CN108340051A - The assembled welding process of P92 heat resisting steel - Google Patents
The assembled welding process of P92 heat resisting steel Download PDFInfo
- Publication number
- CN108340051A CN108340051A CN201710046379.3A CN201710046379A CN108340051A CN 108340051 A CN108340051 A CN 108340051A CN 201710046379 A CN201710046379 A CN 201710046379A CN 108340051 A CN108340051 A CN 108340051A
- Authority
- CN
- China
- Prior art keywords
- welding
- argon
- er90s
- weld
- wires
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
The invention discloses a kind of assembled welding process of P92 heat resisting steel; in welding when heavy wall P92 pipe butt welds; back side argon filling is carried out using ER90S G welding wires; argon arc weld connection technology; filling and the welding between capping layer, road, using the mixed gas arc welding welding procedure of ER90S G welding wires, argon+carbon dioxide composition.The welding procedure of the present invention both ensure that welding quality, meanwhile in middle big thickness piping butt welding, the scarfing cinder work between filled layer, road also becomes easy, and it can continuously weld, welding point largely reduces, meanwhile, when avoiding welding electrode arc welding, the accumulative waste of bare terminal, and lead to the generation of weld porosity and crackle because of the welding rod long-time scene storage moisture absorption, welding efficiency is greatly improved, welding cost is reduced.
Description
Technical field
The present invention relates to a kind of welding procedure, main application is in the middle thickness that ultra supercritical coal-fired unit material is P92 steel
In the big pipe butt welding of wall, has and be related to a kind of assembled welding process of P92 heat resisting steel.
Background technology
P92 steel is widely used in due to its good corrosion resistance and very high creep rupture strength at high temperatures
In the gigawatt unit of numerous domestic.As a kind of new type steel playing significant role in extra-supercritical unit, P92 steel
Welding procedure also necessarily become and need the project of primary study.
Currently, in fired power generating unit project, middle heavy wall P92 pipe butt welds are all made of the progress of ER90S-G welding wires when welding
Back side argon filling, argon arc welding back cover；E9015-G welding electrode arc welding fills the welding procedure with capping.This assembled welding process, it is main
If the heat source using argon arc welding is concentrated, protecting effect is good, and quality is easy to get guarantee to carry out the back cover of weld seam, recycles behaviour
Make more conveniently stick electrode arc welding come the welding that is filled between capping layer, road.But this welding method is used to have
There is the following insufficient：
（1）Welding rod has to pass through 350 DEG C of drying before weldering, and constant temperature is stored in on-demand in heat-preservation cylinder after 1-2 hours, and make
It must be dried again with more than four hours, repeatedly drying number generally must not exceed secondary, to increase power consumption, wave
Take welding material；
（2）Bare terminal can not use the waste for causing wlding；
（3）Scarfing cinder is more difficult between welding electrode arc welding filled layer, road, inefficiency；
（4）It needs frequently to replace welding rod in welding process, increases welding point quantity, influence U.S. of welding quality and appearance of weld
It sees；
（5）Same weldment, because welding rod deposition efficiency is relatively low, it is desirable that welder's stream time is relatively long, increases welder
Labor intensity, meanwhile, extend the build date of product, expend a large amount of human and material resources and electric power resource.
Invention content
Technical problem to be solved by the invention is to provide a kind of solution fired power generating unit, material is that the middle heavy wall of P92 steel is big
The weld defect that pipe is likely to occur in butt welding, and construction cost is reduced, welding quality and welding efficiency etc. are improved, satisfaction is set
The assembled welding process of the P92 heat resisting steel of the working condition of standby normal operation.
