CN102581432A - 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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- CN102581432A CN102581432A CN2012100652519A CN201210065251A CN102581432A CN 102581432 A CN102581432 A CN 102581432A CN 2012100652519 A CN2012100652519 A CN 2012100652519A CN 201210065251 A CN201210065251 A CN 201210065251A CN 102581432 A CN102581432 A CN 102581432A
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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 the oil and gas pipes welding technology field, particularly a kind of single arc mariages pipeline all position welding method.
Background technology
Along with the development of China's energy industry, the oil and gas pipeline engineering construction has welcome the peak period again one time.Large-scale pipeline engineerings such as the Central Asia, China and Kazakhstan, Sino-Russian, transfering natural gas from the west to the east two wires, transfering natural gas from the west to the east are three-way, transfering natural gas from the west to the east four lines go into operation or prepare.
Present stage, oil and gas pipes welding is from the manual welding step transition to semiautomatic welding, weld the stage automatically, and the speed of welding of weldering is fast automatically, efficient is high, and is simple to operate, reduced welder's labour intensity.Along with pipeline automatic welding connection technology and equipment applying in pipeline construction, all position automatic welding connection technology becomes mainstream technology in the pipeline construction construction.At present all position automatic welding technology in usefulness is prone to defectives such as weld seam incomplete fusion, slag inclusion and pore in construction, especially with weld seam incomplete fusion defective for.Existing solution is the testing result according to the scene, in time adjusts welding parameter to overcome weld seam incomplete fusion defective.But the accommodation of this adjustment welding parameter is narrow, and technical staff's scene adjustment level is had relatively high expectations.How to confirm rational pipeline all-position automatic soldering technique parameter and corresponding welding method,, become a technical problem that needs to be resolved hurrily to improve pipeline welding efficient.
Summary of the invention
Weld seam is difficult for problems such as fusion and the difficult adjustment of welding parameter in the pipeline automatic welding process of existing full position in order to solve; The invention provides a kind of single arc mariages pipeline all position welding method; Said method comprises: the pipe end to two pipelines to be welded carries out groove processing respectively, and realizes the counterpart to two tube groove places through the pipeline internal clamp; With more than the pipe end preheating to 50 to be welded ℃, the welding job parameter of single arc mariages pipeline all-position auto-welding machine is set; Utilize said single arc mariages pipeline all-position auto-welding machine to the said mouth of pipe to be welded, carry out root bead, hot weld, filling weldering and cosmetic welding from the inside to the outside respectively, be not less than the pipeline outer wall surface until the circumferential surface of weld seam.
The groove at said two pipeline counterpart places is shaped as " U " type.
The welding job parameter of said single arc mariages 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 said " U " type groove comprises: bevel angle A is 5～7 degree, and groove width w is 8～10mm, and chamfer angle B is 60 degree; Chamfering 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 is to unfitness of butt joint c≤1.5mm, cosmetic welding width w
1≤12mm.
Single arc mariages pipeline all position welding method provided by the invention can realize two welding wire fusions in same melting zone, has increased the loading of welding wire in the unit interval, has shortened weld interval, improved speed of welding and unit day the welding ring weld seam efficient.
Description of drawings
Fig. 1 is the tube groove cutaway view of the single arc mariages of embodiment of the invention pipeline all position welding;
Fig. 2 is the counterpart tube groove cutaway view of the single arc mariages of embodiment of the invention pipeline all position welding;
Fig. 3 is the counterpart pipeline unfitness of butt joint sketch map of the single arc mariages of embodiment of the invention pipeline all position welding;
Fig. 4 is the welding process sketch map of the single arc mariages of embodiment of the invention pipeline all position welding.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment, technical scheme of the present invention is further described.
