CN106624285A - 350 MW unit main steam pipeline-P91 welding process - Google Patents
350 MW unit main steam pipeline-P91 welding process Download PDFInfo
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- CN106624285A CN106624285A CN201611272669.1A CN201611272669A CN106624285A CN 106624285 A CN106624285 A CN 106624285A CN 201611272669 A CN201611272669 A CN 201611272669A CN 106624285 A CN106624285 A CN 106624285A
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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
-
- 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
-
- 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
-
- 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
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
-
- 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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a 350 MW unit main steam pipeline-P91 welding process. The welding process mainly comprises the five steps of pre-welding preparation, pre-welding preheating, control of interlayer temperature, welding and post-welding heat treatment. According to the 350 MW unit main steam pipeline-P91 welding process, the welding beam is uniform and attractive, the molding is good, the performance of impact toughness, welding brittleness, post-welding heat treatment, welding heat affected zone of the welding joint can be improved, and the service life of a boiler and a pipeline can be prolonged.
Description
Technical field
The present invention relates to pipeline welding technical field, specially a kind of 350MW Main Steam Pipeline of Unit-P91 welding procedures.
Background technology
ASME SA335P91 steel pipes, with excellent elevated temperature strength and high temperature oxidation resistance, but the relatively low conjunction of its welding performance
Golden heat resisting steel is poor, if welding procedure is not good enough, weld metal ballistic work often occurs lowly, in addition welding point different characteristic region
Mechanical property difference and easily cause stress concentration, therefore be also easy to produce initial failure.Such as certain power plant 125MW unit main steam pipes
Road, due to welding point hardness deficiency, booster after running 9 months.Therefore, optimization welding is concentrated mainly on to the research of T/P91
Technique, seeks technology controlling and process joint performance mechanism, and innovative technology core technology improves impact toughness of welded joint, weldering
The performance of fragility, post weld heat treatment and welding heat affected zone is connect, it is that industry energy conservation wound effect is carried to improve boiler and pipeline service life
For technical support.Boiler tubing operation does not reach the time of standard requirement, and the security incidents such as booster occur in advance, can follow at present
Welding procedure scope it is larger.Welding condition matches improper with thermal parameter, by technological experiment, selects preferred process,
Training for skilled worker provides technical parameter.
The content of the invention
It is an object of the invention to provide a kind of 350MW Main Steam Pipeline of Unit-P91 welding procedures, to solve the above-mentioned back of the body
The problem proposed in scape technology.
For achieving the above object, the present invention provides following technical scheme：A kind of 350MW Main Steam Pipeline of Unit-P91 welding
Technique, it is characterised in that：Comprise the following steps：
A, welding preparation：
A, back cover layer：Back cover welding is carried out using the two-sided protection weldering of tungsten inert gas, welding material is MTS3 welding wires, is welded
Silk specification is φ 2.4mm；
B, packed layer：Layer welding is filled using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 2.5mm；
C, capping layer：Capping layer welding is carried out using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 3.2mm；
D, bevel：Double V-groove is opened steel pipe with lathe and boring and milling machine, and bevel angle is 55 ° -65 °, and root face is 1.2mm-
1.5mm；
B, weld preheating：Mother metal is preheated using Electric heating, preheating speed is 100 DEG C/h-150 DEG C/h, in advance
Hot temperature is 150-200 DEG C, reaches constant temperature 120min-150min after preheating temperature；
C, control interlayer temperature：Using being heated up using Electric heating, thermometric is carried out using infrared thermometer, controlled
Welding temperature processed is welded afterwards at 200 DEG C -300 DEG C；
D, welding：Comprise the following steps：
A, envelope backing weld：Gas tungsten arc welding is adopted with the speed of welding and 9- of 42mm/min-57mm/min
The intake velocity of 11L/min is welded, welding current 90-110A, weldingvoltage 10-16V, heat input 1.3-1.7KJ/
mm；
B, packed layer welding：Adopt manual electric arc welding and welded with the speed of welding of 50mm/min-60mm/min, weld
Electric current 70-90A, weldingvoltage 18-20V, heat input 1.5-1.8KJ/mm；
C, the welding of capping layer：Adopt manual electric arc welding and welded with the speed of welding of 70-80mm/min, welding current
115-125A, weldingvoltage 18-20V, heat input 1.3-2.0KJ/mm；
E, post weld heat treatment：Weldment is first lowered the temperature, is heated up afterwards, then constant temperature, then the mode lowered the temperature is heat-treated.
