CN107150161A - A kind of T91 steel welding technologies - Google Patents
A kind of T91 steel welding technologies Download PDFInfo
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- CN107150161A CN107150161A CN201710383908.9A CN201710383908A CN107150161A CN 107150161 A CN107150161 A CN 107150161A CN 201710383908 A CN201710383908 A CN 201710383908A CN 107150161 A CN107150161 A CN 107150161A
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- welding
- weld
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a 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
- B23K9/23—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
- B23K9/235—Preliminary treatment
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- Engineering & Computer Science (AREA)
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of T91 steel welding technologies.Including：The step of the step of welding preparation, weld preheating, the step of welded using GTAW, post weld heat treatment the step of；The welding preparation step includes：Set pipeline in argon-filling device step by step；The step of use GTAW is welded includes：Argon gas is filled with into pipeline argon-filled protection is carried out step by step to back of weld.The present invention to back of weld by carrying out argon-filled protection; carry out weld preheating; using Olympic health wlding, using rational welding condition; control weld seam interlayer temperature, throat depth and width; carry out the measures such as post weld heat treatment; the T91 steel welded joints of acquisition excellent performance can be ensured well, so as to improve product quality.The inventive method is particularly suitable for use in the welding of small-caliber thin-walled tube T91 steel welded joint of the wall thickness less than 10mm.
Description
Technical field
It is to be directed to small-caliber thin-walled tube T91 steel welding technologies the present invention relates to power station equipment mounting technique field.
Background technology
In order to reduce cost of electricity-generating, improve the ecological environment, save primary energy, country accelerates construction Large Copacity high parameter
Unit（Particularly supercritical unit）Paces.High temperature reheater, high temperature superheater and pendant superheater of these units etc. are
Row under the overall leadership largely uses T91 steel.Because the welding difficulty of T91 steel is big, technological requirement is strict.Current T91 steel welded joints
Performance it is preferable not enough, on product quality influence it is larger, welding technique is further improved.Therefore, using scientific and reasonable
Advanced welding procedure be just particularly important to obtain the T91 steel joints of excellent performance.
In the prior art, Application No. 201110427684.X Chinese invention patent application discloses a kind of P92/T92
The welding procedure and heater of steel pipe, the welding procedure include bevel, heating, are welded to few welding two using bottom argon arc welding
Layer, steel pipe internal ratio is protected in steel filling steel pipes with argon in welding, manual electric arc welding, insulation, the technique such as post weld heat treatment,
Coordinate Special heater simultaneously, the Chinese invention patent of Application No. 201210379322.2 discloses a kind of nickel-base alloy
Tig Welding method, including：（One）Wlding is chosen；（Two）It is prepared by welding preparation, groove；（Three）Welding, using multilayer
The mode of multi-pass welding, control weld interpass temperature is no more than 150 DEG C；And set specific welding condition；（Four）Weldering
After examine.The tungsten of a kind of pearlite heatproof steel of Application No. 201110402786.6 disclosure of the invention and austenitic heat-resistance steel steel pipe
Electrode argon arc welding welding procedure, by using the welding material of high alloy, strict implement welding procedure reduces heat input, control weldering
What the penetration ratio met was realized, its welding procedure is：1. the selection of welding method, welding material and weld groove form；2. before weldering
Prepare：The cleaning of groove, prepare and argon-filling device be installed, weld preheating；3. the control of interlayer temperature；4. welding condition
Formulate；5. detection：Visual examination and Non-Destructive Testing, mechanical property test, the microstructure examination of welding point.It is existing more than
There is technology, be difficult to the T91 steel welded joints for obtaining excellent performance.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of T91 for the T91 steel welded joints that can obtain excellent performance
Steel welding technology, it is adaptable to which wall thickness is less than 10mm small-caliber thin-walled tube T91 steel welded joints.
The purpose of the present invention can be achieved through the following technical solutions：A kind of T91 steel welding technologies, including：Welding preparation
The step of, weld preheating the step of, the step of welded using GTAW, post weld heat treatment the step of；It is described
Welding preparation step includes：Set pipeline in argon-filling device step by step；What the use GTAW was welded
Step includes：Argon gas is filled with into pipeline argon-filled protection is carried out step by step to back of weld.
