CN102581432B - Single-arc twin-wire pipeline all-position welding method - Google Patents
Single-arc twin-wire pipeline all-position welding method Download PDFInfo
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- CN102581432B CN102581432B CN201210065251.9A CN201210065251A CN102581432B CN 102581432 B CN102581432 B CN 102581432B CN 201210065251 A CN201210065251 A CN 201210065251A CN 102581432 B CN102581432 B CN 102581432B
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Abstract
The invention discloses a single-arc twin-wire pipeline all-position welding method, which belongs to the technical field of oil-gas pipeline welding. The method includes the steps: chamfering ends of two pipelines to be welded, and aligning grooves of the two pipelines through an inner pipeline aligning device; preheating pipe orifices to be welded to reach the temperature higher than 50 DEG C, and setting welding parameters of a single-arc twin-wire pipeline all-position automatic welding machine; and respectively performing root welding, heat welding, filling welding and cosmetic welding for the pipe orifices to be welded from inside to outside by the aid of the single-arc twin-wire pipeline all-position automatic welding machine until the circumferential surface of a welding line is not lower than the outer wall surface of each pipeline. The single-arc twin-wire pipeline all-position welding method can be used for simultaneously melting double welding wires in the same melting area, increasing the filling quantity of the welding wires within unit time, shortening welding time, increasing welding speed and improving the daily welding efficiency for circumferential weld of a unit.
Description
Technical field
The present invention relates to oil and gas pipes welding technology field, particularly a kind of two electrodes tandemarc pipeline all position welding method.
Background technology
Along with the development of China's energy industry, petroleum-gas pipeline engineering construction has welcome again a peak period.The Central Asia, China and Kazakhstan, Sino-Russian, the second west to east gas pipeline project, transfering natural gas from the west to the east three line, the large-scale pipeline engineerings such as four lines of transferring natural gas from the west to the east have gone into operation or have prepared.
Present stage, oil and gas pipes welding from manual welding step transition to semiautomatic welding, the automatic welding stage, the speed of welding of automatic welding is fast, efficiency is high, simple to operate, reduces the labour intensity of welder.Along with pipeline automatic welding connection technology and equipment applying in pipeline construction, all-position automatic welding technology technology becomes mainstream technology in pipeline construction construction.At present all position automatic welding technique in construction, easily there is the defects such as weld seam incomplete fusion, slag inclusion and pore, be with weld seam incomplete fusion defect especially.Existing solution is the testing result according to scene, and adjustment welding parameter is to overcome weld seam incomplete fusion defect in time.But the accommodation of this adjustment welding parameter is narrow, higher to the scene adjustment level requirement of technical staff.How to determine rational all-position automatic welding of pipelines technological parameter and corresponding welding method, to improve pipeline welding efficiency, become a technical problem urgently to be resolved hurrily.
Summary of the invention
Not easily to fuse and welding parameter such as not easily to adjust at the problem to solve weld seam in existing all positon pipeline automatic welding process, the invention provides a kind of two electrodes tandemarc pipeline all position welding method, described method comprises: carry out retaining wall on slope respectively to the pipe end of two pipelines to be welded, and realizes the counterpart to two tube groove places by pipeline internal clamp; By more than pipe end preheating to 50 to be welded DEG C, the welding job parameter of two electrodes tandemarc pipeline all-position auto-welding machine is set; Utilize described two electrodes tandemarc pipeline all-position auto-welding machine to the described mouth of pipe to be welded, carry out root bead, hot weld, filling weldering and cosmetic welding respectively from the inside to the outside, until the circumferential surface of weld seam is not less than pipeline outer wall surface.
The bevel shape at described two pipeline butt places is " U " type.
The welding job parameter of described two electrodes tandemarc pipeline all-position auto-welding machine comprises: weldingvoltage is 23 ~ 24V; welding current is 210 ~ 230A; gage of wire Φ is 1.0mm, and speed of welding is 100 ~ 150cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20.
The parameter of described " U " type groove comprises: bevel angle A is 5 ~ 7 degree, groove width w is 8 ~ 10mm, chamfer angle B is 60 degree, chamfer height h is 0.4 ~ 0.6mm, arc radius R is 3.2mm, and arc transition width q=0.1mm, width of root face e are 1.3 ~ 1.7mm, mouth of pipe group to unfitness of butt joint c≤1.5mm, cosmetic welding width w
1≤ 12mm.
Two electrodes tandemarc pipeline all position welding method provided by the invention, can realize two welding wire melting while same melting zone, add the loading of welding wire in the unit interval, shorten weld interval, improve speed of welding and unit day welding ring weld seam efficiency.
Accompanying drawing explanation
Fig. 1 is the tube groove sectional view of embodiment of the present invention two electrodes tandemarc pipeline all position welding;
Fig. 2 is the counterpart tube groove sectional view of embodiment of the present invention two electrodes tandemarc pipeline all position welding;
Fig. 3 is the counterpart pipeline unfitness of butt joint schematic diagram of embodiment of the present invention two electrodes tandemarc pipeline all position welding;
Fig. 4 is the welding process schematic diagram of embodiment of the present invention two electrodes tandemarc pipeline all position welding.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical solution of the present invention is further described.
