CN1168569C - T91 steel welding process - Google Patents
T91 steel welding process Download PDFInfo
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- CN1168569C CN1168569C CNB021103577A CN02110357A CN1168569C CN 1168569 C CN1168569 C CN 1168569C CN B021103577 A CNB021103577 A CN B021103577A CN 02110357 A CN02110357 A CN 02110357A CN 1168569 C CN1168569 C CN 1168569C
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Abstract
The present invention provides a T91 steel welding technical method which is characterized in that the method comprises the following steps: flux-cored wires are used for render, solid wires are used for filling, welding is carried out by layers, and heat treatment is carried out after welding, wherein the flux core of the flux-cored wires is prepared from 18 to 24 wt% of rutile, 3 to 6 wt% of felspar, 2 to 5 wt% of quartz, 4 to 8 wt% of cryolite, 2 to 10 wt% of marble, 3 to 8 wt% of Ti2O3, 42 to 50 wt% of alloy agents and iron powder as the rest; and the solid wires comprise the following alloying ingredients: 0.08 wt% of C, 0.74 wt% of Ni, 0.13 wt% of Si, 1.01 wt% of Mn, 0.007 wt% of P, 0.007 wt% of S, 0.88 wt% of Mo, 9.06 wt% of Cr and 0.18 wt% of V. The present invention has the technical progress effect that ingredients comprising slagging agents, deoxidizing agents, alloy agents, etc. in the flux-cored wires are used for chemical render. The present invention has the advantages that the inner walls of tubes have the protective function by adopting the solid wires for filling and covering the surface instead of argon, the present invention overcomes the defects of difficult slag removal of the flux-cored wires and low welding speed, the labor intensity is reduced, and the welding speed is accelerated, so the present invention is a fast economical welding method.
Description
Technical field
The present invention relates to a kind of T91 steel welding process, belong to the Steel Tube Special welding technology field.
Background technology
The T91 steel now has been widely used in the superheater and the heat exchanger of power station large-sized boiler; the steel major part is from foreign import; the welding method of T91 steel adopts the solid core welding wire and the welding rod of import more; and pointing out specially need be at " mouth of pipe inwall argon-filled protection ", and list of references is seen " about issuing the notice of T91/P91,15 * 1M1 steel welding technology temporary provisions " and " boiler manufacturing " second phase in 1991 (total the 140th phase) T91/P91 steel pipe introduction.In the installation in power plant, maintenance welding process, there is the shutoff difficulty in this kind process, and the argon filling amount is big, problems such as difficult quality guarantee.
Summary of the invention
The object of the present invention is to provide a kind of use flux-cored wire bottoming (inside pipe wall is argon filling not), argon arc welding wire is filled the welding method of capping.To simplify the welding operation technology difficulty, reduce labor intensity and improve speed of welding.
Technical scheme of the present invention is achieved in that this T91 steel welding process, and its feature is comprising: with the flux-cored wire bottoming, solid core welding wire is filled, layering welding, welding after-baking; Wherein the medicine core proportion of composing of flux-cored wire is (W/W%) rutile 18-24, feldspar 3-6, quartzy 2-5, ice crystal 4-8, marble 2-10, deoxidier Ti
2O
33-8, component ratio are C 0.08, Ni 0.81, Si 0.52, Mn 0.575, P 0.017, S 0.012, Mo 1.05, Cr 9.50, V 0.258, the alloying constituent 42-50 of iron powder surplus; The alloying component of solid core welding wire is C 0.08, Ni 0.74, Si 0.13, Mn 1.01, P 0.007, S 0.007, Mo 0.88, Cr 9.06, V 0.18.
The bevel for welding angle is 27 ° in the described T91 steel welding process, and the mismatch value is less than 1mm.
Selecting the tip diameter for use when also comprising welding in the described T91 steel welding process is φ 10mm, and tungsten bar is φ 2.5mm, and the welding gun argon flow amount is 9-10L/min.
Flux-cored wire backing welding layer thickness should be greater than 3mm in the described T91 steel welding process.
Also comprise 150 ℃ of welding pre-heating temperatures in the described T91 steel welding process, 150 ℃～200 ℃ of interlayer temperatures.
After comprising also in the described T91 steel welding process that the weld seam welding finishes, be cooled to below 120 ℃, carry out post weld heat treatment again.
