CN106670738A - Welding technique of G115 steel used for boiler pipelines - Google Patents

Welding technique of G115 steel used for boiler pipelines Download PDF

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Publication number
CN106670738A
CN106670738A CN201610998356.8A CN201610998356A CN106670738A CN 106670738 A CN106670738 A CN 106670738A CN 201610998356 A CN201610998356 A CN 201610998356A CN 106670738 A CN106670738 A CN 106670738A
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China
Prior art keywords
welding
steel
arc welding
pipelines
welded
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Granted
Application number
CN201610998356.8A
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Chinese (zh)
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CN106670738B (en
Inventor
陈亮
李刚
卢征然
陆文龙
王炯祥
傅育文
王哮江
田国平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Electric Power Co Ltd
Shanghai Boiler Works Co Ltd
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Jiangsu Electric Power Co Ltd
Shanghai Boiler Works Co Ltd
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Application filed by Jiangsu Electric Power Co Ltd, Shanghai Boiler Works Co Ltd filed Critical Jiangsu Electric Power Co Ltd
Priority to CN201610998356.8A priority Critical patent/CN106670738B/en
Publication of CN106670738A publication Critical patent/CN106670738A/en
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    • 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
    • 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
    • B23K9/235—Preliminary treatment

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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 welding technique of G115 steel used for boiler pipelines. The welding technique is characterized by comprising the following steps that the pipelines are prepared from G115 novel martensitic heat-resistant steel supplied in the normalized condition and the tempering condition; beveled edges are prepared in the two pipelines needing to be welded correspondingly, through polishing, the beveled edges and the two sides of the inner walls and the outer walls of the beveled edges are cleared, and then the two pipelines needing to be welded are subjected to aligned assembly; manual argon arc welding and manual electric-arc welding are adopted to conduct welding; and after butt girth welding is conducted, heat treatment is conducted at the temperature of 760-780 DEG C, and the heat preservation time is seven hours or more. According to the welding technique of the G115 steel used for the boiler pipelines, the problems that which welding material is adopted for welding of the G115 steel and how heat treatment is conducted after the G115 steel is welded are solved, and the welding technique of the G115 novel martensitic heat-resistant steel is completely provided and has great significance for reference on solving the welding problem of the same martensitic heat-resistant steel.

