CN102615395B - Method for welding single-arc double-wire pipelines - Google Patents
Method for welding single-arc double-wire pipelines Download PDFInfo
- Publication number
- CN102615395B CN102615395B CN201210128738.7A CN201210128738A CN102615395B CN 102615395 B CN102615395 B CN 102615395B CN 201210128738 A CN201210128738 A CN 201210128738A CN 102615395 B CN102615395 B CN 102615395B
- Authority
- CN
- China
- Prior art keywords
- welding
- pipeline
- pipelines
- welding machine
- welded
- 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.)
- Active
Links
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a method for welding single-arc double-wire pipelines, and belongs to the technical field of welding of oil and gas pipelines. The method comprises the following steps of: processing grooves at pipe ends of two pipelines to be welded respectively, and butting the grooves of the two pipelines through a butting function of an internal welding machine; setting welding working parameters of the internal welding machine and an all-position automatic welding machine for the single-arc double-wire pipelines; preheating pipe orifices to be welded to over 50 DEG C, performing root welding on the pipe orifices to be welded by using the internal welding machine; performing hot welding, filling welding and cosmetic welding from inside to outside on the pipe orifices subjected to the root welding by using the all-position automatic welding machine for the single-arc double-wire pipelines until the circumferential surface of a welding seam is not lower than the surfaces of the outer walls of the pipelines; and performing filling welding on a plurality of layers, wherein the filling welding height of each layer is not less than 4 mm. By the method for welding the single-arc double-wire pipelines, the welding efficiency of large-caliber thick-wall pipelines can be effectively increased, and the method has the advantages of high welding deposition efficiency, high welding speed, small heat input, stable heat affected zone and high welding seam mechanical properties.
Description
Technical field
The present invention relates to oil and gas pipes welding technology field, particularly a kind of two electrodes tandemarc method for welding pipeline.
Background technology
Along with long-distance oil & gas pipeline heavy caliber, the large sustainable development in wall thickness direction and the pursuit day by day to efficiency of construction, more and more urgent to the demand of efficient welding technology in the industry.For improving pipeline construction efficiency, automatic welder(welding machine) and the welding procedure of various ways are emerged in large numbers like the mushrooms after rain, significantly promote although these solder technology have had in speed of welding, but owing to being difficult to have breakthrough on layer thickness, cause the room for promotion of welding efficiency to have the limitation of certain degree.Therefore, the welding efficiency how fundamentally improving pipeline has become technical barrier urgently to be resolved hurrily in pipeline construction construction.
Summary of the invention
The problems such as the welding efficiency caused is low are limited in order to solve layer thickness in existing large-diameter thick-walled pipeline welding procedure, the invention provides a kind of two electrodes tandemarc method for welding pipeline, described method comprises: carry out retaining wall on slope respectively to the pipe end of two pipelines to be welded, and by the counterpart functional realiey of internal welding machine to the counterpart at two tube groove places; The welding job parameter of internal welding machine and two electrodes tandemarc pipeline all-position auto-welding machine is set; By more than pipe end preheating to 50 to be welded DEG C, utilize described internal welding machine to treat welded tube mouth and carry out root bead; Utilize described two electrodes tandemarc pipeline all-position auto-welding machine to the mouth of pipe after root bead, carry out hot weld from the inside to the outside respectively, fill weldering and cosmetic welding, until the circumferential surface of weld seam is not less than pipeline outer wall surface; Described filling is welded with multilayer, and the filling welding and assembling height of every layer is not less than 4mm; The bevel shape at described two pipeline butt places is narrow gap " U " type; The parameter of described " U " type groove comprises: bevel angle A is 5 ~ 7 degree, groove width w is 5 ~ 7mm, chamfer angle B is 36.5 ~ 38.5 degree, chamfer height h is 0.4 ~ 0.6mm, arc radius R is 3.2mm, arc transition width q=0.1mm, width of root face e are 1.3 ~ 1.7mm, and mouth of pipe group is to unfitness of butt joint c≤1.5mm; The welding job parameter of described two electrodes tandemarc pipeline all-position auto-welding machine comprises: weldingvoltage is 23 ~ 25V; welding current is 200 ~ 230A; gage of wire Φ is 1.0mm, and speed of welding is 80 ~ 100cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20.