Connect in the technology at pipeline automatic welding; Because the welding current density of the non-rotating pipe girth joint of single arc mariages all-position automatic welder is high, the molten bath is molten roomy naturally; Therefore can be used for solving the various defectives that occur in the weld seam, and have characteristics such as welding parameter accommodation is wide, efficiency of construction height.The embodiment of the invention is used the welding procedure of this automatic welder(welding machine), realizes single arc mariages pipeline all position welding, to solve the defectives such as weld seam incomplete fusion, slag inclusion and pore that occur in the existing all position automatic welding technology.Be that 17.5mm, diameter are the oil and gas pipes of Φ 1016, grade of steel >=X70 below with the wall thickness; It is example that a Φ 1016 is with brass internal clamps and a single arc mariages all-position automatic welder (comprising 2 welding tractors); Come to set forth in detail specific embodiments of the present invention, may further comprise the steps:
Step 101 is carried out groove processing respectively to the pipe end of oil and gas pipes to be welded 1 and 2, and realizes the no gap counterpart at two tube groove places through the pipeline internal clamp of band brass, and counterpart pipeline 1 and unfitness of butt joint c≤1.5mm of 2 are shown in Fig. 1 to 3.The non-rotating pipe girth joint of single arc mariages all position automatic welding connects technological requirement pipeline counterpart is not had the gap, and groove width w is 8～10mm after the counterpart; The molten bath is bigger in the automatic welding process of single arc mariages, and slag is prone to emersion when welding for making, and adopts the big slightly arc transition of size, and through repetition test, selected arc radius is R=3.2mm; In conjunction with the characteristics of single arc mariages automatic welder(welding machine) and present all-position welding technology bevel angle commonly used, be 5～7 degree through the selected bevel angle A of test, with selected radius be that the circular arc of 3.2mm is tangent; For making when welding liquation penetration root face part and easy-formation better, set a horizontal transition section at the intersection of circular arc and root face, its width q is 0.1mm; The automatic soldering set of single arc mariages has wide molten bath and dark fusibleness, for making root face well by the appearance of weld of penetration with realization pipeline inner face, confirms that through test width of root face e is 1.3～1.7mm; In order to realize the appearance of weld of pipeline inner face well, the place is provided with chamfering at the inner-walls of duct mouth of pipe, and chamfer angle B is 60 degree, and chamfering height h is 0.4～0.6mm.Groove shown in Fig. 1 guarantee bevel angle and pipeline do not have dwell set to groove width in given size range, under the tangent prerequisite of groove straightway and circular arc; The a certain position of root face and circular arc joins; And the horizontal transition section is set in the joint, so the arc section of this groove is less than 1/4 circle.Can find out by Fig. 2; The groove at two pipeline counterpart places is shaped as " U " type; This " U " type groove is specially adapted to single arc mariages all position automatic welding connection technology, and connects generally the groove type that adopts with present all position automatic welding and compare, and the required packed space of bevel for welding reduces to some extent; Thereby shortened the welding required time, improved the efficient of pipeline girth weld day welding.
Step 102 with more than the pipe end preheating to 50 of pipeline 1 and pipeline 2 ℃, is provided with the welding job parameter of single arc mariages pipeline all-position auto-welding machine.The 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 employed hybrid protection gas of single arc mariages pipeline all-position auto-welding machine can but to be not limited to be CO
2And Ar, can also use other protective gas, for example CO
2And O
2Generally, in order to make the better penetration of root face, can use bigger welding current and CO to reach the best molding effect of pipeline inside weld
2The mixed gas protected gas that proportion is bigger.In the present embodiment, single arc mariages 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 single arc mariages pipeline all-position auto-welding machine to " U " type groove, carries out root bead, hot weld, filling weldering and cosmetic welding from the inside to the outside respectively, and the circumferential surface until " U " type groove place is not less than the pipeline outer wall surface.As shown in Figure 4; Behind the running parameter that sets single arc mariages pipeline all-position auto-welding machine, just can to the group to after pipeline 1,2 carry out root bead 3, treat that the full position of single arc mariages pipeline automatic welding machine stops after pipe circumference is welded a week; To its back chipping, guarantee the back chipping quality after the root bead moulding; After root bead finishes, carry out hot weld 4 then in order, fill weldering 5 and cosmetic welding 6, the technological parameter of all setting according to different layers earlier before the 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 the welding tractor: adjustment up and down, about adjust and is ± 50mm, angle adjustment is 0～10 to spend.In whole welding process, the observing and controlling constantly of the welding parameter of single arc mariages pipeline all-position auto-welding machine control system's butt welding point distribution value, and the process piecewise interpolation calculates to the adjustment in good time of speed of welding do, so that welding effect is better; Speed of welding is slack-off gradually by root bead to cosmetic welding, because root bead place groove is narrow, the loading of needs is little, so speed of welding can suitably be transferred soon; And by hot weld to cosmetic welding, groove width increases gradually, loading also increases relatively, for guaranteeing good filling effect, speed of welding should be as the case may be with require suitably to slow down.In addition, fill weldering and carry out several times, the range difference up between face of weld height and pipeline external surface stops during for 1-2mm; But the cosmetic welding one or many is accomplished, cosmetic welding width w
1≤12mm.
