CN102248267A - Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology - Google Patents
Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology Download PDFInfo
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- CN102248267A CN102248267A CN2011102091478A CN201110209147A CN102248267A CN 102248267 A CN102248267 A CN 102248267A CN 2011102091478 A CN2011102091478 A CN 2011102091478A CN 201110209147 A CN201110209147 A CN 201110209147A CN 102248267 A CN102248267 A CN 102248267A
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Abstract
The invention discloses a thick-wall chromium-molybdenum steel pipeline submerged arc welding technology, which is characterized in that an automatic submerged arc welding is used for filling and welding a cover: a pipeline is placed on a rolling tire, an automatic submerged arc welder is used for welding the pipeline, the rolling tire is rotated to drive the pipeline to rotate during welding, and a welding gun is located at a flat welding position and always keeps still; welding parameters are as follows: the welding current is 240-500A, the voltage is 30-36.5V, the welding speed is 36-46.5 cm/min, the extension length of a welding wire is 8-12 mm, and a distance from a tail end of the welding wire to a weld surface is 5-6 mm. The average working efficiency by using the submerged arc welding technology to weld the thick-wall chromium-molybdenum steel pipeline is more than 4-6 times that of the manual welding, the thickness theta of a welding wall is more than the thick-wall pipeline of 30 mm, and the working efficiency is 8-12 times that of the manual welding.
Description
Technical field
The invention belongs to the pipeline welding technical field, particularly a kind of heavy wall (chrome-molybdenum steel pipeline welding technique of submerged arc welding of δ 〉=20mm).
Background technology
In engineering constructions such as the ethylene unit of petroleum chemical industry, oil refining apparatus, there is the welding of a large amount of heavy wall chrome-molybdenum steel pipelines.The traditional welding method of the welding of heavy wall chrome-molybdenum steel pipeline is the manual argon arc welding bottoming, and SMAW is filled capping; Adopt traditional welding method welding job amount bigger, the weld job time is long, and labour intensity is big, and production efficiency is low.Along with petrochemical industry from size to strength transformation gradually.Device maximization, integrated, more and more higher to professional construction level and engineering-built Capability Requirement, the pipeline welding engineering has become " bottleneck " that influences the engineering integral constructing duration, adopts conventional construction method far can not satisfy requirement of engineering merely.
Summary of the invention
The present invention for solve the technical problem that exists in the known technology provide a kind of heavy wall (the chrome-molybdenum steel pipeline welding technique of submerged arc welding of δ 〉=20mm), this welding procedure can greatly reduce labour intensity; Improve welding production efficiency, guarantee welding quality better.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: a kind of heavy wall chrome-molybdenum steel pipeline welding technique of submerged arc welding may further comprise the steps:
One) pipeline being done groove processes and the surfaces externally and internally of this groove and both sides is cleaned out;
Two) it is right to carry out pipeline group;
Three) adopt GTAW to group to after pipeline carry out the spot welding location;
Four) weld is carried out preheating;
Five) adopt manual argon arc welding to finish the bottoming welding, and carry out postheating and the back slow cooling that heats up;
Six) adopting Lincoln weld to finish fills and cover welding: pipeline is placed on the rolling tire, adopt automatic submerged-arc welding machine that it is welded, during welding, the rotation of rolling tire drives the pipeline rotation, welding gun is in the downhand position, and remains motionlessly, and welding condition is: welding current is: 240～500A, voltage: 30～36.5V, speed of welding: 36～46.5cm/min; Electrode extension is 8～12mm, and wire tip is 5～6mm apart from the distance of face of weld;
The step of filling and cover welding is as follows:
1) pretrigger automatic submerged-arc welding machine, prerun torch swinging amplitude satisfies the weld width requirement to determine it;
2) start automatic submerged-arc welding machine, pipeline is carried out multi-pass welding; In the welding process, according to molten bath inside weld shaping situation, fine setting welding current and speed of welding are to improve the appearance of weld situation.
In step 6) 2) in, a welding line should be avoided in the starting the arc position of described automatic submerged-arc welding machine.
When pipe material is P22, wall thickness is 55.56mm, fills and the welding current of cover welding is: 300～500A, voltage: 30～36.5V, speed of welding: 41.1～46.5cm/min.