The welding job parameter of described internal welding machine comprises: weldingvoltage is 23 ~ 25V, and welding current is 200 ~ 230A, and gage of wire Φ is 0.9mm, and speed of welding is 80 ~ 100cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20.
Two electrodes tandemarc method for welding pipeline provided by the invention, can improve the welding efficiency of large-diameter thick-walled pipeline effectively, and have welding deposition rate large, speed of welding is fast, heat input is little, heat affected area is stable and weld properties advantages of higher.
Accompanying drawing explanation
Fig. 1 is the tube groove sectional view of embodiment of the present invention two electrodes tandemarc pipeline welding;
Fig. 2 is the counterpart tube groove sectional view of embodiment of the present invention two electrodes tandemarc pipeline welding;
Fig. 3 is the counterpart pipeline unfitness of butt joint schematic diagram of embodiment of the present invention two electrodes tandemarc pipeline welding;
Fig. 4 is the welding effect schematic diagram of embodiment of the present invention internal welding machine root bead;
Fig. 5 is the tube groove loading schematic diagram of existing traditional all positon pipeline welding;
Fig. 6 is the tube groove loading schematic diagram of embodiment of the present invention two electrodes tandemarc pipeline welding;
Fig. 7 is the tube groove layer weldering high-level schematic of existing traditional all positon pipeline welding;
Fig. 8 is the tube groove layer weldering high-level schematic of embodiment of the present invention two electrodes tandemarc pipeline welding.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical solution of the present invention is further described.
The two electrodes tandemarc method for welding pipeline based on internal welding machine root bead that the embodiment of the present invention provides, pipeline individual layer throat thickness can be increased, thus effectively improve the welding efficiency of large-diameter thick-walled pipeline, and have welding deposition rate large, speed of welding is fast, heat input is little, heat affected area is stable and weld properties advantages of higher, can solve simultaneously lack of penetration, welding bead is discontinuous and the weld defect such as undercut, ensure that welding quality.The embodiment of the present invention uses based on the two electrodes tandemarc pipeline welding process of internal welding machine root bead, to solve the defects such as the weld seam incomplete fusion, slag inclusion and the pore that occur in existing all position automatic welding technique.The two electrodes tandemarc pipeline welding process based on internal welding machine root bead of the present embodiment is applicable to that wall thickness is 14.2 ~ 32mm, diameter of phi is 813mm ~ 1422mm, the oil and gas pipes of grade of steel >=X70.Meet the large-caliber gas-oil pipeline 1 and 2 of above-mentioned size below with two, an internal welding machine and a two electrodes tandemarc all-position automatic welder (comprising 2 welding tractors) are example, elaborate specific embodiment of the invention scheme, comprise the following steps:
Step 101, carries out retaining wall on slope respectively to the pipe end of large-caliber gas-oil pipeline 1 and 2 to be welded, and passes through the gapless counterpart at the counterpart functional realiey two tube groove place of internal welding machine, the unfitness of butt joint c≤1.5mm of counterpart pipeline 1 and 2, as shown in Figures 1 to 3.Two electrodes tandemarc all-position automatic welding technology technological requirement pipeline butt gapless, and after counterpart, groove width w is 5 ~ 7mm; In two electrodes tandemarc automatic Arc Welding, molten bath is comparatively large, slag easy emersion during for making welding, and adopt the arc transition that size is slightly large, through repetition test, selected arc radius is R=3.2mm; In conjunction with feature and the bevel angle that at present all-position welding technique is conventional of two electrodes tandemarc automatic welder(welding machine), being 5 ~ 7 degree through testing selected bevel angle A, is that the circular arc of 3.2mm is tangent with the radius selected; During for making welding, liquation can penetration root face part and easy-formation better, and set a horizontal transition section at the intersection of circular arc and root face, its width q is 0.1mm; Two electrodes tandemarc automatic welding has wide molten bath and dark fusibleness, for make root face well by penetration to realize the appearance of weld of pipeline inner face, determine that width of root face e is 1.3 ~ 1.7mm through test; In order to realize the appearance of weld of pipeline inner face well, at the inner-walls of duct mouth of pipe, place arranges chamfering, and chamfer angle B is 36.5 ~ 38.5 degree, and chamfer height h is 0.4 ~ 0.6mm.Groove shown in Fig. 1 ensure bevel angle and pipeline gapless group to groove width in given size range, under groove straightway and the tangent prerequisite of circular arc, root face connects with a certain position of circular arc, and joint setting horizontal transition section, so the arc section of this groove is less than 1/4 circle.As seen from Figure 2, the bevel shape at two pipeline butt places is narrow gap " U " type, this " U " type groove is specially adapted to two electrodes tandemarc all-position automatic welding technology technology, and compared with the groove type generally adopted with current all-position automatic welding technology, packed space needed for bevel for welding reduces to some extent, thus shorten welding required time, improve the efficiency of pipeline girth weld day welding.
