CN102166687B - Preparation method of heat-resisting steel tube instant liquid phase diffusion connection interlayer alloy - Google Patents
Preparation method of heat-resisting steel tube instant liquid phase diffusion connection interlayer alloy Download PDFInfo
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Abstract
The invention provides a preparation method of heat-resisting steel tube instant liquid phase diffusion connection interlayer alloys, comprising the following steps: carrying out leveling processing on a connection interface of a heat-resisting steel tube to lead the end face of the steel tube to be straight; cleaning and deoiling the end face of the steel tube by alcohol or acetone; carrying out sand blasting and roughening treatment; preparing an NiCrFeBSi nickel-base self-fluxing property alloy interlayer at one side of the connection interface of the steel tube by a microbeam plasma spraying method; and adopting argon as a plasma gas and a powder delivery gas, wherein the process parameters are as follows: the spraying voltage is 32V-38V, the spraying current is 20A-65A, the spraying distance is 30-120mm, the argon flow is 0.8-3.0L/min, the deposition beam spot diameter is 3-10mm, and the thickness of the acquired interlayer is 50-100 mu m; and carrying out instant liquid phase diffusion connection. Compared with the method adopting an amorphous foil band alloy interlayer, the preparation method has simple operation and strong applicability, can save high-alloy interlayer material and is beneficial for being popularized.
Description
Technical field:
The invention belongs to the heat resisting steel welding technology field, be specifically related to the preparation method that the instantaneous Liquid Phase Diffusion of a kind of heat resisting pipe connects the intermediate layer alloy.
Background technology:
Along with improving constantly of power station unit capacity, scale and parameter, thermal power plant's therrmodynamic system experienced from low pressure → pressure → high pressure → super-pressure → precritical development upgrading.Because the raising of vapor (steam) temperature and pressure, the performances such as creep resistant, antifatigue, resistance to high temperature oxidation and corrosion of fired power generating unit heat resisting steel have all been proposed harsher requirement, when using New Heat-Resistant Steel, the Welding Problems of necessary these steel of solution.
China's used heat resisting steel of present power station thermal power generation unit mainly contains T91 (9Cr-1MoVNb) steel, T92 steel, 12Cr2MoWVTiB steel, Super304H steel, 102 steel etc., and these steel adopt conventional welding methods, do not obtain desirable effect as yet.Conventional melting method such as submerged-arc welding, manual electric arc welding, TIG weldering, MIG weldering and MAG weldering etc. form the weld seam and the heat affected area of broad usually, are easy to generate bigger welding deformation and residual stress.High energy beam current welding method (electron beam welding and method for laser welding etc.) is though centralized heat energy; The overall thermal input quantity obviously descends; The joint area (weld seam and heat affected area) that forms is significantly less than conventional melting method, and property of welded joint and precision improve a lot, but the high energy beam current welding method still belongs to one type of melting; Its welding temperature has surpassed the mother metal fusing point, unavoidably can cause fire damage to mother metal.Plasticity method of attachment (like friction welding (FW)) is though connect temperature under the mother metal fusing point, and lower to the mother metal Effect on Performance, there is the structural weakness district in joint, and the joint bond strength is limited.To connect the harmful effect of technology in order reducing, to spread method of attachment in recent years and obtained development faster the mother metal structure property.
Instantaneous Liquid Phase Diffusion connects (Transient liquid-phase bonding, abbreviation TLP) and in the welding of heat resisting steel pipeline, receives extensive concern as a kind of novel solder technology.Its principle is between connected pipeline, to preset the low-melting alloy intermediate layer; Between mother metal, form low-melting liquid phase after the pressurized, heated; Under uniform temperature and pressure, utilize the rapid diffusion of alloying element to make the instantaneous liquefaction of mother metal, and isothermal solidification and accomplish welding process subsequently.As the intermediate layer that TPL connects, must possess following condition: 1) fusing point is lower than mother metal; 2) and the wetability between mother metal good; 3) do not form harmful intermetallic compound; 4) the completion isothermal solidification is fast; 5) homogenization of composition is fast.From present power station steel pipe and the record of petroleum pipeline diffusion join dependency document; Instantaneous Liquid Phase Diffusion like the T91 steel pipe connects, the instantaneous Liquid Phase Diffusion of TP304H steel pipe connects, the research work such as instantaneous Liquid Phase Diffusion connection of TP304H/12CrMoV heterogenous steel pipe can know that it is amorphous paper tinsel band alloy that Fe-Ni-Cr-Si-B is mainly adopted in the intermediate layer.The advantage in this amorphous paper tinsel band alloy intermediate layer is the thickness homogeneous and controllable, composition even and relative " cleaning ", and promptly impurity content is low, need not bonding agent, and welding effect is good.But its weak point is an amorphous paper tinsel band complicated process of preparation, and cost is high, with the intermediate layer of pipe diameter and wall thickness cutting suitable shape, particularly have certain difficulty for profiled-cross-section pipeline and large-diameter pipeline, and utilization rate is lower.Utilize the microplasma spraying self-fluxing alloyed powder to prepare the method in intermediate layer, can effectively overcome the shortcoming that above-mentioned amorphous paper tinsel band alloy intermediate layer exists.Through retrieval, the relevant method that adopts the microplasma spraying self-fluxing alloyed powder to prepare the intermediate layer rarely has report.
