CN108817610A - A kind of 12Cr1MoVG path Thick Wall Tube Welding method - Google Patents
A kind of 12Cr1MoVG path Thick Wall Tube Welding method Download PDFInfo
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- CN108817610A CN108817610A CN201811045967.6A CN201811045967A CN108817610A CN 108817610 A CN108817610 A CN 108817610A CN 201811045967 A CN201811045967 A CN 201811045967A CN 108817610 A CN108817610 A CN 108817610A
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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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
- B23K9/0052—Welding of pipe panels
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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
- B23K9/16—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
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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
- B23K9/235—Preliminary treatment
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Abstract
The invention discloses a kind of 12Cr1MoVG path Thick Wall Tube Welding methods, include the following steps：Step S1, retaining wall on slope and cleaning；Step S2, weldment group pair；Step S3, positioning welding, using hand tungsten argon arc welding method positioning welding；Step S4, weld preheating；Step S5, bottom welding carries out bottom welding using the hand tungsten argon arc welding welding method of molten bath small volume, energy Relatively centralized；Step S6, interlayer temperature measurement and control；Step S7, welding electrode arc welding filling, cover welding；Step S8, postheating；Step S9, welding point cleaning and inspection.The present invention fills the combined welding method of capping by using argon tungsten-arc welding bottoming and welding electrode arc welding, cancel post weld heat treatment technical process, improve welding procedure benefit, using weld preheating, control interlayer temperature, control one-pass weld thickness and postheating technological measure, welding point weld hardness and residual stress are reduced, the comprehensive mechanical properties such as impact toughness of welded joint are improved.
Description
Technical field
The invention belongs to high-pressure boiler tube production technical fields, and in particular, to a kind of 12Cr1MoVG path heavy wall
Pipe welding method.
Background technique
With the raising of China's Fossil Fueled Power Plant Project unit capacity, parameter, the 12Cr1MoVG path of wall thickness 8mm~13mm
Pipe is widely used to super (super-) critical heating surface tubes in boilers, especially in 1000MW ultra supercritical tower boiler, double reheat
It is more widely applied in ultra-supercritical boiler heating surface tube.According to statistics, Shanghai Boiler Plant 1000MW ultra supercritical tower boiler
There are about 4600, for Harbin Boiler Plant 1000MW ultra supercritical π type boiler there are about 7400, Beijing boiler factory Ba Wei 1000MW is super
Overcritical π type boiler is there are about 5900, and Dongfang Boiler Factory 1000MW ultra supercritical π type boiler is there are about 7300, Dongfang Boiler Factory
There are about 13800 for 660MW double reheat ultra-supercritical boiler.If the 12Cr1MoVG small diameter tube that wall thickness is no more than 13mm can be cancelled
The post weld heat treatment technique of weld bond, it will boiler erection construction efficiency is greatly improved, shortens the construction period, reduce construction cost,
It is beneficial to energy conservation emission reduction simultaneously.
Summary of the invention
The purpose of the present invention is to provide a kind of 12Cr1MoVG path Thick Wall Tube Welding methods, by using tungsten argon arc
The combined welding method for welding bottoming and welding electrode arc welding filling capping, cancels post weld heat treatment technical process, improves welding procedure
Benefit is connect using weld preheating, control interlayer temperature, control one-pass weld thickness and postheating technological measure, reduction
Head weld hardness and residual stress improve the comprehensive mechanical properties such as impact toughness of welded joint.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of 12Cr1MoVG path Thick Wall Tube Welding method, includes the following steps：
Step S1, retaining wall on slope and cleaning
Banjo fixing butt jointing slope type is V-type, and bevel angle is 30 ° -35 °；By outer surface 10mm-15mm range in groove
Paint, dirt, rust, burr, flash removal on interior base material is clean, until issuing metallic luster；
Step S2, weldment group pair
Weldment group clock synchronization accomplishes that inner wall flushes, and group is 1mm-2mm to gap；