Single arc mariages pipeline all position welding method that present embodiment provides; Can realize two welding wire fusions in same melting zone, increase the loading of welding wire in the unit interval, shorten weld interval; Improved speed of welding and unit day the welding ring weld seam efficient; The welding efficiency that makes single arc mariages pipeline all-position weld has automatically improved 15% than the welding efficiency that has the automatic weldering of single welding torch pipeline all-position now, welds first-time qualification rate and improves 1-2%, reaches more than 97%.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. single arc mariages pipeline all position welding method is characterized in that said method comprises: the pipe end to two pipelines to be welded carries out groove processing respectively, and realizes the counterpart to two tube groove places through the pipeline internal clamp; With more than the pipe end preheating to 50 to be welded ℃, the welding job parameter of single arc mariages pipeline all-position auto-welding machine is set; Utilize said single arc mariages pipeline all-position auto-welding machine to the said mouth of pipe to be welded, carry out root bead, hot weld, filling weldering and cosmetic welding from the inside to the outside respectively, be not less than the pipeline outer wall surface until the circumferential surface of weld seam.
2. single arc mariages pipeline all position welding method as claimed in claim 1 is characterized in that the groove at said two pipeline counterpart places is shaped as " U " type.
3. single arc mariages pipeline all position welding method as claimed in claim 2; It is characterized in that; The welding job parameter of said single arc mariages pipeline all-position auto-welding machine comprises: weldingvoltage is 23～24V, and welding current is 210～230A, and gage of wire Φ is 1.0mm; 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.
4. single arc mariages pipeline all position welding method as claimed in claim 3 is characterized in that, the parameter of said " U " type groove comprises: bevel angle A is 5～7 degree; Groove width w is 8～10mm, and chamfer angle B is 60 degree, and chamfering 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 is to unfitness of butt joint c≤1.5mm, cosmetic welding width w1≤12mm.
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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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104209635A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气集团公司 | Pipeline multipoint synchronous automatic welding process |
| CN105965169A (en) * | 2016-06-08 | 2016-09-28 | 郑州煤矿机械集团股份有限公司 | Welding method for double-end movable column |
| 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)
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| US3727025A (en) * | 1970-03-24 | 1973-04-10 | Rig Hammers Inc | Method for welding vertically extending pipe sections together |
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2012
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3727025A (en) * | 1970-03-24 | 1973-04-10 | Rig Hammers Inc | Method for welding vertically extending pipe sections together |
Non-Patent Citations (2)
| Title |
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| 曹永利等: "我国长输管道焊接技术进展及发展方向", 《石油科技论坛》, no. 1, 29 February 2012 (2012-02-29) * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209635A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气集团公司 | Pipeline multipoint synchronous automatic welding process |
| 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 |
| CN105965169A (en) * | 2016-06-08 | 2016-09-28 | 郑州煤矿机械集团股份有限公司 | Welding method for double-end movable column |
| 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 |
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| CN102581432B (en) | 2014-12-24 |
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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 |