CN104400200A - Flash butt welding process for high-pressure boiler pipeline - Google Patents
Flash butt welding process for high-pressure boiler pipeline Download PDFInfo
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- CN104400200A CN104400200A CN201410694523.0A CN201410694523A CN104400200A CN 104400200 A CN104400200 A CN 104400200A CN 201410694523 A CN201410694523 A CN 201410694523A CN 104400200 A CN104400200 A CN 104400200A
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- pipeline
- flash
- welding
- upset
- welded
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/04—Flash butt welding
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/34—Preliminary treatment
Abstract
The invention provides a flash butt welding process for a high-pressure boiler pipeline. The flash butt welding process comprises the steps of 1) selecting a pipeline material, namely #20 carbon steel, having the diameter of 219mm and the wall thickness of 14-16mm, 2) pretreatment before pipeline welding, 3) pipeline clamping, 4) setting welding parameters, namely extension length of 75-85mm, flash allowance of 21-24mm, upset allowance of 4-7.5mm, flash starting speed of 0.16-0.30mm/s, flash stopping speed of 1.15-1.55mm/s, flash current of 4.8-7.2kA, upset speed of 30-35mm/s, upset force of 9.5-11MPa, charged upset time of 0.1-0.5s and clamping force of 11-12MPa, 5) weld joint burr removal. The flash butt welding process for the high-pressure boiler pipeline is short in welding time and high in welding efficiency; the joint quality is satisfied; the erection welding of the boiler pipeline is developed into more efficient flash butt welding technique from argon arc welding plus gas shield welding; in short, the flash butt welding process has wide application prospect.
Description
Technical field
The present invention relates to a kind of welding technique, particularly relate to a kind of flash butt welding process of high-pressure boiler pipeline.
Background technology
In high-pressure boiler pipeline docking construction, the main welding method adopted is " argon arc welding+gas protects weldering " at present.During the large wall thickness pipeline of the method welding high-pressure boiler major diameter, require that the all-round counterpart of pipe is even; Slope type need adopt compound or U-shaped groove, and add welding procedure program, production efficiency is low, and production cost is high.But advanced flash butt welding technology requires very low to tube groove, and does not need wlding to get final product a welding fabrication, and weld interval is short, and production efficiency is high, greatly reduces production cost.
Especially the former Soviet Union abroad, flash butt welding technology is widely used in oil gas transport pipeline welding, to weld pipe diameter be Φ 1420m, wall thickness is 20mm, and weld interval only needs about 5min.Domestic in the nineties in 20th century, the continuous Flash Butt Welding of Primary Study low-pressure boiler steel pipe, for pipeline specifications be Φ 32mm x 3mm(12CrMoV steel) and Φ 51mm x 3mm(10 carbon steel), weld interval only needs a few second.This shows that the welding efficiency of flash of light docking technique is far away higher than semi-automatic gas shielded arc welding method, and production efficiency is very high, significant to pipe-line construction.But, Flash Butt Welding technological parameter comprises extension elongation, flash loss, upset allowance, flashing current, flashing speed, upset speed, upsetting force, clamping pressure, secondary idle load voltage etc., parameter is complicated and changeable, often change a material or dock sectional area and change, its welding condition all needs to reselect and optimize.Above-mentioned disclosed pipeline Flash Butt Welding technique or for the large wall thickness pipeline of the long defeated major diameter of oil gas, for low-pressure boiler minor diameter thin wall pipeline, the diameter that can not be used for the employing of Large Copacity high-pressure boiler is Φ 219mm, wall thickness is No. 20 carbon steel pipelines flash butt welding of 14 ~ 16mm, its technique needs again to develop, but has not yet to see relevant report.Along with boiler capacity is increasing, increasing pressure is high, and it is also increasing to the demand of the large wall thickness pipeline of major diameter, and therefore, developing corresponding flash-butt welding process will have wide practical use.
Summary of the invention
The object of the invention is to for above-mentioned existing problems and deficiency, there is provided a kind of and be applicable to that welding high-pressure boiler diameter is 219mm, thickness is the pipeline of 14 ~ 16mm, effectively can reduce production cost, meet the flash butt welding process of high-pressure boiler pipeline of boiler Large Copacity, the fast-developing demand of high-quality.
