CN1111108C - Hidden arc build-up welding method for repairing internal surface of pipe-casting mould - Google Patents
Hidden arc build-up welding method for repairing internal surface of pipe-casting mould Download PDFInfo
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- CN1111108C CN1111108C CN 00123344 CN00123344A CN1111108C CN 1111108 C CN1111108 C CN 1111108C CN 00123344 CN00123344 CN 00123344 CN 00123344 A CN00123344 A CN 00123344A CN 1111108 C CN1111108 C CN 1111108C
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Abstract
The present invention provides technology for repairing cast pipe modules by an automatic submerged arc surfacing welding method. The present invention adopts a manipulator used by deep hole submerged arc welding and selects welding wires, welding agents and welding sticks matching with base materials of cast pipe modules so as to carry out automatic submerged arc surfacing welding to pipe modules of which the inner wall wearing layers of fatigue cracks are removed. The present invention selects welding parameters so as to achieve the optimal match between the welding velocity (linear velocity of the rotation of the inner walls of pipe modules), the welding voltage and the stepping distance after welded for a circle. The present invention adopts a PLC control system to realize the memory positioning control of welded joints so as to achieve the thickness of preset surfacing welding layers and the quality of the desired surfacing welding layers. The present invention can reduce the purchase cost of pipe modules greatly and can reduce production cost.
Description
The invention belongs to the submerged-arc welding method, particularly a kind of submerged arc overlay welding restorative procedure of heat resisting steel cast tube mould inwall.
Major diameter cast tube mould through thousands of time the use after because fatigue wear cracks, several times after the light maintenance in the circle car big and be covered with fatigue crack, unrenewable.Can implement submerged-arc welding to pipe die end wear position at present and repair, can relate to curtailment 1m, and the longest cast tube mould length can reach 10m, this inner walls of deep holes submerged arc overlay welding does not still have implementation method, and its reason is that the welding difficulty is big.At first be that alloying element is below 5% because the cast tube mold materials is a croloy, carbon equivalent is 0.57-0.93%, its welding performance is very poor, alloying element has improved the hardenability of steel significantly, more so, deals with improperly and can crack after postwelding or heat treatment under high cooling velocity.
Next is because the cast tube mould reaches 6-10m, belongs to the deep hole welding, and temperature is very high in the pipe, and on average more than 300 ℃, operating personnel can't enter intraductal operation, during remote-controlled operation, wire feed, send solder flux all can't effectively carry out.
Once more, when in welding process, changing welding wire, be difficult to accurately find joint location, cause Lou weldering or cross weldering.
There are many researchers to attempt to solve these difficult problems at present.Disclose a kind of adjustable dual purpose reactor welder as utility model patent 96236064.3, with the welding gun bar between ignition tip on the welding gun and thrust wire-feed motor lengthening and on the body of ignition tip, pressure cooling system is set, wire-feed motor has not been damaged because of being heated.The welding wire is here carried with flexible pipe, and this has just limited the fed distance of welding wire, and is difficult to accurately location.Simultaneously, this device does not have flux transport equipment yet, therefore can not be applicable to the deep hole submerged arc overlay welding.
Utility application " deep hole submerged-arc welding machinery hand " has solved the protection problem of welding wire, flux delivery problem and the thrust wire-feed motor of deep hole submerged arc overlay welding, provides imperative equipment for solving the reparation of major diameter cast tube mould inwall.This manipulator is assembled in welding wire carrier pipe, cable pipe and solder flux conveying worm in the manipulator of can vertical lift and moving forward and backward; this manipulator can free in and out long cast tube mould; welding wire and solder flux are delivered to welding portion in the deep hole; simultaneously; owing to be provided with cooling water recirculation system; effective cooling has been carried out in manipulator cantilever inside; the influence of not only having protected the thrust wire-feed motor not welded high temperature; manipulator itself is effectively cooled off, thereby can operate steadily in the long term.
The purpose of this invention is to provide a kind of patent application " deep hole submerged-arc welding machinery hand " that utilizes, choose and use welding wire, solder flux, the welding rod that is complementary with the pipe die material, under the control of PLC, finish submerged arc overlay welding process to cast tube mould inwall, in the process flaw detection, after sectional repair, high tempering and the machined, finish repair process to cast tube mould inwall.
Another object of the present invention provides the welding parameter selection scheme in a kind of welding process, to guarantee to obtain best welding effect.
According to hidden arc build-up welding method for repairing internal surface of pipe-casting mould of the present invention, at first damaged layer is removed in cast tube mould inwall boring to be repaired, removing that all crackles are as the criterion and the inner wall overlaying layer to be machined to given size finishing, and takes the following step to the check of overlay cladding with after to defect mending:
1, cast tube mould to be repaired is installed on the automatic positioner that can do stepless speed regulation, and district to be welded is preheating to 250 ℃-300 ℃, the preheating zone width is 80-100mm.
2, will be provided with welding wire feeding system, welding gun, ignition tip, solder flux helical conveyer system and cable pipe, can free lifting and the automatic submerged arc welding machine deep hole submerged-arc welding machinery hand that moves forward and backward put in cast tube mould inwall, welding gun is aimed at position to be repaired.
