CN101791746A - Large high-temperature refractory steel pipeline welding process - Google Patents
Large high-temperature refractory steel pipeline welding process Download PDFInfo
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- CN101791746A CN101791746A CN 201010134667 CN201010134667A CN101791746A CN 101791746 A CN101791746 A CN 101791746A CN 201010134667 CN201010134667 CN 201010134667 CN 201010134667 A CN201010134667 A CN 201010134667A CN 101791746 A CN101791746 A CN 101791746A
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Abstract
The invention discloses a large high-temperature refractory steel pipeline welding process which comprises a pre-weld interface decontamination procedure, a descaling procedure and a groove sanding procedure. The process is characterized by also comprising the following steps: (1) processing, inspecting and pre-heating a welded groove, wherein the preheating temperature is controlled to be 200-250 DEG C; (2) welding the bottom layer of the welded groove by manual electric arc welding; and (3) removing welding slag at the bottom layer, and then welding the cap by shielded arc welding, wherein the steps (1,2 and 3) are all carried out in the natural environment weather of no rainfall, air humidity less than 80% and wind power lower than Level 6. By using the welding technology which combines the manual electric arc welding and the full-argon gas shielded arc welding, the invention has the advantages of manageable technological operation, beautiful formed weld and high primary qualification rate, lowers the repair rate of the weld, and greatly decreases the labor cost and the equipment investment, thereby achieving favorable economic and social benefits.
Description
Technical field
The present invention relates to technical field of building construction, specifically be meant a kind of large high-temperature refractory steel pipeline welding process.
Background technology
In the existing engineering; usually adopt the 15CrMo steel plate to adopt the manual welding mode to make pipeline and be used for the outdoor pipe system; but this kind material steel plate only limits to tubule footpath steel pipe; when it is applied to environmental protection dust pelletizing system etc. and needs big caliber engineering; problems such as weld cracking appear in steel pipe through regular meeting; influence its service behaviour greatly, improved the working service cost.Cause the main cause of this phenomenon to be that the 15CrMo steel has following technical characterictic:
1, hardenability
Under the peculiar cooling velocity of Thermal Cycle, weld seam and heat affecting might form the tissue to the cold crack sensitivity.When cooling velocity during greater than 300 ℃/s, the tissue of welding and heat affected area all is a martensite, and its hardness might cause the formation of cold crack up to 400HV.
2, reheat crack(ing)
15CrMo heat resisting steel contains carbide formers such as Cr, Mo, V, Nb and Ti, and there is reheat crack(ing) tendency to a certain degree the overheated zone.
3, temper brittleness
As harmful residual elements such as P, Sb, Sn, As content is higher and joint during for a long time 370 ℃ of-565 ℃ of temperature ranges operations, can cause temper brittleness.
4, chemical composition and mechanical property table
Table 1 15CrMo chemical composition (%)
| C | ??Mn | ??Si | ??Cr | ??Mo | ??S | ??P |
| 0.12-0.18 | ??0.4-0.??7 | ??0.17-0.37 | ??0.8-1.1 | ??0.4-0.5??5 | ??≤0.03 | ??≤0.035 |
Table 2 15CrMo mechanical property
| 15CrMo | Yield strength (Mpa) | Tensile strength (Mpa) | Elongation after fracture (%) | Clod wash experiment (d=3a) |
| The material certificate | ≥294 | ≥440 | ≥18 | Qualified |
| Recheck report | 335 | 470 | 32 | Qualified |
By table 1 component content, according to International Institute of Welding (IIW) carbon equivalent formula
CE(IIW)＝C+Mn/6+(Ni+Cu)/15+(Cr+Mo+V)/5
Calculate CE=0.47.
Japan is according to rattan (ITO) formula
Pcm＝C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B
Calculate Pcm=0.26.
API5L the 42nd edition has stipulated CE≤0.43%, Pcm≤0.25% o'clock, and the steel tendency of hardenability is little, and weldability is good, does not need preheating.This shows that 15CrMo heat resisting steel carbon equivalent is higher, cause forming in the welding process hardened structure, the plasticity of weld seam, toughness reduce, and weldability is relatively poor, so need certain technological measure.
Summary of the invention
At above-mentioned technical problem, the invention provides a kind of large high-temperature refractory steel pipeline welding process of producing with good anti-cracking performance.
The technical scheme that the present invention takes is: a kind of large high-temperature refractory steel pipeline welding process, and it comprises the decontamination of welding front port, rust cleaning and polishing groove flow process, it is characterized in that this technology also includes following flow process:
1., to bevel for welding process, flaw detection, The pre-heat treatment, preheat temperature is controlled at 200～250 ℃;
2., adopt manual electric arc welding that the bevel for welding bottom is welded;
3., remove the bottom welding slag after, adopt gas shielded arc welding that capping is welded;
Described flow process 1,2,3 is all at no precipitation, and air humidity is less than 80%, and wind-force carries out less than 6 grades natural environment weather.