Step 102, arranges the welding job parameter of internal welding machine and two electrodes tandemarc pipeline all-position auto-welding machine.The welding job parameter of internal welding machine comprises: weldingvoltage is 23 ~ 25V, and welding current is 200 ~ 230A, and gage of wire Φ is 0.9mm, and speed of welding is 80 ~ 100cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20.The welding job parameter of two electrodes tandemarc pipeline all-position auto-welding machine comprises: weldingvoltage is 23 ~ 25V, and welding current is 200 ~ 230A, and gage of wire Φ is 1.0mm, and speed of welding is 80 ~ 100cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20.In welding process, the hybrid protection gas that two electrodes tandemarc pipeline all-position auto-welding machine uses can be, but not limited to be CO
2and Ar, other protective gas can also be used, such as CO
2and O
2.Under normal circumstances, in order to make the better penetration of root face to reach the molding effect of pipeline inside weld the best, larger welding current and CO can be used
2the mixed gas protected gas that proportion is larger.In the present embodiment, two electrodes tandemarc pipeline all-position auto-welding machine is equipped with 4 special welding power supplys.
Step 103, by more than the pipe end preheating to 50 of pipeline 1 and pipeline 2 DEG C, utilizes internal welding machine to carry out root bead to " U " type groove place.After setting the running parameter of internal welding machine, just can to group to after pipeline 1,2 carry out root bead 3, stop after internal welding machine welds one week along pipe circumference, root bead is shaping rear to its back chipping, guarantees back chipping quality.Should ensure during root bead that liquation has fusion penetration large as far as possible in root face part, ensure that " wearing silk " phenomenon is not appearred in root face by penetration again, to make root bead effect better, as shown in Figure 4.
Step 104, utilizes two electrodes tandemarc pipeline all-position auto-welding machine to " U " type groove after root bead, carries out hot weld from the inside to the outside respectively, fills weldering and cosmetic welding, until the circumferential surface at " U " type groove place is not less than pipeline outer wall surface.As shown in Figure 8, after root bead is complete, utilize the two electrodes tandemarc pipeline all-position auto-welding machine setting welding job parameter, carry out hot weld 4 in order, fill weldering 5 and cosmetic welding 6, then carry out hot weld 4 in order, fill weldering 5 and cosmetic welding 6, the technological parameter all first set according to different layer before weldering carries out the setting of welding parameter, and postwelding all should scarfing cinder, in the hope of good welding effect.Wherein, hot weld, filling are welded and the welding parameter of cosmetic welding is: weldingvoltage is 23 ~ 25V, and welding current is 200 ~ 230A, and gage of wire Φ is 1.0mm, and speed of welding is 80 ~ 100cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20.The adjusting range of the welding gun on welding tractor: adjustment up and down, left and right adjustment are ± 50mm, and angle adjustment is 0 ~ 10 degree.In whole welding process, the welding parameter control system butt welding point Distribution Value observing and controlling constantly of two electrodes tandemarc pipeline all-position auto-welding machine, and calculate the adjustment in good time of speed of welding do, to make welding effect better through piecewise interpolation; By hot weld to cosmetic welding, groove width increases gradually, loading also increases relatively, for ensureing good filling effect, speed of welding should as the case may be with require suitably to slow down.As can be seen from Fig. 5 and Fig. 6, narrow gap " U " type groove is compared with traditional groove, its bevel angle A < A ', groove width W < W ', root face height e > e ', so, the packing volume of narrow gap " U " type groove is less than the packing volume of traditional groove, effectively can improve welding efficiency.As can be seen from Fig. 7 and Fig. 8, in tradition all positon pipeline welding process, the filling welding and assembling height of every layer is less than the present embodiment based on the filling welding and assembling height of every layer in the two electrodes tandemarc pipeline welding process of internal welding machine root bead, for the groove of same size, the present embodiment is less than the number of plies (in figure being 4 layers) of filling weldering in traditional all positon pipeline welding based on the number of plies (in figure being 2 layers) of filling weldering in the two electrodes tandemarc welding procedure of internal welding machine root bead, thus decrease the number of times of filling weldering, improve speed of welding.In concrete pipeline welding, the present embodiment is not less than 4mm based on the filling welding and assembling height of every layer in the welding procedure of internal welding machine root bead, greatly reduces the number of times of filling weldering, improves welding efficiency.
