CN105195872A - Double-sided submerged arc back-chipping-free welding technology for pipeline steel - Google Patents
Double-sided submerged arc back-chipping-free welding technology for pipeline steel Download PDFInfo
- Publication number
- CN105195872A CN105195872A CN201510700666.2A CN201510700666A CN105195872A CN 105195872 A CN105195872 A CN 105195872A CN 201510700666 A CN201510700666 A CN 201510700666A CN 105195872 A CN105195872 A CN 105195872A
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- China
- Prior art keywords
- welding
- weld
- pipe line
- submerged arc
- line steel
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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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
The invention discloses a double-sided submerged arc back-chipping-free welding technology for pipeline steel. The technology comprises the steps that two V-shaped asymmetrical grooves are formed in the pipeline steel, values of the groove angles alpha and beta are set at 60+/-5 degrees and 75+/-5 degrees, no gap exists, the truncated edge b is 3+/-1 mm, the alignment tolerance c is smaller than or equal to 1.5 mm, and the internal groove depth h'' is 3+/-0.5 mm; by regulating and controlling the welding gun position, welding parameters, the interpass temperature and the like, the external groove is firstly welded, then the internal groove is welded, back chipping is not performed, and two-joint-one girth welding of the pipeline steel is achieved; when submerged arc root welding is performed on the external groove, back face protection (by adding welding flux or gaskets) is not needed, and complete welding of the back face is guaranteed by adopting downhill welding; when the internal groove is welded, a large current is adopted, weld penetration is increased by adopting climbing welding; the pre-welding preheating temperature is controlled to be larger than or equal to 80 DEG C, the interpass temperature is controlled to be equal to or smaller than 250 DEG C, and therefore welding cracks are effectively prevented from occurring. According to the double-sided submerged arc back-chipping-free welding technology for the pipeline steel, the higher quality can be achieved in two-joint-one welding of the pipeline steel, back protection and gas shield welding or manual backing are not needed, back chipping is not performed, the procedures are simplified, welding defects caused by backing welding and back chipping are simultaneously eliminated, the welding efficiency is improved, and the welding cost is lowered.
Description
Technical field
The invention belongs to pipeline Lincoln weld technical field, the two-sided submerged arc of a kind of pipe line steel of special design exempts from back chipping welding procedure.
Background technology
Pipe line steel is a kind of low-alloy high-strength steel, be mainly used in and manufacture oil, the conveyance conduit of natural gas and the hot-rolled coil of container or Wide and Thick Slab, especially the material that pipe-line is the most frequently used, it has the combination properties such as high strength, high tenacity and good weldability, has a wide range of applications especially in sea-bottom oil-gas conveyance conduit field.
Submerged arc welding technique is a kind of solder technology efficiently, is frequently used in the automatic welding of pipeline, during conventional welding, gas shielded arc welding bottoming and submerged arc usually need be adopted to fill capping, but this complex operation, and welding efficiency is low, cannot arrive desirable effect.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, the two-sided submerged arc of a kind of pipe line steel is provided to exempt from back chipping welding procedure, can connect in a welding at pipe line steel two and obtain higher welding quality simultaneously, simplify operation, protect weldering or manual bottoming without the need to back of the body guarantor and gas, exempt from back chipping, the weld defect that backing welding and back chipping cause can be eliminated simultaneously, improve welding efficiency, reduce welding cost.
In order to solve above technical problem, the invention provides the two-sided submerged arc of a kind of pipe line steel and exempting from back chipping welding procedure, comprising the steps:
adopt that pipe fitting to be welded cuts off by machining process, groove, and to eliminating rust near pipe bevel, oil removing and scrubbing;
choose the wlding mated with mother metal, comprise drying, solder flux without oil, rustless pipe line steel special welding wire and correspondence, before welding, solder flux is incubated 2-4 hour at 300-350 DEG C;
weld preheating, welds after reaching preheat temperature, and controls interlayer temperature;
Adopt the 5G process of pipe rotating welding head invariant position, first weld outer groove, rear weldering internal groove, the back side is back chipping not, and outer groove adopts multi-pass welding, internal groove one cosmetic welding;
Use internal clamp group to assembling when outer groove root bead connects, ensure that the back side penetrates zero defect;
in welding process, by the adjustment such as Butt welding gun position, welding parameter and control, realize pipe line steel two and connect a girth welding;
postwelding is through weld appearance detection, X-ray detection, ultrasound examination, ultrasound examination, hot strength and impact ductility test.
