CN100443232C - Method for restoring slurry pump casing used for river and sea dredger - Google Patents
Method for restoring slurry pump casing used for river and sea dredger Download PDFInfo
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- CN100443232C CN100443232C CNB2007100358327A CN200710035832A CN100443232C CN 100443232 C CN100443232 C CN 100443232C CN B2007100358327 A CNB2007100358327 A CN B2007100358327A CN 200710035832 A CN200710035832 A CN 200710035832A CN 100443232 C CN100443232 C CN 100443232C
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Abstract
The present invention discloses a repair method for the internal pump shell the imported dredger high chromium cast iron mud pump and the internal pump shell the domestic dredger high chromium cast iron mud pump; the rust and burr on the fretted surface of the internal pump shell of the mud pump is removed and angles are ground on a plurality of parts according to requirements. With the short-arc welding of multi-pass welding and skip welding processes, a priming coat of reticular arrangement is welded on the clean internal pump fretted surface of the mud pump; at the same time, the welding seams are beat to remove the stress and avoid crack formation and control the interpass temperature on the priming coat surface. With the short-arc welding of the multi-pass welding and skip welding processes adopted by UTP abrasion welding rod and DC welder, a first abrasion layer, a second abrasion layer, an isolating layer, a third abrasion layer and a fourth abrasion layer are welded on the priming coat and the interpass temperature of every layer is controlled. The repaired internal pump shell of dredge mud pump will not be deformed and the matrix will not be damaged; the welded layers are abrasion and impact resistant; the cost can be saved by 70 to 90 percent; the service life can be prolonged by 3 to 5 times. Therefore, the present invention has great dissemination value.
Description
Technical field
The present invention relates to a kind of restorative procedure, relating in particular to a kind of being applied to the rich chromium cast iron is the restorative procedure of pump case in the slush pump of used for river and sea dredger of material.
Background technology
Countless dredgers is arranged in China's rivers and ocean, all slush pump is installed on every dredger so that the mud in the rivers and the ocean and sand dragged for make construction material and build harbour, fill out sea and dredging river, the silt particle of Jiang Haizhong dig out when carrying can collide or hit through slush pump or the slush pump that rubs in pump case.After after a while, pump case in the slush pump is because local area even can worn outly cause the interior pump case of slush pump to scrap is beaten or friction can be bumped polishing and clashed the countless degree of depth groove different with width in bumping of silt particle.Because special environment for use and condition, pump case all adopts the wear-resisting rich chromium cast iron manufacturing of utmost point energy usually in the slush pump, at present also not about solving domestic and comprising the report with a pump case wearing and tearing reparation difficult problem in the slush pump of rich chromium cast iron manufacturing such as Holland, Japan and the U.S..Before the present invention, be used in pump case in the slush pump on the river and sea dredger in case wearing and tearing are promptly scrapped it, pump case in the new slush pump of external introduction had both caused the waste of equipment again, had increased production cost again.
Summary of the invention
The object of the present invention is to provide and a kind ofly can prolong, reduce production costs and be based on the restorative procedure of being used on the river and sea dredger of domestic innovation with pump case in the slush pump with pump case service life in the slush pump of rich chromium cast iron manufacturing.
For achieving the above object, the technical solution used in the present invention is: light is pulled down the slurry pump casing that is worn and is cleaned, again with corrosion, the deburred and worn on pump case surface in the slush pump, to the arm of angle rib angle polishing on request on pump case surface in the slush pump.
Surface to pump case in the slush pump of having cleared up feels secure, during bottoming earlier in rough slush pump is arranged the inner surface of pump case matrix use homemade 68-3 welding rod and the UTP83FN Special Casting Iron welding rod bought from Germany with the prime coat of the netted shape layout of employed short arc welding built-up welding one deck the shunting welder skill, the fusion length of per pass short arc welding is 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill.When the built-up welding prime coat, knock, remove welding slag on the one hand, eliminate stress on the other hand, make prime coat firm with the pane hammer butt welded seam.When large tracts of land was used short arc welding in the shunting welder skill, the clear area was constantly filled up, and at this moment temperature adopts jump welder skill this moment in continuous rising, and the large tracts of land weld seam temperature is remained on about 150 ℃.
After bottoming technology finishes, carry out hardfacing.
Adjacent prime coat adopts employed short arc welding built-up welding first wearing layer during employed short arc welding and jump welder are planted in the shunting welder skill with UTPLEDURIT61 wear resistance electrode and dc welding machine on the prime coat surface.The fusion length of short arc welding is 30-60mm, the 40-70mm of being separated by between the weld seam of every adjacent two short arc weldings and weld seam are vertical; When built-up welding first wearing layer, the interlayer temperature on control prime coat surface is 100-200 ℃, and forbids to knock the layer surface.