Preferably, heat treatment method is comprised the following steps in step E：
A, weldment is carried out into Slow cooling with the speed of 100 DEG C/h-150 DEG C/h, until temperature is down to 100 DEG C -120 DEG C
Constant temperature 1h afterwards；
B, weldment heated by electrically heated mode again, heated up with the speed of 100 DEG C/h-150 DEG C/h,
Constant temperature 4h after rising to 750 DEG C -770 DEG C；
C, weldment carried out with the speed of 100 DEG C/h-150 DEG C/h slowly cooling to 300 DEG C again, naturally cooled to afterwards
Normal temperature.
Compared with prior art, the invention has the beneficial effects as follows：Main steam line-P91 welding procedure the weld seams of the present invention
Uniform attractive in appearance, shaping is good, can improve impact toughness of welded joint, welding fragility, post weld heat treatment and sweating heat
The performance of the zone of influence, improves boiler and pipeline service life.
Specific embodiment
The technical scheme in the embodiment of the present invention is clearly and completely described below, it is clear that described embodiment
Only a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, the common skill in this area
The every other embodiment that art personnel are obtained under the premise of creative work is not made, belongs to the model of present invention protection
Enclose.
Embodiment one：
A kind of 350MW Main Steam Pipeline of Unit-P91 welding procedures, comprise the following steps：
A, welding preparation：
A, back cover layer：Back cover welding is carried out using gas tungsten arc welding, welding material is MTS3 welding wires, and welding wire is advised
Lattice are φ 2.4mm；
B, packed layer：Layer welding is filled using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 2.5mm；
C, capping layer：Capping layer welding is carried out using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 3.2mm；
D, bevel：Double V-groove is opened steel pipe with lathe and boring and milling machine, and bevel angle is 55 °, and root face is 1.2mm；
B, weld preheating：Mother metal is preheated using Electric heating, preheating speed is 80 DEG C/h, preheating temperature is
150, reach constant temperature 120min after preheating temperature；
C, control interlayer temperature：Using being heated up using Electric heating, thermometric is carried out using infrared thermometer, controlled
Welding temperature processed is welded afterwards at 200 DEG C；
D, welding：Comprise the following steps：
A, envelope backing weld：Gas tungsten arc welding is adopted with the speed of welding of 42mm/min and
The intake velocity of 9L/min is welded, welding current 90A, weldingvoltage 10V, heat input 1.3KJ/mm；
B, packed layer welding：Adopt manual electric arc welding and welded with the speed of welding of 50mm/min, welding current 70A,
Weldingvoltage 18V, heat input 1.5KJ/mm；
C, the welding of capping layer：Adopt manual electric arc welding and welded with the speed of welding of 70mm/min, welding current 115A,
Weldingvoltage 18V, heat input 1.3KJ/mm；
E, post weld heat treatment：Weldment is first lowered the temperature, is heated up afterwards, then constant temperature, then the mode lowered the temperature is heat-treated.
In the present embodiment, heat treatment method is comprised the following steps in step E：
A, weldment is carried out into Slow cooling with the speed of 90 DEG C/h, until constant temperature 1h after temperature is down to 100 DEG C；
B, weldment heated by electrically heated mode again, heated up with the speed of 90 DEG C/h, risen to 750 DEG C
Constant temperature 4h afterwards；
C, weldment carried out with the speed of 90 DEG C/h slowly cooling to 300 DEG C again, normal temperature is naturally cooled to afterwards.