Summary of the invention:
Connect the problem that amorphous paper tinsel band alloy intermediate layer exists to the instantaneous Liquid Phase Diffusion of existing heat resisting pipe; The present invention develops the preparation method that the instantaneous Liquid Phase Diffusion of a kind of heat resisting pipe connects the intermediate layer alloy; The problem that this method will solve is to adopt the microplasma spraying self-fluxing alloyed powder, prepares the method that the intermediate layer realizes that instantaneous Liquid Phase Diffusion connects at the heat resisting pipe linkage interface.Adopt this method, can prepare the intermediate layer alloy quickly and easily, satisfy the requirement that instantaneous Liquid Phase Diffusion connects high strength weld joints at heat resisting pipe (comprising regular shape and profiled-cross-section shape steel pipe) linkage interface.
Main technical schemes of the present invention is to utilize microplasma spraying equipment, adopts NiCrFeBSi self-fluxing alloyed powder (commercially available Ni based spray-welded powder) preparation intermediate layer.Specifically, be after heat resisting pipe linkage interface place handles through the purification roughening, adopt microplasma spraying technology in the enterprising interline layer spraying of its linkage interface preparation, carry out the intermediate layer for the instantaneous Liquid Phase Diffusion connection of heat resisting pipe subsequently and preset work.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is:
The instantaneous Liquid Phase Diffusion of a kind of heat resisting pipe connects the preparation method of intermediate layer alloy, and this method may further comprise the steps:
The first step, to the heat resisting pipe linkage interface, promptly end face carries out turning or cutting, make the steel pipe end face straight and with conduit axis to be 90 ° of angles vertical;
Before second step, the spraying heat resisting pipe linkage interface is carried out preliminary treatment: be meant to the steel pipe end face that with alcohol or acetone oil removing sandblast roughening processing is carried out on surface to be sprayed, make it to expose the metal surface of clean roughening;
The 3rd step, employing microplasma spraying method spray the intermediate layer to a side of heat resisting pipe linkage interface, and it is spherical NiCrFeBSi nickel base self-fluxing alloy powder that the intermediate layer spray coating alloy uses material, particle size range 45～15 μ m; Its composition is by percentage to the quality: chromium Cr 0～16%, iron Fe 6～14%wt, boron 1.5～3.5%wt; Silicon Si 2.5～4.0%wt; Carbon C 0.1～0.8%wt, cobalt Co 10%wt, surplus is a nickel;
The 4th step, employing argon gas are as plasma gas and powder feeding gas; Its technological parameter is: spray voltage 32V～38V, spraying current 20A～65A, spray distance 30～120mm; Argon flow amount 0.8～3.0L/min; Deposition beam spot diameter, 3mm～10mm, the intermediate layer thickness 50 μ m～100 μ m of acquisition carry out instantaneous Liquid Phase Diffusion then immediately and connect.
Further, the optimal process parameter described in the step 4: spray voltage 34V～36V, spraying current 35A-50A, spray distance 40～100mm, argon flow amount 1.0～2.5L/min, deposition beam spot diameter, 4mm～8mm, the intermediate layer thickness 60 μ m～90 μ m of acquisition.
Good effect of the present invention is:
1, of the present inventionly prepares in the method for intermediate layer alloy at the heat resisting pipe end face; Employed material is a self-fluxing alloyed powder; Good " from brazing flux " effect is arranged, do not form stable harmful phase, fusing point is between 950～1300 ℃; Be lower than the fusing point that is connected the heat resisting steel mother metal, satisfy the condition that intermediate layer that TPL connects must possess; When pressurized, heated, the intermediate layer alloy cross flow successfully of having melted is that intermediate layer/mother metal forms the alloy transition layer in the mother metal surface, thereby form metallurgical binding good dissolving, diffusion conditions is provided; Because the middle layer main body component is a nickel, chromium Cr and cobalt Co can make the weld metal zone equally possess high temperature oxidation resistance, corrosion resistance, anti-low-temperature brittle fracture performance etc. with mother metal after the welding.