As further specifying of such scheme, described groove is a V-butt, and the gradient of this V-butt is 40～50 °, and the bottom width of this V-butt equals end height.
The technical scheme that realizes the object of the invention comprises further that also the welding rod that described manual electric arc welding is adopted is R307.
The technical scheme that realizes the object of the invention comprises further that also described welding rod needs the drying insulation to handle, and bake out temperature is 300～400 ℃, dries 50～60 minutes and is incubated with electrode dryer.
The technical scheme that realizes the object of the invention comprises further that also the protective gas that described gas shielded arc welding adopted is Ar and CO2 gaseous mixture, and Ar and CO2 volume ratio are 80% to 20%.
The technical scheme that realizes the object of the invention comprises further that also the welding wire that described gas shielded arc welding adopted is H08CrMnSiMo.
The beneficial effect that the present invention adopts above technical scheme to reach is:
1. the present invention adopts the solder technology of manual electric arc welding welding and rich argon welding welding combination, and technological operation is easy to grasp, and appearance of weld is attractive in appearance, weldment X ray film making reaches more than the II level, and the first-time qualification rate height has reduced the repair rate of weld seam, and wind loading rating is strong, is specially adapted to field work.
2. equipment of the present invention is conventional DC welding machine and CO
2Welding machine can use it for anything else after the engineering completion, has avoided the idle waste of equipment; Weld preheating temperature and interlayer temperature are lower, have reduced the consumption of oxygen-acetylene, greatly reduce the input of labour cost and equipment, have obtained good economy and social benefit.
The specific embodiment
For further setting forth the present invention, the present invention is elaborated below in conjunction with preferred embodiment.
In the present embodiment, natural environmental condition is: 30 ℃ of environment temperatures, and humidity 50%, weldment is in strict accordance with the groove system, and groove is a V-arrangement, and the groove gradient is 45 degree, root face 2mm, gap 2mm, the bottom width of groove equals end height.After groove machines, whether need has face crack with magnetic powder inspection to check, and clean out and cut interior rust and the dirt of the inside and outside both sides of slag, oxide skin and groove 50mm scope, be preheating to 200 ℃ with oxy-acetylene flame in the 50mm of groove both sides, interlayer temperature is controlled at more than 200～250 ℃, the welding rod bake out temperature is 300～400 ℃, and preferred 350 ℃, drying time is 60 minutes and is incubated with electrode dryer.During welding, adopt welding at many levels, manual electric arc welding is adopted in the bottom weldering, and welding rod adopts R307, and cosmetic welding adopts rich argon welding, and welding wire adopts H08CrMnSiMo, adopts Ar and CO2 mist as protective gas simultaneously, and Ar and CO2 volume ratio are 80% to 20%.Should avoid in the welding process interrupting, the disposable sequential welding of trying one's best is intact, and postwelding is answered slow cooling, and mother metal and welding rod, welding wire have the witness censorship before the weldering, carries out next process after qualified.
In the manual electric arc welding welding process, note following some:
1, backing welding pays special attention to control the size and the shape in molten bath, and molten bath too big explanation weldering speed is slow, easily burns the formation overlap, too the bright weldering speed of novel is fast in the molten bath, and the root face lack of fusion easily causes defectives such as lack of penetration, and the molten bath size should be controlled at 5～6mm, be shaped as ellipse, at the uniform velocity move ahead during arc manipulation.
2, speed of welding is slow slightly during capping, makes the teeter arc manipulation, and welding rod is transported to the groove limit fast and has a break, and makes weld seam level and smooth.
3, weld each layer (road) face of weld and should try one's best smoothly, be easy to take off slag, reduce the polishing amount of convex weld, better control the break time of lower floor's welding, reduced the generation of weld defect.
4, each layer (road) weld seam should be polished into the gentle slope shape with receiving the arc place before joint, at the front end of the joint area electric arc that ignites, pulls back and normally welds to the joint, can avoid the generation of welding point pore and slag inclusion like this.
Will pay special attention to the control of arc voltage and speed of welding during the richness argon welding, key is to keep arc length not change substantially in welding process.Stem elongation degree 8～12mm, gas uses argon gas and carbon dioxide gas mixture, splashes in order to reduce, and keeps the stable of electric arc, and leftward welding is adopted in welding, and the source of welding current adopts dc reverse connection.