In automatic welding of pipelines technique, because the welding current density of two electrodes tandemarc non-rotating pipeline girth weld all-position automatic welder is high, molten bath is naturally molten roomy, therefore can be used for solving in weld seam the various defects occurred, and have that welding parameter accommodation is wide, efficiency of construction high.The embodiment of the present invention uses the welding procedure of this automatic welder(welding machine), realizes two electrodes tandemarc pipeline all position welding, 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.Be 17.5mm below with wall thickness, diameter be Φ 1016, the oil and gas pipes of grade of steel >=X70, a Φ 1016 is with brass internal clamp and a two electrodes tandemarc all-position automatic welder (comprising 2 welding tractors) to be 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 oil and gas pipes 1 and 2 to be welded, and the gapless counterpart by being with the pipeline internal clamp of brass to realize two tube groove places, the unfitness of butt joint c≤1.5mm of counterpart pipeline 1 and 2, as shown in Figures 1 to 3.Two electrodes tandemarc non-rotating pipeline girth weld all-position automatic welding technology technological requirement pipeline butt gapless, and after counterpart, groove width w is 8 ~ 10mm; 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 60 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 " 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, by more than the pipe end preheating to 50 of pipeline 1 and pipeline 2 DEG C, arranges the welding job parameter of two electrodes tandemarc pipeline all-position auto-welding machine.Welding job parameter comprises: weldingvoltage is 23 ~ 24V, and welding current is 210 ~ 230A, and gage of wire Φ is 1.0mm, and speed of welding is 100 ~ 150cm/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 the TPS3200 type special welding power supply that 4 Austrian Fu Nisi produce.
Step 103, utilizes two electrodes tandemarc pipeline all-position auto-welding machine to " U " type groove, carries out root bead, hot weld, filling weldering and cosmetic welding respectively from the inside to the outside, until the circumferential surface at " U " type groove place is not less than pipeline outer wall surface.As shown in Figure 4, after the running parameter setting two electrodes tandemarc pipeline all-position auto-welding machine, just can to group to after pipeline 1,2 carry out root bead 3, stop after two electrodes tandemarc all positon automatic pipeline welder welds one week along pipe circumference, root bead is shaping rear to its back chipping, guarantees back chipping quality; After root bead, 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, the welding parameter of root bead, hot weld, filling weldering and cosmetic welding is: weldingvoltage is 23 ~ 24V, and welding current is 210 ~ 230A, and gage of wire Φ is 1.0mm, and speed of welding is 100 ~ 150cm/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; Speed of welding is slack-off gradually to cosmetic welding by root bead, because root bead place groove is narrow, the loading of needs is little, so speed of welding can suitably tune up; And 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.In addition, fill weldering to carry out several times, until stop when the range difference between face of weld height and pipeline external surface is 1-2mm; Cosmetic welding can complete by one or many, cosmetic welding width w
1≤ 12mm.
The two electrodes tandemarc pipeline all position welding method that the present embodiment provides, two welding wire melting while same melting zone can be realized, add the loading of welding wire in the unit interval, shorten weld interval, improve speed of welding and unit day welding ring weld seam efficiency, make the welding efficiency of two electrodes tandemarc pipeline position automatic welding improve 15% than the welding efficiency of existing single welding torch pipeline position automatic welding, welding first-time qualification rate improves 1-2%, reaches more than 97%.
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 (1)
1. a two electrodes tandemarc pipeline all position welding method, 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 realizes the counterpart to two tube groove places by pipeline internal clamp; By more than pipe end preheating to 50 to be welded DEG C, the welding job parameter of two electrodes tandemarc pipeline all-position auto-welding machine is set; Utilize described two electrodes tandemarc pipeline all-position auto-welding machine to the described mouth of pipe to be welded, carry out root bead, hot weld, filling weldering and cosmetic welding respectively from the inside to the outside, until the circumferential surface of weld seam is not less than pipeline outer wall surface; The bevel shape at described two pipeline butt places is " U " type; The welding job parameter of described two electrodes tandemarc pipeline all-position auto-welding machine comprises: weldingvoltage is 23 ~ 24V; welding current is 210 ~ 230A; gage of wire Φ is 1.0mm, and speed of welding is 100 ~ 150cm/min, and the percent by volume of mixed gas protected gas is CO
2/ Ar=60 ~ 80/40 ~ 20; The parameter of described " U " type groove comprises: bevel angle A is 5 ~ 7 degree, groove width w is 8 ~ 10mm, chamfer angle B is 60 degree, chamfer height h is 0.4 ~ 0.6mm, arc radius R is 3.2mm, and arc transition width q=0.1mm, width of root face e are 1.3 ~ 1.7mm, mouth of pipe group to unfitness of butt joint c≤1.5mm, cosmetic welding width w
1≤ 12mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210065251.9A CN102581432B (en) | 2012-03-13 | 2012-03-13 | Single-arc twin-wire pipeline all-position welding method |
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| CN201210065251.9A CN102581432B (en) | 2012-03-13 | 2012-03-13 | Single-arc twin-wire pipeline all-position welding method |
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| CN102581432A CN102581432A (en) | 2012-07-18 |
| CN102581432B true CN102581432B (en) | 2014-12-24 |
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| 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 |
| CN105965169B (en) * | 2016-06-08 | 2018-10-23 | 郑州煤矿机械集团股份有限公司 | A kind of double end movable post welding method |
| 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 (1)
| 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 |
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Patent Citations (1)
| 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 |
Non-Patent Citations (2)
| 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3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 * |
| 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》;20120229(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 * |
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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 |