Embodiment two：
A kind of 350MW Main Steam Pipeline of Unit-P91 welding procedures, comprise the following steps：
A, welding preparation：
A, back cover layer：Back cover welding is carried out using gas tungsten arc welding, welding material is MTS3 welding wires, and welding wire is advised
Lattice are φ 2.4mm；
B, packed layer：Layer welding is filled using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 2.5mm；
C, capping layer：Capping layer welding is carried out using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 3.2mm；
D, bevel：Double V-groove is opened steel pipe with lathe and boring and milling machine, and bevel angle is 65 °, blunt
While being 1.5mm；
B, weld preheating：Mother metal is preheated using Electric heating, preheating speed is 100 DEG C/h, preheating temperature is
200 DEG C, reach constant temperature 150min after preheating temperature；
C, control interlayer temperature：Using being heated up using Electric heating, thermometric is carried out using infrared thermometer, controlled
Welding temperature processed is welded afterwards at 300 DEG C；
D, welding：Comprise the following steps：
A, envelope backing weld：The entering with the speed of welding of 57mm/min and 11L/min that adopt gas tungsten arc welding
Gas speed is welded, welding current 110A, weldingvoltage 16V, heat input 1.7KJ/mm；
B, packed layer welding：Adopt manual electric arc welding and welded with the speed of welding of 60mm/min, welding current 90A,
Weldingvoltage 20V, heat input 1.8KJ/mm；
C, the welding of capping layer：Adopt manual electric arc welding and welded with the speed of welding of 80mm/min, welding current 125A,
Weldingvoltage 20V, heat input 2.0KJ/mm；
E, post weld heat treatment：Weldment is first lowered the temperature, is heated up afterwards, then constant temperature, then the mode lowered the temperature is heat-treated.
In the present embodiment, heat treatment method is comprised the following steps in step E：
A, weldment is carried out into Slow cooling with the speed of 100 DEG C/h, until constant temperature 1h after temperature is down to 120 DEG C；
B, weldment heated by electrically heated mode again, heated up with the speed of 100 DEG C/h, risen to 770
Constant temperature 4h after DEG C；
C, weldment carried out with the speed of 100 DEG C/h slowly cooling to 300 DEG C again, normal temperature is naturally cooled to afterwards.
Embodiment three：
A kind of 350MW Main Steam Pipeline of Unit-P91 welding procedures, comprise the following steps：
A, welding preparation：
A, back cover layer：Back cover welding is carried out using gas tungsten arc welding, welding material is MTS3 welding wires, and welding wire is advised
Lattice are φ 2.4mm；
B, packed layer：Layer welding is filled using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 2.5mm；
C, capping layer：Capping layer welding is carried out using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 3.2mm；
D, bevel：Double V-groove is opened steel pipe with lathe and boring and milling machine, and bevel angle is 58 °, and root face is 1.3mm；
B, weld preheating：Mother metal is preheated using Electric heating, preheating speed is 85 DEG C/h, preheating temperature is
180 DEG C, reach constant temperature 130min after preheating temperature；
C, control interlayer temperature：Using being heated up using Electric heating, thermometric is carried out using infrared thermometer, controlled
Welding temperature processed is welded afterwards at 240 DEG C；
D, welding：Comprise the following steps：
A, envelope backing weld：Gas tungsten arc welding is adopted with the air inlet of the speed of welding of 50mm/min and 9L/min
Speed is welded, welding current 95A, weldingvoltage 12V, heat input 1.4KJ/mm；
B, packed layer welding：Adopt manual electric arc welding and welded with the speed of welding of 54mm/min, welding current 75A,
Weldingvoltage 18V, heat input 1.6KJ/mm；
C, the welding of capping layer：Adopt manual electric arc welding and welded with the speed of welding of 74mm/min, welding current 122A,
Weldingvoltage 18V, heat input 1.5KJ/mm；
E, post weld heat treatment：Weldment is first lowered the temperature, is heated up afterwards, then constant temperature, then the mode lowered the temperature is heat-treated.
