CN109570708B - Compound welding method for orthotropic steel bridge deck U rib K-shaped joint - Google Patents
Compound welding method for orthotropic steel bridge deck U rib K-shaped joint Download PDFInfo
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- CN109570708B CN109570708B CN201811356622.2A CN201811356622A CN109570708B CN 109570708 B CN109570708 B CN 109570708B CN 201811356622 A CN201811356622 A CN 201811356622A CN 109570708 B CN109570708 B CN 109570708B
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- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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- 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
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- 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
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Abstract
The invention discloses a composite welding method for K-shaped joints of U ribs of orthotropic steel bridge deck, which comprises the following steps: processing a groove of the U rib: processing two long-side grooves of the U rib to enable the U rib to be provided with an inner groove and an outer groove, and profiling after the grooves are processed; assembling and positioning the U-shaped ribs on the bridge deck slab, and reserving assembling gaps between the U-shaped ribs and the deck slab; the inner side groove of the U rib adopts gas shielded welding; placing the orthotropic plate on an anti-deformation jig frame, starting a pressing device to clamp and fix the bridge deck and perform anti-deformation arching, and turning the anti-deformation jig frame after pressing; the groove on the outer side of the U rib adopts submerged arc automatic welding; and turning over the reversible deformation jig frame to complete the welding of the outer groove weld of the other side edge of the U rib. The invention has the advantages of simple groove processing, no need of back chipping, 100% full penetration of the weld joint between the U rib and the panel, beautiful welding forming, reliable weld joint performance, stable weld joint quality, small welding deformation, high production efficiency and the like.
Description
Technical Field
The invention relates to the field of bridge manufacturing, in particular to a composite welding method for K-shaped joints of U ribs of an orthotropic steel bridge deck in the field of bridge manufacturing.
Background
With the wide application of orthotropic steel bridge decks, the fatigue problem of large-span and heavy-duty steel bridges in the operation process is of great concern in the industry. The key point of research and development at present is the fatigue problem of orthotropic steel bridge deck panels, and aiming at the problem, one of the adopted methods is as follows: the weld joints of the U ribs and the steel bridge deck adopt a full penetration design, so that the fatigue service life of the orthotropic steel bridge deck is prolonged.
The orthotropic plate of the steel bridge is designed and used by a plurality of designs due to the characteristics of high specific rigidity, light weight, convenient and quick manufacturing and installation and the like, and the U rib welding line of the orthotropic plate of the steel bridge is prolonged by dozens of kilometers to hundreds of kilometers, so that in the actual use process, how to obtain the excellent U rib welding line and simultaneously reduce the welding deformation and the shape-righting workload of the orthotropic plate, improve the production and manufacturing efficiency and reduce the consumption of welding materials becomes a new problem, and the problem is continuously solved.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a full penetration welding method for a U-shaped rib plate of a steel bridge, which solves the problem that the U-shaped rib can not realize full penetration welding at present.
The technical scheme is as follows: the invention relates to a composite welding method for K-shaped joints of U ribs of an orthotropic steel bridge deck, which comprises the following steps of: (1) processing a groove of the U rib: processing two long-side grooves of the U rib to enable the U rib to be provided with an inner groove and an outer groove, and profiling after the grooves are processed; (2) assembling and positioning the U-shaped ribs on the bridge deck slab, and reserving assembling gaps between the U-shaped ribs and the deck slab; (3) welding an inner groove weld joint of the U rib by adopting gas shielded welding; (4) placing the orthotropic plate on an anti-deformation jig frame, starting a pressing device to clamp the bridge deck plate, arching the middle of an anti-deformation plate unit for 88-92mm, and turning the anti-deformation jig frame after pressing; (5) the groove on the outer side of the U rib adopts submerged arc automatic welding to complete the welding of the weld joint of the groove on the outer side; (6) and turning over the reversible deformation jig frame to complete the welding of the outer groove weld of the other side edge of the U rib.
In the step (1) of the invention, a blunt edge parallel to the upper surface of the bridge deck is arranged between the inner groove and the outer groove.
Further, the middle point of the blunt edge is offset from the middle point of the side edge of the U rib, near the outer side edge of the U rib.
And (2) in the step (1), the inner groove angle of the U rib is larger than the outer groove angle, and the welding operation is convenient as long as the space is smaller when the U rib is operated inside and the inner groove angle of the U rib is larger.
In order to ensure that the welding wire of the special welding machine for the inner side can be aligned to the root of the welding seam, provide 0.5-1mm welding penetration and ensure good appearance forming of the welding seam after single welding of the outer side, the angle of the inner side groove is 60-64 degrees; the outer bevel is 43-47 degrees.
In the step (2), the assembling clearance is not more than 1mm, and further, the assembling clearance is not more than 0.5 mm.
In order to ensure the quality of the welding seam, the length of the truncated edge is 1-2mm, and the truncated edge is in the range, so that the inner side can be prevented from being welded through during welding.
