CN102500886A - High-strength nickel-iron-chromium alloy and chromium-nickel stainless steel plate welding method and application to preparation of polysilicon cold hydrogenation reactors - Google Patents
High-strength nickel-iron-chromium alloy and chromium-nickel stainless steel plate welding method and application to preparation of polysilicon cold hydrogenation reactors Download PDFInfo
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Abstract
A high-strength nickel-iron-chromium alloy and chromium-nickel stainless steel plate welding method includes steps that welding parts of a welding joint are cleared, polished and cleaned; a main weld groove structure is a symmetric U-shaped weld groove, a groove root R is larger than or equal to 8mm, a single-groove angle beta is larger than or equal to 14 degrees, the dimension of a root face ranges from 1mm to 2mm; and argon tungsten-arc welding is carried out at first, two to three layers of welding strips are respectively filled in each groove by means of positive and negative welding, and filaments are filled in the grooves to cover surfaces of the grooves by means of submerged arc welding. The high-strength nickel-iron-chromium alloy and chromium-nickel stainless steel plate welding method is applied to preparation of polysilicon cold hydrogenation reactors, and cost of raw materials can be reduced on the basis of guaranteeing the quality of the reactors.
Description
Technical field
The present invention relates to the welding method of high-strength resisto and chromium nickel stainless steel plate.
Background technology
High-strength resisto such as NS111/N08800/Incoloy800/Cr20Ni32AlTi etc. are better performances in the corrosion resistant alloy, and cost and price is higher, the non-oxidizability dielectric corrosion, and anti-carburizing is good under the high temperature.Heat exchanger and the steam generator etc. done commonly used.Typical in N08800 and Incoloy 800H.This material has the ability of better non-oxidizability medium, and is corrosion-resistant, and the impervious carbon calorific intensity of high temperature resistance is high, has good mechanical performance and corrosion resistance, processing characteristics and welding performance, is the anti-comprehensive corrosive nature alloy preferably with extensive use.Anti-steam, soft water, steam-air-CO3 mixture, various acid solutions, salt, H2S corrosion.And the low chromium nickel stainless steel of relative cost, typical as 0Cr17Ni12Mo2 also have big purposes, and prior art does not have makes manufacturability report to the welding of above two kinds of alloy sheets.
The material of cold hydrogenation reactor select main consideration resistance to elevated temperatures for use, higher relatively as the middle and lower part temperature in key reaction district, select the N08800 material for use, get 825 ℃ of the N08800 serviceability temperature upper limits according to ASME II-D, satisfy the instructions for use of this section temperature.Its composition is between stainless steel and nickel-base alloy; Its nickel content is in and neither occurs transcrystalline under the high-temperature and high-pressure conditions; Do not produce the scope of intergranular stress corrosion again; And material has high strength, and the performance of resistance to high temperature oxidation and creep and good anti-homogeneous corrosion and chloride stress cracking corrosive nature are used widely in the polysilicon project.N08800 series material welding characteristic shows that nickel content is high in the N08800 series material composition, and it has the following characteristic that is different from stainless steel and has a strong impact on welding quality:
1) welding pool metal flow property is poor
2) the welding arc penetrance is low, and fusion penetration is little
3) welding point is prone to produce fire check, defectives such as Stress Release crackle and pore
4) metal surface forms fine and close oxide-film and avoids further oxidation in the use.
Summary of the invention
The present invention seeks to: the welding method that proposes a kind of high-strength resisto and chromium nickel stainless steel plate; Especially the welding method of heavy wall N08800 and chromium nickel stainless steel plate, and utilize the meet the requirements cold hydrogenation reactor of harsh polysilicon industry of the inventive method preparation.
The object of the invention also is: guaranteeing to reduce the filling metal on the welding fusion good basis, reduce welding stress.
Technical scheme of the present invention is: the welding method of high-strength resisto and chromium nickel stainless steel plate the steps include:
Welding point welding place is cleared up, is polished, (solvent) cleaning; Main body weld groove structure adopts symmetrical U-shaped groove, groove root R >=8mm, and groove Sidewall angles (like single bevel angle) β >=14 °: root face is 1mm-2mm, can bottom gap be located at about 3mm-4mm;
Employing argon tungsten-arc welding bottoming, positive and negative high nickel chromium triangle welding rod is filled each layer 2-3, when adopting the welding rod welding again; The groove middle part is filled and is not swung; Small size little swing during the bevelled edge welding, the short stay at the weld groove place is in case the welding bead quilt " undercut " or the situation that welding slag is doped appears; Capping is filled in the filament submerged-arc welding of high nichrome, adopts multi-pass welding during welding; The little electric current of filament, weldering fast, and press the road welding between layer road.
