CN104070271A - Dissimilar steel welding method of 15 Cr1Mo1V valve body and WB 36 piping - Google Patents
Dissimilar steel welding method of 15 Cr1Mo1V valve body and WB 36 piping Download PDFInfo
- Publication number
- CN104070271A CN104070271A CN201410309778.0A CN201410309778A CN104070271A CN 104070271 A CN104070271 A CN 104070271A CN 201410309778 A CN201410309778 A CN 201410309778A CN 104070271 A CN104070271 A CN 104070271A
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- welding
- valve body
- steel
- 15cr1mo1v
- pipe arrangement
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to metal machining process, particular to a dissimilar steel welding method of a 15Cr1Mo1V valve body and WB 36 piping. According to the dissimilar steel welding method of the 15Cr1Mo1V valve body and the WB 36 piping, dissimilar steel butt welding is performed on the 15Cr1Mo1V inlet of the valve body and the WB 36 piping, the problem of poor welding performance is solved, core technology during the welding process can be mastered, characteristic process specifications are formed and considerable economic benefits are obtained. The dissimilar steel welding method of the 15Cr1Mo1V valve body and the WB 36 piping has the advantages that the 15Cr1Mo1V valve body, the WB 36 piping and welding materials with welding wire TIG-R31 primed and R317 welding rod covered are integrally welded; functions of coal consumption reduction, heat efficiency improvement, reliable machine unit operation and continuously improved economic benefits can be achieved due to the fact the piping is added to the valve; process problem of poor welding performance of dissimilar steel can be solved and core technology during the welding process can be mastered.
Description
Technical field
The present invention relates to metal working process, concrete is a kind of 15Cr1Mo1V valve body and WB36 pipe arrangement dissimilar steel welding method.
Background technology
Along with the development of China's thermoelectricity cause, the utilization of super (super-) critical fired power generating unit is more and more, and WB36 material plays an important role with its excellent performance.Valve inlet adds a pipe arrangement, plays the effect of saving the energy.
The solderability of 15Cr1Mo1V steel is poor, easily produces cold crack in welding process, and the tendency of delayed crack is also very large.
WB36 heat-resisting steel material alloy total amount is high, and heat conductivility and welding performance are poor, easily occurs crackle, thus must preheating before the weldering of this steel and postwelding must heat treatment just can reach requirement.
In the process of 15Cr1Mo1V valve body and the butt welding of WB36 pipe arrangement dissimilar steel, exist qualification rate low, postwelding crackle and the higher problem of the time delay crackle frequency.Solution is to do welding process performance test, studies, and grasps the key technology in welding process, updates, and puts the axe in the helve.
Summary of the invention
In order to address the above problem, the present invention proposes a kind of 15Cr1Mo1V valve body and WB36 pipe arrangement dissimilar steel welding method, valve body 15Cr1Mo1V import and WB36 pipe arrangement carry out dissimilar steel butt welding, solve the poor technological problems of welding performance, grasp the core technology in welding process, formation has the technological specification of own characteristic, obtains considerable economic benefit.
In order to reach foregoing invention object, the present invention proposes following scheme:
15Cr1Mo1V valve body and WB36 pipe arrangement dissimilar steel welding method, be specifically following steps:
The first step: the material of confirming valve body is 15Cr1Mo1V steel;
Second step: the material of confirming the WB36 pipe arrangement supporting with valve body belongs to Ni-Cu-Mo low-alloy steel;
The 3rd step: selecting welding wire model is TIG-R31; The diameter of selecting welding rod model R317 and welding rod is Ф 4;
The 4th step: cure welding rod:
R317 welding rod: baking and banking up with earth temperature is 300 ℃-350 ℃, and the time of curing is 1.5h;
The 5th step: adopt the pre-heated work pieces in heating tape, valve body preheat temperature is 300 ℃-400 ℃, preheating time 2h, pipe arrangement preheat temperature is 100 ℃-150 ℃, preheating 2 hours;
The 6th step: welding:
(a) weldering TIG-R31:
First with welding wire TIG-R31, by valve body, spot welding is connected with pipe arrangement, then proofreaies and correct valve body and pipe arrangement position, finally with welding rod TIG-R31, carries out backing welding; Welding current 60-90A;
(b) weldering R317:
With the cover welding of R317 welding rod, 250 ℃-350 ℃ of interlayer temperatures, welding current 140-160A;
The 7th step: post weld heat treatment adopts tempering process, and temperature is 740 ℃ ± 10 ℃, insulation 3h;
The 8th step: welding position is carried out to radiographic inspection.