Claims (6)
1. large high-temperature refractory steel pipeline welding process, it comprises the decontamination of welding front port, rust cleaning and polishing groove flow process, it is characterized in that this technology also includes following flow process:
1., to bevel for welding process, flaw detection, The pre-heat treatment, preheat temperature is controlled at 200～250 ℃;
2., adopt manual electric arc welding that the bevel for welding bottom is welded;
3., remove the bottom welding slag after, adopt gas shielded arc welding that capping is welded;
Described flow process 1,2,3 is all at no precipitation, and air humidity is less than 80%, and wind-force carries out less than 6 grades natural environment weather.
2. large high-temperature refractory steel pipeline welding process according to claim 1 is characterized in that, described groove is a V-butt, and the gradient of this V-butt is 40～50 °, and the bottom width of this V-butt equals end height.
3. large high-temperature refractory steel pipeline welding process according to claim 1 is characterized in that, the welding rod that described manual electric arc welding is adopted is R307.
4. large high-temperature refractory steel pipeline welding process according to claim 3 is characterized in that, welding bar for hand electric arc-welding needs the drying insulation to handle, and bake out temperature is 300～400 ℃, dries 50～60 minutes and is incubated with electrode dryer.
5. large high-temperature refractory steel pipeline welding process according to claim 1 is characterized in that, the protective gas that described gas shielded arc welding adopted is Ar and CO2 gaseous mixture, and Ar and CO2 volume ratio are 80% to 20%.
6. large high-temperature refractory steel pipeline welding process according to claim 1 or 5 is characterized in that the welding wire that described gas shielded arc welding adopted is H08CrMnSiMo.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756218A (en) * | 2011-04-27 | 2012-10-31 | 五冶集团上海有限公司 | Benzene hydrogenation engineering heat resistant steel pipeline welding method |
| CN104551337A (en) * | 2015-01-23 | 2015-04-29 | 中誉远发国际建设集团有限公司 | 30CrMo heat resistant steel pipeline welding construction method |
| CN106735760A (en) * | 2017-01-18 | 2017-05-31 | 安徽马钢工程技术集团有限公司 | A kind of welding procedure of 15CrMo heat-resisting alloy steels |
| CN108637428A (en) * | 2018-05-18 | 2018-10-12 | 共享铸钢有限公司 | A kind of high intensity gear ring class cast steel part defect weldering repair renovation method |
| CN109352198A (en) * | 2018-11-23 | 2019-02-19 | 芜湖新兴铸管有限责任公司 | A kind of welding method of pipe die |
| CN112077525A (en) * | 2020-08-07 | 2020-12-15 | 中国电建集团山东电力建设第一工程有限公司 | Thick-wall weld seam interlayer crack defect treatment process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464217A (en) * | 2002-06-12 | 2003-12-31 | 高文兴 | Process for manufacturing steel sheet made butt-welded single seam pulling bend |
-
2010
- 2010-03-29 CN CN 201010134667 patent/CN101791746A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464217A (en) * | 2002-06-12 | 2003-12-31 | 高文兴 | Process for manufacturing steel sheet made butt-welded single seam pulling bend |
Non-Patent Citations (4)
| Title |
|---|
| 《压力容器焊接结构工程分析》 19981231 王宽福 焊接结构制造的焊接工艺 化学工业出版社 第205页 , 1 * |
| 《石油规划设计》 19981231 宋祥林 15CrMo钢管的焊接 第22-23页 , 第2期 2 * |
| 《管道安装手册》 20060630 张金和 钢管坡口 机械工业出版社 第456页 , 1 * |
| 《金属加工》 20081231 杨天冰 长输油气管道焊接技术 第32-36页 , 第24期 2 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102756218A (en) * | 2011-04-27 | 2012-10-31 | 五冶集团上海有限公司 | Benzene hydrogenation engineering heat resistant steel pipeline welding method |
| CN104551337A (en) * | 2015-01-23 | 2015-04-29 | 中誉远发国际建设集团有限公司 | 30CrMo heat resistant steel pipeline welding construction method |
| CN106735760A (en) * | 2017-01-18 | 2017-05-31 | 安徽马钢工程技术集团有限公司 | A kind of welding procedure of 15CrMo heat-resisting alloy steels |
| CN108637428A (en) * | 2018-05-18 | 2018-10-12 | 共享铸钢有限公司 | A kind of high intensity gear ring class cast steel part defect weldering repair renovation method |
| CN108637428B (en) * | 2018-05-18 | 2020-10-27 | 共享铸钢有限公司 | Repair welding repair repairing method for defects of high-strength gear ring type steel castings |
| CN109352198A (en) * | 2018-11-23 | 2019-02-19 | 芜湖新兴铸管有限责任公司 | A kind of welding method of pipe die |
| CN112077525A (en) * | 2020-08-07 | 2020-12-15 | 中国电建集团山东电力建设第一工程有限公司 | Thick-wall weld seam interlayer crack defect treatment process |
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Open date: 20100804 |