CN102828180A - Laser cladding repair process for thin-wall sleeves - Google Patents

Laser cladding repair process for thin-wall sleeves Download PDF

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Publication number
CN102828180A
CN102828180A CN201210351277XA CN201210351277A CN102828180A CN 102828180 A CN102828180 A CN 102828180A CN 201210351277X A CN201210351277X A CN 201210351277XA CN 201210351277 A CN201210351277 A CN 201210351277A CN 102828180 A CN102828180 A CN 102828180A
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China
Prior art keywords
thin
walled cover
walled
cover
laser
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Pending
Application number
CN201210351277XA
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Chinese (zh)
Inventor
邓琦林
何建方
刘少彬
刘汉杰
马万花
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DANYANG HONGTU LASER TECHNOLOGY Co Ltd
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DANYANG HONGTU LASER TECHNOLOGY Co Ltd
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Priority to CN201210351277XA priority Critical patent/CN102828180A/en
Publication of CN102828180A publication Critical patent/CN102828180A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a laser cladding repair process for thin-wall sleeves. The process comprises the following steps of: A. carrying out treatment on the surface of the thin-wall sleeve, and carrying out failure analysis; B. carrying out fixation on an inner hole of the thin-wall sleeve by using a tool; C. carrying out laser cladding, and during the laser cladding, carrying out cooling on other parts except a to-be-repaired part of the thin-wall sleeve, wherein adopted alloy powder comprises the following components in percentage by weight: less than or equal to 0.03% of C, 18-22% of Cr, 0.5-1.2% of Si, 10-15% of Ni, 2.0-3.0% of Mo, 1.0-2.0% of Mn, 1.0-2.0% of W, and the balance of Fe; D. carrying out detection; and E. simultaneously assembling and removing the tool. According to the laser cladding repair process for the thin-wall sleeves, disclosed by the invention, through carrying out the laser cladding on the surface of the thin-wall sleeve, the size of the thin-wall sleeve can be repaired to recover to meet the application requirements, the deformation of a product subjected to repair is minimum, and the hardness and the corrosion resistance of the thin-wall sleeve subjected to the repair exceeds the original hardness and the original corrosion resistance of the thin-wall sleeve.