The technical scheme that the present invention limits further is:
Further, the two-sided submerged arc of aforesaid pipe line steel exempts from back chipping welding procedure, pipe line steel submerged-arc welding bevel design is double V-shaped asymmetric groove, the value of bevel angle α is 60 ± 5 °, the value of bevel angle β is 75 ± 5 °, the length of root face b is 3 ± 1mm, gapless, internal groove degree of depth h ' ' is 3 ± 0.5mm; Need in retaining wall on slope process to correct pipe circularity, ensure unfitness of butt joint c≤1.5mm.
The two-sided submerged arc of aforesaid pipe line steel exempts from back chipping welding procedure, and weld preheating temperature control system at≤80 DEG C, and controls interlayer temperature≤250 DEG C in welding process, and heat input is at≤24KJ/cm, and can effectively avoid weld crack to produce, during welding, connection be straight polarity direct current.
The two-sided submerged arc of aforesaid pipe line steel exempts from back chipping welding procedure, and when pipe line steel two connects a girth welding, without the need to back-protective during collar extension submerged arc root bead, technological parameter is welding current 400-450A, arc voltage 26-28V, speed of welding 550-600mm/min; Fill out/cover process parameter is welding current 500-550A, arc voltage 28-30V, speed of welding 450-550mm/min; During internal orifice welding, ensure the inner through welding of weld seam, technological parameter is welding current 550-600A, arc voltage 30-32V, speed of welding 450-500mm/min, and heat input control system is at≤24KJ/cm.
The two-sided submerged arc of aforesaid pipe line steel exempts from back chipping welding procedure, through weld appearance detection, X-ray detection, ultrasound examination, hot strength and impact ductility test, confirmation appearance of weld is good, face of weld without significantly not merging, macroscopical weld defect such as lack of penetration, undercut, weld strength reaches 90% of strength of parent, the microcosmic weld defects such as inner pore-free, slag inclusion, crackle.
The beneficial effect of the present invention's compared with prior art tool is:
the present invention adopts Lincoln weld to weld pipe line steel, utilize the asymmetric groove of the two-sided V-type of design, internal orifice is welded after first welding collar extension, exempt from back chipping, protect process without the back of the body, collar extension multi-pass welding, internal orifice one cosmetic welding, quality of weld seam molding is good, weld seam and mother metal rounding off, surperficial flawless, pore, slag inclusion, the defect such as lack of penetration;
technical scheme involved in the present invention, particularly at Guan Jing≤610mm, the pipe line steel two of thick degree≤16mm scope connects in a girth welding, can realize saving bottoming and back chipping operation, direct employing submerged-arc welding realizes whole welding process, simplify operation, improve welding efficiency, ensure welding quality, solve pipe line steel welding job amount large, quality control requirement is high, and welding efficiency is low, a high in cost of production difficult problem.
Accompanying drawing explanation
Fig. 1 is double V-shaped asymmetric groove type figure in the present invention;
Fig. 2 is weld passes hierarchy chart in the present invention;
Welding torch position figure when Fig. 3 is collar extension welding employing downward welding in the inclined position in the present invention;
Fig. 4 is welding torch position figure when internal orifice welding adopts climbing to weld in the present invention;
Accompanying drawing remarks:
In Fig. 1, α, β are bevel angle, and t is pipe fitting thickness, and h ' is outer groove depth, and h ' ' is the internal groove degree of depth, and b is root face height; In Fig. 3, Fig. 4, the direction of arrow represents the direction of rotation of pipe.