Step S3, positioning welding
It using hand tungsten argon arc welding method positioning welding, is gone through after positioning, determines flawless defect, discovery welding
Defect must use mechanical means removal of defects and relocate welding；
Step S4, weld preheating
Adopt oxygenation, acetylene torch heating carries out weld preheating, preheating temperature is 150 DEG C -200 when hand tungsten argon arc welding
℃；
Step S5, bottom welding
Bottom welding is carried out using the hand tungsten argon arc welding welding method of molten bath small volume, energy Relatively centralized, is subtracted
Small welding point root is lack of penetration, the welding defect of incomplete fusion, indent, protrusion generates, and root weld quality is effectively ensured；
Step S6, interlayer temperature measurement and control
Interlayer temperature is measured using infrared thermometer, interlayer temperature control range is 200 DEG C -300 DEG C, and interlayer temperature is low
Should be heated to 200 DEG C using flame when 200 DEG C can continue to weld, and interlayer temperature should suspend welding when being higher than 300 DEG C and wait for, temperature
Degree is down to 300 DEG C or less and can continue welding；
Step S7, welding electrode arc welding filling, cover welding
It is filled using welding rod arc soldering method, cover welding, using low current, string(er) bead, thin layer, fast welding
Small heat input welding procedure, control one-pass weld degree thickness guarantee lower layer's welding bead to the tempering of last time welding bead；
Step S8, postheating
Slow cooling is wrapped up using heat-preservation cotton immediately after the completion of welding；
Step S9, welding point cleaning and inspection
Connector to be welded carries out connector cleaning after being cooled to environment temperature and checks, all weld bond capping layers answer round and smooth mistake
It crosses, it must not fluted, rugged defect.
Further, weldment group clock synchronization described in step S2 has mismatch, and following limit value is not to be exceeded in mismatch value：It is no more than
The 10% of wall thickness, and it is not more than 1mm.
Further, the welding wire trade mark selects TIG-R31 in step S5, and gage of wire is Φ 2.5mm, and electric power polarity is direct current
It just connects, welding current 115A-125A, weldingvoltage 12V-13V.
Further, type of electrode selects R317 in step S7, and core diameter selects Φ 2.5mm, Φ 3.2mm, power supply pole
Property is DC reverse connection, when core diameter is Φ 2.5mm welding current be 70A-85A, weldingvoltage 23V-24V, core diameter
When for Φ 3.2mm welding current be 95A-115A, weldingvoltage 27V-28V.
Further, when step S9 is defective, reconditioning is carried out with angular mill.
Beneficial effects of the present invention：
(1) present invention is using hand tungsten argon arc welding bottoming, the combined welding method of welding electrode arc welding filling capping, cancellation
Post weld heat treatment technical process；Using the hand tungsten argon arc welding welding method bottoming of molten bath small volume, energy Relatively centralized,
Reduce the welding defects such as lack of penetration welding point root, incomplete fusion, indent, protrusion to generate, root weld quality is effectively ensured；It adopts
Cover welding method is filled with welding electrode arc welding, speed of welding is fast, is conducive to improve construction benefit, reduces construction cost；Cancel
Post weld heat treatment technical process improves construction benefit, reduces construction cost, and is beneficial to energy conservation emission reduction；
(2) present invention is strictly welded using the small heat input welding procedure of low current, string(er) bead, thin layer, fast welding
Preceding preheating, interlayer temperature control and postheating, control one-pass weld degree thickness guarantee tempering of lower layer's welding bead to last time welding bead
Processing；Using the small heat input welding procedure of low current, string(er) bead, thin layer, fast welding, it is hard that welding point weld seam is effectively reduced
Degree, residual stress；It is stringent to carry out weld preheating, interlayer temperature control and postheating, under control one-pass weld degree thickness guarantees
Tempering of the layer welding bead to last time welding bead, the comprehensive mechanical property for improving impact toughness of welded joint, guaranteeing welding point.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff all other embodiment obtained without creative efforts belongs to what the present invention protected
Range.