3 select welding wire, the solder flux that is complementary with mother metal for use, and the automatic submerged arc welding thrust wire-feed motor of packing into and solder flux storehouse under the control of PLC, start submerged arc welding machine and begin welding process.
4, finish built-up welding after 24 hours at whole cast tube mould inwall, overlay cladding is carried out the ultrasonic examination inspection, as finding defectiveness, repair with the welding rod that is complementary with mother metal.
5, built-up welding is intact qualified cast tube mould carries out high tempering in 580 ℃ of-700 ℃ of temperature ranges.
To be machined to given size at last through the cast tube mould inwall of temper, finish whole repair process.
Cast tube mould material is generally the low-alloy chrome-molybdenum steel, selects the R307 welding rod in the time of will selecting H08CrMoA welding wire and HJ251 solder flux, correction of the defect this moment for use for use.
In order to obtain best welding effect, to in described welding process, realize the optimum Match of welding parameter: gage of wire φ 1.6mm-3.2mm, welding current is selected 250-350A for use, weldingvoltage 30-38V, speed of welding is selected 260-350mm/min for use, and the length that welding wire stretches out welding gun is
For low-alloy chrome-molybdenum steel cast tube mould, welding parameter is selected for use: when gage of wire is selected φ 1.6mm, φ 2.0mm, φ 2.4mm or φ 3.2mm for use, corresponding welding current is selected 250-280A, 300-330A, 350-380A or 380-400A for use, weldingvoltage is selected 30-32V, 32-34V, 34-36V or 36-38V for use, speed of welding is selected 260-280mm/min, 280-300mm/min or 310-330mm/min, 330-350mm/min for use, and the length that welding wire stretches out welding gun is 18-20mm, 20-25mm, 25-30mm or 30-32mm.
In the PLC of automatic submerged arc welding machine control system, be provided with pad coordinate position memory and control system in length and breadth.Solve because of changing in the built-up welding way that welding wire, accident have a power failure midway or after other temporary derangement stops welding, the problem of starting the arc location difficulty has again accomplished that joint does not move partially again, and coordinate position is constant in length and breadth.
Whole welding process is controlled by the PLC control system, comprise the automatic positioner pipe die of the stepless speed regulation inwall turning spur speed of using for pipe die build-up welding, i.e. the SCR control of speed of welding, the memory positioning control of welding point, the stepping control in an intact week of every weldering, the adjusting of weldingvoltage etc.Control the thickness of overlay cladding by regulating weldingvoltage, speed of welding, step distance, the step distance in an intact week of every weldering is little, and overlay cladding is just high, otherwise overlay cladding is just low; Weldingvoltage is low, illustrates that welding wire feeding speed is fast, and overlay cladding is just high, otherwise weldingvoltage increases, and welding wire feeding speed slows down, and overlay cladding is just thin; Equally, the positioner rotary speed is slow, and overlay cladding is just high, otherwise positioner speed is fast, and promptly speed of welding is fast, and overlay cladding is just thin.Therefore can select the optimum Match of welding parameter as required, reach predetermined overlay cladding thickness requirement.
Because chrome-moly steel is very sensitive to temperature, so will keep the preheat temperature of welding portion can not be lower than set point of temperature all the time, if can not work continuously for some reason, as forced outage, when changing welding wire or other mechanical breakdown, must take the insulation measure to surfacing part, prevent the rapid decline of welding position temperature.
The pre-heating mean of cast tube mould can adopt coal gas heating, gas welding flame heat or electrical heating.
Identical when finding technological requirement that defective repairs and carrying out submerged arc overlay welding for the postwelding inspection.Work for inspection should can be carried out seam inspection after 24 hours finishing built-up welding,
According to method of the present invention cast tube mould inwall is repaired, obtained good effect, can save the fund of purchasing pipe die in a large number, significantly reduce production costs.
Claims (5)
1. hidden arc build-up welding method for repairing internal surface of pipe-casting mould, comprise damaged layer is removed in cast tube mould inwall boring to be repaired, with remove that all crackles are as the criterion and after finishing built-up welding to the check of weld layer with to behind the defect mending inner wall overlaying layer being machined to given size, it is characterized in that:
(1) cast tube mould to be repaired is installed on the automatic positioner that can do stepless speed regulation, and district to be welded is preheating to 250-300 ℃, the preheating zone width is 80-100mm,
(2) will be provided with welding wire feeding system, welding gun, ignition tip, solder flux helical conveyer system and cable pipe, can free lifting and the automatic submerged arc welding machine deep hole submerged-arc welding machinery hand that moves forward and backward put in cast tube mould inwall, welding gun is aimed at position to be repaired,
(3) select welding wire, the solder flux that is complementary with mother metal for use, the thrust wire-feed motor of the automatic submerged arc welding machine of packing into and solder flux storehouse under the control of PLC, start submerged arc welding machine and begin welding process,
(4) finish built-up welding after 24 hours at whole cast tube mould inwall, overlay cladding carried out the ultrasonic examination inspection, as finding defectiveness, repair with the welding rod that is complementary with mother metal,
(5) built-up welding is intact qualified cast tube mould carries out high tempering in 580 ℃ of-700 ℃ of temperature ranges.