Description

The boiler tubing welding procedure of G115 steel
Technical field
The present invention relates to a kind of unit parameter is the ultra-supercritical boiler pipeline of 630 DEG C and the above with selecting novel martensitic The field-installed welding procedure of G115 steel.
Background technology
G115 is the 9Cr-3W-3Co novel martensitic heat resisting steel of Beijing Iron and Steel Research Geueral Inst exploitation, and its is lasting at 650 DEG C Intensity is approximately 1.4 times of P92 steel, and its high temperature resistance steam oxidation performance is suitable with P92 steel, and its 650 DEG C of creep rupture strengths are better than Japan The P93 steel of Sumitomo exploitation.G115 materials can meet the service demand at 650 DEG C, be very potential to become 630 DEG C to 650 DEG C temperature Degree section boiler tubing steel.
At present, 630 DEG C of ultra-supercritical boilers candidate heat resisting steel SAVE12AD that in the world same type SUMITOMO CHEMICAL is developed Welding also there are some yet unresolved issues, the welding of SAVE12AD materials is recommended in the world using Gr.92 grades or nickel Base wlding is welded, and the creep rupture strength of welding point is less than use requirement of the relevant criterion to mother metal.Therefore, use and mother metal The new wlding of matching, develops the welding procedure of the field-installed all positon docking of boiler tubing G115 novel martensitic steel to solution The Welding Problems of certainly similar martensite heat-resistant steel have greatly reference and reference.
The content of the invention
Present invention seek to address that 630 DEG C and above ultra-supercritical boiler are difficult with the welding of candidate novel martensitic steel G115 Topic, is that 630 DEG C and above ultra-supercritical boiler provide a kind of new welding procedure with the welding of candidate novel martensitic steel G115.
In order to achieve the above object, the technical scheme is that there is provided a kind of Welder of boiler tubing G115 steel Skill, it is characterised in that comprise the following steps：
Step 1, the G115 novel martensitic heat resisting steel supplied using normalizing state and tempering state prepare pipeline；
Step 2, prepare on two pipelines that need to be welded groove respectively, and to groove and internal and external walls both sides with polish into Row cleaning, the pipeline that subsequently need to weld two carries out boil on the nape opposite the mouth assembling；
Step 3, welded using manual argon arc welding and manual electric arc welding, from the 9Cr-3W- of 3.2~4.0mm of diameter 3Co heat resistant steel electrodes, and manual argon arc welding is from the 9Cr-3W-3Co heat resisting steel strip welding wires of diameter 2.4mm；
After step 4, docking circular seam welding, heat treatment temperature retention time is more than more than 7h at 760~780 DEG C.
Preferably, when the manual argon arc welding and manual electric arc welding is carried out, pipeline outer wall protective gas adopts 100%Ar Protected, outer wall shield gas flow rate is 6~12L/min, inner-walls of duct (back side) protective gas is carried on the back using 100%Ar Face is protected, and backing gas flow is 5~8L/min, and purity of argon is more than 99.95%.
Preferably, during manual electric arc welding, using multi-pass welding, carry out per welding slag side is thoroughly removed after being soldered together It is lower to weld together, interlayer temperature is controlled during welding and is less than 300 DEG C, amplitude of fluctuation is welded less than welding rod electrode size 3 times.
Preferably, during manual electric arc welding, after being often soldered together grinder buffing is used.
The present invention has the advantages that：
G115 steel is welded using which kind of welding material and complete welding procedure does not also have, and the present invention solves G115 Problem that steel is welded using which kind of welding material and G115 steel postwelding how problem of heat treatment, and be intactly proposed The welding procedure of G115 novel martensitic heat resisting steel, the Welding Problems to solving similar martensite heat-resistant steel have greatly reference And reference.
Specific embodiment
To become apparent the present invention, hereby it is described in detail below with preferred embodiment.
The invention provides a kind of boiler tubing welding procedure of G115 steel, comprises the following steps：
Step 1, the G115 novel martensitic heat resisting steel supplied using normalizing+tempering state prepare pipeline.
Step 2, welding preparation：1. groove is prepared, and groove and internal and external walls both sides is cleared up with polishing；2. by two The pipeline that root need to be welded carries out boil on the nape opposite the mouth assembling.
Step 3, welded using manual argon arc welding+manual electric arc welding (GTAW+SMAW), from the 9Cr- of Φ 2.4mm The 9Cr-3W-3Co heat resistant steel electrodes of 3W-3Co heat resisting steel strip welding wire (GTAW), Φ 3.2~Φ 4.0mm.Manual argon arc welding+handss Work arc welding (GTAW+SMAW) welding procedure is as follows：
1. pipeline outer wall protective gas is protected using 100%Ar, and outer wall shield gas flow rate is 6~12L/min, is managed Inwall (back side) protective gas in road carries out back-protective using 100%Ar, and backing gas flow is 5~8L/min, argon Purity is more than 99.95%；
Welding variables when 2. welding is shown in Table 1
The welding condition of the G115 steel of table 1
Welding procedure Specification (mm) Electric current (A) Voltage (V) Preheating temperature (DEG C)
GTAW Φ2.4 100~120 12~15 ≥100
SMAW Φ3.2 90~120 22~26 ≥200
SMAW Φ4.0 160~170 22~27 ≥200
3. using in SMAW welding processes, using multi-pass welding, per needing thoroughly to remove welding slag after being soldered together and can carry out down Weld together, if necessary with grinder buffing, interlayer temperature is controlled during welding and is less than 300 DEG C；Using during manual electric arc welding, Welding amplitude of fluctuation is less than 3 times of welding rod electrode size.
Using the specification of heat treatment of 760~780 DEG C × 7h after step 4, docking circular seam welding.

Claims (4)

1. a kind of boiler tubing welding procedure of G115 steel, it is characterised in that comprise the following steps：
Step 1, the G115 novel martensitic heat resisting steel supplied using normalizing state and tempering state prepare pipeline；
Step 2, groove is prepared on two pipelines that need to be welded respectively, and groove and internal and external walls both sides are carried out clearly with polishing Reason, the pipeline that subsequently need to weld two carries out boil on the nape opposite the mouth assembling；
Step 3, welded using manual argon arc welding and manual electric arc welding, it is resistance to from the 9Cr-3W-3Co of 3.2~4.0mm of diameter Hot steel electrode, and manual argon arc weldingFrom the 9Cr-3W-3Co heat resisting steel strip welding wires of diameter 2.4mm；
After step 4, docking circular seam welding, heat treatment temperature retention time is more than more than 7h at 760~780 DEG C.
2. a kind of boiler tubing as claimed in claim 1 welding procedure of G115 steel, it is characterised in that carrying out the handss When work argon arc welding and manual electric arc welding, pipeline outer wall protective gas is protected using 100%Ar, and outer wall shield gas flow rate is 6~12L/min, inner-walls of duct (back side) protective gas carries out back-protective using 100%Ar, and backing gas flow is 5 ~8L/min, purity of argon is more than 99.95%.
3. a kind of boiler tubing as claimed in claim 1 welding procedure of G115 steel, it is characterised in that manual electric arc welding Cheng Zhong, using multi-pass welding, per welding slag side is thoroughly removed after being soldered together welding together, key-course during welding is carried out down Between temperature be less than 300 DEG C, weld amplitude of fluctuation less than 3 times of welding rod electrode size.
4. a kind of boiler tubing as claimed in claim 3 welding procedure of G115 steel, it is characterised in that manual electric arc welding Cheng Zhong, after being often soldered together grinder buffing is used.
CN201610998356.8A 2016-11-14 2016-11-14 The welding procedure of boiler tubing G115 steel Active CN106670738B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610998356.8A CN106670738B (en) 2016-11-14 2016-11-14 The welding procedure of boiler tubing G115 steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610998356.8A CN106670738B (en) 2016-11-14 2016-11-14 The welding procedure of boiler tubing G115 steel