Description

The laser cladding repair technique of thin-walled cover
Technical field
The present invention relates to a kind of laser cladding method, especially a kind of laser melting coating restorative procedure of thin-walled cover.
Background technology
Diameter 1500mm in petroleum chemical industry, thickness is widely used less than the thin-walled cover of 10mm.At present, the quality and the precision of homemade thin-walled cover all do not reach requirement, so be main with imported product mainly, cause new product to cost an arm and a leg, and maintenance cost improves.This thin-walled is enclosed within the use because the effect of chemical gas and the influence of environment for use, and the product part has wearing and tearing or the deflation of vaporizing, and need repair with built-up welding.Existing arc surfacing thinning ratio is high, and the heat affected zone is repaired precision concerning this wall the thin and demanding thin-walled cover of quality of fit greatly and is difficult to reach requirement.
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., be the problem that those skilled in the art need solve how with of the reparation of laser melting and coating technique effective application in the thin-walled cover.
Summary of the invention
The technical problem that the present invention will solve provides a kind ofly carries out laser melting coating to thin-walled cover surface; Make its size restoration to request for utilization; And the deflection of repairing the back product is minimum, and hardness and erosion resistance surpass the laser cladding repair technique of the thin-walled cover of original performance.
In order to solve the problems of the technologies described above, the invention provides a kind of laser repairing process of thin-walled cover, may further comprise the steps:
A. thin-walled cover surface is handled, the thin-walled cover is carried out failure analysis;
B. use frock that the endoporus of thin-walled cover is fixed,, make it keep stressed even through the circular degree of frock adjustment thin-walled cover;
C. according to the failure analysis result of thin-walled cover, optimize processing parameter, carry out laser melting coating, during laser melting coating, other positions beyond the position to be repaired are cooled off;
The component of the powdered alloy that is adopted and weight percent content are C≤0.03%, Cr:18% to 22%, and Si:0.5% to 1.2%, Ni:10% to 15%, Mo:2.0% to 3.0%, Mn:1.0% to 2.0%, W:1.0% to 2.0%, all the other are Fe;
D. detect;
E. under frock fixed situation, the thin-walled cover is assembled on the equipment, removes frock in the time of assembling.
In order to guarantee the performance of cladding layer; Better eliminate built-up welding stress; Make that thin-walled cover deflection is littler, a kind of optimized technical scheme is: adopting among the above-mentioned steps C and preset the mode of powder feeding, is that light source carries out the scanning of continuous helical feeding overlap joint to the thin-walled cover with the fast-transverse-flow CO; Laser power is 1500W to 1900W, and absolute altitude is 260mm to 275mm, and spot size is 10mm * 1.8mm, and sweep velocity is 110mm/min to 130mm/min, and amount of lap is 6.5mm, and powder sending quantity is 12g/min to 18g/min.The laser repairing process of this thin-walled cover 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 cladding layer and thin-walled overlap the fusion rate height of the matrix of failure site, combine closely, and thin-walled cover surface does not have crackle and pore, and thin-walled cover deflection is little.
Repair successfully in order to make thin-walled to be repaired be enclosed within the process of laser melting coating, and obtain better repairing effect, a kind of optimized technical scheme is: above-mentioned steps A removes dust, greasy dirt, corrosion that thin-walled puts; Detect the size at each position of thin-walled cover, confirm failure site and abrasion loss thereof, confirm thin-walled cover deflection; Remove the fatigue layer 0.2mm to 2mm of thin-walled cover failure site, and clean.
For the quality of the cover of the thin-walled after guaranteeing to repair, a kind of optimized technical scheme is: above-mentioned steps D detects thin-walled cover deflection; Under frock fixed situation, mechanical workout is carried out on thin-walled cover surface; Detect a flaw, verification.
Technique scheme of the present invention is compared prior art and is had the following advantages:
(1) laser repairing process of thin-walled cover of the present invention uses the frock that can adjust that the endoporus of thin-walled cover is fixed in laser melting coating, mechanical workout, transportation placement, assembling process always; Keep the circumference of thin-walled cover stressed evenly; When the thin-walled cover is assembled on the equipment, shift out frock while just assemble, assemble and tear open frock and carry out simultaneously; Can the deflection of thin-walled cover be controlled at 0.3mm effectively, meet request for utilization.Adopt additive method to carry out the thin-walled cover and repair, deflection is estimated more than 20mm, can directly cause it to scrap.
(2) laser repairing process of thin-walled cover of the present invention ceaselessly cools off other positions beyond the position to be repaired when laser melting coating, stops the diffusion of built-up welding heat, helps reducing built-up welding stress, alleviates the distortion of thin-walled cover.
(3) adopt homemade powdered alloy in the laser repairing process of thin-walled of the present invention cover, through the content of strict control C, make it be not more than 0.03% in the composition of powdered alloy, make powder have good wettability, in cladding process, crack preventing; Make alloy form austenite solidifying the back through adding an amount of Si, satisfying its hardness requirement, and make powdered alloy have good self-fluxing nature; Utilize proper C r, Ni, Mo, Mn, W element not to influence under the prerequisite of powdered alloy weldableness and wettability in assurance; Effectively ferrous alloy has been carried out the element reinforcement; The hardness that makes thin-walled overlap the surface increases and is more corrosion-resistant, makes that simultaneously the extension of cladding layer is functional.
Embodiment
The concrete steps of the laser repairing process of the thin-walled cover of present embodiment are following:
A. thin-walled cover surface to be repaired is handled, the thin-walled cover is carried out failure analysis.
Removings such as the dust that thin-walled is put, greasy dirt, corrosion; Detect the size at each position of thin-walled cover, confirm failure site and abrasion loss thereof, whether check thin-walled cover has metamorphism; Remove the fatigue layer 0.5mm of thin-walled cover failure site through polishing, and clean.
B. use frock that the endoporus of thin-walled cover is fixed,, make it keep circumference stressed evenly through the circular degree of frock adjustment thin-walled cover.
C. according to the failure analysis result of thin-walled cover, optimize processing parameter, carry out laser melting coating.During laser melting coating, other position waters beyond the position to be repaired are cooled off.
The mode of powder feeding is preset in employing, is that light source carries out the scanning of continuous helical feeding overlap joint to the position to be repaired of thin-walled cover with the fast-transverse-flow CO.Laser power is 1700W, and absolute altitude (being that laser apparatus leaves the distance between the Substrate, absolute altitude=focal length+defocusing amount) is 270mm, and spot size is 10mm * 1.8mm, and sweep velocity is 120 mm/min, and amount of lap is 6.5mm, and powder sending quantity is 15g/min.The component of the powdered alloy that is adopted and weight percent content are C:0.03%, Cr:20%, and Si:0.8%, Ni:12%, Mo:2.5%, Mn:1.5%, W:1.5%, all the other are Fe.
D. after repairing end, detect.
Detect deflection; Under frock fixed situation, mechanical workout is carried out on thin-walled cover surface; Detect a flaw, detect the defective that whether has pore, slag inclusion, slight crack etc. to influence thin-walled cover mechanical property; Carry out verification, whether quality inspection is qualified.
E. under frock fixed situation, the thin-walled cover is assembled on the equipment, removes frock while assemble.
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, can also make other multi-form variation or change on the basis of the above description.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 (4)