A kind of 12Cr1MoVG path Thick Wall Tube Welding method, includes the following steps：
Step S1, retaining wall on slope and cleaning
Banjo fixing butt jointing slope type is V-type, and bevel angle is 30 ° -35 °；By outer surface 10mm-15mm range in groove
Paint, dirt, rust, burr, flash removal on interior base material is clean, until issuing metallic luster；
Step S2, weldment group pair
Weldment group clock synchronization accomplishes that inner wall (root) flushes, and if any mismatch, following limit value is not to be exceeded in mismatch value：It is no more than
The 10% of wall thickness, and it is not more than 1mm；Group is 1mm-2mm to gap；
Step S3, positioning welding
Using hand tungsten argon arc welding method positioning welding, the defects of going through after positioning, determine flawless, such as find
Welding defect must use mechanical means removal of defects and relocate welding；
Step S4, weld preheating
Adopt oxygenation, acetylene torch heating carries out weld preheating, preheating temperature is 150 DEG C -200 when hand tungsten argon arc welding
℃；
Step S5, bottom welding
Bottom welding is carried out using the hand tungsten argon arc welding welding method of molten bath small volume, energy Relatively centralized, is subtracted
Small welding point root is lack of penetration, the welding defect of incomplete fusion, indent, protrusion generates, and root weld quality is effectively ensured；Welding wire
The trade mark selects TIG-R31, and gage of wire is Φ 2.5mm, and electric power polarity is straight polarity direct current, welding current 115A-125A, welding
Voltage is 12V-13V；
Step S6, interlayer temperature measurement and control
Interlayer temperature is measured using infrared thermometer, interlayer temperature control range is 200 DEG C -300 DEG C, and interlayer temperature is low
Should be heated to 200 DEG C using flame when 200 DEG C can continue to weld, and interlayer temperature should suspend welding when being higher than 300 DEG C and wait for, temperature
Degree is down to 300 DEG C or less and can continue welding；
Step S7, welding electrode arc welding filling, cover welding
It is filled using welding rod arc soldering method, cover welding, using low current, string(er) bead, thin layer, fast welding
Small heat input welding procedure, control one-pass weld degree thickness guarantee lower layer's welding bead to the tempering of last time welding bead；Type of electrode
R317 is selected, core diameter selects Φ 2.5mm, Φ 3.2mm, and electric power polarity is DC reverse connection, and core diameter welds when being Φ 2.5mm
Connect electric current be 70A-85A, weldingvoltage 23V-24V, when core diameter is Φ 3.2mm welding current be 95A-115A, welding
Voltage is 27V-28V；
Step S8, postheating
Slow cooling is wrapped up using heat-preservation cotton immediately after the completion of welding；
Step S9, welding point cleaning and inspection
Connector to be welded carries out connector cleaning after being cooled to environment temperature and checks, all weld bond capping layers answer round and smooth mistake
Cross, must not fluted, rugged defect, can be used angular mill to carry out reconditioning when necessary.
Non-standard sample is taken the lead using 5mm × 10mm × 120mm, by GB/T 2651-2008 " welding point tension test
Method ", carries out tension test on CMT5105 type electronic universal tester, and crosshead displacement rate is 2mm/min；
Table 1 lists as-welded and PWHT state 12Cr1MoVG welding point flat specimen mechanical properties, surrender by force
Degree, elongation percentage and fracture position
It is found that as-welded and PWHT state welding point temperature tensile mechanical property meets DL/T 868-2014《Welder
Skill evaluates regulation》And NB/T 47014-2011《Bearing device welding qualification》The requirement of standard.PWHT state 12Cr1MoVG welding
Yield strength, the tensile strength of connector are more as-welded to decrease, but elongation percentage increases, and sample stretching fracture position is one
Side base material is in dimple aggregation Fracture Characteristics；
Using 10mm × 10mm × 55mm Charpy notch standard sample, notch opens up position and accords in weld seam, heat affected area
Close GB/T 2650《Welding point impact test method》Requirement.The room temperature impact of joint samples is tested in NI300C type instrument
Change and is carried out on metal pendulum bob impact testing, test result is as follows table：
The average impact toughness of the as-welded and steel welded joint sample heat affected area PWHT state 12Cr1MoVG and weld metal zone difference
For 220.4J/cm2、43.5J/cm2And 259.2J/cm2, 105.7J/cm2；As-welded and PWHT state 12Cr1MoVG steel connects
The impact flexibility of head sample commissure meets DL/T 868-2014《Qualification of welding procedure regulation》And NB/T 47014-2011《It holds