On the first wearing layer surface, use short arc welding built-up welding second wearing layer of shunting welder skill and jump welder skill with UTPLEDURIT65 wear resistance electrode and dc welding machine, the fusion length of short arc welding is 30-60mm, the 40-70mm of being separated by between the weld seam of every adjacent two short arc weldings and weld seam are vertical; The interlayer temperature of controlling on second wearing layer is 100-200 ℃, does not knock the layer surface.Built-up welding that second wearing layer can be done disposable (being one deck) also can be done secondary (i.e. two layers of property) built-up welding.
If because of the second wearing layer insufficient height, can adopt extraordinary uranami welding electrode of UTP63 full austenite and dc welding machine on second wearing layer, to use short arc welding in the shunting welder skill and the short arc welding built-up welding separation layer in the jump welder skill, and the interlayer temperature of controlling on the separation layer is 100-200 ℃.
On separation layer, use anti-welding rod built-up welding the 3rd wearing layer of UTPLEDURIT61 wear resistance electrode and UTPLEDURIT65 and the 4th wearing layer respectively, the built-up welding mode still is the short arc welding in short arc welding in the shunting welder skill and the jump welder skill, controlling each interlayer temperature is 100-200 ℃, till the slurry pump casing inner surface is smooth.
The restorative procedure that adopts a kind of slurry pump casing used for river and sea dredger that as above technical scheme provides compared with prior art, technique effect is:
1. short arc welding is applied in shunting welder skill and the jump welder skill, can guarantees that each interlayer temperature in low scope, do not hinder matrix, do not produce deformation.
2. with dc welding machine and employing UTP welding material (welding rod), overlay cladding is wear-resisting, shock-resistant, pump case in the slush pump after repairing can be substituted import equipment fully.
3. need ten thousand yuan of coin 60-80 from slurry pump casing of external buying, can only dig 250 ten thousand stere mud, and adopt hardfacing technology of the present invention only to need the interior pump pump case of about 100,000 yuan mud of repairing of coin still can dig 250 ten thousand stere mud, save equipment cost 70-90%; Remove this and also can save many freights.
4. pump case can be repaired 3-5 time in slush pump, equals to improve 3-5 times of service life of mud shell.
5. this restorative procedure is specially adapted to the reparation with pump case in the slush pump of rich chromium cast iron manufacturing from external introduction, has solved the maintenance difficult problem of import equipment.
6. this technology can be carried out the part and repaired flexibly and strengthen, and particularly for the repairing of the position of importing and exporting, be not subjected to the inner complex surfaces structure of pump case and influence, and the thickness of wearing layer can arbitrarily be adjusted.Since be that built-up welding is got on, the risk that does not have integral body to come off.
Description of drawings
Fig. 1 is a pump case partial schematic sectional view in the mud shown in the restorative procedure of a kind of slurry pump casing used for river and sea dredger of the present invention, also is Figure of abstract of the present invention.
Fig. 2 is for reaching the form schematic diagram of employed short arc welding in the jump welder skill in the shunting welder skill.
The specific embodiment
Below in conjunction with accompanying drawing is that the specific embodiment of the present invention describes in further detail.
The restorative procedure of a kind of slurry pump casing used for river and sea dredger of the present invention is divided into: technique for grinding, bottoming technology and wearing layer bead-welding technology.
1. technique for grinding: its corrosion and burr are removed with abrasive blast equipment in the internal layer surface of pump case matrix 1 in the slush pump that cleans up, the rough groove arris in matrix 1 internal layer surface is pressed 20-30 ° of angle polishing, polishing can be adopted instruments such as hand grinding tool, remove the residual thing and the powder of polishing with compressed air, guarantee that internal layer is clean.
2. technology feels secure: as shown in Figure 1, the UTP83FN Special Casting Iron welding rod of buying with dc welding machine and homemade 68-3 welding rod with from Germany on the internal layer surface of pump case matrix 1 in clean slush pump is earlier with the prime coat 2 of the netted shape layout of employed short arc welding built-up welding one deck the shunting welder skill, prime coat 2 both can reduce production costs for netted shape layout, can make prime coat 2 more firm again.The fusion length of each short arc welding is 30-60mm during built-up welding, wants butt welded seam to knock when built-up welding prime coat 2, has both cleared up welding slag, eliminates weld stress again, avoids crackle, makes bottoming firmly.The 40-70mm of being separated by between vertical with the weld seam of every adjacent two short arc weldings in the shunting welder of the UTP83FN Special Casting Iron welding rod skill and weld seam, control prime coat 2 lip-deep interlayer temperatures are 100-200 ℃ when built-up welding prime coat 2, just can descend the built-up welding of one deck wearing layer.Wherein UTP83FN Special Casting Iron welding rod can be selected the product of φ 3.2mm for use.