2. hidden arc build-up welding method for repairing internal surface of pipe-casting mould according to claim 1 is characterized in that selecting the R307 welding rod when selecting H08CrMoA welding wire and HJ251 solder flux, correction of the defect for use for use when cast tube mould material is the low-alloy chrome-molybdenum steel.
3. hidden arc build-up welding method for repairing internal surface of pipe-casting mould according to claim 1, it is characterized in that in described welding process, realizing the optimum Match of welding parameter, gage of wire φ 1.6mm-3.2mm, welding current is selected 250-350A for use, weldingvoltage is selected 30-38V for use, speed of welding is selected 260-350mm/min for use, and the length that welding wire stretches out welding gun is 18-32mm.
4. according to claim 1 or 3 hidden arc build-up welding method for repairing internal surface of pipe-casting mould, it is characterized in that for low-alloy chrome-molybdenum steel cast tube mould, welding parameter is selected for use: gage of wire is selected φ 1.6mm for use, φ 2.0mm, when φ 2.4mm or φ 3.2mm, corresponding welding current is selected 250-280A for use, 300-330A, 350-380A or 380-400A, weldingvoltage is selected 30-32V for use, 32-34V, 34-36V or 36-38V, speed of welding is selected 260-280mm/min for use, 280-300mm/min, the length that 310-330mm/min or 330-350mm/min, welding wire stretch out welding gun is 18-20mm, 20-25mm, 25-30mm or 30-32mm.
5. according to claim 1 hidden arc build-up welding method for repairing internal surface of pipe-casting mould, it is characterized in that being provided with pad coordinate position memory and positioning control system in length and breadth in the PLC control system of described automatic submerged arc welding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00123344 CN1111108C (en) | 2000-11-30 | 2000-11-30 | Hidden arc build-up welding method for repairing internal surface of pipe-casting mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00123344 CN1111108C (en) | 2000-11-30 | 2000-11-30 | Hidden arc build-up welding method for repairing internal surface of pipe-casting mould |
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| Publication Number | Publication Date |
|---|---|
| CN1355080A CN1355080A (en) | 2002-06-26 |
| CN1111108C true CN1111108C (en) | 2003-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00123344 Expired - Fee Related CN1111108C (en) | 2000-11-30 | 2000-11-30 | Hidden arc build-up welding method for repairing internal surface of pipe-casting mould |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436021C (en) * | 2003-12-10 | 2008-11-26 | 上海工程技术大学 | An Automatic built up welding method and equipment |
| CN100457354C (en) * | 2007-01-10 | 2009-02-04 | 哈尔滨汽轮机厂有限责任公司 | Pile-up welding method of turbine low pressure heater pipe plate and shell, water chamber junction |
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| CN100434222C (en) * | 2006-08-10 | 2008-11-19 | 上海人造板机器厂有限公司 | Welding process and apparatus for major diameter roller |
| CN100413628C (en) * | 2006-08-22 | 2008-08-27 | 上海人造板机器厂有限公司 | Welding method for large breadth die steel board |
| 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 |
| CN102000788A (en) * | 2010-09-30 | 2011-04-06 | 南基弘 | Pipe die recycling method |
| CN102179607B (en) * | 2011-04-20 | 2012-11-07 | 西安长庆科技工程有限责任公司 | Submerged automatic arc welding system |
| CN102240897A (en) * | 2011-05-09 | 2011-11-16 | 新兴铸管股份有限公司 | Method for manufacturing water-cooling type double-metal pipe die |
| CN102248267A (en) * | 2011-07-25 | 2011-11-23 | 中国石化集团第四建设公司 | Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology |
| CN106002082B (en) * | 2016-08-04 | 2018-03-06 | 新兴铸管股份有限公司 | A kind of pipe die bellmouth restorative procedure |
| CN106925862B (en) * | 2017-03-22 | 2020-03-24 | 平朔煤炭工业公司 | Performing CO treatment on a hydraulic support upright column piston rod2Arc surfacing repair method |
| CN109352198A (en) * | 2018-11-23 | 2019-02-19 | 芜湖新兴铸管有限责任公司 | A kind of welding method of pipe die |
| CN110814632B (en) * | 2019-09-29 | 2021-10-26 | 广州黄船海洋工程有限公司 | Surfacing process method for cast steel anchor lip line type repair |
| CN112475560A (en) * | 2020-11-19 | 2021-03-12 | 黄石市高潮工矿机械有限公司 | Welding flux for repairing pipe die and pipe die repairing method |
-
2000
- 2000-11-30 CN CN 00123344 patent/CN1111108C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100436021C (en) * | 2003-12-10 | 2008-11-26 | 上海工程技术大学 | An Automatic built up welding method and equipment |
| CN100457354C (en) * | 2007-01-10 | 2009-02-04 | 哈尔滨汽轮机厂有限责任公司 | Pile-up welding method of turbine low pressure heater pipe plate and shell, water chamber junction |
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| CN1355080A (en) | 2002-06-26 |
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