Technical scheme of the present invention is achieved in that
The flash butt welding process of high-pressure boiler pipeline of the present invention, the material in institute's welded tube road is No. 20 carbon steel, and diameter is 219mm, and wall thickness is 14 ~ 16mm, is characterized in that this welding procedure comprises the steps: A) pre-welding treatment is carried out to two pipelines to be welded; B) pipeline clamping; C) welding condition setting; D) glisten; E) upset; F) pressurize; G) weld seam burr removing; Wherein, welding condition is set as: each pipeline extension elongation L to be welded
1be 75 ~ 85mm, flash loss is 21 ~ 24mm, and upset allowance is 4 ~ 7.5mm, and flash of light initial velocity is 0.16 ~ 0.30mm/s, flash of light termination speed is 1.15 ~ 1.55mm/s, flashing current is 4.8kA ~ 7.2kA, and upset speed is 30 ~ 35mm/s, and upset force is 9.5 ~ 11MPa, charged upset time is 0.1 ~ 0.5s, clamping force is 11 ~ 12MPa, and secondary voltage is 6 ~ 7V, and weld interval is 185 ~ 230s.
Wherein, the technique of above-mentioned each pipeline pre-welding treatment to be welded comprises: be 10 to the end face bevel angle a to be welded of each pipeline to be welded
o± 2
o; The periphery of each pipeline to be welded is polished, polishing length L
2for more than the 300mm that outwards polishes from the outer rim of groove along pipeline axial.
The technique of above-mentioned pipeline clamping comprises: the end face parallel clearance b to be welded of two pipelines to be welded
1be 1 ~ 2mm; The inwall misplacement space b of two pipelines to be welded
2< 1mm.
Above-mentioned weld seam burr removing adopts push broach machinery to remove the outside burr of weld seam after welding immediately, and adopt plasma scarfing cinder technology to remove the inner burr of weld seam, and inside and outside ensureing weld seam, reinforcement is no more than 1.5mm.
The present invention compared with prior art, has following significant effect:
The invention provides the Flash Butt Welding process of the high-pressure boiler pipeline that a kind of rapid welding diameter is 219mm, thickness is 14 ~ 16mm, weld interval only has 185 ~ 230s, compared with conventional " argon arc welding+gas is protected and welded " method, substantially reduce weld interval, improve welding efficiency, reduce production cost, facilitate the update of boiler product.The invention allows for pre-welding treatment and clamping workpiece code requirement, make liquid lintel explosion between the flash stage end face after energising even, scaling loss amount uniformity on cross section, reaches the heating temperatures band that workpiece both ends of the surface are applicable to, for upset creates good condition.The present invention adopts Orthogonal regress design method, the welding conditions that the best flash loss of design and upset allowance and flashing current, flashing speed match with upset speed, easily there are the quality problems of welding greyness when solving welding in welding process, improve intensity and the toughness of joint.The present invention is also according to the structure of electrode and clamping device, the pass determining upset force and clamping force is 1:1.1, solve and cause clamping loosely because of electrode, clamping device wearing and tearing or workpiece size deviation, the difficult point of skidding during upset, and pipeline yielding difficult problem when controlling clamping, improve the bonding strength of joint.The present invention also proposes postwelding and carries out the requirement of weld seam burr removing immediately, the particularly inner burr removing of weld seam, for Non-Destructive Testing provides good condition, solve flash welding boiler tubing joint burr difficulty and remove, its technical barrier used of long-standing problem such as cause pipeline easily to block, not corrosion-resistant.
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Accompanying drawing explanation
Fig. 1 is the structural representation of inventive pipeline end face groove angle to be welded.
Fig. 2 is the structural representation of the present invention's pipeline polishing to be welded length.
Fig. 3 is the structural representation of two pipelines end face parallel clearance to be welded after clamping of the present invention.
Fig. 4 is the structural representation of two inner-walls of duct misplacement spaces after clamping of the present invention.
Fig. 5 is inventive pipeline Flash Butt Welding structural representation.
Detailed description of the invention
As Figure 1-Figure 5, the flash butt welding process of high-pressure boiler pipeline of the present invention, primarily of step compositions such as pipeline pre-welding treatment to be welded, pipeline clamping, welding condition setting, flash of light, upset, pressurize, weld seam burr removings.