2, of the present inventionly prepare in the method for intermediate layer alloy at the heat resisting pipe end face; Because employed microplasma spraying system adopts argon gas as plasma gas and powder feeding gas; Can prevent that powder from heating sprayed coating process further oxidation taking place, to guarantee " pure " of intermediate layer alloying component; Because beam-plasma becomes tight pencil, the particle beam sedimentation diameter can be contracted to 3～5 mm, sprays in the thin-wall steel tube end, has improved the utilization rate of dusty spray; Because the power of the APS that the microplasma spraying power ratio is traditional is much little, when the spraying thin-wall pipe, can avoid the local overheated centering welding that has influence on being out of shape subsequently; Because plasma gas flow little (maximum is selected about 2.5 L/ min for use) during work can effectively utilize plasma gas, reduces cost.
3, adopt microplasma spraying of the present invention to prepare the method for intermediate layer alloy; It is complicated effectively to overcome amorphous paper tinsel band intermediate layer alloy preparation technology; Cost is high, and utilization rate is low, particularly is difficult to the shortcoming in the intermediate layer of cutting suitable shape for profiled-cross-section pipeline and large-diameter pipeline; Compare with adopting amorphous paper tinsel band alloy to prepare the intermediate layer, microplasma spraying self-fluxing alloyed powder provided by the invention prepares the method in intermediate layer, has easy and simple to handle, characteristic of strong applicability, can save the high alloy intermediate layer material, is convenient to promote the use of.
The specific embodiment:
Below in conjunction with embodiment the present invention is done further detailed description.
Embodiment 1:
External diameter does
φ63.5mm, wall thickness is T91 (9Cr-1MoVNb)/T91 steel pipe of 5mm, the processing step for preparing the intermediate layer alloy at its end face microplasma spraying is:
The first step, to the heat resisting pipe linkage interface, promptly end face carries out turning or cutting, make the steel pipe end face straight and with conduit axis to be 90 ° of angles vertical;
Before second step, the spraying heat resisting pipe linkage interface is carried out preliminary treatment: be meant to the steel pipe end face that with alcohol or acetone oil removing sandblast roughening processing is carried out on surface to be sprayed, make it to expose the metal surface of clean roughening;
The 3rd step, employing microplasma spraying method spray the intermediate layer to a side of heat resisting pipe linkage interface, and it is spherical NiCrFeBSi nickel base self-fluxing alloy powder that the intermediate layer spray coating alloy uses material, particle size range 45～15 μ m; Its composition is by percentage to the quality: chromium Cr 10.0% wt, iron Fe 8.0%wt, boron 2.2%wt; Silicon Si 2.5%wt; Carbon C 0.15% wt, cobalt Co10%wt, surplus is a nickel;
The 4th step, employing argon gas are as plasma gas and powder feeding gas, and its technological parameter is: spray voltage 34V, spraying current 40A; Spray distance 40mm, argon flow amount 1.4L/min, deposition beam spot diameter, 4mm; The intermediate layer thickness 60 μ m that obtain; Carry out instantaneous Liquid Phase Diffusion then immediately and connect, owing to adopt argon gas (inert gas) as plasma gas and powder feeding gas, described intermediate layer alloying component is consistent with NiCrFeBSi nickel base self-fluxing alloy powder composition.
Embodiment 2:
External diameter does
φ63.5mm, wall thickness is T91 (9Cr-1MoVNb)/102 steel pipe of 5mm, the processing step for preparing the intermediate layer alloy at its end face microplasma spraying does;
The first step, to the heat resisting pipe linkage interface, promptly end face carries out turning or cutting, make the steel pipe end face straight and with conduit axis to be 90 ° of angles vertical;
Before second step, the spraying heat resisting pipe linkage interface is carried out preliminary treatment: be meant to the steel pipe end face that with alcohol or acetone oil removing sandblast roughening processing is carried out on surface to be sprayed, make it to expose the metal surface of clean roughening;
The 3rd step, employing microplasma spraying method spray the intermediate layer to a side of steel pipe linkage interface, and it is spherical NiCrFeBSi nickel base self-fluxing alloy powder that the intermediate layer spray coating alloy uses material, particle size range 45～15 μ m; Its composition is by percentage to the quality: chromium Cr 8.0% wt, iron Fe 12.0%wt, boron 3.0%wt; Silicon Si 3.5%wt; Carbon C 0.25% wt, cobalt Co10%wt, surplus is a nickel;
The 4th step, employing argon gas are as plasma gas and powder feeding gas, and its technological parameter is: spray voltage 35V, spraying current 45A; Spray distance 50mm, argon flow amount 1.7L/min, deposition beam spot diameter, 5mm; The intermediate layer thickness 65 μ m that obtain; Carry out instantaneous Liquid Phase Diffusion then immediately and connect, owing to adopt argon gas (inert gas) as plasma gas and powder feeding gas, described intermediate layer alloying component is consistent with NiCrFeBSi self-fluxing alloyed powder composition.
