CN101148763A - Construction method for weldable wear-proof thick coating - Google Patents
Construction method for weldable wear-proof thick coating Download PDFInfo
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- CN101148763A CN101148763A CNA2007100503640A CN200710050364A CN101148763A CN 101148763 A CN101148763 A CN 101148763A CN A2007100503640 A CNA2007100503640 A CN A2007100503640A CN 200710050364 A CN200710050364 A CN 200710050364A CN 101148763 A CN101148763 A CN 101148763A
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- thick coating
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Abstract
The construction process of forming thick antiwear coating includes the following steps: sand blasting the base material and arc spraying to form an antiwear weldable coating of 0.5 mm thickness; spot welding with heat resistant stainless weld rod to form 2.0-3.5 mm height weld spots in 50-60 mm interval on the surface and reaching to the base material; roughening the weld spots and arc spraying to form an antiwear coating of 2-3.5 mm thickness; polishing the weld spots to the same plane as the coating; and final hole sealing treatment of the coating. The thick antiwear coating has great thickness and high bonding strength, and is especially suitable for boiler pipes.
Description
Technological method
The present invention relates to the coating application technology, is to handle to improve the coating operating technique of anchoring strength of coating and increase coat-thickness by spot welding and surface irregularity specifically.
Background technology
For a long time, in electric arc spraying abrasionproof field, all there is not the breakthrough of what essence, because coating and matrix are to belong to mechanical bond, coat-thickness is subjected to the restriction of bonding strength, and because the factor of physics, chemistry and the mechanical property of coating, coat-thickness generally all is no more than 1 millimeter, even take compound coating, can not surpass the forbidden zone more than 2 millimeters.But along with promoting the use of of high-parameters, large vol circular fluid bed, the boiler tube degree of wear is more and more serious, and the thin abrasionproof coating that conventional electric arc spraying obtains far can not satisfy the needs of boiler wear resistant, mainly contains following defectives:
1, owing to contain the random motion of layer flue gas, the degree of wear that causes is inconsistent, and the position coating that has very quick-wearing lost efficacy, and the position that has wearing and tearing are lighter.
2, because degradation degree is different, discontinuity equalization, it is serious that the piece phenomenon is fallen in the coating part.
3, along with falling the generation that piece comes off, some boss can occur, more aggravate wearing and tearing.
4, because the thermal expansivity of coating and matrix is not exclusively the same, and under the effect of alternating thermal stress, coating easily comes off, will influence the normal operation of equipment when serious.
Summary of the invention
The objective of the invention is to provide a kind of constructional method of weldable wear-proof thick coating, to improve anchoring strength of coating and to increase coat-thickness at prior art problems and weak point.
The object of the present invention is achieved like this: a kind of constructional method of weldable wear-proof thick coating is characterized in that: carry out according to the following steps: a), base material is carried out sandblasting, and at the wear-resisting weldable coating layer of substrate surface electric arc spraying 0.5mm; B), substrate surface at interval 50～60mm highly be the solder joint of 2.0～3.5mm with the spot welding of heat-resistance stainless steel welding rod, solder joint wants through welding to base material; C), butt welding point carries out coarse processing, the thick wear-resistant coating of electric arc spraying 2～3.5mm again; D), solder joint polishing is level and smooth, with coating on same plane; E), at last coating being carried out sealing of hole handles.
Adopt the present invention can weld thick coating abrasionproof technology and can be applicable to the serious wear position, the more former common spraying technology of this technology has following effect:
1, the thick coating that available can be good, coat-thickness can reach 2～4 millimeters.
2, anchoring strength of coating height is not prone to piece and comes off, and does not cause concentrated wear.
3, can significantly prolong the coating abrasionproof cycle, can be increased to 2～3 years by the 1 original year.
4, can bear suitable alternating thermal stress, do not come off, indeformable, do not crack.
5, prolong equipment overhaul cycle, reduce the cost of overhaul and the loss that stops production.