A) pipeline pre-welding treatment to be welded: treat welded tube road bevel, angle a is 10
o± 2
o(as shown in Figure 1), to reduce the contact area just started when welding, the crude degree of the mouth of pipe is increased.In order to obtain high strength and stay-in-grade joint, pre-welding treatment must be carried out to pipeline, by length of tube L to be welded
2(as shown in Figure 2) periphery polishing, to occurring metallic luster, to ensure pipeline and the electrode contact area when clamping, meets pipeline and interelectrode electric conductivity.Polishing length L
2according to size and the pipeline extension elongation L to be welded of flash welding device electrode
1determine (as shown in Figure 5), and polishing mode is outwards polish along pipeline axial, more than 300mm from the outer rim of groove.When Flash Butt Welding just starts, the mouth of pipe is more crude is more conducive to flash of light.Because end face is uneven, only a few point cantact when two mouths of pipe contact, contact area is little, and current density is large, makes the metal around contact surface be heated to boiling temperature immediately and makes it explosion flash.This part heat prolongs tube wall immediately and transmits backward, the continuous feeding of pipe, produces again new explosion flash region, finally produces continous-stable flash of light.
B) pipeline clamping: need guarantee two pipeline end face to be welded to have certain parallel clearance, this parallel clearance b in clamping process
1be 1 ~ 2mm(as shown in Figure 3).Excesssive gap, pipeline end face cannot contact, and electric current cannot pass through, and causes welding to carry out.Gap is too small, and lintel sectional area increases and no longer explosion, cannot glisten.Suitable gap makes lintel explosion between pipe ends face even, and the scaling loss amount uniformity on cross section, the Temperature Distribution band on pipe ends face is suitable for.Pipeline is two inner-walls of duct misplacement space b after clamping
21mm(must be less than as shown in Figure 4), ensure the symmetry of the axiality of joint, mechanical performance and postwelding welding slag.
C) welding condition setting: before weld job, the setting of welding condition must be carried out, series of parameters is done best of breed, to ensure the mechanical strength properties that joint reaches required.When processing parameter setting, extension elongation should be selected according to pipeline difformity and sectional area, then equitable subsection is carried out to extension elongation and become flash loss and upset allowance, simultaneously when selecting extension elongation, strictly should consider original position when dynamic fixture advances, with the flash of light initial velocity obtained needed for and glisten termination speed and upset speed, and by controlling cylinder pressure when promoting dynamic fixture advance, obtain the upset force needed for.The clamping force of pipeline is realized by the pressure of hydraulic control system.
Pipeline extension elongation L to be welded
1it is the important parameter controlling flash loss, upset allowance, pipe ends surface temperature reasonable layout and joint plastic deformation, and flashing speed is one and ensures the strong and stable important parameter of flash of light, later stage speed of particularly glistening is too small can produce flash of light interruption, joint easily produces oxide-film slag inclusion, and excessive velocities, crossing of pipe ends face can be made tropical narrow, and increase the difficulty of plastic deformation, strength of joint declines.When upset starts, dynamic fixture advances at utmost speed suddenly and makes port gap shrinks, and cross beam section and increase and no longer explosion, flash of light stops, and at the end of upset, obtains suitable plastic deformation in pipeline end face region, promotes weld seam recrystallization process.When current-on upset, need the strict control time, in order to avoid joint produces burning defect.Flashing current depends on the area of section of pipeline and the current density required for flash of light.The electric current of flash stage is not a constant, there is certain fluctuation.According to welded high-pressure boiler pipeline diameter be 219mm, thickness is sectional area and the physical characteristics of materials thereof of 14 ~ 16mm, utilize orthogonal regression method optimization, determine following technique:
Extension elongation L
175 ~ 85mm;
Flash loss 21 ~ 24mm;
Upset allowance 4 ~ 7.5mm;
Flash of light initial velocity 0.16 ~ 0.30mm/s;
Flash of light termination speed 1.15 ~ 1.55mm/s;
Flashing current 4.8kA ~ 7.2kA;
Upset speed 30 ~ 35mm/s;
Upset force 9.5 ~ 11MPa;
Charged upset time 0.1 ~ 0.5s;
Clamping force 11 ~ 12MPa;
Secondary voltage 6 ~ 7V;
Weld interval 185 ~ 230s.
D) glisten: as shown in Figure 5, weldingvoltage is applied between the electrode 2 of flash butt welder 1, fine contact point on the end face to be welded of described pipeline to be welded 1 and the end face to be welded of pipeline to be welded 24 passes through form contact resistance and generate heat owing to there being electric current, the metal of these contact points, by rapid melting, forms the liquid lintel connecting two ends metal.The explosion under electric heating-Li acting in conjunction of these liquid lintels, outwards sprays at a high speed and forms flash of light.