The welding preparation step is specifically included：
（1）Prepare groove：The preparation of groove is carried out using machining process to mother metal pipe；
（2）Groove is polished：Mother metal inside pipe wall and outer wall near groove face and groove is cleared up；
（3）Counterpart works：It will prepare between the two mother metal pipes docking for groove of having polished, two mother metal pipes and form weld seam, carry out
Counterpart tack welding, makes two mother metal pipe groups to being fixed into pipeline；
（4）It is windproof to keep off the rain：The windproof facility that keeps off the rain has been set up in advance；
（5）Argon-filling device in pipeline is set, for carrying out argon-filled protection to back of weld：The pipe ends mouth of pipe is close with the water soluble paper
Envelope, wherein one end are set into argon gas hole, and the other end is totally-enclosed end；With the water soluble paper at pipe welding seam excircle by weld joint close
Envelope, preset clearance is easy to air to overflow during seal-weld.
The step of weld preheating, includes：
（1）Using burning hot heating, 3 times of weldment thickness are no less than per side width of heating, and not less than 100mm；
（2）Preheating temperature is 100-150 DEG C, and is monitored with far infrared temperature measurement rifle；
（3）During welding, if welding is interrupted, preheated before welding again；
The step of use GTAW is welded includes：
（1）Select welding material：Welding material uses Olympic health welding wire；
（2）Bottoming is welded：Bottoming welding includes first layer welding；After preheating temperature reaches requirement, by entering argon gas hole to pipe
Argon gas is filled with road argon-filled protection is carried out to back of weld, proceed by bottom argon arc welding welding；Electrode is cerium tungsten electrode Φ 2.5；
Argon arc welding argon flow amount is 8-12L/min, and it is 8-10 L/min that argon-filled protection argon flow amount is carried out to back of weld；Welding current
For 90-110A；Weldingvoltage is 10-14V；
（3）Capping layer welding：Capable inspection is tapped into backing welding, capping layer welding is carried out after having checked, capping layer welding is used
Welding wire, argon arc welding argon flow amount, argon-filled protection argon flow amount, weldingvoltage carried out to back of weld all weld phase with bottoming
Together, welding current is 90-110A；
Bottoming welding thickness degree is not less than 3mm, and the thickness of capping layer welding is less than or equal to 3mm；Individual layer width is not more than
9.6mm；Molten bath is filled up when arc is received in welding；
The step of post weld heat treatment, includes：Welding point is warming up to 750~770 DEG C by 150 DEG C/h programming rate；Connect
Constant temperature 1 hour under 760 DEG C or so；After constant temperature 1 hour, welding point is cooled to 300 by 150 DEG C/h cooling rate
Below DEG C, then welding point is allowed freely to be cooled to room temperature in atmosphere.
Pipe insulation width during post weld heat treatment is calculated per each 100mm in side from Weld pipe mill toward both sides；Post weld heat treatment
When, the temperature difference is less than 20 DEG C between any two points of welding point.
The T91 steel is the T91 steel that wall thickness is less than 10mm.
T91 steel welding technologies of the present invention carry out weld preheating, using Olympic health by carrying out argon-filled protection to back of weld
Wlding, using rational welding condition, control weld seam interlayer temperature, throat depth and width carry out post weld heat treatment etc.
Measure, can ensure to obtain the T91 steel welded joints of excellent performance, so as to improve product quality well.The inventive method is special
It is less than the welding of 10mm small-caliber thin-walled tube T91 steel welded joints suitable for wall thickness.
Brief description of the drawings
Fig. 1 is the groove schematic diagram in the present invention；
Fig. 2 is argon-filling device schematic diagram in the pipeline in the present invention；
In figure：1st, argon gas hole is entered, 2, mother metal pipe one, 3, docking port, 4, mother metal pipe two, 5, totally-enclosed end.