1. the laser repairing process of a thin-walled cover is characterized in that, may further comprise the steps:
A. thin-walled cover surface is handled, the thin-walled cover is carried out failure analysis;
B. use frock that the endoporus of thin-walled cover is fixed,, make it keep stressed even through the circular degree of frock adjustment thin-walled cover;
C. according to the failure analysis result of thin-walled cover, optimize processing parameter, carry out laser melting coating, during laser melting coating, other positions beyond the position to be repaired are cooled off;
The component of the powdered alloy that is adopted and weight percent content are C≤0.03%, Cr:18% to 22%, and Si:0.5% to 1.2%, Ni:10% to 15%, Mo:2.0% to 3.0%, Mn:1.0% to 2.0%, W:1.0% to 2.0%, all the other are Fe;
D. detect;
E. under frock fixed situation, the thin-walled cover is assembled on the equipment, removes frock in the time of assembling.
2. according to the laser repairing process of the described thin-walled cover of claim 1, it is characterized in that: adopting among the said step C and preset the mode of powder feeding, is that light source carries out the scanning of continuous helical feeding overlap joint to the thin-walled cover with the fast-transverse-flow CO; Laser power is 1500W to 1900W, and absolute altitude is 260mm to 275mm, and spot size is 10mm * 1.8mm, and sweep velocity is 110mm/min to 130mm/min, and amount of lap is 6.5mm, and powder sending quantity is 12g/min to 18g/min.
3. according to the laser repairing process of the described thin-walled cover of claim 2, it is characterized in that: said steps A is that dust, greasy dirt, corrosion that thin-walled puts are removed; Detect the size at each position of thin-walled cover, confirm failure site and abrasion loss thereof, confirm thin-walled cover deflection; Remove the fatigue layer 0.2mm to 2mm of thin-walled cover failure site, and clean.
4. according to the laser repairing process of the described thin-walled cover of claim 2, it is characterized in that: said step D detects thin-walled cover deflection; Under frock fixed situation, mechanical workout is carried out on thin-walled cover surface; Detect a flaw, verification.
CN201210351277XA 2012-09-20 2012-09-20 Laser cladding repair process for thin-wall sleeves Pending CN102828180A (en)