Employed short arc welding can not be controlled under the situation of prime coat 2 quality (as the local temperature rising etc.) in shunting welder skill, need to adopt jump welder skill, promptly with UTP83FN Special Casting Iron welding rod on matrix 1 internal layer surface not the no-mobile reactor welding position be equipped with the jump short arc welding of welder skill of selectivity, as shown in Figure 2, can jump to the second built-up welding district b or the 3rd built-up welding district c or the 4th built-up welding district d...... from the first built-up welding district a, or it is opposite, can remedy deficiency like this as employed short arc welding in first built-up welding district a shunting welder skill, make the thickness of whole prime coat 2 even, firm with matrix 1 inner welded again, under go on foot operation and get ready.
3. hardfacing technology: after bottoming technology finishes, carry out hardfacing technology.
Employed short arc welding built-up welding was at the first built-up welding district a built-up welding, first wearing layer 3 during adjacent prime coat 2 usefulness dc welding machines and UTPLEDURIT61 wear resistance electrode were planted with the shunting welder earlier on the surface of prime coat 2, forbid to beat the hardfacing laminar surface, controlling the first wear-resisting 3 lip-deep interlayer temperature is 100-200 ℃, if after testing or feel, temperature is too high, stop at the built-up welding work of the first built-up welding district a, employed short arc welding jumps to the second built-up welding district b or the 3rd built-up welding district c or the 4th built-up welding district d...... from the first built-up welding district a in the employing jump welder skill, or it is opposite, the repeated multiple times built-up welding is till first wearing layer 3 is even everywhere.The fusion length of short arc welding is 30-60mm, the shunting welder weld seam of each the every adjacent two short arc welding 40-70mm of being separated by between vertical with weld seam that plants.Wherein can to select diameter for use be the product of φ 4.0mm to the UTPLEDURIT61 wear resistance electrode.
With UTPLEDURIT65 wear resistance electrode and dc welding machine on the surface of first wearing layer 3 earlier with employed short arc welding in the shunting welder skill at the first built-up welding district a built-up welding, second wearing layer 4, but 4 built-up welding of second wearing layer are two-layer, when built-up welding, mustn't knock the hardfacing laminar surface, second wearing layer, 4 lip-deep interlayer temperatures are strict controlled in 100-200 ℃ of scope, just can descend the built-up welding of road wearing layer, if after testing or feel, temperature is too high, stop to pile up the built-up welding work of the first built-up welding district a, employed short arc welding jumps to the second built-up welding district b or the 3rd built-up welding district c or the 4th built-up welding district d...... from the first built-up welding district a in the employing jump welder skill, or it is opposite, the repeated multiple times built-up welding is till second wearing layer 4 is even everywhere.The fusion length of short arc welding is 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill.Wherein can to select diameter for use be the product of φ 4.0mm to the UTPLEDURIT65 welding rod.
At the whole height of first wearing layer 3 and second wearing layer 4 not enough the time or the pit after bottoming when also not filling up, extraordinary uranami welding electrode of the full formula body difficult to understand of available UTP63 and dc welding machine, employed short arc welding is at the lip-deep first built-up welding district a built-up welding separation layer 5 of second wearing layer 4 in planting with the shunting welder earlier, the short arc welding weld seam is long to be 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill.Do not knock the layer surface of separation layer 5, control separation layer 5 lip-deep interlayer temperatures are in 100-200 ℃, if after testing or feel, temperature is too high, stop to pile up the built-up welding work of the first built-up welding district a, employed short arc welding jumps to the second built-up welding district b or the 3rd built-up welding district c or the 4th built-up welding district d...... from the first built-up welding district a in the employing jump welder skill, or opposite, till separation layer 5 is even everywhere.