When pipe material is P22, wall thickness is 28.58mm, fills and the welding current of cover welding is: 240～400A, voltage: 30～34V, speed of welding: 36～40cm/min.
When pipe material is P11, wall thickness is 26mm, fills and the welding current of cover welding is: 300～330A, voltage: 30～32V, speed of welding: 36～40cm/min.
Advantage and good effect that the present invention has are: adopt Lincoln weld filling, capping, appearance of weld is attractive in appearance, and quality of weld seam molding is good, weld seam and mother metal rounding off, surperficial flawless, pore, slag inclusion, splash, defective such as lack of penetration.The welding first-time qualification rate can reach 100%; Speed of welding is very fast, welding production efficiency height, and posted sides pipeline per pass weld bond has once welded, and no longer does intermediate survey, has both saved the time, the probability of also avoiding the preheating increase of repetition to go wrong.Adopt the present invention weld the average work efficiency of heavy wall chrome-molybdenum steel pipeline be 4 times of manual welding～more than 6 times, the posted sides pipeline of welding wall thickness δ＞30mm, work efficiency is 8 times～12 times of manual welding.
Description of drawings
Fig. 1 welds δ≤bevelled structural representation of 30mm pipeline by using the present invention;
Fig. 2 welds δ＞bevelled structural representation of 30mm pipeline by using the present invention.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
Embodiment 1:
φ 457.2 * 55.56mm chrome-molybdenum steel P22 pipeline welding technique of submerged arc welding:
1, groove processing
Adopt disposable cut-out and the groove processing of finishing pipe of pipe lathe.Adopt the machining groove, the groove crudy is good, the utilization rate height of machinery, cutting efficiency height.
Bevelled form is double V-shaped, sees also Fig. 2, the bevel angle α of following double V-groove=65 °, and the bevel angle β of last double V-groove=10 °, root face height P=1.5mm, following double V-groove end face is apart from the height h=19mm of mother metal bottom surface.Groove should carry out 100% dyeing inspection, is qualified with flawless.
2, cleaning group is right
Group is cleaned out iron rust, the oil of groove face and fringe region with angie type sanding machine, bar type abrasive machine or file etc. preceding, up to exposing metallic luster.
Group to the time want inwall concordant, group to unfitness of butt joint be no more than wall thickness 10% and be not more than 1mm.Group is 3mm to the gap.
3, location welding
Adopt manual argon arc welding to group to after pipeline carry out the spot welding location, tack welding should adopt and formally weld identical welding material, fusion length is 15mm, thickness is 4mm.
The tack-weld throat depth is no more than 2/3 of wall thickness.The tack-weld weld seam needs rounding off along the even distribution of circumference and two, counts and determines according to actual caliber and wall thickness; When adopting the welding of bridging type location, when the formal weld seam of welding, should the tack-weld weld grinding is clean.
4, weld preheating
The reply weld carries out preheating before the pipeline backing welding, can weld the pre-thermal recovery Electric heating of weld seam after reaching preheat temperature.Preheat temperature is controlled by the temperature control cabinet, and measures at weld seam position electricity consumption point temperature meter.The preheat temperature of present embodiment is 200 ℃～300 ℃, reaches that insulation began welding in 15 minutes after the preheat temperature.
5, backing welding
The manual argon arc welding bottoming, welding equipment adopts silicon rectifier electric welding machine ZX-400A or other direct-flow argon-arc welders.The welding wire of selecting for use is: ER90S-B3; Gage of wire is:
Protective gas: argon gas, purity is not less than 99.96%.Welding condition: welding current: 100～120A, voltage: 18～22V, speed of welding: 8～12cm/min.Bottoming thickness is 3～6mm.Carry out postheating immediately after bottoming welding finishes, reach 300～350 ℃ to weld seam temperature after, be incubated 30 minutes, slow cooling is to room temperature.
