired is handled, valve seat is carried out failure analysis.
With removings such as the dust on the valve seat, greasy dirt, corrosions; Detect the size at each position of valve seat, confirm failure site and abrasion loss thereof, whether the check valve seat has metamorphism; Remove the fatigue layer 0.5mm of valve seat failure site through polishing, and clean.
B. according to the failure analysis result of valve seat, optimize processing parameter, carry out laser melting coating.
The mode of powder feeding is preset in employing, and being light source with the fast-transverse-flow CO overlaps scanning continuously to the position to be repaired of valve seat, and laser power is 1900W; Absolute altitude (is that laser apparatus leaves the distance between the 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 that is adopted 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 repairing end, detect.
Detect surface hardness; Detect deflection; Valve base surface is carried out mechanical workout; Whether detect a flaw, detecting has pore, slag inclusion, slight crack etc. to influence the defective of valve seat mechanical property; Carry out verification, whether quality inspection is qualified.
Obviously, the foregoing description only be for clearly the present invention is described and is done for example, and be not to be qualification to embodiment of the present invention.For the those of ordinary skill in affiliated field, on the basis of above-mentioned explanation, can also make other multi-form variation or change.Here need not also can't give exhaustive to all embodiments.And these belong to conspicuous variation or the change that spirit of the present invention extended out and still are among protection scope of the present invention.
Claims (3)
1. the laser repairing process of a valve seat is characterized in that, may further comprise the steps:
A. valve base surface is handled, valve seat is carried out failure analysis;
B. according to the failure analysis result of valve seat, optimize processing parameter, carry out laser melting coating;
The mode of powder feeding is preset in employing; With the fast-transverse-flow CO is that light source overlaps scanning continuously to valve seat, and laser power is 1700W to 2100W, and 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 that is adopted 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;
C. detect.
2. according to the laser repairing process of the described valve seat of claim 1, it is characterized in that: said steps A is that the dust on the valve seat, greasy dirt, corrosion are removed; Detect the size at each position of valve seat, confirm failure site and abrasion loss thereof, confirm the 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 the described valve seat of claim 1, it is characterized in that: said step C detects valve base surface hardness; Detect the valve seat deflection; Valve base surface is carried out mechanical workout; Detect a flaw, verification.
Priority Applications (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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103512816A CN102828140A (en) | 2012-09-20 | 2012-09-20 | Laser cladding repair process for valve seat |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310239606.6A Division 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102828140A true CN102828140A (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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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 |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
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| 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 (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107803611A (en) * | 2016-09-08 | 2018-03-16 | 丰田自动车株式会社 | Engine valve cobalt-based hardfacing alloy and engine |
| CN108085648A (en) * | 2017-12-07 | 2018-05-29 | 中国石油天然气股份有限公司 | A kind of water-flooding pump for oil field failure combination valve repairing and reusing method |
| 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 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104018892B (en) * | 2014-05-28 | 2015-10-28 | 中广核核电运营有限公司 | The restorative procedure of turbine high-pressure steam valve valve bonnet seal face pit |
| 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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| US20040134887A1 (en) * | 2003-01-09 | 2004-07-15 | General Electric Company | Method of weld repariing a component and component repaired thereby |
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| CN102220522A (en) * | 2011-06-02 | 2011-10-19 | 沈阳大陆激光技术有限公司 | Cobalt-based alloy powder for laser remanufacturing of housing of rolling mill |
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- 2012-09-20 CN CN2012103512816A patent/CN102828140A/en active Pending
- 2012-09-20 CN CN201310239606.6A patent/CN103668036B/en active Active
Patent Citations (5)
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| US20040134887A1 (en) * | 2003-01-09 | 2004-07-15 | General Electric Company | Method of weld repariing a component and component repaired thereby |
| CN101787529A (en) * | 2010-03-18 | 2010-07-28 | 安徽米特吉激光科技有限公司 | Laser restoring method of aircraft engine cylinder body |
| CN101974751A (en) * | 2010-07-06 | 2011-02-16 | 山东建能大族激光再制造技术有限公司 | Method for repairing speed reduction gearbox hole |
| CN102002707A (en) * | 2010-11-25 | 2011-04-06 | 秦皇岛洪川实业有限公司 | Laser repairing method of damaged finishing roller |
| CN102220522A (en) * | 2011-06-02 | 2011-10-19 | 沈阳大陆激光技术有限公司 | Cobalt-based alloy powder for laser remanufacturing of housing of rolling mill |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107803611A (en) * | 2016-09-08 | 2018-03-16 | 丰田自动车株式会社 | Engine valve cobalt-based hardfacing alloy and engine |
| CN108085648A (en) * | 2017-12-07 | 2018-05-29 | 中国石油天然气股份有限公司 | A kind of water-flooding pump for oil field failure combination valve repairing and reusing method |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103668036A (en) | 2014-03-26 |
| CN103668036B (en) | 2016-05-25 |
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Application publication date: 20121219 |