Embodiment
A kind of T91 steel welding technologies, are adapted to the small-caliber thin-walled tube T91 steel welded joints that wall thickness is less than 10mm, butt welding
Mouth carries out weld preheating, and using full argon arc welding, postwelding is heat-treated in time.Its welding procedure is comprised the following steps that：（1）Weldering
It is preceding to prepare；（2）Weld preheating；（3）GTAW is welded, and GTAW welding is bottoming welding, filling, lid
Face welding uses GTAW, and the welding wire that GTAW welding is used is Olympic health welding wire：OE-
CRMO91/Φ2.4；（4）Post weld heat treatment.The present invention has carried out tight detailed design to T91 steel welding technologies, is small-bore
The welding job of light-wall pipe T91 steel provides standardization, normative technological operation rules.
T91 steel welding technologies of the present invention are further described below.
T91 steel welding technologies are operated according to the following steps：
First, welding preparation
1.1 prepare groove：The preparation of groove is carried out with machining process, must not use gas flame cuttiug cutting groove.Groove is V
Shape groove, requires that carrying out groove makes and counterpart work, as shown in Figure 1 according to prespecified size（Unit：mm）；
1.2 grooves are polished：Weldment（Pipeline）Before assembling by groove face and mother metal near (inside and outside wall) groove oil, paint,
Dirt, rust etc. are cleaned out, and cleanup area is：Banjo fixing butt jointing groove center both sides, are respectively 10~15mm per side；
1.3 counterpart tack weldings：Two mother metal pipes of groove of having polished will be prepared（Mother metal pipe 1, mother metal pipe 24）Docking, two
Between mother metal pipe（At docking port 3）Weld seam is formed, counterpart tack welding is carried out, makes two mother metal pipe groups to being fixed into pipeline；Solid point
It is same that phase is welded in welding wire, welding procedure and the GTAW bottoming of weldering；
1.4 windproof keep off the rain：Set up the reliable windproof facility that keeps off the rain in advance according to weather condition, it is necessary to assure without wind and rainwater
Influence；
1.5 set argon-filling device in pipeline, for carrying out argon-filled protection to back of weld：Pipe ends are sealed with the water soluble paper,
Wherein one end stays one to enter argon gas hole 1, and the other end is totally-enclosed end 5.With the water soluble paper at pipe welding seam excircle by group to solid
Upper end stays a little gap to be easy to air to overflow at the weld seam sealing set, weld seam sealing；The water soluble paper is the high temperature resistant water soluble paper.As schemed
Shown in 2.
2nd, weld preheating
2.1, using burning hot heating, are no less than 3 times of weldment thickness, and cannot be less than 100mm per side width of heating；
2.2 preheating temperatures are 100-150 DEG C, and are monitored with far infrared temperature measurement rifle；
During 2.3 weldings, T91 steel interlayer temperature should be not less than the lower limit of defined preheating temperature, and not higher than 300 DEG C, such as
Welding is interrupted, must be preheated before welding again.
3rd, weld
3.1 welding material：Using Olympic health welding wire OE-CRMO91/ Φ 2.4；
3.2 bottoming are welded, i.e., first layer is welded：After preheating temperature reaches requirement, argon is filled with into pipeline by entering argon gas hole
Gas carries out argon-filled protection to back of weld (also can start to be filled with argon gas pair in pipeline setting after argon-filling device as needed
Back of weld carries out argon-filled protection), proceed by bottom argon arc welding welding.Welding wire welds for OE-CRMO91/ Φ 2.4 Olympic health
Silk；Electrode is cerium tungsten electrode Φ 2.5；Argon arc welding argon flow amount is 8-12L/min, back-protective（Argon filling is carried out to back of weld
Protection）Argon flow amount is 8-10 L/min；Welding current is 90-110A；Weldingvoltage is 10-14V.
3.3 cappings layer（The second layer）Welding：Capable inspection is tapped into backing welding, capping layer welding, lid are carried out after having checked
Welding wire that surface layer welding is used, argon arc welding argon flow amount, back of weld is carried out argon-filled protection argon flow amount, weldingvoltage all with
Bottoming welding is identical, and welding current is 90-110A.
Specific technological parameter see the table below：（By taking 42 × 5mm of Φ T91 steel welded joints as an example）
The layer thickness of 3.4 bottom argon arc weldings cannot be less than 3mm, and the layer thickness of capping layer should be controlled within 3mm；Individual layer
The width of weld seam cannot be greater than 9.6mm.