In order to solve the above technical problems, the present invention provides a kind of assembled welding process of P92 heat resisting steel, the heavy wall in welding
When P92 pipe butt welds, using ER90S-G welding wires carry out back side argon filling, argon arc weld connection technology, filling with capping layer,
Welding between road, using the mixed gas arc welding welding procedure of ER90S-G welding wires, argon+carbon dioxide composition, it is characterised in that
Include the following steps：
1）(P92 steel alloys content belongs to high-alloy steel 10% or more, although should for the preheating of 200 DEG C -250 DEG C of the progress before weldering
C, S, P content are relatively low in the alloy composition of steel, but there are still certain cold crack tendencies, and therefore, P92 steel must be taken when welding
Preheating step.But from the point of view of joint quality, preheating temperature is excessively high, then grain boundary carbide can be caused to precipitate and formed iron within a fitting
Ferritic, it is very unfavorable to toughness, and after carbide precipitation+formation ferritic structure is formed, it is necessary to carry out modifier treatment ability
Effectively solved.It was verified that carrying out 200 DEG C -250 DEG C of preheating before weldering, temperature control is at 150 DEG C -200 between layer, road
DEG C, you can it effectively prevent the generation of welding cold cracking)；
2）The back cover that weld seam is carried out using argon arc welding welds (displacement of back side argon filling), and quality is easy to get guarantee；
3) 85% argon gas, 15% carbon dioxide is recycled to form gaseous mixture as welding protection gas (experiments have shown that carbon dioxide
In 15%-20%, " hydrogen " stomata can substantially eliminate content) welding methods of+ER90S-G solid core welding wires is filled and capping
The welding of layer；
4）Postwelding is air-cooled to 80 DEG C -100 DEG C (this temperature is the martensite transformation temperature of such steel), and keeps the temperature 1-2 hours, waits for
The crystalline phase tissue of P92 steel be completely reformed into after martensite carry out in time 750 DEG C -760 DEG C (in this temperature range, P92 steel welding
The post weld heat treatment of connector could obtain the impact toughness of good comprehensive performance, especially weld seam) postwelding disappears and should be heat-treated
Process.
Further, small thermal weld stress is taken in welding process as possible, (P92 steel exists the thin layer welding of multilayer multiple tracks
There is obvious timeliness to be inclined within the scope of 500 DEG C -650 DEG C, in ag(e)ing process, the alloying elements such as Cr, W, Mo and Fe, Mn, Si
Intermetallic compound Laves phases are formed, impact flexibility can be caused to deteriorate；Meanwhile the excellent base material performance of supply of material state is welded
The high temperature circulation connect, base material heat affected area performance must be deteriorated obviously, and degradation by with the increase of thermal weld stress and
Aggravation.Therefore in the welding process it should be specifically noted that the control of thermal weld stress).
Compared with prior art, beneficial effects of the present invention are：
1）Gas protection wire is not required to drying and heat preservation, saves electric energy；
2）Gas shielded welds compared with former stick electrode arc welding, without bare terminal residue discard electrode, saves wlding resource, keeps away
Exempt to waste, reduces cost；
3）Gas shielded welds no too many welding slag, and welder's scarfing cinder is light, and spatter is less, is conducive to the next procedure that circulates；
4）Gas shielded weldering welding point quantity significantly reduces, and appearance of weld is beautiful；
5）Working efficiency is the 200% of stick electrode arc welding, that is to say, that the pipe clamp of a diameter 1000mm-1200mm, welding rod
Arc welding needs -2.5 days 2 days could weld completion, using this welding procedure, can be soldered within general 1 day.Not only mitigate welder's
Labor intensity, and the manufacturing cycle of production is greatly shortened, the cost of effectively save welding production；
6）Because gas shielded arc welding can work continuously, reduces the necessary drying of welding rod and receive number, and because weld interval
It is shorter, the time of heat preservation welding and the input of Transport Machinery equipment is greatly reduced, reduces the auxiliary of electric energy and mechanical equipment.