It is according to the standard implementation of GB3323 < < steel weld seam radiography and egative film grade separation method > > that welding position is carried out to radiographic inspection.
Advantage of the present invention is: valve body material: 15Cr1Mo1V; Pipe arrangement material: WB36; Welding material: welding wire TIG-R31 bottoming, R317 capping, four kinds of materials are welded into one; Valve adds that pipe arrangement effect is: reduce coal consumption, improve the thermal efficiency, make unit operation reliable, constantly increase, increase economic efficiency; Solve the poor technological problems of dissimilar steel welding performance, grasp the core technology in welding process.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
In figure: valve body 1, pipe arrangement 2, welding position 3.
the specific embodiment
For further description manufacturing process of the present invention, and the advantage that adopts this preparation method to obtain, below in conjunction with accompanying drawing 1, further describe.
One, the key property of material:
1.15Cr1Mo1V valve body material:
(1) key property of 15Cr1Mo1V steel:
15Cr1Mo1V is the grade of steel of former Soviet Union's development, compare with 12Cr1Mo1V, steel content increases, and mean value exceeds 0.8%, it is less that vanadium content differs, mean value is low by 0.025%, and other Elements C, Mn, Si, Cr, S, the equal indifference of P, therefore 15Cr1Mo1V steel hardenability is better, thermostrength is higher, in 450 ℃ of-550 ℃ of temperature ranges, creep rupture strength, than the high about 19.6MPa of 12Cr1Mo1V, exceeds 9.8MPa in the time of 570 ℃.
(2) welding performance of 15Cr1Mo1V steel:
A.15Cr1Mo1V chemical analysis:
B.15Cr1Mo1V mechanical performance:
C.15Cr1Mo1V welding performance:
The solderability of 15Cr1Mo1V steel is poor, easily produces cold crack in welding process, and the tendency of delayed crack is also very large, so need to adopt the technological measures such as strict weld preheating, post weld heat treatment, guarantee welding quality when 15Cr1Mo1V welds.
2.WB36 pipe arrangement material:
(1) key property of WB36 steel:
WB36 is the Ni-Cu-Mo low-alloy steel that German terraced cast steel factory, Mannesmann steel mill and SUMITOMO CHEMICAL metal Co., Ltd. produce.Because WB36 steel has higher intensity and the good features such as welding performance, as heat-resisting alloy steel, list Vdtuv rules in, and be widely used as 500 ℃ of following large-scale thermo-power station pressure pipelines.
WB36 is a kind of Ni-Cu-Mo type low-alloy steel, in DIN standard, is called as 15NiCuMoNb5.In WB36, contain the alloying elements such as Ni, Cu, Nb, there is high tensile strength and yield strength.Nb crystal grain thinning, Cu reaches precipitation strength by its precipitate, and improves the corrosion resistance of steel.But Cu makes material have the element of red shortness, in steel, easily in crystal boundary enrichment, causes pattern cracking defect.In steel, add Ni, can make crystal boundary produce the higher Cu-Ni compound of fusing point, thereby eliminate the harmful effect of Cu.
(2) welding performance of WB36 steel:
1, WB36 steel chemical analysis:
2, WB36 steel mechanical performance:
(3) WB36 steel welding performance:
WB36 steel has certain cold cracking sensitivity, and the carbides such as the Cr in steel, Mo, Nb have increased the reheat cracking susceptibility of steel.WB36 heat-resisting steel material alloy total amount is high, and heat conductivility and welding performance are poor, thus must preheating before the weldering of this steel and postwelding must heat treatment just can reach requirement.
The material of 3.TIG-R31 welding wire:
(1) key property of TIG-R31 welding wire:
TIG-R31 is the Mayari tungsten argon arc welding wire containing Cr1.25 %-Mo0.5 %-V.Weld metal has good plasticity and toughness.Appearance of weld is attractive in appearance, and all-position welding is functional.Conventionally during welding, weldment needs preheating and keeps between road 250 ~ 300 ℃ of temperature, and postwelding carries out 715 ~ 745 ℃ of temper.