, should when receiving arc it should be specifically noted that joint, the starting the arc, receiving the quality of welding at arc in 3.5 weldings, it is ensured that fusion is good
Molten bath is filled up.
After the completion of welding, welding portion formation welding point.
4th, post weld heat treatment：
4.1 welding complete that after simultaneously self-inspection is qualified post weld heat treatment should be carried out in time.
Welding point is warming up to 750~770 DEG C by 4.2 by 150 DEG C/h programming rate；Then in 760 DEG C or so constant temperature 1
Hour；After constant temperature 1 hour, welding point is cooled to less than 300 DEG C by 150 DEG C/h cooling rate, weldering then can be allowed
Joint is freely cooled to room temperature in atmosphere.
Insulation width during 4.3 heat treatment starts at every side for 100mm from Weld pipe mill.
During 4.4 post weld heat treatment, and ensure in PWHT procedures, the temperature difference is less than between any two points of welding point
20℃。
Welding procedure of the present invention by back of weld carry out argon-filled protection, carry out weld preheating, using Olympic health wlding,
Using rational welding condition, control weld seam interlayer temperature, throat depth and width carry out the measure energy such as post weld heat treatment
The T91 steel welded joints of acquisition excellent performance are ensured well, are particularly suitable for use in the small-caliber thin-walled tube T91 that wall thickness is less than 10mm
Steel welded joint.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., be all contained within protection scope of the present invention.
Claims (8)
1. a kind of T91 steel welding technologies, including：The step of the step of welding preparation, weld preheating, using GTAW
The step of the step of being welded, post weld heat treatment；It is characterized in that, the welding preparation step includes：Argon filling in pipeline is set
Device is step by step；The step of use GTAW is welded includes：Argon gas is filled with into pipeline to weld seam
The back side carries out argon-filled protection step by step.
2. T91 steel welding technologies according to claim 1, it is characterized in that, the welding preparation step is specifically included：
（1）Prepare groove：The preparation of groove is carried out using machining process to mother metal pipe；
（2）Groove is polished：Mother metal inside pipe wall and outer wall near groove face and groove is cleared up；
（3）Counterpart works：It will prepare between the two mother metal pipes docking for groove of having polished, two mother metal pipes and form weld seam, carry out
Counterpart tack welding, makes two mother metal pipe groups to being fixed into pipeline；
（4）It is windproof to keep off the rain：The windproof facility that keeps off the rain has been set up in advance；
（5）Argon-filling device in pipeline is set, for carrying out argon-filled protection to back of weld：The pipe ends mouth of pipe is close with the water soluble paper
Envelope, wherein one end are set into argon gas hole, and the other end is totally-enclosed end；With the water soluble paper at pipe welding seam excircle by weld joint close
Envelope, preset clearance is easy to air to overflow during seal-weld.
3. T91 steel welding technologies according to claim 1, it is characterized in that, include the step of the weld preheating：
（1）Using burning hot heating, 3 times of weldment thickness are no less than per side width of heating, and not less than 100mm；
（2）Preheating temperature is 100-150 DEG C, and is monitored with far infrared temperature measurement rifle；
（3）During welding, if welding is interrupted, preheated before welding again.
4. T91 steel welding technologies according to claim 1, it is characterized in that, the use GTAW is welded
The step of connecing includes：
（1）Select welding material：Welding material uses Olympic health welding wire；
（2）Bottoming is welded：Bottoming welding includes first layer welding；After preheating temperature reaches requirement, by entering argon gas hole to pipe
Argon gas is filled with road argon-filled protection is carried out to back of weld, proceed by bottom argon arc welding welding；Electrode is cerium tungsten electrode Φ 2.5；
Argon arc welding argon flow amount is 8-12L/min, and it is 8-10 L/min that argon-filled protection argon flow amount is carried out to back of weld；Welding current
For 90-110A；Weldingvoltage is 10-14V；
（3）Capping layer welding：Capable inspection is tapped into backing welding, capping layer welding is carried out after having checked, capping layer welding is used
Welding wire, argon arc welding argon flow amount, argon-filled protection argon flow amount, weldingvoltage carried out to back of weld all weld phase with bottoming
Together, welding current is 90-110A.