Embodiment 3:
External diameter does
φ63.5mm, wall thickness is T91 (9Cr-1MoVNb)/12Cr2MoWVTiB steel pipe of 5mm, the processing step for preparing the intermediate layer alloy at its end face microplasma spraying is:
The first step, to the heat resisting pipe linkage interface, promptly end face carries out turning or cutting, make the steel pipe end face straight and with conduit axis to be 90 ° of angles vertical;
Before second step, the spraying heat resisting pipe linkage interface is carried out preliminary treatment: be meant to the steel pipe end face that with alcohol or acetone oil removing sandblast roughening processing is carried out on surface to be sprayed, make it to expose the metal surface of clean roughening;
The 3rd step, employing microplasma spraying method spray the intermediate layer to a side of heat resisting pipe linkage interface, and it is spherical NiCrFeBSi nickel base self-fluxing alloy powder that the intermediate layer spray coating alloy uses material, particle size range 45～15 μ m; Its composition is by percentage to the quality: chromium Cr 6.0% wt, iron Fe 10.0%wt, boron 3.5%wt; Silicon Si 4.0%wt; Carbon C 0.35% wt, cobalt Co 10%wt, surplus is a nickel;
The 4th step, employing argon gas are as plasma gas and powder feeding gas, and its technological parameter is: spray voltage 36V, spraying current 50A; Spray distance 60mm, argon flow amount 2.0L/min, deposition beam spot diameter, 6mm; The intermediate layer thickness 70 μ m that obtain; Carry out instantaneous Liquid Phase Diffusion then immediately and connect, owing to adopt argon gas (inert gas) as plasma gas and powder feeding gas, described intermediate layer alloying component is consistent with NiCrFeBSi nickel base self-fluxing alloy powder composition.
In sum, the present invention is not only applicable to the preparation of regular shape heat resisting pipe intermediate layer alloy, is used for the preparation of profiled-cross-section heat resisting steel pipeline and large-diameter pipeline intermediate layer alloy, and advantage is more remarkable; Enforcement of the present invention can be used for the instantaneous Liquid Phase Diffusion connection of heat resisting pipe and can obtain the high jointing of bond strength quickly and easily in heat resisting pipe welding end surface spraying preparation NiCrFeBSi ni-based self-fluxing alloy intermediate layer; Also can be used for the preparation that the instantaneous Liquid Phase Diffusion of other material steel pipe connects the intermediate layer alloy.
Claims (5)
1. the instantaneous Liquid Phase Diffusion of a heat resisting pipe connects the preparation method of intermediate layer alloy, it is characterized in that this method may further comprise the steps:
The first step, to the heat resisting pipe linkage interface, promptly end face carries out turning or cutting, make the steel pipe end face straight and with conduit axis to be 90 ° of angles vertical;
Before second step, the spraying heat resisting pipe linkage interface is carried out preliminary treatment: be meant to the steel pipe end face that with alcohol or acetone oil removing sandblast roughening processing is carried out on surface to be sprayed, make it to expose the metal surface of clean roughening;
The 3rd step, employing microplasma spraying method spray the intermediate layer to a side of heat resisting pipe linkage interface, and it is spherical NiCrFeBSi nickel base self-fluxing alloy powder that the intermediate layer spray coating alloy uses material, particle size range 45～15 μ m; Its composition is by percentage to the quality: chromium Cr 0～16%, iron Fe 6～14%wt, boron 1.5～3.5%wt; Silicon Si 2.5～4.0%wt; Carbon C 0.1～0.8%wt, cobalt Co 10%wt, surplus is a nickel;
The 4th step, employing argon gas are as plasma gas and powder feeding gas; Its technological parameter is: spray voltage 32V～38V, spraying current 20A～65A, spray distance 30～120mm; Argon flow amount 0.8～3.0L/min; Deposition beam spot diameter, 3mm～10mm, the intermediate layer thickness 50 μ m～100 μ m of acquisition carry out instantaneous Liquid Phase Diffusion then immediately and connect.