E) upset: after flash of light terminates, on the right side of welding head, mobile terminal drives the clamp system 5 on right side to advance fast, together with pipeline 1 to be welded being impinged upon with pipeline 24 to be welded under the effect of upset force, motlten metal between pipe ends face and metal oxide are extruded, and two contact end materials produce plastic deformation.The faster the better for upset speed now in case the burning of not-go-end face.Upset force then produces certain be plastic deformation to standard to guarantee to extrude liquid metal in interface and joint.Upset force is too small, be then out of shape deficiency, and strength of joint declines; Upset force is excessive, then deflection is excessive, and crystallized is bending serious, reduces joint impact flexibility.Therefore, the upset speed of described pipeline is greater than 30mm/s, and upset force selects 9.5 ~ 11MPa.
F) pressurize: keep certain hour under weld seam pressure at two ends, makes material through metallurgical binding, forms weld seam.
G) weld seam burr removing: weld seam burr affects the use of welded pipe line, particularly pipe interior burr easily causes degradation problem under line clogging, joint corrosion resistance, therefore after flash welding pressurize terminates, taking advantage of before weld seam does not cool completely adopts outside push broach machinery to remove weld seam appearance burr immediately, and adopt plasma scarfing cinder technology to remove the burr of weld seam inside, inside and outside ensureing weld seam, reinforcement is no more than 1.5mm.
As shown in the table, three embodiments provided by the invention all adopt same technological process, that is: pipeline pre-welding treatment to be welded, pipeline clamping, welding condition setting, flash of light, upset, pressurize, weld seam burr removing.
Technological specification is: the end surface of pipeline to be welded is polished metallic luster, length L before weldering
2for 300mm; End face bevel, angle a is 10
o± 2
o.Two pipelines end face parallel clearance to be welded b after clamping
1be 1 ~ 2mm; Two inner-walls of duct misplacement space b
2< 1mm.Secondary voltage is 6.6V.Other different technology conditions is as shown in the table respectively:
| Technological parameter | Embodiment one | Embodiment two | Embodiment three |
| 1. extension elongation | 75mm | 80 mm | 85 mm |
| 2. flash loss | 21mm | 22.4 mm | 24 mm |
| 3. upset allowance | 4mm | 6 mm | 7.5 mm |
| 4. glisten initial velocity | 0.16mm/s | 0.20 mm/s | 0.30 mm/s |
| 5. flash of light termination speed | 1.15mm/s | 1.35 mm/s | 1.55 mm/s |
| 6. flashing current | 4.8kA | 6kA | 7.2kA |
| 7. upset speed | 30mm/s | 33 mm/s | 35 mm/s |
| 8. upset force | 9.5MPa | 10 Mpa | 11 Mpa |
| 9. charged upset time | 0.1s | 0.3s | 0.5s |
| 10. clamping force | 11MPa | 11.5 MPa | 12 MPa |
The pipe joint hot strength of said method welding forming is higher than mother metal, and ductile fracture is in mother metal, joint lateral bending 180 ° of flawlesses, welding quality is good, reaches GB5310-2008 " seamless steel tubes and pipes for high pressure boiler " and API1104-2008 " pipe line steel solder technology specification " standard regulation.
The present invention is described by embodiment, but the present invention is not construed as limiting, with reference to description of the invention, other changes of the disclosed embodiments, as the professional person for this area easily expects, such change should belong within the scope of the claims in the present invention restriction.
Claims (4)
1. a flash butt welding process for high-pressure boiler pipeline, to weld pipeline material be No. 20 carbon steel, diameter is 219mm, and wall thickness is 14 ~ 16mm, it is characterized in that this welding procedure comprises the steps: A) pre-welding treatment is carried out to two pipelines to be welded; B) pipeline clamping; C) welding condition setting; D) glisten; E) upset; F) pressurize; G) weld seam burr removing; Wherein, welding condition is set as: each pipeline extension elongation L to be welded
1be 75 ~ 85mm, flash loss is 21 ~ 24mm, and upset allowance is 4 ~ 7.5mm, and flash of light initial velocity is 0.16 ~ 0.30mm/s, flash of light termination speed is 1.15 ~ 1.55mm/s, flashing current is 4.8kA ~ 7.2kA, and upset speed is 30 ~ 35mm/s, and upset force is 9.5 ~ 11MPa, charged upset time is 0.1 ~ 0.5s, clamping force is 11 ~ 12MPa, and secondary voltage is 6 ~ 7V, and weld interval is 185 ~ 230s.