On the first built-up welding district a on the surface of separation layer 5 with dc welding machine and UTPLEDURIT61 wear resistance electrode, earlier with employed short arc welding built-up welding the 3rd wearing layer 6 in the shunting welder skill, do not knock the layer surface of the 3rd wearing layer 6, controlling the 3rd wearing layer 6 lip-deep interlayer temperatures is 100-200 ℃, just can descend the built-up welding of road wearing layer.If after testing or feel, temperature is too high, stop to pile up the built-up welding work of the first built-up welding district a, employed short arc welding jumps to the second built-up welding district b or the 3rd built-up welding district c or the 4th built-up welding district d...... from the first built-up welding district a in the employing jump welder skill, or opposite, till the 3rd wearing layer 6 is even everywhere.The short arc welding fusion length is 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill.
On the first built-up welding district a on the surface of the 3rd floor wear-resisting 6 with dc welding machine and UTPLEDURIT65 wear resistance electrode, earlier with employed short arc welding built-up welding the 4th wearing layer 7 in the shunting welder skill, do not knock the layer surface of the 4th wearing layer 7, use infrared radiation thermometer, the skin temperature of controlling the 4th wearing layer 7 is 100-200 ℃.If after testing or feel, temperature is too high, stop to pile up the built-up welding work of the first built-up welding district a, employed short arc welding jumps to the second built-up welding district b or the 3rd built-up welding district c or the 4th built-up welding district d...... from the first built-up welding district a in the employing jump welder skill, or opposite, till the 4th wearing layer 7 is even everywhere.The fusion length of short arc welding is 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill.
Described shunting welder skill is the bead-welding technology that a plurality of discontinuous short arc welding constituted of in a certain zone (as built-up welding district a or b or c or d); Jump welder skill jumps to another zone for a certain zone (as built-up welding district a or b or c or d) a plurality of discontinuous short arc weldings of section internal cause sometime cause temperature in this zone to raise interior (as built-up welding district b or c or d or a) proceed the bead-welding technology of a plurality of discontinuous short arc weldings, make each zone always be in the temperature range of being controlled, jump welder skill comprises shunting welder skill.
Pump case comes into operation in the slush pump after hardfacing repeatedly, reaches purpose of the present invention.
Claims (1)
1, a kind of restorative procedure of slurry pump casing used for river and sea dredger, it is characterized in that: corrosion and burr are removed with abrasive blast equipment in the internal layer surface of pump case matrix (1) in the slush pump that cleans up, the rough groove arris in internal layer surface to matrix (1) is pressed 20-30 ° of angle polishing, disposes the residual thing and the powder of polishing with compressed air;
In clean slush pump on the internal layer surface of pump case matrix (1) with dc welding machine and 68-3 welding rod and UTP83FN Special Casting Iron welding rod earlier with the prime coat (2) of the netted shape layout of employed short arc welding built-up welding one deck in employed short arc welding in the shunting welder skill and the jump welder skill; The fusion length of each short arc welding is 30-60mm, knocks weld seam, eliminates stress, and avoids crackle, the 40-70mm of being separated by between the weld seam of every adjacent two short arc weldings in the shunting welder skill and weld seam are vertical; The lip-deep interlayer temperature of control prime coat (2) is 100-200 ℃ when built-up welding prime coat (2);
Adjacent prime coat (2) with dc welding machine and UTPLEDURIT61 wear resistance electrode on the surface of prime coat (2) respectively with employed short arc welding built-up welding first wearing layer (3) of planting of employed short arc welding and jump welder in the shunting welder skill, the fusion length of short arc welding is 30-60mm, the weld seam of every adjacent two short arc weldings and the weld seam 40-70mm of being separated by between vertically in the shunting welder skill is with additional as the short arc welding of shunting welder skill of the short arc welding of jump welder skill; Do not knock the hardfacing laminar surface when built-up welding first wearing layer (3), controlling the lip-deep interlayer temperature of first wearing layer (3) is 100-200 ℃;