Post weld heat treatment technology comprises in the described T91 steel welding process:
(1) heating-cooling speed≤250 of post weld heat treatment ℃/h;
(2) heating-up temperature is 760 ℃ ± 10 ℃, and constant temperature time is 2 hours;
When (3) being cooled to 200 ℃, be cooled to room temperature.
Technological progress effect of the present invention shows the chemical characteristic bottoming of compositions such as utilizing slag former in the flux-cored wire, deoxidier, alloying constituent; advantage is that tube wall just can play a protective role without argon filling; and adopt solid core welding wire filling and capping to remedy the difficult and slow deficiency of speed of welding of flux-cored wire scarfing cinder; reducing labor intensity and improve speed of welding and develop simultaneously, is welding method a kind of not only fast but also that economize.
Description of drawings
Fig. 1 is the shape and the size schematic diagram of bevel for welding
Fig. 2 is a sweating heat processing procedure standard curve map
The specific embodiment
Specifically weld example and accompanying drawing below in conjunction with SA213-T91 of the present invention, describe the specific embodiment of the present invention in detail:
T91 steel welding operation method of the present invention is as follows:
1, facility and welding material
(1) welding equipment should be selected the good contravariant welding machine of characteristic for use.
(2) should remove fouls such as surperficial oil, dirt before argon arc welding wire uses.
2, prepare before the weldering
(1) groove preparation
1. groove shape and size are seen figure (1).
Mechanically process when 2. groove prepares.
3. dirts such as rust, oil, dirt are cleaned out in groove and the inside and outside wall both sides 10-15mm scope, expose metallic luster.
(2) counterpart assembling
1. weld bond mismatch value is less than 1mm, and counterpart gap and root face size are as above schemed shown in (one).
It is identical when 2. the wlding of counterpart tack welding and welding procedure are with formal welding.
3, welding procedure
(1) medicine wire bond silk bottoming argon arc welding wire filling, cover welding parameter see Table 1
Table 1 welding condition
| The layer Taoist monastic name | Welding method | Welding rod (silk) | Current range | Voltage range (V) | Speed of welding scope (mm/min) | Other | ||
| Type (board) number | Diameter (mm) | Polarity | Electric current (A) | |||||
| ?1 | ?WS | ?YR91W | ?2.5 | Straight polarity direct current | 80A | ?12V | ?16～18 | |
| ?2 | ?WS | ?TGS-9c ?b | ?2.4 | Straight polarity direct current | 95A | ?12V | ?18～20 | |
| ?3 | ?WS | ?TGS-9c ?b | ?2.4 | Straight polarity direct current | 90A | ?12V | ?18～20 | |
Selecting the tip diameter for use when (2) welding is φ 10mm, and tungsten bar is φ 2.5mm, and the welding gun argon flow amount is 9-10L/min;
(3) flux-cored wire backing welding layer thickness should be not less than 3mm;
(4) preheat temperature is 150 ℃, 150 ℃～200 ℃ of interlayer temperatures; Temperature survey far infrared temperature measurer.
(5) after the weld seam welding finishes, be cooled to below 120 ℃, carry out post weld heat treatment again.
4, post weld heat treatment
(1) heating-cooling speed≤250 of post weld heat treatment ℃/h.
(2) heating-up temperature is 760 ℃ ± 10 ℃, and constant temperature time is 2 hours.
When (3) being cooled to 200 ℃, can not control, be cooled to room temperature.
(4) sweating heat processing procedure standard curve is seen figure (2)
5, mechanical performance index
The mechanical property of welding procedure of the present invention sees Table 2.
Table 2
| Tensile strength (Mpa) | Yield strength (Mpa) | Percentage elongation (%) | Angle of bend (°) | Impact flexibility (J/cm 2) | Hardness HB |
| ≥585 | ≥415 | ≥20 | ≥50 | ≥68 | ≤250 |
The advantage of welding procedure of the present invention is the flux-cored wire bottoming, has solved the problem of argon filling difficulty; Argon arc welding wire is filled, capping layer scarfing cinder amount is less, fills soon than flux-cored wire, and is simple to operate, steady quality.
Flux-cored wire effluent NORTEL power experimental study institute and Beijing University of Technology that the present invention adopts provide.