In the welding procedure of oil and gas pipes, welding quality and speed of welding are the key factors affecting welding efficiency.Under the prerequisite guaranteeing welding quality, the raising of speed of welding is the key point that pipeline welding efficiency improves, and the raising of speed of welding is not only embodied in the welding machine speed of travel, is also embodied on individual layer throat thickness.The present embodiment is based on the two electrodes tandemarc method for welding pipeline of internal welding machine root bead, under proprietary narrow gap " U " type groove, pipeline individual layer throat thickness is made to be promoted to more than 4mm, span in traditional automatic welding process the obstacle of the single layer welding thickness 2 ~ 3mm being difficult to go beyond, and appearance of weld is attractive in appearance, mechanical property is good, and welding efficiency more than 25% can effectively be improved in existing automatic welding basis, meets the needs of pipe-line construction engineering high efficiency construction completely.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a two electrodes tandemarc method for welding pipeline, is characterized in that, described method comprises: carry out retaining wall on slope respectively to the pipe end of two pipelines to be welded, and by the counterpart functional realiey of internal welding machine to the counterpart at two tube groove places; The welding job parameter of internal welding machine and two electrodes tandemarc pipeline all-position auto-welding machine is set; By more than pipe end preheating to 50 to be welded DEG C, utilize described internal welding machine to treat welded tube mouth and carry out root bead; Utilize described two electrodes tandemarc pipeline all-position auto-welding machine to the mouth of pipe after root bead, carry out hot weld from the inside to the outside respectively, fill weldering and cosmetic welding, until the circumferential surface of weld seam is not less than pipeline outer wall surface; Described filling is welded with multilayer, and the filling welding and assembling height of every layer is not less than 4mm; The bevel shape at described two pipeline butt places is narrow gap " U " type; The parameter of described " U " type groove comprises: bevel angle A is 5 ~ 7 degree, groove width w is 5 ~ 7mm, chamfer angle B is 36.5 ~ 38.5 degree, chamfer height h is 0.4 ~ 0.6mm, arc radius R is 3.2mm, arc transition width q=0.1mm, width of root face e are 1.3 ~ 1.7mm, and mouth of pipe group is to unfitness of butt joint c≤1.5mm; The welding job parameter of described two electrodes tandemarc pipeline all-position auto-welding machine comprises: weldingvoltage is 23 ~ 25V; welding current is 200 ~ 230A; gage of wire Φ is 1.0mm, and speed of welding is 80 ~ 100cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20.
