CN100445021C - Welding repair method for specific steel and its welding wire - Google Patents
Welding repair method for specific steel and its welding wire Download PDFInfo
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- CN100445021C CN100445021C CNB2006101070990A CN200610107099A CN100445021C CN 100445021 C CN100445021 C CN 100445021C CN B2006101070990 A CNB2006101070990 A CN B2006101070990A CN 200610107099 A CN200610107099 A CN 200610107099A CN 100445021 C CN100445021 C CN 100445021C
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Abstract
The present invention discloses welding repair method and welding wire for steel rail, Bell frog and switch rail. The welding wire contains C 0.3-0.7 wt%, B 1.5-3.5 wt%, Ni 3-5 wt%, Cr 0.6-2 wt%, Si 3-4 wt%, Mo 3-7 wt% and Fe for the rest. The welding repair method includes burning off the hardened layer, oxidized layer and fine crack in the welding repair part with gas welding torch; heating the welding repair part to 1500-1700 deg.c to melt while heating the welding wire to melt, welding repairing, local quenching with water after the welded part is cooled to 400-500 deg.c, and polishing the welded part with a polisher. The present invention can welding repair steel rail, Bell frog and switch rail, has fast welding repair speed and low welding wire cost, and is suitable for in-situ operation.
Description
One, technical field:
The present invention relates to the repair welding method and the welding wire thereof of special steel, particularly relate to the repair welding method and the welding wire thereof of rail, Bel's frog and tongue.
Two, technical background: along with high speed, the heavy duty of China Railway, the damage of rail is on the rise.The main cause of rail failure has two kinds: the one, because the damage that the weight of rail self causes, this damage not only seriously jeopardizes traffic safety, and can not repair, and can only more renew rail; The 2nd, to be rail produce in normal operation in quite a few damage, as peeling off of the abrasion of rail part, rail level scratch, rail-head quenching layer etc.Train by the time huge impact load also accelerated the development of hurt position crackle and formed the horizontal fatigue crack of rail head, reduce line quality, influence traffic safety.So must carry out field maintenance to rail at any time, make rail level keep the good technical state, prolong the useful life of rail, reduce the maintenance work amount of circuit, give full play to and excavate the use potentiality of circuit,, increase economic efficiency to guarantee safety and normal transport.
Rail comprises common rail, Bel's frog and tongue, and they all belong to special steel.The method of present common rail repair welding mainly contains surfacing and arc welding, and the repair welding technology of Bel's frog and tongue is not also launched at present at home.Bel's frog is a kind of novel alloy steel assembly unit track switch that Zhejiang Bel group develops in recent years, and this track switch is different fully with original manganese steel track switch, and its welding repairing process is also different with manganese steel track switch.Because do not have the repair welding technology of Bel's frog, in a single day this track switch has the damage of critical traffic safety, has only replacing.At this situation, we develop the welding wire and the welding repairing process of a kind of energy repair welding Bel frog, tongue and rail on the basis of original repair welding technology and solder flux, filled up the blank of Bel's frog and tongue repair welding.
Three, summary of the invention:
Purpose of the present invention: welding wire and welding repairing process that a kind of energy repair welding Bel frog, tongue and rail are provided.
Technical scheme of the present invention:
A kind of welding wire that is used for the special steel repair welding is represented with percentage by weight, contains carbon 0.3～0.7% in the composition of composition welding wire, boron 1.5～3.5%, and nickel 3～5%, chromium 0.6～2%, silicon 3～4%, molybdenum 3～7%, surplus is an iron.
In the described welding wire, carbon 0.3～0.7%, boron 1.5～2.5%, nickel 3～5%, chromium 1～2%, silicon 3～4%, molybdenum 5～7%, surplus is an iron.
Carbon 0.3～0.7% in the described welding wire, boron 2.5～3.5%, and nickel 3～5%, chromium 0.6～1%, silicon 3～4%, molybdenum 3～5%, surplus is an iron.
Carbon 0.3～0.7% in the described welding wire, boron 2～3%, and nickel 3～5%, chromium 1～1.5%, silicon 3～4%, molybdenum 4～6%, surplus is an iron.
Described special steel is Bel's frog with steel or sharp rail steel.
A kind of repair welding method of special steel comprises the preceding preparation of weldering, repair welding and postwelding finishing technique, and its technology is:
(1) pre-preceding the preparation removed hardened layer, oxide layer and the blind crack sintering on surface, repair welding position with gas welding torch,
(2) repair welding is heated to 1500～1700 ℃ with the repair welding position, makes the surface of the work fusing; The special steel welding wire also is heated to molten state, and workpiece is repaiied in welding wire fusing of marginization, side weld during repair welding,
(3) after quenching treated that the repair welding position naturally cools to 400～500 ℃, the selective hardening processing was carried out in the water gradation,
(4) postwelding arrangement postwelding adopts sander suitable to repair welding position sanding of flat.