It is the welding of 0Cr17Ni12Mo2 and N08800 plate that typical case's hydrogenation reactor apparatus is made key issue, and the welding of 0Cr17Ni12Mo2 stainless steel is relatively easy, and welding metal filled thickness in key-course road and interlayer temperature can guarantee quality of weld joint.The N08800 series material belongs to iron nickel high temperature alloy, and the welding method of nickel alloy and the welding method of austenitic stainless steel have necessarily similar.And this material has the more stainless characteristic that is different from, and the technology that requires in the processing welding process is different from common stainless steel.The equipment that the present invention relates to belongs to the polysilicon nucleus equipment, and wherein the 0Cr17Ni12Mo2 material thickness is 30-60mm, and the N08800 material thickness is 30-60mm, and the N08800 processing welding requirements partly that improves this equipment is very important.
The bevel for welding manufacturing process is; Adopt lathe that sheet material is carried out force plane; Treat that changing cutter again when bevel angle and R arc size are shaped substantially carries out adjustable cast iron planes one time to the surface, carry out local polishing with polishing machine at last, carry out angle and the measurement of R arc after the detection of process roughmeter is qualified.
Groove cleaning cleaning is: before the welding with groove and near clear up with acetone, thoroughly remove greasy dirt and dust; At the argon gas more than 99.99%, reverse side leads to argon shield earlier to backing welding during welding with purity.
After welding is accomplished surface quality is checked once more, carried out Non-Destructive Testing after qualified; Select little electric current, short arc and slower speed of welding in the welding for use; Per minute is less than 15 centimetres; In the backing welding process, the welding wire fire end must be among the argon shield, wants strict control interlayer temperature during the multilayer welding; Must not be higher than 100 ℃, when receiving arc arc crater filled up or draw arc crater and avoid crater crack.
The method of eliminating the welding solidification cracking is: carefully clear up the oxide skin and the dirt on weldment surface, sneak into welding pool in order to avoid contain the impurity of S, P, Pb element.
Avoid producing the method for H2O pore and CO pore during welding: do not remove the groove of workpiece and near oils and dirt clean.
The operating position of typical case's hydrogenation reactor apparatus; The top of cold hydrogenation reactor (entire equipment height about 1/3) medium is mainly gas and the unstrpped gas that reaction produces; Because the space increases; Temperature decreases than lower middle portion, and extent of corrosion is also lower, material selection 06Cr17Ni12Mo2.The bottom is divided into conversion zone, and serviceability temperature is high, material selection N08800.The 0Cr17Ni12Mo2 material thickness is 60mm in the cold hydrogenation reactor structure of typical case, 560 ℃-580 ℃ of serviceability temperatures; The N08800 material thickness is 45mm, 580 ℃-600 ℃ of serviceability temperatures.
Beneficial effect of the present invention is: proposed the realization of the welding method of high-strength resisto and chromium nickel stainless steel plate, can be used for the welding of heavy wall N08800, be used for the works very well of preparation of the hydrogenation reactor of polysilicon neck industry.The present invention adopts U type groove, and is littler than the A/F of double V-groove, so the fusion welding metal loading is little, melting welding efficient is high.U type groove side slope oblique angle is unsuitable too small, and scarfing cinder is easy.Technology of the present invention has well solved following problem: stainless steel and nickel alloy are along with plate thickness increases; Shape difficulty; The tendency that welding point produces defective becomes and has solved greatly, also that welding pool metal flow property is poor, the welding arc penetrance is low and fusion penetration is little, welding point is prone to produce fire check, the problem of defectives such as Stress Release crackle and pore, root fillet and groove Sidewall angles that the present invention's employing is bigger; The characteristic that adapts to nickel alloy molten bath molten metal flow property difference; Guaranteeing to reduce the filling metal on the welding fusion good basis, reduce welding stress.
Description of drawings
Fig. 1 is the structural representation of the cold hydrogenation reactor of the present invention,
Fig. 2 is a welding method sketch map of the present invention
The specific embodiment
The N08800 series material belongs to iron nickel high temperature alloy, and the welding method of this alloy and the welding method of austenitic stainless steel have necessarily similar.And this material has the more stainless characteristic that is different from, and the technology that requires in the processing welding process is different from common stainless steel.The equipment that the present invention uses relates to the nucleus equipment that belongs to the polysilicon hydrogen metallization processes, guarantees that the N08800 processing welding quality partly of this equipment is very important.