Detailed description of the invention
In order to deepen the understanding of the present invention, below in conjunction with accompanying drawing, specific embodiments of the invention are further described in detail:
The two-sided submerged arc of a kind of pipe line steel that the present embodiment provides exempts from back chipping welding procedure, comprises the steps:
adopt that pipe fitting to be welded cuts off by machining process, groove, and to eliminating rust near pipe bevel, oil removing and scrubbing;
choose the wlding mated with mother metal, comprise drying, solder flux without oil, rustless pipe line steel special welding wire and correspondence, before welding, solder flux is incubated 2-4 hour at 300-350 DEG C;
weld preheating, welds after reaching preheat temperature, and controls interlayer temperature;
Adopt the 5G process of pipe rotating welding head invariant position, first weld outer groove, rear weldering internal groove, the back side is back chipping not, and outer groove adopts multi-pass welding, internal groove one cosmetic welding;
Use internal clamp group to assembling when outer groove root bead connects, ensure that the back side penetrates zero defect;
in welding process, by the adjustment such as Butt welding gun position, welding parameter and control, realize pipe line steel two and connect a girth welding;
postwelding is through weld appearance detection, X-ray detection, ultrasound examination, ultrasound examination, hot strength and impact ductility test.
In practical operation, its welding method is as follows:
1. welding equipment and material
(1) welding equipment selects me to take charge of interior Welding machine of circumferential weld and 830 positioners are used in conjunction;
(2) welding material mother metal is pipe line steel X65(low-alloy steel), specification is Φ 813 × 22.2mm, yield strength >448Mpa, tensile strength >530Mpa; Adopt Φ 3.2 pipe line steel submerged arc special welding wire TSW-E40, and the solder flux TF-210 matched with it, be incubated 3 hours at welding first 350 DEG C and dry;
2. welds prepares
(1) retaining wall on slope: adopt lathe process to open double V-shaped asymmetric groove to X65 pipe line steel, internal groove 75 ° ± 5 °, outer groove 60 ° ± 5 °, root face 3mm ± 1mm, the internal groove degree of depth is 3mm, gapless, and retaining wall on slope process need corrects pipe circularity, ensure unfitness of butt joint≤1.5mm, as shown in Figure 1;
(2) clear up: the polishing of the electric angle grinder of the dirt such as iron rust, greasy dirt within the scope of pipe bevel edge 20-30mm is clean;
(3) Butt Assembling: in view of adopting internal clamp group to assembling in actual welding, so pipe fitting adopts internal orifice gantry card bridging type to carry out assembling and positioning during test, employs tube supports and guarantees pipe circularity and assembling precision in process;
(4) preheating: before pipe line steel docking, adopt flame preheat, temperature Kong ≤80 DEG C;
3. welding process
(1) welding position: 5G position, pipe rotates, and welding gun is motionless;
(2) welding torch position: in order to ensure that weld seam penetrates zero defect, need before weldering adjust welding torch position, during outer groove welding adjust welding gun be 11 thirty position, pipe fitting turns clockwise, adopt downward welding in the inclined position, molten iron flows backwards a little, as shown in Figure 2; Welding torch position 6 half positions during internal groove welding, pipe fitting is rotated counterclockwise, and adopts climbing weldering, as shown in Figure 3;
(3) by adjusting welding position, welding parameter, interlayer temperature etc. and controlling, internal orifice is welded after first welding collar extension, outer groove adopts multi-pass welding, internal groove one cosmetic welding, control interlayer temperature≤250 DEG C, heat input ≤24KJ/cm, welding process needs interlayer management, removes the slag between welding bead; Welding condition is as table 1, and pass sequence as shown in Figure 4;
table 1: welding parameter
4. inspection after welding: through weld appearance detection, X-ray detection, ultrasound examination, hot strength and impact ductility test, detection and result of the test are, appearance of weld is good, face of weld without significantly not merging, macroscopical weld defect such as lack of penetration, undercut, weld strength can reach 90% of strength of parent, the microcosmic weld defects such as inner pore-free, slag inclusion, crackle.