In the step (3), the welding material of the gas shielded welding is solid welding wire
The gas is argon-rich gas, and the welding speed is 300-340 mm/min.
In the step (5), the submerged arc automatic welding adopts submerged arc welding wires as welding materials
The flux was SJ101q, and the welding speed v was 450-.
Has the advantages that: (1) the invention designs the double-sided welding groove, reduces larger welding deformation caused by larger welding quantity of the outer welding of the U rib, realizes the full penetration welding of the U rib plate unit without back chipping, and can realize the repair of the root defect; (2) the invention adopts a welding method combining gas shielded welding inner welding and submerged arc welding outer welding to realize the full penetration welding of the U rib; (3) the inner groove weld seam and the outer groove weld seam are formed in one step, the welding process is stable, the appearance of the weld seam is attractive in forming, and the operation is simple and easy to realize; (4) the submerged-arc automatic welding device has the advantages that the welding quantity of the submerged-arc automatic welding at the outer side of the welding seam is relatively small, the reversible deformation jig is adopted during welding, the welding deformation is controllable, and the planeness of the welded unit piece is good.
Drawings
FIG. 1 is a schematic view of a groove structure of a U rib of the present invention;
FIG. 2 is a schematic view of the gas shield welding of the inside of the U-rib of the present invention;
FIG. 3 is a schematic view of the outside submerged arc welding of the U-rib of the present invention;
FIG. 4 is a schematic view of a reversible bed jig of the present invention;
FIG. 5 is a schematic view of the straightness of the U-ribbed plate of the present invention;
FIG. 6 is a schematic view of the groove machining on one side of the U rib plate of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 5-6, a straight edge of a U-rib plate is machined by a straight milling cutter 4 to ensure the straightness of the U-rib plate, then a double-sided groove machining is performed on two long edges of the U-rib plate 1 by a milling cutter 5, the groove of the machined U-rib plate is shown in fig. 1, the groove of the U-rib is divided into an inner groove 11, an outer groove 12 and a blunt edge 13, in this embodiment, when the thickness h of the U-rib is 8mm, in order to ensure that a welding wire of a special welding machine for inner side can be aligned with the root of a welding seam and provide a welding penetration of 0.5-1mm, the depth h1 of the machined inner groove is 2mm, the height d1 is 4mm, and the machining angle of the inner groove is 62 degrees; in order to ensure that the weld joint is well formed after the outer side single-pass welding, and simultaneously, 8mmU ribs can be completely melted through, the depth h2 of the processed outer groove is 5mm, the height d2 of the processed outer groove is 5mm, the angle of the processed outer groove is 45 degrees, the size p of the truncated edge of the processed outer groove is 1mm, and the inner groove and the outer groove are processed and then are pressed; and then, assembling and positioning the U-shaped rib on the bridge deck by adopting U-shaped rib automatic assembling equipment, wherein the assembling clearance is controlled within 0.5mm, and the partial assembling clearance is allowed to be 1.0 mm.
As shown in figure 2, the welding of the inside groove weld is completed by adopting U-shaped internal welding equipment, the specific welding method is gas shielded welding, and the welding material is solid welding wire
Argon-rich gas is adopted, and the composition of the gas is argon (Ar) and carbon dioxide (CO) in a volume ratio of 4:12) And welding parameters are as follows: i is 300A, U is 34V, the welding speed V is 300-.
As shown in fig. 3, transversely moving and adjusting the anti-deformation plate on the anti-deformation jig frame 3 according to the width of the bridge deck plate 2, placing the orthotropic plate on the ship position anti-deformation jig frame 3, starting a pressing device to clamp the bridge deck plate 2, arching the middle of an anti-deformation plate unit by 90 +/-2 mm, turning the anti-deformation jig frame 3 by 35 degrees after pressing, welding a groove welding seam at the outer side of a U rib by adopting a submerged arc automatic welding device, wherein the welding material is a submerged arc welding wire
Matching flux SJ101 q; and welding parameters are as follows: i is 580A, U is 30V, the welding speed V is 450-; and (3) overturning the reversible deformation jig frame 3, wherein the overturning angle is 70 degrees, and welding a groove welding seam on the other side of the U rib by adopting submerged arc automatic welding equipment.
As shown in fig. 4, the reverse deformation jig 3 used in the present invention mainly includes a reverse deformation plate slot 31, a reverse deformation plate 32, a turnover device 33, a pressing device 34, and a jig 35, and the device can fix the U rib, change the angle of the U rib, and improve the welding efficiency.
The U rib of the orthotropic plate is provided with the double-sided groove, the U rib forming equipment is processed at one time, the K-shaped groove is simple to process, the welding method combining inner welding and outer welding is adopted, the inner side is welded by gas shielded welding, the outer side does not need to be back-rooted and adopts a welding method combining submerged arc welding, the welding seam of the U rib and the steel bridge panel can reach 100% full penetration welding, and the orthotropic plate has the advantages of stable welding quality, attractive welding seam forming, reliable welding seam performance, small welding deformation, high production efficiency and the like.