Claims (7)
1, a kind of T91 steel welding process, its feature is comprising: with the flux-cored wire bottoming, solid core welding wire is filled, layering welding, welding after-baking; Wherein the medicine core proportion of composing of flux-cored wire is (W/W%) rutile 18-24, feldspar 3-6, quartzy 2-5, ice crystal 4-8, marble 2-10, Ti
2O
33-8, component ratio are C 0.08, Ni 0.81, Si 0.52, Mn 0.575, P 0.017, S 0.012, Mo 1.05, Cr 9.50, V 0.258, the alloying constituent 42-50 of iron powder surplus; The alloying component ratio of solid core welding wire is C 0.08, Ni 0.74, Si 0.13, Mn 1.01, P 0.007, S 0.007, Mo 0.88, Cr 9.06, V 0.18.
2, T91 steel welding process according to claim 1, it is characterized in that welding sloping angle is 27 °, wrong value is less than 1mm.
3, T91 steel welding process according to claim 1, selecting the tip diameter when it is characterized in that welding for use is φ 10mm, and tungsten bar is φ 2.5mm, and the welding gun argon flow amount is 9-10L/min.
4, T91 steel welding process according to claim 1 is characterized in that flux-cored wire backing welding layer thickness should be greater than 3mm.
5, T91 steel welding process according to claim 1 is characterized in that 150 ℃ of welding pre-heating temperatures, 150 ℃～200 ℃ of interlayer temperatures.
6, T91 steel welding process according to claim 1, it is characterized in that weld seam welding finishes after, be cooled to below 120 ℃, carry out post weld heat treatment again.
7, T91 steel welding process according to claim 1 is characterized in that post weld heat treatment technology comprises:
(1) heating-cooling speed≤250 of post weld heat treatment ℃/h;
(2) heating-up temperature is 760 ℃ ± 10 ℃, and constant temperature time is 2 hours;
When (3) being cooled to 200 ℃, be cooled to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021103577A CN1168569C (en) | 2002-04-25 | 2002-04-25 | T91 steel welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021103577A CN1168569C (en) | 2002-04-25 | 2002-04-25 | T91 steel welding process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1398694A CN1398694A (en) | 2003-02-26 |
| CN1168569C true CN1168569C (en) | 2004-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021103577A Expired - Fee Related CN1168569C (en) | 2002-04-25 | 2002-04-25 | T91 steel welding process |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389924C (en) * | 2005-06-02 | 2008-05-28 | 石家庄电力工业学校焊接培训中心 | P91 steel welding method |
| CN100464923C (en) * | 2006-06-09 | 2009-03-04 | 浙江省火电建设公司 | P92 steel welding process |
| CN100457373C (en) * | 2007-04-27 | 2009-02-04 | 北京工业大学 | High-alloy martensite type refractory steel air-protecting flux-cored wire |
| CN101450426B (en) * | 2008-12-31 | 2010-12-15 | 宁波隆兴焊割科技股份有限公司 | Low-temperature steel flux-cored wire |
| CN102189352B (en) * | 2010-10-15 | 2012-12-19 | 东方电气集团东方锅炉股份有限公司 | P92 steel submerged arc welding wire |
| PT2695695T (en) * | 2012-08-08 | 2018-04-09 | Arvos Gmbh | Method for welding conduits |
| CN103350272B (en) * | 2013-06-24 | 2016-02-10 | 兰州西固热电有限责任公司 | A kind of welding procedure of T91 and 12Cr1MoV dissimilar steel |
| CN104634679B (en) * | 2014-12-17 | 2017-12-08 | 国家电网公司 | A kind of method of measurement P91 steel weld seam Brinell hardness |
| CN104858555A (en) * | 2015-06-10 | 2015-08-26 | 江苏力沛电力工程技术服务有限公司 | Pressure pipeline welding process |
| CN106166637A (en) * | 2016-08-04 | 2016-11-30 | 江门建滔高科技有限公司 | A kind of multistage welding fabrication technique |
| CN106624285A (en) * | 2016-12-29 | 2017-05-10 | 甘肃钢铁职业技术学院 | 350 MW unit main steam pipeline-P91 welding process |
| CN108340052A (en) * | 2017-01-22 | 2018-07-31 | 江苏大秦电气有限公司 | The assembled welding process of P91 heat resisting steel |
| CN111098090A (en) * | 2018-10-29 | 2020-05-05 | 兴化市中科渗铝钢管有限公司 | Aluminizing pipeline welding method |
| CN114178739B (en) * | 2021-12-27 | 2022-12-27 | 宣达实业集团有限公司 | High-toughness high-silicon stainless steel argon-filling-free argon arc welding wire and preparation process thereof |
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2002
- 2002-04-25 CN CNB021103577A patent/CN1168569C/en not_active Expired - Fee Related
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