" trial report " seen in the coating performance test:
| Ask examination unit | Technical division | Test subject | But boiler water wall build-up wear-resistant coating experiment | ||||||||||
| Title material | The heat-resisting seamless steel tube for boiler of 20G | Specifications and models | ￠ 60 | ||||||||||
| The sampling place | Jiajiang company | Sample size | 7 | ||||||||||
| Sample presentation unit | Engineering department | Sampling times/sample presentation a few days ago | 2007.9.18 | ||||||||||
| Kind of test | Strength of coating, wear-resisting, heat-shock resistance contrast experiment | Date of test | 2007.9.18/2007.9.21 | ||||||||||
| Detection site | Jiajiang company | ||||||||||||
| Test requirements document and method; 1, is made into the boiler water wall laboratory sample (3 pipes, 100mm height, 3 pipes, 200mm height) of standard; 2, on laboratory sample, carry out manual spot welding and spraying of wearable coating; 3, laboratory sample and experiment classification are for details see attached table; 4, experimental result need form written literal and by related personnel's approval of signing.5, experiment purpose is contrast solder joint and abrasion property energy difference and bonding strength and thermal shock resistance. | |||||||||||||
| The main technical details of test: (test unit fills in) | |||||||||||||
| Spray voltage | Spraying current | Compressed air pressure | Solder joint height | Spot spacing | Coating thickness for the first time | Coating thickness for the second time | The thermal shock resistance experiment number | The thermal shock resistance experimental temperature | The thermotolerance experimental temperature | ||||
| 34V | 180A | 0.7mpa | 0.2mm | 60mm | 0.5mm | 1.5mm | 20 | 500 | 800,900 | ||||
| Test environment | Temperature: 22 ℃, relative humidity: 55% | ||||||||||||
| The test owner | Li Xu | Report establishment people | Li Xu | ||||||||||
| The tester | Li Xu, Li Jun (technical division), Hu Shengjin, Zuo Doutai, Xiao Kunhua, tight brave, Liu Wankai, Guo Chaoping | ||||||||||||
| Test duration | 2007.9.18～2007.9.21 |
The test item situation
| Sequence number | Test event | Operative norm | Prescribed value | Detected result | Conclusion | |
| 1 | Thermal shock resistance | Be heated to 500 ℃ of constant temperature 10 minutes | Nothing comes off, slight crack | Nothing comes off, slight crack | The complication experiment requirement | |
| 2 | High temperature resistant | 1, be heated to 800 ℃ of constant temperature 5 minutes 2, be heated to 900 ℃ of constant temperature 5 minutes | Do not have come off, slight crack, distortion | Nothing comes off, produces slight crackle, and 900 ℃ have moire, no change behind the chilling; | Substantially meet requirement of experiment | |
| 3 | Bonding strength | On coating, draw the well word with special broaching tool | No sheet bits shape comes off | No sheet bits shape comes off | Meet requirement of experiment | |
| 4 | Wear-resistant | Spend angle spary coating and solder joints with quartz sand by 30 degree～45 | Survey attenuate amount (thickness measuring method) in the unit time | Destroyed old coating, and saw matrix in 7 minutes; Coat-thickness 2mm, solder joint height 2mm | ||
| Conclusion (of pressure testing) | Through experiment test: 1, thermal shock resistance experiment: through 500 ℃ of constant temperature and 20 experiments of chilling, the range estimation coating do not have come off, crackle; The experiment of 2 thermotolerances: 1) 800 ℃ of constant temperature produced slight crackle in 5 minutes, did not have considerable change behind the chilling; 900 ℃ of constant temperature had slight moire in 5 minutes, did not have considerable change behind the chilling; 3, solder joint compares with abrasion property: wear rate is consistent; 4, adopt the anchoring strength of coating of solder joint apparently higher than common spraying; 5, adopt the coating heat-shock resistance of solder joint apparently higher than common spraying. | |||||
In a word, electric arc spraying thick coating abrasionproof of the present invention under the situation that does not influence the matrix metal metallographic structure, adopts spraying and spot welding way of combining.Both increase the abrasionproof coat-thickness, guaranteed anchoring strength of coating again, and can significantly improve coating abrasion performance, and especially on the abrasionproof of the comparatively serious station boiler of wearing and tearing " four pipes ", more can embody the economy of this technology, reduced power plant's cost of electricity-generating.