Claims (3)
1. A composite welding method for K-shaped joints of U ribs of orthotropic steel bridge deck is characterized by comprising the following steps:
(1) processing a groove of the U rib: when the thickness h of the U rib is 8mm, processing two long-side grooves of the U rib to form an inner groove and an outer groove, and profiling after the grooves are processed; a truncated edge parallel to the upper surface of the bridge deck is arranged between the inner groove and the outer groove; the length of the truncated edge is 1 mm; the depth of the processed inner groove is 2mm, the height of the processed inner groove is 4mm, and the processing angle of the inner groove is 62 degrees; the depth of the processed outer groove is 5mm, the height of the processed outer groove is 5mm, and the processing angle of the outer groove is 45 degrees;
(2) assembling and positioning the U-shaped ribs on the bridge deck slab, and reserving assembling gaps between the U-shaped ribs and the deck slab;
(3) welding an inner groove weld joint of the U rib by adopting gas shielded welding; the welding material is a solid welding wire ER70S-6 phi 1.2mm, argon-rich gas is adopted, the gas comprises argon and carbon dioxide with the volume ratio of 4:1, and the welding parameters are as follows: i is 300A, U is 34V, the welding speed V is 300-;
(4) placing the orthotropic plate on an anti-deformation jig frame, starting a pressing device to clamp the bridge deck plate and arch the middle of an anti-deformation plate unit by 88-92mm, and turning the anti-deformation jig frame by 35 degrees after pressing;
(5) the groove on the outer side of the U rib adopts submerged arc automatic welding to complete the welding of the weld joint of the groove on the outer side; the welding material is a submerged arc welding wire H10Mn2 phi 4.0mm, and is matched with a welding flux SJ101 q; welding parameters are as follows: i is 580A, U is 30V, the welding speed V is 450-;
(6) and (4) overturning the reversible deformation jig frame, wherein the overturning angle is 70 degrees, and welding of the outer groove weld of the other side edge of the U rib is completed.
2. The method for composite welding of K-joints of orthotropic steel bridge deck U ribs according to claim 1, wherein the midpoint of said blunt edge is offset from the midpoint of the sides of the U rib, near the outer sides of the U rib.
3. The method for the hybrid welding of K-shaped joints of U ribs on orthotropic steel bridge decks according to claim 1, wherein in the step (2), the assembly gap is not more than 1 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811356622.2A CN109570708B (en) | 2018-11-15 | 2018-11-15 | Compound welding method for orthotropic steel bridge deck U rib K-shaped joint |
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| CN201811356622.2A CN109570708B (en) | 2018-11-15 | 2018-11-15 | Compound welding method for orthotropic steel bridge deck U rib K-shaped joint |
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| CN109570708A CN109570708A (en) | 2019-04-05 |
| CN109570708B true CN109570708B (en) | 2021-07-30 |
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| CN111531245A (en) * | 2020-06-12 | 2020-08-14 | 山西潇河建筑产业有限公司 | Positioning platform for assembling bridge U rib and plate rib |
| CN112045284A (en) * | 2020-06-23 | 2020-12-08 | 中铁宝桥集团有限公司 | Full-penetration internal and external synchronous submerged arc welding method for U rib plate unit |
| CN115430887A (en) * | 2021-06-04 | 2022-12-06 | 南通振华重型装备制造有限公司 | Full penetration welding method for 16mmU rib with hot-rolled variable cross section of extra-large bridge |
| CN117182369B (en) * | 2023-07-18 | 2024-06-18 | 中建五洲工程装备有限公司 | Welding and annealing deformation control method for steel bridge deck unit |
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| CN102275026A (en) * | 2010-06-08 | 2011-12-14 | 上海振华重工(集团)股份有限公司 | Welding process for U-shaped rib of steel bridge panel |
| CN205998094U (en) * | 2016-08-09 | 2017-03-08 | 中交第二公路勘察设计研究院有限公司 | A kind of two-sided welding structure of U rib of putting more energy into of orthotropic stiffener |
| CN106180983A (en) * | 2016-08-19 | 2016-12-07 | 高兴 | A kind of welding method of U rib |
| CN106270956A (en) * | 2016-09-09 | 2017-01-04 | 中铁宝桥（扬州）有限公司 | A kind of orthotropic plate U angle of rib weld seam transverse presentation symmetry mariages complex welding method |
| CN106312247A (en) * | 2016-10-19 | 2017-01-11 | 武船重型工程股份有限公司 | Bilateral welding method for fillet seams of U rib and orthotropic steel deck plate |
| CN107598330B (en) * | 2017-10-26 | 2020-05-01 | 上海振华重工(集团)股份有限公司 | Full penetration welding method for U-shaped rib |
| CN108436320A (en) * | 2018-05-28 | 2018-08-24 | 湖北天图桥梁技术研究有限公司 | A kind of U ribs and orthotropic plate unit and its welding manufacture method |
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