Specific implementation mode
Embodiment 1：
A kind of assembled welding process of P92 heat resisting steel, in welding when heavy wall P92 pipe butt welds, using ER90S-G welding wires into
Row back side argon filling, argon arc weld connection technology, filling and the welding between capping layer, road, using ER90S-G welding wires, argon+dioxy
The mixed gas arc welding welding procedure for changing carbon composition, includes the following steps：
1）(P92 steel alloys content belongs to high-alloy steel 10% or more, although should for the preheating of 200 DEG C -250 DEG C of the progress before weldering
C, S, P content are relatively low in the alloy composition of steel, but there are still certain cold crack tendencies, and therefore, P92 steel must be taken when welding
Preheating step.But from the point of view of joint quality, preheating temperature is excessively high, then grain boundary carbide can be caused to precipitate and formed iron within a fitting
Ferritic, it is very unfavorable to toughness, and after carbide precipitation+formation ferritic structure is formed, it is necessary to carry out modifier treatment ability
Effectively solved.It was verified that carrying out 200 DEG C -250 DEG C of preheating before weldering, temperature control is at 150 DEG C -200 between layer, road
DEG C, you can it effectively prevent the generation of welding cold cracking)；
2）The back cover that weld seam is carried out using argon arc welding welds (displacement of back side argon filling), and quality is easy to get guarantee；
3) 85% argon gas, 15% carbon dioxide is recycled to form gaseous mixture as welding protection gas (experiments have shown that carbon dioxide
In 15%-20%, " hydrogen " stomata can substantially eliminate content) welding methods of+ER90S-G solid core welding wires is filled and capping
The welding of layer；
4）Postwelding is air-cooled to 80 DEG C -100 DEG C (this temperature is the martensite transformation temperature of such steel), and keeps the temperature 1-2 hours, waits for
The crystalline phase tissue of P92 steel be completely reformed into after martensite carry out in time 750 DEG C -760 DEG C (in this temperature range, P92 steel welding
The post weld heat treatment of connector could obtain the impact toughness of good comprehensive performance, especially weld seam) postwelding disappears and should be heat-treated
Process.
In conclusion the welding procedure of the present invention both ensure that welding quality, meanwhile, in middle big thickness piping butt welding,
Scarfing cinder work between filled layer, road also becomes easy, and can continuously weld, and welding point largely reduces, meanwhile, it avoids
When welding electrode arc welding, the accumulative waste of bare terminal, and cause because of the welding rod long-time scene storage moisture absorption weld porosity with
The generation of crackle greatly improves welding efficiency, reduces welding cost.
The foregoing is merely the better embodiment of the present invention, protection scope of the present invention is not with the above embodiment
Limit, as long as those of ordinary skill in the art should all be included in power according to equivalent modification or variation made by disclosed content
Protection domain described in sharp claim.
Claims (2)
1. a kind of assembled welding process of P92 heat resisting steel, in welding when heavy wall P92 pipe butt welds, using ER90S-G welding wires
Back side argon filling, argon arc weld connection technology, filling and the welding between capping layer, road are carried out, using ER90S-G welding wires, argon+two
The mixed gas arc welding welding procedure of carbonoxide composition, it is characterised in that include the following steps：
1）200 DEG C -250 DEG C of preheating is carried out before weldering；
2）The back cover that weld seam is carried out using argon arc welding is welded；
3) weldering of 85% argon gas, 15% carbon dioxide composition gaseous mixture as welding protection gas+ER90S-G solid core welding wires is recycled
Method is connect to be filled the welding with capping layer；
4）Postwelding is air-cooled to 80 DEG C -100 DEG C, and keeps the temperature 1-2 hours, after the crystalline phase tissue of P92 steel is completely reformed into martensite
750 DEG C of -760 DEG C of postweldings of progress, which disappear, in time answers process of thermal treatment method.