Back chipping process is exempted from by double groove submerged arc in the present embodiment, obtain on the basis of more high welding quality, realize connecing in a girth welding at pipe line steel two exempting bottoming operation, welding efficiency promotes more than 50% simultaneously, welding cost reduces by 30%, and welding first-time qualification rate reaches 99%; Taken charge of by me and accept CNPC's group's " auxiliary pipe ship pipeline two connects a prefabricated efficient welding automatic soldering technique " soldering test project, have passed group of CNPC and CCS expert on-site verification.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (5)
1. the two-sided submerged arc of pipe line steel exempts from a back chipping welding procedure, it is characterized in that, comprises the steps:
adopt that pipe fitting to be welded cuts off by machining process, groove, and to eliminating rust near pipe bevel, oil removing and scrubbing;
choose the wlding mated with mother metal, comprise drying, solder flux without oil, rustless pipe line steel special welding wire and correspondence, before welding, solder flux is incubated 2-4 hour at 300-350 DEG C;
weld preheating, welds after reaching preheat temperature, and controls interlayer temperature;
Keep pipe rotary welding machine head invariant position, first weld outer groove, rear weldering internal groove, the back side is back chipping not, and outer groove adopts multi-pass welding, internal groove one cosmetic welding;
Use internal clamp group to assembling when outer groove root bead connects, ensure that the back side penetrates zero defect;
in welding process, by the adjustment such as Butt welding gun position, welding parameter and control, realize pipe line steel two and connect a girth welding;
postwelding is through weld appearance detection, X-ray detection, ultrasound examination, ultrasound examination, hot strength and impact ductility test.
2. the two-sided submerged arc of pipe line steel according to claim 1 exempts from back chipping welding procedure, it is characterized in that: pipe line steel submerged-arc welding bevel design is double V-shaped asymmetric groove, the value of bevel angle α is 60 ± 5 °, the value of bevel angle β is 75 ± 5 °, the length of root face b is 3 ± 1mm, gapless, internal groove degree of depth h ' ' is 3 ± 0.5mm; Need in retaining wall on slope process to correct pipe circularity, ensure unfitness of butt joint c≤1.5mm.
3. the two-sided submerged arc of pipe line steel according to claim 1 exempts from back chipping welding procedure, it is characterized in that: weld preheating temperature Kong ≤80 DEG C, and controlling interlayer temperature≤250 DEG C in welding process, heat input is at≤24KJ/cm, and during welding, connection is straight polarity direct current.
4. the two-sided submerged arc of pipe line steel according to claim 1 exempts from back chipping welding procedure, it is characterized in that: when pipe line steel two connects a girth welding, without the need to back-protective during collar extension submerged arc root bead, technological parameter is welding current 400-450A, arc voltage 26-28V, speed of welding 550-600mm/min; Fill out/cover process parameter is welding current 500-550A, arc voltage 28-30V, speed of welding 450-550mm/min; During internal orifice welding, ensure the inner through welding of weld seam, technological parameter is welding current 550-600A, arc voltage 30-32V, speed of welding 450-500mm/min, and heat input control system is at≤24KJ/cm.
5. the two-sided submerged arc of pipe line steel according to claim 1 exempts from back chipping welding procedure, it is characterized in that: through weld appearance detection, X-ray detection, ultrasound examination, hot strength and impact ductility test, confirmation appearance of weld is good, face of weld without significantly not merging, macroscopical weld defect such as lack of penetration, undercut, weld strength reaches 90% of strength of parent, the microcosmic weld defects such as inner pore-free, slag inclusion, crackle.
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| CN201510700666.2A CN105195872A (en) | 2015-10-26 | 2015-10-26 | Double-sided submerged arc back-chipping-free welding technology for pipeline steel |