6, filling, cosmetic welding
Filling, cosmetic welding adopt Lincoln weld, and what welding material was selected for use is homemade submerged-arc welding wire and solder flux, and gage of wire is 2.4mm; The welding wire trade mark of selecting for use is CHW-S8, is equivalent to AWS A5.23 EB3, and solder flux is SJ603, and granularity is 10～60 orders.Welding equipment adopts cantilevered pipeline automatic welding special plane, and model is: AUTO CWM2010-A; Welding system is made of the source of welding current, welding control panel, welding tractor, wire-feed motor, welding gun; Welding accessory system: constitute by positioner (compression type rolling tire), bracing frame; The source of welding current adopts U.S. Miller DW-852 type, and maximum output current is 600A.During welding, welding gun is motionless, and weldment rotation allows welding remain at the downhand position and carries out, and pipeline section is placed on the rolling tire, and the rotation that the rotation by the rolling tire drives pipeline section realizes welding.By control panel and manual fine-tuning button, it is 8～12mm that the adjustment welding gun makes its nozzle alignment weld seam center and welding wire elongation, and wire tip is 5～6mm apart from face of weld.Should set welding condition by control panel according to welding procedure sheet at a forearc, concrete welding condition sees Table 1.
Table 1 φ 457.2 * 55.56mm chrome-molybdenum steel P22 pipeline welding technique of submerged arc welding parameter
Filling, cosmetic welding adopt multi-pass welding; Operating personnel will observe the situation in molten bath at any time in the welding process, particularly in unfitness of butt joint and gap bigger in, in time use trim button to adjust welding current and speed of welding, to improve the appearance of weld situation; Because the welding quality stable of automatic weldering, the per pass weld bond has once welded, and no longer does intermediate survey.
Press " startup " switch, prerun torch swinging amplitude satisfies the weld width requirement to determine it.Press " opening arc " button, begin welding, the starting the arc will be avoided the tack-weld weld seam as far as possible.In the welding process, along with the increase of weldering meat thickness, the distance of manual adjustments torch neck and weld seam, keeping wire tip is 5～6mm apart from face of weld.In welding process, finely tune by control panel according to the weld bead shape situation.
Embodiment 2:
φ 219 * 28.58mm chrome-molybdenum steel P22 pipeline welding technique of submerged arc welding, identical with the step of embodiment 1, difference is:
1) groove type of Cai Yonging is a V-type, and bevel angle is α=60 °, sees also Fig. 1.
2) group is 2mm to the gap.
3) anchor point weld seam length is 10mm, and thickness is 2mm.
4) welding condition is as shown in table 2.
Table 2 φ 219 * 28.58mm chrome-molybdenum steel P22 pipeline welding technique of submerged arc welding parameter
Embodiment 3:
φ 219 * 26mm chrome-molybdenum steel P11 pipeline welding technique of submerged arc welding, identical with the step of embodiment 1, difference is:
1) groove type of Cai Yonging is a V-type, and bevel angle is α=60 °, sees also Fig. 1, and group is 2mm to the gap.
2) tack weld length 10mm, thickness 3mm.
3) weld preheating temperature is 150 ℃～250 ℃.
4) the welding wire trade mark of fill, cosmetic welding being selected for use is CHW-S11, and solder flux is SJ105, and granularity is 10～60 orders.
5) welding condition is as shown in table 3.
Table 3 φ 219 * 26mm chrome-molybdenum steel P11 pipeline welding technique of submerged arc welding parameter
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (5)
1. a heavy wall chrome-molybdenum steel pipeline welding technique of submerged arc welding is characterized in that, may further comprise the steps:
One) pipeline being done groove processes and the surfaces externally and internally of this groove and both sides is cleaned out;
Two) it is right to carry out pipeline group;
Three) adopt GTAW to group to after pipeline carry out the spot welding location;
Four) weld is carried out preheating;
Five) adopt manual argon arc welding to finish the bottoming welding, and carry out postheating and the back slow cooling that heats up;
Six) adopting Lincoln weld to finish fills and cover welding: pipeline is placed on the rolling tire, adopt automatic submerged-arc welding machine that it is welded, during welding, the rotation of rolling tire drives the pipeline rotation, welding gun is in the downhand position, and remains motionlessly, and welding condition is: welding current is: 240～500A, voltage: 30～36.5V, speed of welding: 36～46.5cm/min; Electrode extension is 8～12mm, and wire tip is 5～6mm apart from the distance of face of weld;
The step of filling and cover welding is as follows:
1) pretrigger automatic submerged-arc welding machine, prerun torch swinging amplitude satisfies the weld width requirement to determine it;
2) start automatic submerged-arc welding machine, pipeline is carried out multi-pass welding; In the welding process, according to molten bath inside weld shaping situation, fine setting welding current and speed of welding are to improve the appearance of weld situation.