In the present embodiment, heat treatment method is comprised the following steps in step E：
A, weldment is carried out into Slow cooling with the speed of 95 DEG C/h, until constant temperature 1h after temperature is down to 105 DEG C；
B, weldment heated by electrically heated mode again, heated up with the speed of 95 DEG C/h, risen to 750
Constant temperature 4h after DEG C -770 DEG C；
C, weldment carried out with the speed of 95 DEG C/h slowly cooling to 300 DEG C again, normal temperature is naturally cooled to afterwards.
Example IV：
A kind of 350MW Main Steam Pipeline of Unit-P91 welding procedures, comprise the following steps：
A, welding preparation：
A, back cover layer：Back cover welding is carried out using gas tungsten arc welding, welding material is MTS3 welding wires, and welding wire is advised
Lattice are φ 2.4mm；
B, packed layer：Layer welding is filled using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 2.5mm；
C, capping layer：Capping layer welding is carried out using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod is advised
Lattice are φ 3.2mm；
D, bevel：Double V-groove is opened steel pipe with lathe and boring and milling machine, and bevel angle is 60 °, and root face is 1.2mm-
1.5mm；
B, weld preheating：Mother metal is preheated using Electric heating, preheating speed is 90 DEG C/h, preheating temperature is
180 DEG C, reach constant temperature 135min after preheating temperature；
C, control interlayer temperature：Using being heated up using Electric heating, thermometric is carried out using infrared thermometer, controlled
Welding temperature processed is welded afterwards at 250 DEG C；
D, welding：Comprise the following steps：
A, envelope backing weld：The entering with the speed of welding of 50mm/min and 10L/min that adopt gas tungsten arc welding
Gas speed is welded, welding current 100A, weldingvoltage 13V, heat input 1.5KJ/mm；
B, packed layer welding：Adopt manual electric arc welding and welded with the speed of welding of 55mm/min, welding current 80A,
Weldingvoltage 19V, heat input 1.7KJ/mm；
C, the welding of capping layer：Adopt manual electric arc welding and welded with the speed of welding of 75mm/min, welding current 120A,
Weldingvoltage 19V, heat input 1.5KJ/mm；
E, post weld heat treatment：Weldment is first lowered the temperature, is heated up afterwards, then constant temperature, then the mode lowered the temperature is heat-treated.
In the present embodiment, heat treatment method is comprised the following steps in step E：
A, weldment is carried out into Slow cooling with the speed of 100 DEG C/h, until constant temperature 1h after temperature is down to 110 DEG C；
B, weldment heated by electrically heated mode again, heated up with the speed of 95 DEG C/h, risen to 760 DEG C
Constant temperature 4h afterwards；
C, weldment carried out with the speed of 95 DEG C/h slowly cooling to 300 DEG C again, normal temperature is naturally cooled to afterwards.
Experimental example：
By three groups of test test specimen point to be welded, per group of 6 test specimens, each test specimen is taken different in various embodiments of the present invention
Welding method, preheating temperature, welding parameter, Technology for Heating Processing and welding operation personnel, determine weld hardness, heat affecting after welding
Area's hardness and mother metal hardness, data measured such as following table：
The main steam line welding procedure even weld of the present invention is attractive in appearance, and shaping is good, can improve welding and connect
The performance of head impact flexibility, welding fragility, post weld heat treatment and welding heat affected zone, improves
Boiler and pipeline service life.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can carry out various changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention be defined by the appended.