Press equipment welding qualification》The requirement of standard；The heat affected area of PWHT state 12Cr1MoVG welding point and the impact flexibility of commissure
More as-welded to increase, especially the impact flexibility of commissure improves the most obvious；
Using 2.2mm × 15mm × 185mm drawing by high temperature rectangle proportional test bar, by GB/T 4338《Metal Materials At High Temperature is drawn
Stretch experimental method》, respectively at 300 DEG C, 400 DEG C, 500 DEG C and 600 on Shimadzu AG-X PLUS type microcomputer control universal testing machine
High temperature tension test is carried out under DEG C state, crosshead displacement rate is 2mm/min, and test result is as follows shown in table：
The high temperature tensile properties of as-welded 12Cr1MoVG welding point：
The high temperature tensile properties of PWHT state 12Cr1MoVG welding point：
In 300-600 DEG C of Range of measuring temp, the elevated temperature strength and plasticity of as-welded connector are above PWHT state connector.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (5)
1. a kind of 12Cr1MoVG path Thick Wall Tube Welding method, which is characterized in that include the following steps：
Step S1, retaining wall on slope and cleaning
Banjo fixing butt jointing slope type is V-type, and bevel angle is 30 ° -35 °；By in groove within the scope of outer surface 10mm-15mm it is female
Paint, dirt, rust, burr, flash removal on material is clean, until issuing metallic luster；
Step S2, weldment group pair
Weldment group clock synchronization accomplishes that inner wall flushes, and group is 1mm-2mm to gap；
Step S3, positioning welding
It using hand tungsten argon arc welding method positioning welding, is gone through after positioning, determines flawless defect, find welding defect
Using mechanical means removal of defects and welding must be relocated；
Step S4, weld preheating
Adopt oxygenation, acetylene torch heating carries out weld preheating, preheating temperature is 150 DEG C -200 DEG C when hand tungsten argon arc welding；
Step S5, bottom welding
Bottom welding is carried out using the hand tungsten argon arc welding welding method of molten bath small volume, energy Relatively centralized, reduces weldering
The welding defect generation for connecing the lack of penetration root of joint, incomplete fusion, indent, protrusion, is effectively ensured root weld quality；
Step S6, interlayer temperature measurement and control
Interlayer temperature is measured using infrared thermometer, interlayer temperature control range is 200 DEG C -300 DEG C, and interlayer temperature is lower than
Should be heated to 200 DEG C using flame at 200 DEG C can continue to weld, and interlayer temperature should suspend welding when being higher than 300 DEG C and wait for, temperature
Being down to 300 DEG C or less can continue welding；
Step S7, welding electrode arc welding filling, cover welding
Be filled using welding rod arc soldering method, cover welding, using low current, string(er) bead, thin layer, fast welding small line
Energy welding procedure, control one-pass weld degree thickness guarantee lower layer's welding bead to the tempering of last time welding bead；
Step S8, postheating
Slow cooling is wrapped up using heat-preservation cotton immediately after the completion of welding；
Step S9, welding point cleaning and inspection
Connector to be welded carries out connector cleaning after being cooled to environment temperature and checks, all weld bond capping layers answer rounding off, no
Obtain fluted, rugged defect.
2. a kind of 12Cr1MoVG path Thick Wall Tube Welding method according to claim 1, which is characterized in that in step S2
The weldment group clock synchronization has mismatch, and following limit value is not to be exceeded in mismatch value：No more than the 10% of wall thickness, and it is not more than 1mm.
3. a kind of 12Cr1MoVG path Thick Wall Tube Welding method according to claim 1, which is characterized in that in step S5
The welding wire trade mark selects TIG-R31, and gage of wire is Φ 2.5mm, and electric power polarity is straight polarity direct current, welding current 115A-125A,
Weldingvoltage is 12V-13V.
4. a kind of 12Cr1MoVG path Thick Wall Tube Welding method according to claim 1, which is characterized in that in step S7
Type of electrode selects R317, and core diameter selects Φ 2.5mm, Φ 3.2mm, and electric power polarity is DC reverse connection, core diameter Φ
When 2.5mm welding current be 70A-85A, weldingvoltage 23V-24V, welding current is 95A- when core diameter is Φ 3.2mm
115A, weldingvoltage 27V-28V.
5. a kind of 12Cr1MoVG path Thick Wall Tube Welding method according to claim 1, which is characterized in that step S9 has
When defect, reconditioning is carried out with angular mill.