2. heavy wall chrome-molybdenum steel pipeline welding technique of submerged arc welding according to claim 1 is characterized in that, in step 6) 2) in, a welding line should be avoided in the starting the arc position of described automatic submerged-arc welding machine.
3. heavy wall chrome-molybdenum steel pipeline welding technique of submerged arc welding according to claim 1 is characterized in that, when pipe material is P22, wall thickness is 55.56mm, the welding current of filling and cover welding is: 300～500A, voltage: 30～36.5V, speed of welding: 41.1～46.5cm/min.
4. heavy wall chrome-molybdenum steel pipeline welding technique of submerged arc welding according to claim 1 is characterized in that, when pipe material is P22, wall thickness is 28.58mm, the welding current of filling and cover welding is: 240～400A, voltage: 30～34V, speed of welding: 36～40cm/min.
5. heavy wall chrome-molybdenum steel pipeline welding technique of submerged arc welding according to claim 1 is characterized in that, when pipe material is P11, wall thickness is 26mm, the welding current of filling and cover welding is: 300～330A, voltage: 30～32V, speed of welding: 36～40cm/min.
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Cited By (17)
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| CN102785017A (en) * | 2012-08-02 | 2012-11-21 | 中国石油化工集团公司 | Composite welding process used in narrow space |
| CN103495795A (en) * | 2013-10-10 | 2014-01-08 | 中国化学工程第三建设有限公司 | Gas protection bottoming automatic welding process of carbon steel pipeline consumable electrode |
| CN104117780A (en) * | 2013-04-27 | 2014-10-29 | 中国石油天然气股份有限公司 | Repairing process of chromium-molybdenum steel tube bundle and tube plate |
| CN104308336A (en) * | 2014-09-15 | 2015-01-28 | 安徽鸿路钢结构(集团)股份有限公司 | Steel welding process |
| CN104801835A (en) * | 2015-02-26 | 2015-07-29 | 胜利油田龙玺石油工程服务有限责任公司 | Method for welding without back chipping for ice resisting and water resisting pipe joint |
| CN105499769A (en) * | 2016-02-04 | 2016-04-20 | 四川石油天然气建设工程有限责任公司 | Submerged arc automatic welding process suitable for sulfur-resisting process pipeline welding |
| CN106425045A (en) * | 2016-10-28 | 2017-02-22 | 共享铸钢有限公司 | Welding method of big-wall-thickness and small-pipe-diameter pipe fittings |
| CN107552987A (en) * | 2017-09-15 | 2018-01-09 | 神华集团有限责任公司 | Pipeline welding process |
| CN107671398A (en) * | 2017-11-13 | 2018-02-09 | 南京奥特电气股份有限公司 | A kind of narrow groove SAW automatic soldering techniques method of thick-walled pipe and welding head |
| CN108927589A (en) * | 2018-07-16 | 2018-12-04 | 中车青岛四方机车车辆股份有限公司 | A kind of plug-in type tube sheet overlaying method |
| CN109048003A (en) * | 2018-08-25 | 2018-12-21 | 鲁西工业装备有限公司 | A kind of minor diameter thickness wall carbon steel pipe road welding method |
| CN110238492A (en) * | 2019-05-28 | 2019-09-17 | 中石化第十建设有限公司 | A kind of vertical fixing port all positon submerged-arc welding process of pipeline |
| CN111112964A (en) * | 2020-01-08 | 2020-05-08 | 长治市三耐铸业有限公司 | Arc powder concentrator blade surfacing method |
| CN111482680A (en) * | 2020-04-21 | 2020-08-04 | 西安热工研究院有限公司 | Narrow-gap welding groove and welding method for thick-wall pipeline |
| CN113560698A (en) * | 2021-08-09 | 2021-10-29 | 苏州天顺新能源科技有限公司 | Double-head cantilever crane car welding process |
| CN113732550A (en) * | 2020-05-27 | 2021-12-03 | 宝山钢铁股份有限公司 | Low-carbon microalloyed steel weldability assessment method based on filament gas shielded welding |