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| CN201510700666.2A CN105195872A (en) | 2015-10-26 | 2015-10-26 | Double-sided submerged arc back-chipping-free welding technology for pipeline steel |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106378518A (en) * | 2016-11-30 | 2017-02-08 | 东方电气集团东方锅炉股份有限公司 | TIG welding method used for large-diameter thin-wall stainless steel cylinder workpiece circular seam |
| CN106695067A (en) * | 2016-12-31 | 2017-05-24 | 山东胜利钢管有限公司 | Prewelding and finish welding technology of high-steel-grade oil-gas conveying pipeline |
| CN106989216A (en) * | 2016-01-20 | 2017-07-28 | 浙江三花智能控制股份有限公司 | The processing method of pipe fitting body, pipe fitting and pipe fitting |
| CN107538104A (en) * | 2016-06-24 | 2018-01-05 | 中国华冶科工集团有限公司 | Steel plate adds that plate-steel liner is thin, the thick two-sided welding method of welding wire |
| CN107999937A (en) * | 2017-12-22 | 2018-05-08 | 中国石油化工股份有限公司天然气分公司 | A kind of long distance pipeline full-automatic welding process |
| CN108714731A (en) * | 2018-05-29 | 2018-10-30 | 杭州杭氧股份有限公司 | A kind of unclear method for root of submerged-arc welding cut deal |
| CN109623092A (en) * | 2018-12-29 | 2019-04-16 | 张家港市江南锅炉压力容器有限公司 | A kind of welding method for boiler drum cylinder |
| CN110695500A (en) * | 2019-09-25 | 2020-01-17 | 西安理工大学 | Preparation method of X80 pipeline steel welded joint with excellent low-temperature performance |
| CN111545867A (en) * | 2020-05-15 | 2020-08-18 | 徐州徐工液压件有限公司 | Method for carrying out copper surfacing in narrow space |
| CN111940875A (en) * | 2020-08-21 | 2020-11-17 | 陕西金鑫电器有限公司 | Butt girth welding method for large aluminum alloy tank based on riveting virtual point method process |
| CN113070549A (en) * | 2021-04-07 | 2021-07-06 | 南京奥特自动化有限公司 | Pipeline steel two-to-one butt weld pipeline deep melting high-speed welding process method |
| CN114289922A (en) * | 2021-12-31 | 2022-04-08 | 北京博清科技有限公司 | Welding control method, control device, processor and welding system |
| CN114589379A (en) * | 2022-04-18 | 2022-06-07 | 山东蓬翔汽车有限公司 | Axle body longitudinal weld root gap local out-of-tolerance welding method |
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| CN106989216A (en) * | 2016-01-20 | 2017-07-28 | 浙江三花智能控制股份有限公司 | The processing method of pipe fitting body, pipe fitting and pipe fitting |
| CN107538104A (en) * | 2016-06-24 | 2018-01-05 | 中国华冶科工集团有限公司 | Steel plate adds that plate-steel liner is thin, the thick two-sided welding method of welding wire |
| CN106378518A (en) * | 2016-11-30 | 2017-02-08 | 东方电气集团东方锅炉股份有限公司 | TIG welding method used for large-diameter thin-wall stainless steel cylinder workpiece circular seam |
| CN106695067A (en) * | 2016-12-31 | 2017-05-24 | 山东胜利钢管有限公司 | Prewelding and finish welding technology of high-steel-grade oil-gas conveying pipeline |
| CN106695067B (en) * | 2016-12-31 | 2019-04-30 | 山东胜利钢管有限公司 | The pre- astute and able welding procedure of Hi-grade steel oil gas pipeline |
| CN107999937A (en) * | 2017-12-22 | 2018-05-08 | 中国石油化工股份有限公司天然气分公司 | A kind of long distance pipeline full-automatic welding process |
| CN108714731A (en) * | 2018-05-29 | 2018-10-30 | 杭州杭氧股份有限公司 | A kind of unclear method for root of submerged-arc welding cut deal |
| CN109623092A (en) * | 2018-12-29 | 2019-04-16 | 张家港市江南锅炉压力容器有限公司 | A kind of welding method for boiler drum cylinder |
| CN110695500A (en) * | 2019-09-25 | 2020-01-17 | 西安理工大学 | Preparation method of X80 pipeline steel welded joint with excellent low-temperature performance |
| CN111545867A (en) * | 2020-05-15 | 2020-08-18 | 徐州徐工液压件有限公司 | Method for carrying out copper surfacing in narrow space |
| CN111940875A (en) * | 2020-08-21 | 2020-11-17 | 陕西金鑫电器有限公司 | Butt girth welding method for large aluminum alloy tank based on riveting virtual point method process |
| CN113070549A (en) * | 2021-04-07 | 2021-07-06 | 南京奥特自动化有限公司 | Pipeline steel two-to-one butt weld pipeline deep melting high-speed welding process method |
| CN114289922A (en) * | 2021-12-31 | 2022-04-08 | 北京博清科技有限公司 | Welding control method, control device, processor and welding system |
| CN114289922B (en) * | 2021-12-31 | 2024-04-09 | 北京博清科技有限公司 | Welding control method, control device, processor and welding system |
| CN114589379A (en) * | 2022-04-18 | 2022-06-07 | 山东蓬翔汽车有限公司 | Axle body longitudinal weld root gap local out-of-tolerance welding method |
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