2. the flash butt welding process of high-pressure boiler pipeline according to claim 1, is characterized in that the technique of above-mentioned each pipeline pre-welding treatment to be welded is as follows:
Be 10 to the end face bevel angle a to be welded of each pipeline to be welded
o± 2
o;
The periphery of each pipeline to be welded is polished, polishing length L
2for more than the 300mm that outwards polishes from the outer rim of groove along pipeline axial.
3. the flash butt welding process of high-pressure boiler pipeline according to claim 1, is characterized in that the technique of above-mentioned pipeline clamping is as follows:
The end face parallel clearance b to be welded of two pipelines to be welded
1be 1 ~ 2mm;
The inwall misplacement space b of two pipelines to be welded
2< 1mm.
4. the flash butt welding process of high-pressure boiler pipeline according to claim 1, it is characterized in that above-mentioned weld seam burr removing adopts push broach machinery to remove the outside burr of weld seam after welding immediately, and adopt plasma scarfing cinder technology to remove the inner burr of weld seam, inside and outside ensureing weld seam, reinforcement is no more than 1.5mm.
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| CN201410694523.0A CN104400200A (en) | 2014-11-27 | 2014-11-27 | Flash butt welding process for high-pressure boiler pipeline |
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|---|---|---|---|
| CN201410694523.0A CN104400200A (en) | 2014-11-27 | 2014-11-27 | Flash butt welding process for high-pressure boiler pipeline |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763332A (en) * | 2017-09-27 | 2018-03-06 | 袁月卫 | A kind of interior conduit production and installation method |
| CN108746962A (en) * | 2018-06-29 | 2018-11-06 | 上海振华重工(集团)股份有限公司 | Portal crane box beam partition board flash butt welding method |
| CN109079301A (en) * | 2018-08-21 | 2018-12-25 | 安徽亚太锚链制造有限公司 | A kind of efficient chain link takes a mouthful flash-butt welding process |
| CN113210820A (en) * | 2021-04-25 | 2021-08-06 | 成都交大焊接科技有限公司 | Flash welding method |
| CN115178908A (en) * | 2022-04-27 | 2022-10-14 | 广船国际有限公司 | Welding method of flat bulb steel for polar ship and polar ship |
| CN115401292A (en) * | 2022-05-11 | 2022-11-29 | 中北大学 | Wire connecting equipment and method for magnesium alloy electric arc additive manufacturing |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763332A (en) * | 2017-09-27 | 2018-03-06 | 袁月卫 | A kind of interior conduit production and installation method |
| CN108746962A (en) * | 2018-06-29 | 2018-11-06 | 上海振华重工(集团)股份有限公司 | Portal crane box beam partition board flash butt welding method |
| CN109079301A (en) * | 2018-08-21 | 2018-12-25 | 安徽亚太锚链制造有限公司 | A kind of efficient chain link takes a mouthful flash-butt welding process |
| CN113210820A (en) * | 2021-04-25 | 2021-08-06 | 成都交大焊接科技有限公司 | Flash welding method |
| CN115178908A (en) * | 2022-04-27 | 2022-10-14 | 广船国际有限公司 | Welding method of flat bulb steel for polar ship and polar ship |
| CN115178908B (en) * | 2022-04-27 | 2023-09-19 | 广船国际有限公司 | Welding method of flat bulb steel for polar region ship and polar region ship |
| CN115401292A (en) * | 2022-05-11 | 2022-11-29 | 中北大学 | Wire connecting equipment and method for magnesium alloy electric arc additive manufacturing |
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Effective date of registration: 20161027 Address after: 510651 Changxin Road, Guangzhou, Guangdong, No. 363, No. Applicant after: Guangdong Institute of welding technology (Guangdong Institute of China and Ukraine) Address before: 510651 Changxin Road, Guangzhou, Guangdong, No. 363, No. Applicant before: GUANGDONG RESEARCH INSTITUTE OF INDUSTRIAL TECHNOLOGY (GUANGZHOU RESEARCH INSTITUTE OF NON-FERROUS METALS) |
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