Specific implementation method
The constructional method of weldable wear-proof thick coating, carry out according to the following steps: a), base material is carried out sandblasting, and at the wear-resisting weldable coating layer of substrate surface electric arc spraying 0.5mm; B), substrate surface at interval 50～60mm highly be the solder joint of 2.0～3.5mm with the spot welding of heat-resistance stainless steel welding rod, solder joint wants through welding to base material; D), butt welding point carries out coarse processing, the thick wear-resistant coating of electric arc spraying 2～3.5mm again; C), solder joint polishing is level and smooth, with coating on same plane; E), at last coating being carried out sealing of hole handles.Desirable any value between spot spacing 50～60mm, solder joint height 2mm (optimum value) in fact also can 2～3.5mm.
Above-mentioned a), c) wear-resistant coating in the step is existing coating such as SE-SAM coating.
Welded spot pitch is 60mm, and perhaps welded spot pitch is 50mm.Base material is a generator tube.Furnace tube material is 20G, and stainless steel electrode is 402A.A), c) in the step, the spray voltage of electric arc spraying is 34V, spraying current is 180A.Compressed air pressure is 0.7mpa (gauge pressure).
The present invention generally is applicable to the construction of the arc spraying coating of metallic substance under the worst hot case, is specially adapted to the construction of the corrosion protection coating of electric arc generator tube.
Claims (5)
1. the constructional method of a weldable wear-proof thick coating is characterized in that: carry out according to the following steps:
A), base material is carried out sandblasting, and at the wear-resisting weldable coating layer of substrate surface electric arc spraying 0.5mm;
B), substrate surface at interval 50～60mm highly be the solder joint of 2.0～3.5mm with the spot welding of heat-resistance stainless steel welding rod, solder joint wants through welding to base material;
C), butt welding point carries out coarse processing, the thick wear-resistant coating of electric arc spraying 2～3.5mm again;
D), solder joint polishing is level and smooth, with coating on same plane;
E), at last coating being carried out sealing of hole handles.
2. according to the constructional method of the described weldable wear-proof thick coating of claim 1, it is characterized in that: described b) in the step, welded spot pitch is 50mm.
3. according to the constructional method of the described weldable wear-proof thick coating of claim 1, it is characterized in that: described b) in the step, welded spot pitch is 60mm.
4. according to the constructional method of the described weldable wear-proof thick coating of power 1 to 3 arbitrary claim, it is characterized in that: described base material is a generator tube.
5. according to the constructional method of power 1 to 3 arbitrary claim described weldable wear-proof thick coating, it is characterized in that: described a), c) in the step, the spray voltage of electric arc spraying is 34V, spraying current is 180A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100503640A CN101148763A (en) | 2007-10-31 | 2007-10-31 | Construction method for weldable wear-proof thick coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100503640A CN101148763A (en) | 2007-10-31 | 2007-10-31 | Construction method for weldable wear-proof thick coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101148763A true CN101148763A (en) | 2008-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100503640A Pending CN101148763A (en) | 2007-10-31 | 2007-10-31 | Construction method for weldable wear-proof thick coating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551197B (en) * | 2009-05-14 | 2012-04-18 | 瓮福（集团）有限责任公司 | A pyrite-based sulphuric acid roaster cooling calandria repairing method |
| CN103231148A (en) * | 2013-05-03 | 2013-08-07 | 胜利油田金岛工程安装有限责任公司 | Corrosion-preventing processing method for pipe end of inner lining glass corrosion-preventing steel pipe |
-
2007
- 2007-10-31 CN CNA2007100503640A patent/CN101148763A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551197B (en) * | 2009-05-14 | 2012-04-18 | 瓮福（集团）有限责任公司 | A pyrite-based sulphuric acid roaster cooling calandria repairing method |
| CN103231148A (en) * | 2013-05-03 | 2013-08-07 | 胜利油田金岛工程安装有限责任公司 | Corrosion-preventing processing method for pipe end of inner lining glass corrosion-preventing steel pipe |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Huang Zhaoling Document name: Patent fee refund notice Addressee: Huang Zhaoling Document name: Notice of publication of application for patent for invention |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080326 |