1, main welding method is:
1) prevent surface oxidation: the fusing point of the oxide that material surface forms is higher than the fusing point of N08800 alloy far away.If have these oxide-films in the welding process welding point, can cause welding point to have defectives such as lack of fusion or oxide-film are mingled with.
2) prevent that the element that can cause embrittlement from getting into the molten bath: nickel is prone to and sulphur (S), plumbous (Ph), phosphorus (P) and zinc easy formation low melting point eutectics such as (Zn), produces fire check.Welding point is carefully cleared up, cleaning.
3) technique for welding measure: a) main body weld groove structure adopts symmetrical double-U groove 1,3, the big single face angle β of root R >=8mm, groove, and single bevel angle β >=15 °: root face approximately is 1mm-2mm, (bottom gap is greatly about 3mm-4mm).This double-U-shaped divided edge structure has avoided the nickel alloy welding to produce defective; Double-U-shaped groove and the technology that adopts little welding wire to weld automatically in welding through implementing to regulate technological measures such as welding torch position and inclination angle, guarantee the welding point fusion well, have significantly improved welding efficiency simultaneously.
B) adopt the argon tungsten-arc welding bottoming, each layer 2-3 is filled in positive and negative weldering, adopts SMAW and filament submerged-arc welding to fill capping again.
C) should the input of strict control heat in the welding process, during welding in 2,4 districts the employing multi-pass welding.During the welding rod welding, little electric current, weldering fast, the groove middle part is filled and is not swung.Small size little swing during the bevelled edge welding, the short stay at the weld groove place is in case the welding bead quilt " undercut " or the situation that welding slag is doped appears.Submerged-arc welding, the little electric current of filament, the road welding is pressed in weldering fast between layer road.
Welding parameter:
2, the ancillary method in the welding processing operating process:
1) the equipment bevel for welding is shaped and adopts lathe that sheet material is carried out force plane; Treat that changing cutter again when bevel angle and R arc size are shaped substantially carries out adjustable cast iron planes one time to the surface; Carry out local polishing with polishing machine at last, carry out angle and the measurement of R arc after the detection of process roughmeter is qualified and carry out record.Groove face need carry out 100% infiltration detection before the welding, has checked flawless;
2) welding front connector groove face and near 100mm scope, with the polishing wheel polishing, acetone is removed greasy dirt.The reconditioning cleaning is clean between road, welding process middle level;
3) filler pass in the welding process, hammering is welded again;
4) positive and negative symmetrical welding in the welding process;
5) argon arc welding bottoming back-protective (shields the molten bath among the protection air-flow to greatest extent; And to stay the hot junction of welding wire in the protection air-flow all the time);
Arc crater filled up when 6) welding rod welded current interruption, and every weldering one root bead bar, arc crater carry out can welding next root bead bar after the reconditioning;
7) be preferably in the back side water-cooled of welding zone in the welding process, the control interlayer temperature is below 100 ℃;
8) weld shape keeps dimpling for every layer.Adapter is the dimpling weld seam with housing angle welding leg;
9) welding material is prepared.
Welding material adopts rich NiCr wlding, uses the import wlding,, can on product, use after qualified by batch welding checking the import welding material.The tungsten argon arc welding wire adopts ERNiCr-3, and welding rod adopts ENiCrFe-2, welding SAW materials ERNiCr-3 (NT100).
3, other requirement of welding:
1) equipment cold forming and argon arc welding welding should be delimited relatively-stationary special zone, and the welding of parts must be carried out in appointed area, clean place;
2) must keep clean in the special fabrication region, except that the required parts of each equipment making, forbid to place foreign material or the processing of polishing.Parts of stainless steel should be put with the carbon steel isolation, prevents that greasy dirt, metal powder and iron ion from polluting, and uses the Polypropylence Sheet covering protection, and the material bottom is supported with plank.
3) inner surface of end socket, cylindrical shell is wanted the pad pasting protection.Riveting, weldering producer should dress clean work clothes and gloves, make in the access device or welding, must wear clean soft shoes.
4, welding point inspection
Bigger these situation that waits of the tendency of heavy wall equipment and material production defective have determined must strengthen inspection in the welding process, guarantee the equipment welding quality.