After the postwelding arrangement,, then need to correct in the described repair welding method if the welding district is cooled to the low phenomenon of collapsing occur behind the normal temperature.
In the described repair welding method, special steel is Bel's frog with steel or sharp rail steel.
Described welding wire production method is: with industrial converter iron is melted earlier, add compositions such as carbon, boron, nickel, chromium, silicon and molybdenum again, after continuing to be heated to fusing, go into die casting and become mother metal, mechanical stretching becomes the round steel of 5～6mm again; Cutting into 0.5～1 meter long welding wire at last gets final product.
Ultrasonic examination is adopted at postwelding repair welding position, measures hardness with portable Rockwell hardness tester, requires the layer Rockwell hardness to reach 39～42, just meets the requirements.
The present invention has following advantage:
1. welding wire of the present invention and welding repairing process can not only the common rail of repair welding, and can repair welding Bel's frog and tongue, filled up the blank that Bel's frog and tongue in the past can not repair weldings.
2. novel welding wire of the present invention contains multiple trace alloying elements such as Mn, Cr, Mo, Ni, has good welding repairing process performance, postwelding tissue intensity height, and good toughness, wearability are good, have good cracking resistance and serviceability; And this welding wire cost is low, 4.3 yuan of per kilograms, and about 80 yuan of original rail solder flux per kilograms, and single solder flux calculates the repair welding cost and reduces nearly 20 times.If a workshop section is by annual repair welding 1000 places, every place needs 3 kilograms of solder flux to calculate, and every year, only one of solder flux can be saved more than 20 ten thousand yuan of costs.
3. by repair welding method of the present invention original damage discarded Bel's frog and tongue are utilized again, can save a large amount of production costs.Before this invention, as long as the hurt of train operating safety appears jeopardizing in Bel's frog and tongue, as occur crackle, cracked, fall breakage such as piece, just must change.Suppose that a workshop section is annual if need to change 200 groups of Bel's frogs, 100 tip of a root rails, wherein Bel's frog is by every group of 2.7 ten thousand yuan of calculating, and tongue is by every 0.8 ten thousand yuan of calculating, by repair welding Bel frog and tongue, can save more than 600 ten thousand yuan every year, remarkable in economical benefits, it is bigger to promote the use of prospect.
4. adopt welding wire of the present invention and welding repairing process, operating efficiency improves greatly.Originally the damage of rail repair welding one director 300mm, dark 20mm needs 6～7 hours consuming time, now adopt method of the present invention only to need 1 hour can finish repair welding, saved most of repair welding time, alleviated labour intensity, be subjected to liking of repair welding field worker deeply, this method is more suitable for the on-the-spot repair welding operation of current busy trunk railway.
5. adopt welding wire of the present invention and welding repairing process, through facts have proved, repair welding is respond well.
At new He Xianchangyuan station 11# switch blade rail root the piece that falls of one long 80mm, dark 30mm was arranged once, and adopted method of the present invention behind repair welding in March, 2003, and can continue normally to run, when need more renew rail in May, 2006, the tongue of this repair welding ability was normally changed.Good through the tongue part operational effect of repair welding during this period, any problem does not appear.
At new lotus line K104, No. 40 rail, once found to have the piece that falls of a long 50mm, dark 20mm, wide 65mm, detected a flaw to severely injured, after adopting method repair welding of the present invention in March, 2002, this section operation is so far, and is respond well.
At the up 8# track switch in new station, lotus line Dongming County, be the steel alloy track switch that Zhejiang Bel group produces, change less than one-year age, find partly to occur the piece that falls of a long 300mm, dark 30mm at heart rail.After adopting method repair welding of the present invention on June 24th, 2006, this section operation is respond well so far.
Four, the specific embodiment:
The welding repairing process and the welding wire thereof of embodiment one, Bel's frog, tongue and rail
1. repair welding facility:
(1) polishing facility
Adopt GM-6 rail electrodynamic type sander, or portable abrasive machine (supporting with the F150 generating set), the grinding wheel material is No. 250 white fused aluminas, granularity is 24～28.
(2) gas welding facility and pertinent instruments
H-2 type single hole gas welding torch, SGJ-60 type correcting instrument, oxygen cylinder (interior dress oxygen), oxygen regulator, acetylene gas bottle (interior dress acetylene), acetylene regulator;
1 meter straight steel ruler of special use, clearance gauge, portable timepiece millet cake temperature meter, supersonic detector, portable Rockwell hardness tester, cleansing pin, burning torch, stopwatch, rail temperature meter etc.