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CN201310239642.2A CN103668175B (en) 2012-09-20 2012-09-20 Be beneficial to the laser cladding repair technique of the thin-wall sleeve reducing built-up welding static stress and distortion

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN103753020A (en) * 2014-01-17 2014-04-30 河南科技大学 Laser repair welding process for Zn-Al alloy
CN105349994A (en) * 2015-12-11 2016-02-24 苏州大学 Laser cladding process for part cavity surface repair
CN105349993A (en) * 2015-11-15 2016-02-24 山东能源重装集团大族再制造有限公司 Cladding method for inner hole of stand column
CN105517750A (en) * 2013-09-10 2016-04-20 卡特彼勒公司 Machine component cladding strategy
CN107740002A (en) * 2017-06-13 2018-02-27 刘红宾 A kind of novel control nitrogen austenitic stainless steel and preparation method thereof
CN108754489A (en) * 2018-05-25 2018-11-06 金华华科激光科技有限公司 A kind of method of iron based laser cladding powder and the laser melting coating powder
CN109778183A (en) * 2019-03-13 2019-05-21 沈阳大陆激光工程技术有限公司 A kind of functional layer alloy material and its manufacturing method laser manufacture and remanufacture continuous casting line foot roller
CN111570978A (en) * 2020-04-01 2020-08-25 中车青岛四方机车车辆股份有限公司 Threaded hole thin-wall repair welding method
CN111633374A (en) * 2020-06-01 2020-09-08 湖北三江航天江北机械工程有限公司 Method for repairing damage inside attitude control engine combustion chamber shell

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JP4368245B2 (en) * 2004-05-17 2009-11-18 株式会社リケン Hard particle dispersion type iron-based sintered alloy
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CN102677049A (en) * 2012-05-27 2012-09-19 丹阳市宏图机械制造有限公司 Laser restoring process for surface of high carbon alloy roller

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CN101358344A (en) * 2008-09-01 2009-02-04 南京钢铁股份有限公司 Repair method of backup roll surface of steckel mill and special repair powder used thereon
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

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105517750A (en) * 2013-09-10 2016-04-20 卡特彼勒公司 Machine component cladding strategy
US9555503B2 (en) 2013-09-10 2017-01-31 Caterpillar Inc. Machine component cladding strategy
CN103753020A (en) * 2014-01-17 2014-04-30 河南科技大学 Laser repair welding process for Zn-Al alloy
CN105349993A (en) * 2015-11-15 2016-02-24 山东能源重装集团大族再制造有限公司 Cladding method for inner hole of stand column
CN105349993B (en) * 2015-11-15 2018-04-13 山东能源重型装备制造集团有限责任公司 A kind of cladding method of column endoporus
CN105349994A (en) * 2015-12-11 2016-02-24 苏州大学 Laser cladding process for part cavity surface repair
CN107740002A (en) * 2017-06-13 2018-02-27 刘红宾 A kind of novel control nitrogen austenitic stainless steel and preparation method thereof
CN108754489A (en) * 2018-05-25 2018-11-06 金华华科激光科技有限公司 A kind of method of iron based laser cladding powder and the laser melting coating powder
CN109778183A (en) * 2019-03-13 2019-05-21 沈阳大陆激光工程技术有限公司 A kind of functional layer alloy material and its manufacturing method laser manufacture and remanufacture continuous casting line foot roller
CN111570978A (en) * 2020-04-01 2020-08-25 中车青岛四方机车车辆股份有限公司 Threaded hole thin-wall repair welding method
CN111570978B (en) * 2020-04-01 2021-10-01 中车青岛四方机车车辆股份有限公司 Threaded hole thin-wall repair welding method
CN111633374A (en) * 2020-06-01 2020-09-08 湖北三江航天江北机械工程有限公司 Method for repairing damage inside attitude control engine combustion chamber shell

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