With UTPLEDURIT65 wear resistance electrode and dc welding machine on first wearing layer (3) respectively with shunting welder employed short arc welding built-up welding second wearing layer (4) in employed short arc welding and the jump welder skill of planting, the fusion length of short arc welding is 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill, do not knock the hardfacing laminar surface, controlling the lip-deep interlayer temperature of second wearing layer (4) is 100-200 ℃;
On the surface of second wearing layer (4) with the extraordinary uranami welding electrode of dc welding machine and UTP63 full austenite respectively with employed short arc welding built-up welding separation layer (5) in employed short arc welding in the shunting welder skill and the jump welder skill, the short arc welding fusion length is 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill, do not knock the layer surface of separation layer (5), the lip-deep interlayer temperature of control separation layer (5) is 100-200 ℃;
On the surface of separation layer (5) with dc welding machine and UTPLEDURIT61 wear resistance electrode respectively with employed short arc welding built-up welding the 3rd wearing layer (6) in employed short arc welding in the shunting welder skill and the jump welder skill, do not knock the layer surface of the 3rd wearing layer (6), the short arc welding fusion length is 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill, controlling the lip-deep interlayer temperature of the 3rd anti-wearing layer (6) is 100-200 ℃;
On the 3rd wearing layer (6) surface with dc welding machine and UTPLEDURIT65 wear resistance electrode respectively with employed short arc welding built-up welding the 4th wearing layer (7) in employed short arc welding in the shunting welder skill and the jump welder skill, do not knock the layer surface of the 4th wearing layer (7), the fusion length of short arc welding is 30-60mm, the weld seam of the every adjacent two short arc weldings 40-70mm of being separated by between vertical with weld seam in the shunting welder skill, the skin temperature of controlling the 4th wearing layer (7) is 100-200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100358327A CN100443232C (en) | 2007-09-26 | 2007-09-26 | Method for restoring slurry pump casing used for river and sea dredger |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100358327A CN100443232C (en) | 2007-09-26 | 2007-09-26 | Method for restoring slurry pump casing used for river and sea dredger |
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| Publication Number | Publication Date |
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| CN101121216A CN101121216A (en) | 2008-02-13 |
| CN100443232C true CN100443232C (en) | 2008-12-17 |
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| CNB2007100358327A Expired - Fee Related CN100443232C (en) | 2007-09-26 | 2007-09-26 | Method for restoring slurry pump casing used for river and sea dredger |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4898720B2 (en) * | 2008-02-14 | 2012-03-21 | 三菱重工業株式会社 | Turbine blade repair method |
| CN102398099B (en) * | 2012-01-10 | 2013-03-13 | 中国一拖集团有限公司 | Method for using metal-inert gas welding (MIG) electronic soldering and argon tungsten-arc welding (TIG) to compositely produce antiwear layer |
| CN106141458A (en) * | 2016-07-29 | 2016-11-23 | 广西安讯科技投资有限公司 | The restorative procedure of fire-fighting drawdown pump |
| CN106238914A (en) * | 2016-07-29 | 2016-12-21 | 广西安讯科技投资有限公司 | The welding procedure of automobile-used fire-fighting drawdown pump |
| CN106141477A (en) * | 2016-07-29 | 2016-11-23 | 广西安讯科技投资有限公司 | The welding method of fire-fighting drawdown pump |
| CN106181037A (en) * | 2016-07-29 | 2016-12-07 | 广西安讯科技投资有限公司 | The welding method of fire-fighting drawdown pump for kitchen use |
| CN106925943A (en) * | 2017-04-06 | 2017-07-07 | 中交天津航道局有限公司 | A kind of restorative procedure of rich chromium cast iron material dredging pump impeller |
| CN109693026B (en) * | 2018-12-27 | 2021-09-14 | 中国原子能科学研究院 | Combined surfacing method for excircle large-area stellite alloy hardfacing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1517171A (en) * | 2003-01-09 | 2004-08-04 | ͨ�õ�����˾ | Method for repairing component by welding and its repaired component |
| US7047612B2 (en) * | 2003-05-02 | 2006-05-23 | Caterpillar Inc. | Method for repairing a casting |
-
2007
- 2007-09-26 CN CNB2007100358327A patent/CN100443232C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1517171A (en) * | 2003-01-09 | 2004-08-04 | ͨ�õ�����˾ | Method for repairing component by welding and its repaired component |
| US7047612B2 (en) * | 2003-05-02 | 2006-05-23 | Caterpillar Inc. | Method for repairing a casting |
Non-Patent Citations (6)
| Title |
|---|
| 合成氨净化工段上段泵泵体的焊接修复. 孙斌.中氮肥，第2期. 2006 |
| 合成氨净化工段上段泵泵体的焊接修复. 孙斌.中氮肥，第2期. 2006 * |
| 挖泥船泥浆泵耐磨研究试验. 孙学德.水运工程，第2期. 1991 |
| 挖泥船泥浆泵耐磨研究试验. 孙学德.水运工程，第2期. 1991 * |
| 泥泵磨损防护及修复－第五讲 耐磨材料及泥泵现场修复工艺. 范崇忠，李耀华.水运工程，第10期. 1983 |
| 泥泵磨损防护及修复－第五讲 耐磨材料及泥泵现场修复工艺. 范崇忠，李耀华.水运工程，第10期. 1983 * |
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