4.1 visual examination of weld
After every layer of per pass weld seam welding accomplished, carry out the weld appearance visual examination, in time find and the processing welding lines blemish.In case of necessity detection is permeated on the welding bead surface.
4.2 the inherent inspection of weld seam
Carry out Non-Destructive Testing after the weld seam welding, adopt the high-quality film.Do not increase middle Non-Destructive Testing to accomplishing weld seam in case of necessity, guarantee the weld seam welding quality.
1) detection method of A, category-B weld seam:
Carry out 100%PT behind the argon arc welding backing welding, SMAW is filled a half RT of positive and negative groove, carries out 100%UT/RT/PT once more after welding is accomplished and rechecks
2) detection method of C, D weld seam:
Carry out 100%PT behind the argon arc welding backing welding, carry out 100%UT/PT after welding is accomplished and recheck
4.3 the detection that hydraulic pressure is later
All weld seams carry out UT/PT to be rechecked, and mother metal surface local PT rechecks
5, welding procedure embodiment further:
Groove cleaning, before the welding with groove and near clear up with acetone, thoroughly remove dusts such as greasy dirt; At the argon gas more than 99.99%, can guarantee complete penetraction and fusion in welding, and stop oxidation during welding by the earlier logical argon shield of reverse side with purity for backing welding; Select little electric current, short arc and slower speed of welding in the operation for use; Per minute is less than 15 centimetres; In the backing welding process, the welding wire fire end must be among the argon shield, wants strict control interlayer temperature during the multilayer welding; Must not be higher than 100 ℃, when receiving arc arc crater filled up or draw arc crater and avoid crater crack.Before the weldering wlding material requistion is examined the requirement of guaranteeing to meet welding procedure.Inspection secondary storehouse wlding toasts record, writes down the baking record of each lot number.The welder is ready to the welding procedure inspector and according to the requirement of welding procedure welder's actual welding parameter is carried out record, strict control welding current, interlayer temperature and weld seam cooling.Weld seam is received the arc place and is carried out appearance test, and each road of interlayer has welded the receipts acnode and staggered as far as possible.After accomplishing, every layer of welding should check whether defectiveness of surface, if any removing totally weldering again.Interlayer needs to remove oxide on surface and welding slag with emery wheel, and cleans out with acetone again and to weld.After welding is accomplished surface quality is checked once more, carried out Non-Destructive Testing after qualified.
For improving the quality of Non-Destructive Testing, check weldquality better.During detecting, this selects ACFA C4 egative film, because this egative film has breakthrough emulsion to strengthen the contrast and the definition of details.Even the most small details is all high-visible and easy judge.Find tiny defect better through comparison check.
6, device assembles welding
Do not allow powerful assembling to cause the differential hardening of weldment, the butt weld unfitness of butt joint should increase the requirement of unfitness of butt joint according to 6.2.3.2 table 6-1 control among the JB/T4756-2006 to the category-A weld seam.Cylinder roundness should be carried out according to the requirement of JB/T4756-2006, should be controlled at 5mm for thick-walled vessel, to reduce the misalignment of circumferential weld.Should notice checking that angle welding groove compact dimensions and removing surface situation, surface must not have the foreign material of influence welding such as greasy dirt, oxide when taking over, carry out dyeing inspection at last, confirm that the employing of qualified back welds with the cylindrical shell assembling.Take over gradient must not surpass flange outer diameter 1% and be not more than 3mm.The location dimension control of miscellaneous part is with reference to the requirement of HG20584.
The making of having accomplished this reactor is controlled in strictness through above operation, meets the requirement of " fixed pressure vessel supervision rules ", JB/T4756-2002 " nickel and nickel alloy pressing pressure container ".Through professional testing agency in-site measurement, and witness pressure test, compare with the standard-required parameter value, meet standard code, pressure test is passed through, conclusion is qualified.
Claims (10)
1. the welding method of high-strength resisto and chromium nickel stainless steel plate, it is characterized in that step is: welding point welding place is cleared up, polishes, is cleaned; Main body weld groove structure adopts symmetrical U-shaped groove, groove root R >=8mm, and single bevel angle β >=14 °: root face is 1mm-2mm; Employing argon tungsten-arc welding bottoming, each layer 2-3 is filled in positive and negative weldering, adopts filament submerged-arc welding to fill capping again.
2. the welding method of high-strength resisto according to claim 1 and chromium nickel stainless steel plate is characterized in that step is: when welding rod welds in the welding process, and little electric current, weldering fast, the groove middle part is filled and is not swung.Small size little swing during the bevelled edge welding, the short stay at the weld groove place.