(3) welding wire
Wire composition: carbon 0.3%, boron 3.5%, nickel 5%, chromium 0.6%, silicon 4%, molybdenum 3%, surplus is an iron.
The welding wire production method: with industrial converter iron is melted earlier, add compositions such as carbon, boron, nickel, chromium, silicon and molybdenum again, continue to be heated to and go into die casting after the fusing and become mother metal, mechanical stretching becomes the round steel of 5～6mm again; Being cut into 0.5～1 meter long welding wire at last gets final product.
2. welding repairing process
The welding repairing process of Bel's frog, tongue and rail
(1) prepares to unclamp the bolt for the treatment of on three adjacent under welding zone cement pillows before the weldering, take out rubber cushion, change the iron chair suitable into (on thick 8～10mm) pads of iron chair, with anti-deformation with rubber cushion thickness.
With gas welding torch hardened layer, oxide layer and the blind crack sintering on surface, repair welding position are removed, the length at preliminary treatment repair welding position generally should be less than 300 millimeters.When the repair welding position was long, sectional was handled.
(2) repair welding is heated to 1500～1700 ℃ with the oxy arc of welding gun with the repair welding position, makes the surface of the work fusing; The special steel welding wire also is heated to molten state, and workpiece is repaiied in welding wire fusing of marginization, side weld during repair welding, requires welding wire can not leave the molten bath all the time.Heating-up temperature requires to keep the viscosity and the flowability of welding wire in the molten bath, the oxidized and low excessively phenomenon of temperature in repair welding position must not occur.
When treating that the repair welding position naturally cools to 400～500 ℃, the gradation water carries out selective hardening to be handled, and determines each water consumption according to the repair welding area, generally divides 3～7 quenchings, and temperature is reduced to below 200 ℃ until the repair welding position.
(3) postwelding arrangement postwelding adopts the GM-6 sander that repair welding position sanding of flat is suitable, and the input of giving of emery wheel can not be excessive during polishing, the royal purple color spot can not occur during polishing.Till polishing was extremely smooth-going, requiring the rail surface smoothness was 0～0.3mm.
(4) correct if the welding district is cooled to occur caving in behind the normal temperature (available 1 meter straight steel ruler is measured), need to correct with SGJ-60 type correcting instrument.
Antidote: correct in vertical corresponding flange of rail both sides, welding district, temperature is controlled between 600～723 ℃ during rectification.Once correct undesirablely, can divide 2～3 rectifications, till the leveling.The rectification scope must not surpass the welding scope.
Embodiment two, welding repairing process and embodiment one are basic identical, and difference is:
The composition of forming welding wire: carbon 0.7%, boron 1.5%, nickel 3%, chromium 0.6%, silicon 3%, molybdenum 7%, surplus is an iron.
All the other steps no longer repeat with embodiment one.
Embodiment three, welding repairing process and embodiment one are basic identical, and difference is:
The composition of forming welding wire: carbon 0.5%, boron 2.0%, nickel 4%, chromium 0.8%, silicon 3.5%, molybdenum 4%, surplus is an iron.
All the other steps no longer repeat with embodiment one.
Embodiment four, welding repairing process and embodiment one are basic identical, and difference is:
The composition of forming welding wire: carbon 0.6%, boron 3.0%, nickel 4%, chromium 1.5%, silicon 3.5%, molybdenum 6%, surplus is an iron.
All the other steps no longer repeat with embodiment one.
Claims (8)
1. welding wire that is used for the special steel repair welding is characterized in that: represents with percentage by weight, forms in the composition of welding wire and contain carbon 0.3～0.7%, and boron 1.5～3.5%, nickel 3～5%, chromium 0.6～2%, silicon 3～4%, molybdenum 3～7%, surplus is an iron.
2. welding wire according to claim 1 is characterized in that: carbon 0.3～0.7% in the wire composition, boron 1.5～2.5%, and nickel 3～5%, chromium 1～2%, silicon 3～4%, molybdenum 5～7%, surplus is an iron.
3. welding wire according to claim 1 is characterized in that: carbon 0.3～0.7% in the wire composition, boron 2.5～3.5%, and nickel 3～5%, chromium 0.6～1%, silicon 3～4%, molybdenum 3～5%, surplus is an iron.
4. welding wire according to claim 1 is characterized in that: carbon 0.3～0.7% in the wire composition, boron 2～3%, and nickel 3～5%, chromium 1～1.5%, silicon 3～4%, molybdenum 4～6%, surplus is an iron.
5. welding wire according to claim 1 is characterized in that: described special steel for Bel's frog with steel or sharp rail steel.