For welding job temperature, at boiler heating surface pipe 580 ℃ below and jet chimney 540 ℃ below and cracking of oil equipment, high temperature, synthesize the GTAW bottoming of chemical machinery (as steel such as 12Cr1MoV, T/ P11) and argon welding entirely.
(2) chemical analysis of TIG-R31 welding wire:
(3) TIG-R31 mechanical performance:
4.R317 the material of welding rod:
(1) feature of R317 welding rod:
| feature: R317 is the pearlitic heat resistant steel electrode of the Cr1%-Mo0.5%-V of low hydorgew sodium type coating, and DC reverse connection can all-position welding.Weldment should carry out suitable preheating and post weld heat treatment according to design feature. |
| purposes: for welding job temperature in the pearlite heatproof steel below 540 ℃ (as 12CrMoV) structure, as high-temperature high-pressure boiler pipeline, cracking of oil equipment, the synthetic chemical industry equipment of high temperature etc. |
(2) chemical analysis of R317 welding rod:
(3) R317 mechanical performance:
| Tensile strength (σ b) | Yield strength (σ s) | Percentage elongation (δ) |
| ≧540(MPa) | ≧440(MPa) | ≧17% |
Two, welding procedure:
(1) material:
Valve body material 15Cr1Mo1V is different from pipe arrangement WB36 material, adds welding wire TIG-R31 and welding rod R317, and totally four kinds of materials have welded.
(2) step:
First, valve body and pipe arrangement spot welding, then use welding wire TIG-R31 bottoming, finally use R317 welding rod capping, four kinds of materials weld together.
(3) technique:
A: welding rod is baked and banked up with earth:
(a) R317 welding rod:
1. bake and bank up with earth temperature: 300 ℃ of-350 ℃ of X1.5h.
2. core diameter: Ф 4
B: valve body, pipe arrangement preheating:
(1) valve body preheating: 300 ℃ of-400 ℃ of X2h.
(2) pipe arrangement preheating: 100 ℃ of-150 ℃ of X2h.
C: welding:
(a) weldering TIG-R31:
First use welding wire spot welding, then proofread and correct, last backing welding.Welding current 60-90A.
(b) weldering R317:
250 ℃-350 ℃ of interlayer temperatures, welding current 140-160A.
D: post weld heat treatment:
Temperature is 740 ℃ ± 10 ℃, insulation 3h.
Three, check:
Welding position is carried out to radiographic inspection, according to the standard implementation of GB3323 < < steel weld seam radiography and egative film grade separation method > >.
Claims (2)
1.15Cr1Mo1V valve body and WB36 pipe arrangement dissimilar steel welding method, is characterized in that following steps:
The first step: the material of confirming valve body is 15Cr1Mo1V steel;
Second step: the material of confirming the WB36 pipe arrangement supporting with valve body belongs to Ni-Cu-Mo low-alloy steel;
The 3rd step: selecting welding wire model is TIG-R31; The diameter of selecting welding rod model R317 and welding rod is Ф 4;
The 4th step: cure welding rod:
R317 welding rod: baking and banking up with earth temperature is 300 ℃-350 ℃, and the time of curing is 1.5h;
The 5th step: adopt the pre-heated work pieces in heating tape, valve body preheat temperature is 300 ℃-400 ℃, preheating time 2h, pipe arrangement preheat temperature is 100 ℃-150 ℃, preheating 2 hours;
The 6th step: welding:
Weldering TIG-R31:
First with welding wire TIG-R31, by valve body, spot welding is connected with pipe arrangement, then proofreaies and correct valve body and pipe arrangement position, finally with welding rod TIG-R31, carries out backing welding; Welding current 60-90A;
Weldering R317:
With the cover welding of R317 welding rod, 250 ℃-350 ℃ of interlayer temperatures, welding current 140-160A;
The 7th step: post weld heat treatment adopts tempering process, and temperature is 740 ℃ ± 10 ℃, insulation 3h;
The 8th step: welding position is carried out to radiographic inspection.