5. T91 steel welding technologies according to claim 4, it is characterized in that, bottoming welding thickness degree is not less than 3mm, capping
The thickness of layer welding is less than or equal to 3mm；Individual layer width is not more than 9.6mm；Molten bath is filled up when arc is received in welding.
6. T91 steel welding technologies according to claim 1, it is characterized in that, include the step of the post weld heat treatment：Press
Welding point is warming up to 750~770 DEG C by 150 DEG C/h programming rate；Then constant temperature is descended 1 hour at 760 DEG C or so；In constant temperature
After 1 hour, welding point is cooled to less than 300 DEG C by 150 DEG C/h cooling rate, then allow welding point in atmosphere from
By being cooled to room temperature.
7. T91 steel welding technologies according to claim 6, it is characterized in that, pipe insulation width during post weld heat treatment from
Weld pipe mill rises toward both sides and calculated per each 100mm in side；During post weld heat treatment, the temperature difference is less than 20 DEG C between any two points of welding point.
8. T91 steel welding technologies according to claim 1, it is characterized in that, the T91 steel is the T91 that wall thickness is less than 10mm
Steel.
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| CN201710383908.9A CN107150161A (en) | 2017-05-26 | 2017-05-26 | A kind of T91 steel welding technologies |
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| CN201710383908.9A CN107150161A (en) | 2017-05-26 | 2017-05-26 | A kind of T91 steel welding technologies |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107598332A (en) * | 2017-10-16 | 2018-01-19 | 山东电力建设第工程公司 | The welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel |
| CN108788405A (en) * | 2018-06-21 | 2018-11-13 | 天津大学 | The tungsten argon arc welding method of austenitic heat-resistance steel |
| CN109623104A (en) * | 2018-10-26 | 2019-04-16 | 上海锅炉厂有限公司 | A kind of T91 panelized-tube-wall section scene counterpart mounting process method |
| CN112719520A (en) * | 2020-12-17 | 2021-04-30 | 江苏利柏特股份有限公司 | Martensitic alloy steel process pipeline manual argon-electric combined welding and heat treatment process |
| CN112986005A (en) * | 2021-03-01 | 2021-06-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Creep test method for power station heated surface pipe welding joint |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273176A (en) * | 2013-04-25 | 2013-09-04 | 大唐山东电力检修运营有限公司 | Welding method for T91 steel and 1Crl8Ni9Ti dissimilar steel |
-
2017
- 2017-05-26 CN CN201710383908.9A patent/CN107150161A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103273176A (en) * | 2013-04-25 | 2013-09-04 | 大唐山东电力检修运营有限公司 | Welding method for T91 steel and 1Crl8Ni9Ti dissimilar steel |
Non-Patent Citations (4)
| Title |
|---|
| 冯建辉: "SA213-T91钢焊接工艺及过程控制", 《电力建设》 * |
| 刘其中: "锅炉过热器换管改造T91钢焊接技术应用", 《焊接技术》 * |
| 唐燕玲: "SA-213T91 的焊接工艺", 《焊接》 * |
| 杨加富: "SA-213T91钢小径管现场焊接工艺", 《云南电力技术》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107598332A (en) * | 2017-10-16 | 2018-01-19 | 山东电力建设第工程公司 | The welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel |
| CN107598332B (en) * | 2017-10-16 | 2020-05-08 | 山东电力建设第一工程公司 | Novel CB2 heat-resistant steel medium-large diameter pipeline welding and heat treatment process |
| CN108788405A (en) * | 2018-06-21 | 2018-11-13 | 天津大学 | The tungsten argon arc welding method of austenitic heat-resistance steel |
| CN109623104A (en) * | 2018-10-26 | 2019-04-16 | 上海锅炉厂有限公司 | A kind of T91 panelized-tube-wall section scene counterpart mounting process method |
| CN112719520A (en) * | 2020-12-17 | 2021-04-30 | 江苏利柏特股份有限公司 | Martensitic alloy steel process pipeline manual argon-electric combined welding and heat treatment process |
| CN112986005A (en) * | 2021-03-01 | 2021-06-18 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Creep test method for power station heated surface pipe welding joint |
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Application publication date: 20170912 |