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CN106670738B CN106670738B (en) 2019-08-02

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107570838A (en) * 2017-10-27 2018-01-12 北京奥林匹亚锅炉有限公司 A kind of boiler corrugated inner liner welding procedure
CN109514046A (en) * 2018-12-17 2019-03-26 陕西化建工程有限责任公司 A kind of Ni-based separation layer equipment mouth of band and heat resisting steel pipeline butt welding process
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
CN109865955A (en) * 2019-03-05 2019-06-11 哈尔滨锅炉厂有限责任公司 The welding method that G115 large-diameter pipe hand tungsten argon arc welding and welding electrode arc welding combine
CN109877438A (en) * 2019-03-27 2019-06-14 四川工程职业技术学院 A kind of 9Cr-3W-3Co material welding method
CN109877424A (en) * 2019-03-22 2019-06-14 哈尔滨锅炉厂有限责任公司 G115 small-bore pipe heating wire TIG welding method
CN111136398A (en) * 2020-01-02 2020-05-12 中国神华能源股份有限公司国华电力分公司 Boiler pipeline butt welding process
CN111843284A (en) * 2020-07-07 2020-10-30 武汉大学 Welding wire for 9Cr-3W-3Co martensite heat-resistant steel and application of welding wire in GTAW welding process
CN111992855A (en) * 2020-09-02 2020-11-27 中国电建集团山东电力建设第一工程有限公司 Welding and combined heat treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline
CN112846466A (en) * 2020-12-31 2021-05-28 大唐郓城发电有限公司 Narrow gap welding process of G115 steel

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107570838B (en) * 2017-10-27 2020-02-07 北京奥林匹亚锅炉有限公司 Welding process for corrugated inner container of boiler
CN107570838A (en) * 2017-10-27 2018-01-12 北京奥林匹亚锅炉有限公司 A kind of boiler corrugated inner liner welding procedure
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
CN109514046A (en) * 2018-12-17 2019-03-26 陕西化建工程有限责任公司 A kind of Ni-based separation layer equipment mouth of band and heat resisting steel pipeline butt welding process
CN109865955A (en) * 2019-03-05 2019-06-11 哈尔滨锅炉厂有限责任公司 The welding method that G115 large-diameter pipe hand tungsten argon arc welding and welding electrode arc welding combine
CN109865955B (en) * 2019-03-05 2021-11-16 哈尔滨锅炉厂有限责任公司 Welding method combining manual tungsten electrode argon arc welding and shielded metal arc welding for G115 large-diameter pipe
CN109877424A (en) * 2019-03-22 2019-06-14 哈尔滨锅炉厂有限责任公司 G115 small-bore pipe heating wire TIG welding method
CN109877438A (en) * 2019-03-27 2019-06-14 四川工程职业技术学院 A kind of 9Cr-3W-3Co material welding method
CN111136398A (en) * 2020-01-02 2020-05-12 中国神华能源股份有限公司国华电力分公司 Boiler pipeline butt welding process
CN111843284A (en) * 2020-07-07 2020-10-30 武汉大学 Welding wire for 9Cr-3W-3Co martensite heat-resistant steel and application of welding wire in GTAW welding process
CN111992855A (en) * 2020-09-02 2020-11-27 中国电建集团山东电力建设第一工程有限公司 Welding and combined heat treatment method for martensite heat-resistant steel G115 large-diameter thick-wall pipeline
CN112846466A (en) * 2020-12-31 2021-05-28 大唐郓城发电有限公司 Narrow gap welding process of G115 steel

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