2. two electrodes tandemarc method for welding pipeline as claimed in claim 1; it is characterized in that; the welding job parameter of described internal welding machine comprises: weldingvoltage is 23 ~ 25V; welding current is 200 ~ 230A; gage of wire Φ is 0.9mm; speed of welding is 80 ~ 100cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210128738.7A CN102615395B (en) | 2012-04-27 | 2012-04-27 | Method for welding single-arc double-wire pipelines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210128738.7A CN102615395B (en) | 2012-04-27 | 2012-04-27 | Method for welding single-arc double-wire pipelines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102615395A CN102615395A (en) | 2012-08-01 |
| CN102615395B true CN102615395B (en) | 2015-02-25 |
Family
ID=46555790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210128738.7A Active CN102615395B (en) | 2012-04-27 | 2012-04-27 | Method for welding single-arc double-wire pipelines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102615395B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102922105A (en) * | 2012-11-16 | 2013-02-13 | 靳红星 | Semi-automatic welding process for self-shielded flux-cored wire |
| CN104209635B (en) * | 2013-06-05 | 2017-02-08 | 中国石油天然气集团公司 | Pipeline multipoint synchronous automatic welding process |
| CN103658926A (en) * | 2013-11-25 | 2014-03-26 | 唐山轨道客车有限责任公司 | Pipe-pipe butt joint system and construction method of pipe-pipe butt joint system |
| CN105252114A (en) * | 2015-10-26 | 2016-01-20 | 中国石油天然气集团公司 | Pipeline welding process for sloping field |
| CN105522260A (en) * | 2016-02-03 | 2016-04-27 | 江苏电力装备有限公司 | Narrow-gap argon arc automatic welding method of thick-wall pipes |
| CN108098110A (en) * | 2016-11-25 | 2018-06-01 | 中国石油天然气集团公司 | A kind of welding method of hillside fields pipeline |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3727025A (en) * | 1970-03-24 | 1973-04-10 | Rig Hammers Inc | Method for welding vertically extending pipe sections together |
| CN101850454A (en) * | 2009-03-31 | 2010-10-06 | 中国石油天然气管道局 | Welding process of heavy-calibre long-distance steel pipeline |
-
2012
- 2012-04-27 CN CN201210128738.7A patent/CN102615395B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3727025A (en) * | 1970-03-24 | 1973-04-10 | Rig Hammers Inc | Method for welding vertically extending pipe sections together |
| CN101850454A (en) * | 2009-03-31 | 2010-10-06 | 中国石油天然气管道局 | Welding process of heavy-calibre long-distance steel pipeline |
Non-Patent Citations (3)
| Title |
|---|
| CRC EVANS 全自动焊技术在西气东输二线管道工程中的应用;李远智;《石油工程建设》;20091031;第35卷(第5期);第29页右栏－第30页左栏，第32页左栏 4 效益分析部分 * |
| US 3727025 A, * |
| 我国长输管道焊接技术进展及发展方向;曹永利等;《石油科技论坛》;20120225(第1期);第8页 1.6 大口径管道单弧双丝自动焊机设备研制部分 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102615395A (en) | 2012-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102658415B (en) | Single-arc twin-wire pipeline welding method | |
| CN102615395B (en) | Method for welding single-arc double-wire pipelines | |
| CN102581431B (en) | All-position welding method for single-arc double-wire pipeline | |
| CN102009251B (en) | Full-position welding method for pipeline by full-automatic external welding machine | |
| CN104014909B (en) | Method for welding pipeline | |
| CN103612001B (en) | A kind of composite bimetal pipe pipe end sealing welding technique for extra based on R shape groove | |
| CN103801796A (en) | All-position automatic welding method for pipeline circumferential weld | |
| CN102294545B (en) | Laser penetration welding seam formation control method for Hass alloy conductive roller | |
| CN104493342A (en) | Medium thickness plate X-shaped bevel welding technology without back chipping | |
| CN104339123A (en) | Bimetal composite pipe welding method | |
| CN204975757U (en) | Thick wall is taken over and is ridden a formula one side welding welding groove | |
| CN110744181A (en) | Automatic welding process for large-diameter long-distance pipeline | |
| CN110788450A (en) | Vertical fillet welding non-back-gouging welding method for double-sided double-robot T-shaped connector of medium plate | |
| CN102581432B (en) | Single-arc twin-wire pipeline all-position welding method | |
| CN111014901A (en) | Automatic self-melting TIG welding method for thin-wall stainless steel pipe | |
| CN109514086B (en) | Continuous tube all-position laser welding process method | |
| CN101704164B (en) | High-energy beam current welding penetration multiplying method | |
| CN105583499A (en) | Full-automatic welding method for metal powder-cored wire pipeline girth welding joints | |
| CN104785931A (en) | Plasma-submerged arc hybrid welding system and welding method thereof | |
| CN104209635A (en) | Pipeline multipoint synchronous automatic welding process | |
| CN104191096A (en) | Welding structure of hydraulic cylinder jacket and processing technology thereof | |
| CN103286528B (en) | Processing technology for longitudinal-seam narrow-gap welding groove of thick-walled barrels | |
| CN104588834A (en) | Welding method for straight seam steel pipe | |
| CN102310249A (en) | Welding method of composite hose stainless steel joint | |
| CN210908610U (en) | Large-caliber long-distance pipeline |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170301 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: China National Petroleum Corporation Patentee after: China Petroleum Pipeline Bureau Engineering Co., Ltd. Address before: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee before: China National Petroleum Corporation Patentee before: China Petroleum and Natural Gas Pipeline Bureau |