| CN113732554A (en) * | 2020-05-27 | 2021-12-03 | 宝山钢铁股份有限公司 | Low-carbon microalloyed steel weldability evaluation method based on gas shielded flux-cored wire |
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| CN102785017B (en) * | 2012-08-02 | 2015-07-08 | 中国石油化工集团公司 | Composite welding process used in narrow space |
| CN102785017A (en) * | 2012-08-02 | 2012-11-21 | 中国石油化工集团公司 | Composite welding process used in narrow space |
| CN104117780A (en) * | 2013-04-27 | 2014-10-29 | 中国石油天然气股份有限公司 | Repairing process of chromium-molybdenum steel tube bundle and tube plate |
| CN104117780B (en) * | 2013-04-27 | 2016-10-19 | 中国石油天然气股份有限公司 | A kind of chrome-molybdenum steel tube bank and tube sheet maintenance process |
| CN103495795A (en) * | 2013-10-10 | 2014-01-08 | 中国化学工程第三建设有限公司 | Gas protection bottoming automatic welding process of carbon steel pipeline consumable electrode |
| CN104308336A (en) * | 2014-09-15 | 2015-01-28 | 安徽鸿路钢结构(集团)股份有限公司 | Steel welding process |
| CN104308336B (en) * | 2014-09-15 | 2017-07-28 | 安徽鸿路钢结构(集团)股份有限公司 | A kind of welded steel technique |
| CN104801835A (en) * | 2015-02-26 | 2015-07-29 | 胜利油田龙玺石油工程服务有限责任公司 | Method for welding without back chipping for ice resisting and water resisting pipe joint |
| CN105499769B (en) * | 2016-02-04 | 2018-01-30 | 四川石油天然气建设工程有限责任公司 | A kind of welding technology of automatic submerged-arc welding suitable for the welding of sulfur resistive process pipe |
| CN105499769A (en) * | 2016-02-04 | 2016-04-20 | 四川石油天然气建设工程有限责任公司 | Submerged arc automatic welding process suitable for sulfur-resisting process pipeline welding |
| CN106425045A (en) * | 2016-10-28 | 2017-02-22 | 共享铸钢有限公司 | Welding method of big-wall-thickness and small-pipe-diameter pipe fittings |
| CN107552987A (en) * | 2017-09-15 | 2018-01-09 | 神华集团有限责任公司 | Pipeline welding process |
| CN107671398A (en) * | 2017-11-13 | 2018-02-09 | 南京奥特电气股份有限公司 | A kind of narrow groove SAW automatic soldering techniques method of thick-walled pipe and welding head |
| CN108927589A (en) * | 2018-07-16 | 2018-12-04 | 中车青岛四方机车车辆股份有限公司 | A kind of plug-in type tube sheet overlaying method |
| CN109048003A (en) * | 2018-08-25 | 2018-12-21 | 鲁西工业装备有限公司 | A kind of minor diameter thickness wall carbon steel pipe road welding method |
| CN110238492A (en) * | 2019-05-28 | 2019-09-17 | 中石化第十建设有限公司 | A kind of vertical fixing port all positon submerged-arc welding process of pipeline |
| CN111112964A (en) * | 2020-01-08 | 2020-05-08 | 长治市三耐铸业有限公司 | Arc powder concentrator blade surfacing method |
| CN111482680A (en) * | 2020-04-21 | 2020-08-04 | 西安热工研究院有限公司 | Narrow-gap welding groove and welding method for thick-wall pipeline |
| CN113732550A (en) * | 2020-05-27 | 2021-12-03 | 宝山钢铁股份有限公司 | Low-carbon microalloyed steel weldability assessment method based on filament gas shielded welding |
| CN113732554A (en) * | 2020-05-27 | 2021-12-03 | 宝山钢铁股份有限公司 | Low-carbon microalloyed steel weldability evaluation method based on gas shielded flux-cored wire |
| CN113732554B (en) * | 2020-05-27 | 2022-09-16 | 宝山钢铁股份有限公司 | Low-carbon microalloyed steel weldability evaluation method based on gas shielded flux-cored wire |
| CN113732550B (en) * | 2020-05-27 | 2022-09-16 | 宝山钢铁股份有限公司 | Low-carbon microalloyed steel weldability assessment method based on filament gas shielded welding |
| CN113560698A (en) * | 2021-08-09 | 2021-10-29 | 苏州天顺新能源科技有限公司 | Double-head cantilever crane car welding process |
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