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Cited By (12)
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| CN109454349A (en) * | 2018-11-23 | 2019-03-12 | 安徽应流集团霍山铸造有限公司 | A kind of heat treatment method reducing steel-casting machined surface weld hardness |
| CN109794668A (en) * | 2018-11-28 | 2019-05-24 | 华电电力科学研究院有限公司 | A kind of martensite heat-resistant steel container closes up seam welding method |
| CN109909581A (en) * | 2019-04-09 | 2019-06-21 | 安徽马钢设备检修有限公司 | A kind of ring rolling mill large size cross roll axis surface defect online process for welding repair by hand |
| CN110331273A (en) * | 2019-05-23 | 2019-10-15 | 山东电力建设第三工程有限公司 | A kind of weld bond heat treatment method of soft alloy pipeline |
| CN110548945A (en) * | 2019-08-08 | 2019-12-10 | 上海振华重工启东海洋工程股份有限公司 | Welding process for reamer head wrapping plate of cutter suction dredger |
| CN110744180A (en) * | 2019-09-29 | 2020-02-04 | 山东临工工程机械有限公司 | Welding method for effectively inhibiting weld toe defects of annular weld joint of medium plate |
| CN112705867A (en) * | 2019-10-24 | 2021-04-27 | 青岛九合重工机械有限公司 | Method for welding T-shaped joint of pump truck |
| CN112935479A (en) * | 2021-03-25 | 2021-06-11 | 安徽马钢设备检修有限公司 | Welding device and repairing process for large wheel fixing table base fracture |
| CN114247960A (en) * | 2021-12-14 | 2022-03-29 | 北京城建集团有限责任公司 | Welding process for steel pipe in snow making system |
| CN114346380A (en) * | 2022-02-18 | 2022-04-15 | 上海绿地建设(集团)有限公司 | Welding process of high-strength steel structure |
| CN115533259A (en) * | 2022-11-09 | 2022-12-30 | 郑州煤矿机械集团股份有限公司 | Method for restraining lack of narrow gap welding seam of oil cylinder of coal mine hydraulic support |
| CN116660492A (en) * | 2023-05-30 | 2023-08-29 | 中国电力建设工程咨询有限公司 | Method and system for butt joint selective welding process |
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Cited By (16)
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| CN109454349A (en) * | 2018-11-23 | 2019-03-12 | 安徽应流集团霍山铸造有限公司 | A kind of heat treatment method reducing steel-casting machined surface weld hardness |
| CN109794668A (en) * | 2018-11-28 | 2019-05-24 | 华电电力科学研究院有限公司 | A kind of martensite heat-resistant steel container closes up seam welding method |
| CN109794668B (en) * | 2018-11-28 | 2021-01-01 | 华电电力科学研究院有限公司 | Method for welding closure seam of martensite heat-resistant steel container |
| CN109909581A (en) * | 2019-04-09 | 2019-06-21 | 安徽马钢设备检修有限公司 | A kind of ring rolling mill large size cross roll axis surface defect online process for welding repair by hand |
| CN110331273A (en) * | 2019-05-23 | 2019-10-15 | 山东电力建设第三工程有限公司 | A kind of weld bond heat treatment method of soft alloy pipeline |
| CN110548945A (en) * | 2019-08-08 | 2019-12-10 | 上海振华重工启东海洋工程股份有限公司 | Welding process for reamer head wrapping plate of cutter suction dredger |
| CN110744180B (en) * | 2019-09-29 | 2021-08-03 | 山东临工工程机械有限公司 | Welding method for effectively inhibiting weld toe defects of annular weld joint of medium plate |
| CN110744180A (en) * | 2019-09-29 | 2020-02-04 | 山东临工工程机械有限公司 | Welding method for effectively inhibiting weld toe defects of annular weld joint of medium plate |
| CN112705867A (en) * | 2019-10-24 | 2021-04-27 | 青岛九合重工机械有限公司 | Method for welding T-shaped joint of pump truck |
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| CN114247960A (en) * | 2021-12-14 | 2022-03-29 | 北京城建集团有限责任公司 | Welding process for steel pipe in snow making system |
| CN114346380A (en) * | 2022-02-18 | 2022-04-15 | 上海绿地建设(集团)有限公司 | Welding process of high-strength steel structure |
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| CN115533259B (en) * | 2022-11-09 | 2023-08-22 | 郑州煤矿机械集团股份有限公司 | Narrow-gap weld defect suppression method for hydraulic support cylinder of coal mine |
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