2. 15Cr1Mo1V valve body according to claim 1 and WB36 pipe arrangement dissimilar steel welding method, is characterized in that it is according to the standard implementation of GB3323 < < steel weld seam radiography and egative film grade separation method > > that welding position is carried out to radiographic inspection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309778.0A CN104070271B (en) | 2014-07-02 | 2014-07-02 | 15Cr1Mo1V valve body and WB36 pipe arrangement different steel weld method |
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|---|---|---|---|
| CN201410309778.0A CN104070271B (en) | 2014-07-02 | 2014-07-02 | 15Cr1Mo1V valve body and WB36 pipe arrangement different steel weld method |
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| CN104070271A true CN104070271A (en) | 2014-10-01 |
| CN104070271B CN104070271B (en) | 2016-03-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109175745A (en) * | 2018-10-17 | 2019-01-11 | 天长市海翔自控设备有限公司 | A kind of high sealing gas protection welding process for nuclear power bellows stop valve |
| CN111545942A (en) * | 2020-05-20 | 2020-08-18 | 南通市力沛流体阀业有限公司 | Dissimilar steel welding method for C12A valve body and F22 piping |
| CN114406512A (en) * | 2021-12-27 | 2022-04-29 | 中南大学 | Welding and electric pulse heat treatment process for dissimilar alloy |
| CN114473151A (en) * | 2022-01-12 | 2022-05-13 | 中南大学 | Full-automatic electric pulse joint segmented welding device and process for butt joint of different metal pipes |
| CN115213534A (en) * | 2021-04-21 | 2022-10-21 | 南通市力沛流体阀业有限公司 | F316 valve body and F11 piping dissimilar steel welding method |
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| GB580732A (en) * | 1942-11-10 | 1946-09-18 | Harold Martin | Improvements in and relating to the welding of metal studs and the like to metal plates and the like |
| CN101269432A (en) * | 2008-05-20 | 2008-09-24 | 南通市电站阀门有限公司 | Dissimilar metal welding method for WCB steel valve and WB36 steel pipeline |
| CN102873462A (en) * | 2012-10-13 | 2013-01-16 | 南通国电电站阀门有限公司 | Process for welding swing check valve and matching pipe |
| CN103286468A (en) * | 2013-06-26 | 2013-09-11 | 南通国电电站阀门有限公司 | Dissimilar steel welding process of check door and tubing |
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2014
- 2014-07-02 CN CN201410309778.0A patent/CN104070271B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB580732A (en) * | 1942-11-10 | 1946-09-18 | Harold Martin | Improvements in and relating to the welding of metal studs and the like to metal plates and the like |
| CN101269432A (en) * | 2008-05-20 | 2008-09-24 | 南通市电站阀门有限公司 | Dissimilar metal welding method for WCB steel valve and WB36 steel pipeline |
| CN102873462A (en) * | 2012-10-13 | 2013-01-16 | 南通国电电站阀门有限公司 | Process for welding swing check valve and matching pipe |
| CN103286468A (en) * | 2013-06-26 | 2013-09-11 | 南通国电电站阀门有限公司 | Dissimilar steel welding process of check door and tubing |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109175745A (en) * | 2018-10-17 | 2019-01-11 | 天长市海翔自控设备有限公司 | A kind of high sealing gas protection welding process for nuclear power bellows stop valve |
| CN111545942A (en) * | 2020-05-20 | 2020-08-18 | 南通市力沛流体阀业有限公司 | Dissimilar steel welding method for C12A valve body and F22 piping |
| CN115213534A (en) * | 2021-04-21 | 2022-10-21 | 南通市力沛流体阀业有限公司 | F316 valve body and F11 piping dissimilar steel welding method |
| CN115213534B (en) * | 2021-04-21 | 2024-05-03 | 南通市力沛流体阀业有限公司 | Welding method for dissimilar steel of F316 valve body and F11 piping |
| CN114406512A (en) * | 2021-12-27 | 2022-04-29 | 中南大学 | Welding and electric pulse heat treatment process for dissimilar alloy |
| CN114473151A (en) * | 2022-01-12 | 2022-05-13 | 中南大学 | Full-automatic electric pulse joint segmented welding device and process for butt joint of different metal pipes |
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| CN104070271B (en) | 2016-03-09 |
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Address after: 226557, Taoyuan West Road, Chengnan street, Rugao City, Jiangsu, Nantong province 1 Patentee after: Nantong State Electric Power Valve Co., Ltd. Address before: 226557, Taoyuan West Road, Taoyuan Town, Nantong City, Jiangsu, Rugao 1 Patentee before: Nantong State Electric Power Valve Co., Ltd. |
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