3. the welding method of high-strength resisto according to claim 1 and chromium nickel stainless steel plate is characterized in that pressing between layer road the road welding.
4. according to the welding method of described high-strength resisto of one of claim 1 to 3 and chromium nickel stainless steel plate, it is characterized in that the welding of 0Cr17Ni12Mo2 and N08800 plate, the 0Cr17Ni12Mo2 material thickness is 30-60mm, and the N08800 material thickness is 30-60mm.
5. according to the welding method of described high-strength resisto of one of claim 1 to 3 and chromium nickel stainless steel plate; It is characterized in that the bevel for welding manufacturing process is; Adopt lathe that sheet material is carried out force plane; Treat that changing cutter again when bevel angle and R arc size are shaped substantially carries out adjustable cast iron planes one time to the surface, carry out local polishing with polishing machine at last, carry out angle and the measurement of R arc after the detection of process roughmeter is qualified.
6. according to the welding method of described high-strength resisto of one of claim 1 to 3 and chromium nickel stainless steel plate, it is characterized in that groove cleaning cleaning is: before the welding with groove and near clear up with acetone, thoroughly remove greasy dirt and dust; At the argon gas more than 99.99%, reverse side leads to argon shield earlier to backing welding during welding with purity.
7. according to the welding method of described high-strength resisto of one of claim 1 to 3 and chromium nickel stainless steel plate, it is characterized in that after welding is accomplished surface quality being checked once more, carry out Non-Destructive Testing after qualified; Select little electric current, short arc and slower speed of welding in the welding for use; Per minute is less than 15 centimetres; In the backing welding process, the welding wire fire end must be among the argon shield, wants strict control interlayer temperature during the multilayer welding; Must not be higher than 100 ℃, when receiving arc arc crater filled up or draw arc crater and avoid crater crack.
8. according to the welding method of described high-strength resisto of one of claim 1 to 3 and chromium nickel stainless steel plate; It is characterized in that the method for eliminating the welding solidification cracking is: carefully clear up the oxide skin and the dirt on weldment surface, sneak into welding pool in order to avoid contain the impurity of S, P, Pb element.
9. according to the welding method of described high-strength resisto of one of claim 1 to 3 and chromium nickel stainless steel plate, avoid producing the method for H2O pore and CO pore when it is characterized in that welding: do not remove the groove of workpiece and near oils and dirt clean.
10. the application that is welded on the cold hydrogenation reactor of preparation of high-strength resisto and chromium nickel stainless steel plate; The top cone of cold hydrogenation reactor; Account for 1/3 of entire equipment height; The thick 06Cr17Ni12Mo2 of material selection 60mm welds with the N08800 material of bottom tower body, and the thickness of bottom composition of tower shell material is 45mm.
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Cited By (4)
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| CN104646801A (en) * | 2014-12-30 | 2015-05-27 | 上海锅炉厂有限公司 | Welding process of GH984G high temperature nickel-iron based alloy |
| CN104722896A (en) * | 2015-03-16 | 2015-06-24 | 鲁西工业装备有限公司 | Automatic submerged arc welding method of nickel base alloy |
| CN112191999A (en) * | 2020-09-21 | 2021-01-08 | 东方电气集团东方锅炉股份有限公司 | Fillet weld structure of nickel-based small pipe and alloy steel header and welding process |
| CN114951919A (en) * | 2022-05-17 | 2022-08-30 | 华能甘肃西固热电有限公司 | Welding method of hastelloy C276 and 316L stainless steel |
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Cited By (4)
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| CN112191999A (en) * | 2020-09-21 | 2021-01-08 | 东方电气集团东方锅炉股份有限公司 | Fillet weld structure of nickel-based small pipe and alloy steel header and welding process |
| CN114951919A (en) * | 2022-05-17 | 2022-08-30 | 华能甘肃西固热电有限公司 | Welding method of hastelloy C276 and 316L stainless steel |
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Address after: 211100, No. 199, Guang Li Road, Gu Jie street, Jiangning District, Jiangsu, Nanjing Applicant after: Nanjing Duble Metal Equipment Engineering Co., Ltd. Address before: 211100, No. 199, Guang Li Road, Gu Jie street, Jiangning District, Jiangsu, Nanjing Applicant before: Nanjing Duble Metal Equipment Engineering Co.,Ltd. |
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Application publication date: 20120620 |