2. according to a kind of assembled welding process of P92 heat resisting steel shown in claim 1, it is characterised in that：In welding process to the greatest extent
Amount takes small thermal weld stress, the thin layer welding of multilayer multiple tracks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710046379.3A CN108340051A (en) | 2017-01-22 | 2017-01-22 | The assembled welding process of P92 heat resisting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710046379.3A CN108340051A (en) | 2017-01-22 | 2017-01-22 | The assembled welding process of P92 heat resisting steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108340051A true CN108340051A (en) | 2018-07-31 |
Family
ID=62974506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710046379.3A Pending CN108340051A (en) | 2017-01-22 | 2017-01-22 | The assembled welding process of P92 heat resisting steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108340051A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109317787A (en) * | 2018-11-14 | 2019-02-12 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of steel conduit all positon narrow gap TIG automatic 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101112739A (en) * | 2007-08-31 | 2008-01-30 | 北京工业大学 | P92 steel all position welding gas-protection flux-cored wire |
| CN101259562A (en) * | 2008-03-20 | 2008-09-10 | 浙江盛达铁塔有限公司 | Welding technique for rolled steel |
| CN105420638A (en) * | 2015-11-20 | 2016-03-23 | 钢铁研究总院 | Heat-resisting alloy for 700-DEG C ultra-supercritical boiler water-cooling wall and tubing manufacturing method |
-
2017
- 2017-01-22 CN CN201710046379.3A patent/CN108340051A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101112739A (en) * | 2007-08-31 | 2008-01-30 | 北京工业大学 | P92 steel all position welding gas-protection flux-cored wire |
| CN101259562A (en) * | 2008-03-20 | 2008-09-10 | 浙江盛达铁塔有限公司 | Welding technique for rolled steel |
| CN105420638A (en) * | 2015-11-20 | 2016-03-23 | 钢铁研究总院 | Heat-resisting alloy for 700-DEG C ultra-supercritical boiler water-cooling wall and tubing manufacturing method |
Non-Patent Citations (2)
| Title |
|---|
| 中国电力建设企业协会: "《中国电力建设工法汇编 2009年 上册》", 31 October 2009 * |
| 梅强等: "SA335_P91钢管CO_2气体保护焊焊接工艺的研究", 《化工之友》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109317787A (en) * | 2018-11-14 | 2019-02-12 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of steel conduit all positon narrow gap TIG automatic 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104759743B (en) | A kind of nickel-based alloy pipe argon arc welding process | |
| CN103521886B (en) | For the welding method of stainless steel single face welding and double face shaping | |
| CN103433603B (en) | The grade of P690QL1 high strength steel mates buried arc welding method by force | |
| CN111266709B (en) | Welding method for improving ultralow-temperature toughness of 304LN austenitic stainless steel submerged-arc welding joint | |
| CN106425104A (en) | One-sided welding double-sided molding welding method for titanium steel composite pipe | |
| CN110076430B (en) | Gas shielded welding method for 1000MPa steel plate with thickness of more than or equal to 40mm | |
| CN104708170A (en) | Q460C steel welding process | |
| CN111283308B (en) | All-position shielded metal arc welding process for ultralow-temperature 304LN austenitic stainless steel medium plate | |
| CN112171109A (en) | Full-automatic submerged-arc welding solid-core welding wire for nickel-saving high-manganese low-temperature steel | |
| CN111230264A (en) | Welding method of MIG welding of 304L austenitic stainless steel | |
| CN109623199B (en) | Consumable electrode gas shielded welding metal powder core flux-cored wire for ultralow-temperature high-manganese steel | |
| CN104070270A (en) | Solder wire submerged-arc welding process for steel resisting atmospheric corrosion in coastal region | |
| CN101229605A (en) | Argon-arc welding for austenitic stainless steel using water cooling welding method | |
| CN112894198A (en) | Self-protection flux-cored wire for ultralow-temperature high-manganese steel | |
| CN108907504B (en) | Metal powder cored flux-cored wire suitable for ultralow-temperature high-manganese steel and welding method | |
| CN101633085B (en) | Stainless steel welding wire and technology for welding same | |
| WO2023273159A1 (en) | Co2 gas shielded welding wire for ultra-low temperature high manganese steel and preparation method | |
| CN108340051A (en) | The assembled welding process of P92 heat resisting steel | |
| CN106378579B (en) | A kind of transmission angle steel tower column foot corrosion damage method for reinforcing | |
| CN109926751B (en) | 314 heat-resistant stainless steel metal core welding wire | |
| CN104690447A (en) | Self-shielded flux-cored wire for 0Cr13 ferrite stainless steel, and preparation method of self-shielded flux-cored wire | |
| CN110576274A (en) | Metal material, process and product for welding high-temperature high-pressure stainless steel pipeline | |
| CN108340052A (en) | The assembled welding process of P91 heat resisting steel | |
| CN110293287A (en) | A kind of welding procedure of superhigh intensity precipitation-hardening stainless steel | |
| CN104002014A (en) | Shielded metal arc welding technology for steel used for resisting to atmospheric corrosion in coastal region |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180731 |