2. the instantaneous Liquid Phase Diffusion of a kind of heat resisting pipe according to claim 1 connects the preparation method of intermediate layer alloy, it is characterized in that: it is spherical NiCrFeBSi nickel base self-fluxing alloy powder that the intermediate layer spray coating alloy in the step 3 uses material, particle size range 45～15 μ m; Its composition is by percentage to the quality: chromium Cr 10.0% wt, iron Fe 8.0%wt, boron 2.2%wt; Silicon Si 2.5%wt; Carbon C 0.15% wt, cobalt Co10%wt, surplus is a nickel.
3. the instantaneous Liquid Phase Diffusion of a kind of heat resisting pipe according to claim 1 connects the preparation method of intermediate layer alloy, it is characterized in that: it is spherical NiCrFeBSi nickel base self-fluxing alloy powder that the intermediate layer spray coating alloy in the step 3 uses material, particle size range 45～15 μ m; Its composition is by percentage to the quality: chromium Cr 8.0% wt, iron Fe 12.0%wt, boron 3.0%wt; Silicon Si 3.5%wt; Carbon C 0.25% wt, cobalt Co10%wt, surplus is a nickel.
4. the instantaneous Liquid Phase Diffusion of a kind of heat resisting pipe according to claim 1 connects the preparation method of intermediate layer alloy, it is characterized in that: it is spherical NiCrFeBSi nickel base self-fluxing alloy powder that the intermediate layer spray coating alloy in the step 3 uses material, particle size range 45～15 μ m; Its composition is by percentage to the quality: chromium Cr 6.0% wt, iron Fe 10.0%wt, boron 3.5%wt; Silicon Si 4.0%wt; Carbon C 0.35% wt, cobalt Co 10%wt, surplus is a nickel.
5. the instantaneous Liquid Phase Diffusion of a kind of heat resisting pipe according to claim 1 connects the preparation method of intermediate layer alloy; It is characterized in that: the technological parameter described in the step 4 is: spray voltage 34V～36V; Spraying current 35A-50A, spray distance 40～100mm, argon flow amount 1.0～2.5L/min; Deposition beam spot diameter, 4mm～8mm, the intermediate layer thickness 60 μ m～90 μ m of acquisition.
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| CN102436855B (en) * | 2011-09-29 | 2014-04-02 | 东方电气集团东方汽轮机有限公司 | Anticorrosion coating layer on surface of coil chamber of nuclear control bar driving device and preparation method thereof |
| CN105177568B (en) * | 2015-10-13 | 2018-04-06 | 四川科力特硬质合金股份有限公司 | Hot melt knot other carbide solid solution alloy coatings of tungsten carbide and preparation method thereof |
| CN109048034B (en) * | 2018-08-24 | 2020-11-20 | 江苏大学 | Device and method for laser shock welding of metal foil plate with automatic middle layer spraying function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88105479A (en) * | 1988-02-06 | 1988-09-28 | 上海新华无线电厂 | Brazing method of sleeve joint of aluminium and copper conduits |
| EP0638530A1 (en) * | 1993-08-13 | 1995-02-15 | Nec Corporation | Method of bonding graphite to metal |
| CN1397401A (en) * | 2002-08-16 | 2003-02-19 | 武汉锅炉股份有限公司 | Arc preheating method for automatic butt welding of T91 pipes |
| CN1445046A (en) * | 2003-04-28 | 2003-10-01 | 西安交通大学 | Phase change-diffusion brass solder technique |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08276282A (en) * | 1995-04-05 | 1996-10-22 | Mitsubishi Heavy Ind Ltd | Joining method of steel boiler tube |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88105479A (en) * | 1988-02-06 | 1988-09-28 | 上海新华无线电厂 | Brazing method of sleeve joint of aluminium and copper conduits |
| EP0638530A1 (en) * | 1993-08-13 | 1995-02-15 | Nec Corporation | Method of bonding graphite to metal |
| CN1397401A (en) * | 2002-08-16 | 2003-02-19 | 武汉锅炉股份有限公司 | Arc preheating method for automatic butt welding of T91 pipes |
| CN1445046A (en) * | 2003-04-28 | 2003-10-01 | 西安交通大学 | Phase change-diffusion brass solder technique |
Non-Patent Citations (1)
| Title |
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| JP特开平8-276282A 1996.10.22 |
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