6. the repair welding method of a special steel comprises the preceding preparation of weldering, repair welding and postwelding finishing technique, it is characterized in that:
(1) pre-preceding the preparation removed hardened layer, oxide layer and the blind crack sintering on surface, repair welding position with gas welding torch,
(2) repair welding is heated to 1500～1700 ℃ with the repair welding position, makes the surface of the work fusing; The described welding wire of claim 1 also is heated to molten state, and workpiece is repaiied in the side weld of welding wire fusing of margin during repair welding,
(3) after quenching treated that the repair welding position naturally cools to 400～500 ℃, the selective hardening processing was carried out in the water gradation,
(4) postwelding arrangement postwelding adopts sander suitable to repair welding position sanding of flat.
7. repair welding method according to claim 6 is characterized in that: after the postwelding arrangement, if the welding district is cooled to the low phenomenon of collapsing occur behind the normal temperature, then need to correct in the described repair welding method.
8. repair welding method according to claim 6 is characterized in that: described special steel for Bel's frog with steel or sharp rail steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101070990A CN100445021C (en) | 2006-09-25 | 2006-09-25 | Welding repair method for specific steel and its welding wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101070990A CN100445021C (en) | 2006-09-25 | 2006-09-25 | Welding repair method for specific steel and its welding wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1943963A CN1943963A (en) | 2007-04-11 |
| CN100445021C true CN100445021C (en) | 2008-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101070990A Expired - Fee Related CN100445021C (en) | 2006-09-25 | 2006-09-25 | Welding repair method for specific steel and its welding wire |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103785924A (en) * | 2014-01-21 | 2014-05-14 | 首钢总公司 | Method for bead welding repair of high manganese steel cast steel frog and steel rail |
| CN113664455B (en) * | 2021-07-15 | 2023-10-20 | 中钢集团邢台机械轧辊有限公司 | Method for repairing abrasion of guide rail of machine tool body |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03221294A (en) * | 1990-01-23 | 1991-09-30 | Kobe Steel Ltd | Mig wire for high tensile steel |
| JPH03294084A (en) * | 1990-04-12 | 1991-12-25 | Daido Steel Co Ltd | Welding wire for high-hardness build-up welding |
| US6852940B1 (en) * | 2004-02-23 | 2005-02-08 | Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. | Welding device |
| CN1727108A (en) * | 2004-05-18 | 2006-02-01 | 株式会社神户制钢所 | Welding wire for modified 9Cr-1Mo steel, and submerged-arc welding material |
-
2006
- 2006-09-25 CN CNB2006101070990A patent/CN100445021C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03221294A (en) * | 1990-01-23 | 1991-09-30 | Kobe Steel Ltd | Mig wire for high tensile steel |
| JPH03294084A (en) * | 1990-04-12 | 1991-12-25 | Daido Steel Co Ltd | Welding wire for high-hardness build-up welding |
| US6852940B1 (en) * | 2004-02-23 | 2005-02-08 | Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. | Welding device |
| CN1727108A (en) * | 2004-05-18 | 2006-02-01 | 株式会社神户制钢所 | Welding wire for modified 9Cr-1Mo steel, and submerged-arc welding material |
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| CN1943963A (en) | 2007-04-11 |
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Effective date of registration: 20110420 Address after: Changyuan County, Henan province 453400 Di Xiang Zhao Zhao Di Cun Patentee after: Dong Yunsheng Address before: Changyuan County, Henan province 453400 Di Xiang Zhao Zhao Di Cun Co-patentee before: Li Daying Patentee before: Dong Yunsheng Co-patentee before: Gou Yang |
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Owner name: HAO JUNQING YANG XIANPING ZHANG MING GUO CHUANWEI Effective date: 20121205 |
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Effective date of registration: 20121205 Address after: Han Chao Cun, Neihuang County town of East Henan province 453400 No. 216 Patentee after: Dong Yunsheng Patentee after: Hao Junqing Patentee after: Yang Xianping Patentee after: Zhang Ming Patentee after: Guo Chuanwei Address before: Changyuan County, Henan province 453400 Di Xiang Zhao Zhao Di Cun Patentee before: Dong Yunsheng |
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Effective date of registration: 20160330 Address after: Han Chao Cun, Neihuang County town of East Henan province 453400 No. 216 Patentee after: Dong Yunsheng Patentee after: Zhang Ming Address before: Han Chao Cun, Neihuang County town of East Henan province 453400 No. 216 Patentee before: Dong Yunsheng Patentee before: Hao Junqing Patentee before: Yang Xianping Patentee before: Zhang Ming Patentee before: Guo Chuanwei |
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