Claims (2)
1. a kind of 350MW Main Steam Pipeline of Unit-P91 welding procedures, it is characterised in that：Comprise the following steps：
A, welding preparation：
A, back cover layer：Back cover welding is carried out using gas tungsten arc welding, welding material is MTS3 welding wires, and welding wire specification is
φ2.4mm；
B, packed layer：Layer welding is filled using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod specification is
φ2.5mm；
C, capping layer：Capping layer welding is carried out using manual electric arc welding, welding material is Chromo T91 welding rods, and welding rod specification is
φ3.2mm；
D, bevel：Double V-groove is opened steel pipe with lathe and boring and milling machine, and bevel angle is 55 ° -65 °, and root face is 1.2mm-
1.5mm；
E, back filled argon protection, prevent the oxidation of sealing run；
B, weld preheating：Mother metal is preheated using Electric heating, preheating speed is 100 DEG C/h-150 DEG C/h, preheating is warm
Spend for 150-200 DEG C, reach constant temperature 120min-150min after preheating temperature；
C, control interlayer temperature：Using being heated up using Electric heating, thermometric, control weldering are carried out using infrared thermometer
Jointing temp is welded afterwards at 200 DEG C -300 DEG C；
D, welding：Comprise the following steps：
A, envelope backing weld：Gas tungsten arc welding is adopted with the speed of welding and 9-11L/ of 42mm/min-57mm/min
The gas flow of min is welded, welding current 90-110A, weldingvoltage 10-16V, heat input 1.3-1.7KJ/mm；
B, packed layer welding：Adopt manual electric arc welding and welded with the speed of welding of 50mm/min-60mm/min, welding current
70-90A, weldingvoltage 18-20V, heat input 1.5-1.8KJ/mm；
C, the welding of capping layer：Adopt manual electric arc welding and welded with the speed of welding of 70-80mm/min, welding current 115-
125A, weldingvoltage 18-20V, heat input 1.3-2.0KJ/mm；
E, post weld heat treatment：Weldment is first lowered the temperature, is heated up afterwards, then constant temperature, then the mode lowered the temperature is heat-treated.
2. a kind of 350MW Main Steam Pipeline of Unit-P91 welding procedures according to claim 1, it is characterised in that：It is described
Heat treatment method is comprised the following steps in step E：
A, weldment is carried out into Slow cooling with the speed of 100 DEG C/h-150 DEG C/h, until permanent after temperature is down to 100 DEG C -120 DEG C
Warm 1h；
B, weldment heated by electrically heated mode again, heated up with the speed of 100 DEG C/h-150 DEG C/h, risen to
Constant temperature 4h after 750 DEG C -770 DEG C；
C, weldment carried out with the speed of 100 DEG C/h-150 DEG C/h slowly cooling to 300 DEG C again, naturally cooled to afterwards often
Temperature.
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| CN201611272669.1A CN106624285A (en) | 2016-12-29 | 2016-12-29 | 350 MW unit main steam pipeline-P91 welding process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108176911A (en) * | 2017-12-18 | 2018-06-19 | 南京德邦金属装备工程股份有限公司 | A kind of P91 materials welding and heat treatment method |
| CN108825299A (en) * | 2018-05-30 | 2018-11-16 | 贵州锦丰矿业有限公司 | A kind of movable type filling pipeline device and construction method |
| 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 |
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| 严祯荣等: "超(超)临界锅炉用厚壁SA335-P91钢管的高效率焊接方法", 《中国特种设备安全》 * |
| 孙咸: "工艺方法欲改进,焊接材料需出新(下)――T91/P91钢焊接材料应用述评", 《金属加工(热加工)》 * |
| 张国栋等: "基于正交试验设计的高温管道焊接工艺优化", 《焊接学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108176911A (en) * | 2017-12-18 | 2018-06-19 | 南京德邦金属装备工程股份有限公司 | A kind of P91 materials welding and heat treatment method |
| CN108825299A (en) * | 2018-05-30 | 2018-11-16 | 贵州锦丰矿业有限公司 | A kind of movable type filling pipeline device and construction method |
| 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 |
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