CN110756964A - Reverse deformation treatment process before welding of H-shaped steel structure - Google Patents
Reverse deformation treatment process before welding of H-shaped steel structure Download PDFInfo
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- CN110756964A CN110756964A CN201911230056.5A CN201911230056A CN110756964A CN 110756964 A CN110756964 A CN 110756964A CN 201911230056 A CN201911230056 A CN 201911230056A CN 110756964 A CN110756964 A CN 110756964A
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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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- 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
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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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Abstract
The invention provides a reverse deformation treatment process before welding of an H-shaped steel structure, which comprises the following steps of: (1) before blanking processing, straightening and correcting the lower flange plate, the upper flange plate and the web plate, and scribing; cutting; then the lower flange plate, the upper flange plate and the web plate are placed in water at the temperature of 1-4 ℃ to be soaked for 10-15h, and then placed in the environment at the temperature of 85-95 ℃ for 20-40 h; the parts to be welded of the lower flange plate and the upper flange plate are locally heated; (2) assembling and assembling; gap cushion plates with the thickness of 2.5-3mm are arranged at the connecting positions of the flange plates and the web plates, and the distance between the gap cushion plates is 200-350 mm; (3) and (2) performing back sealing welding by adopting mixed gas shielded welding, wherein the mixed gas is argon and carbon dioxide in a volume ratio of 6-10: 1, preparing a composition; and then submerged arc welding is carried out. The method has the advantages of simple process and good treatment effect, and the obtained H-shaped steel structure has stable quality and is not easy to generate local deformation.
Description
Technical Field
The invention relates to the technical field of H-shaped steel structure treatment, in particular to a reverse deformation treatment process before welding of an H-shaped steel structure.
Background
The H-shaped steel structure, namely the wide flange I-steel, is a steel structure which is increasingly widely used in modern building structures, bridge structures and power station construction, and has the characteristics of attractive and economic structure, good section mechanical property, good stability and the like. Compared with the common I-steel, the H-shaped steel structure has the advantages of large section modulus, light weight and metal saving. Because the prior domestic rolling technology is immature, the thick plate H-shaped steel is mostly manufactured by welding. Therefore, the control of welding deformation becomes an important control link in the manufacturing process, and once the welding deformation occurs, the workload and the production cost are increased, and meanwhile, a series of problems such as component installation and use are caused. If the correction is performed, certain labor, materials and time are consumed for correction, and if the correction is performed, the components are forbidden to be used and discarded.
The deformation of the welded steel structure can be roughly divided into two cases: i.e. deformations of the whole structure and deformations of parts of the structure. Deformation of the overall structure includes longitudinal and lateral shortening and bending (i.e., buckling) of the structure. The local deformation is represented by convex bending, wave shape, angular deformation and the like. The following basic welding deformation forms are common: the plate groove is deformed by length shortening (longitudinal shrinkage) and width narrowing (transverse shrinkage) after butt welding; angular deformation is generated after the groove of the plate is in butt joint welding; the angular deformation of the welded component is different in numerical value along the longitudinal axis direction of the component and is distorted and deformed due to the fact that the flanges and the web plate of the component are not longitudinally contracted; after the thin plate is welded, the pressed stress area of the mother material generates wave deformation formed by warping of the plate surface due to instability; this deformation is a bending deformation because the longitudinal and transverse contraction of the weld causes an overall bending of the member that is asymmetric with respect to the neutral axis of the member.
The deformation treatment of the H-shaped steel welding at present is still a difficult point of process control, and various deformation forms still often occur, so that correction is necessary. When the correction is performed, the correction is generally performed by using a flange correcting machine, an anti-bending correcting machine, a flame heating method and other process equipment or process methods, and sometimes the correction is performed by using a method combining cold correction and hot correction. However, the prior art has been required to further improve the handling of the problem of deformation in welding of H-section steel.
Disclosure of Invention
The invention aims to provide a reverse deformation treatment process before welding of an H-shaped steel structure, which is simple in process and good in treatment effect, and the obtained H-shaped steel structure is stable in quality and is not easy to deform locally.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a reverse deformation treatment process before welding of an H-shaped steel structure comprises the following steps:
(1) before blanking processing, straightening and correcting the lower flange plate, the upper flange plate and the web plate, and then scribing; automatic cutting is adopted, two sides are symmetrically cut during cutting, the two sides are heated identically, and the deformation is identical; then the lower flange plate, the upper flange plate and the web plate are placed in water at the temperature of 1-4 ℃ to be soaked for 10-15h, and then placed in the environment at the temperature of 85-95 ℃ for 20-40 h; then, locally heating the parts to be welded of the lower flange plate and the upper flange plate, so that the heated cross section arching amount of the lower flange plate and the upper flange plate is controlled within three thousandths;
(2) assembling and assembling the lower flange plate, the upper flange plate and the web plate processed in the step (1); the connecting place of the upper flange plate and the web plate and the connecting place of the lower flange plate and the web plate are both padded with gap cushion plates with the thickness of 2.5-3mm, and the distance between the gap cushion plates is 200-350 mm;
(3) before welding, removing oil stains and dust in the range of 40-60mm around the welding line; adopting mixed gas shielded welding to implement back sealing welding, firstly carrying out mixed gas shielded welding back sealing welding on a lower flange, and then carrying out mixed gas shielded welding back sealing welding on an upper flange, wherein the mixed gas is argon and carbon dioxide according to the volume ratio of 6-10: 1, preparing a composition; and then submerged arc welding is carried out.
Preferably, in the step (1), the lower flange plate, the upper flange plate and the web plate are soaked in water at 1 ℃ for 12 hours and then are placed in an environment at 95 ℃ for 32 hours.
Preferably, in the step (2), the interval between the gap pads is 300 mm.
Preferably, in the step (3), the mixed gas is argon and carbon dioxide in a volume ratio of 8.5: 1.
Preferably, in the step (3), during the back-sealing welding, a welding wire with a diameter of 1.2-1.6mm is selected, the welding current is 300- & ltSUB & gt 350 & gtA, the welding voltage is 30-35V, the welding speed is 320- & ltSUB & gt 360 & ltSUB & gt/min, and the gas flow is 16-22L/min.
Preferably, in the step (3), during submerged arc welding, a welding wire with a diameter of 2.5-3.5mm is selected, the welding current is 400-.
The invention has the beneficial effects that:
before local heating and welding, the lower flange plate, the upper flange plate and the web plate are placed in water at the temperature of 1-4 ℃ for soaking for 2-5H, then placed in an environment at the temperature of 85-95 ℃ for 20-40H, so that residual stress can be effectively removed, the arching amount of parts to be welded of the lower flange plate and the upper flange plate can be easily controlled within a lower range during local heating, and in the welding process, the thickness and the distance of the gap pad plates are reasonably set, and the problem that the obtained H-shaped steel structure is not easy to deform locally is solved through a reasonable welding mode, so that correction is not needed after welding, the working efficiency is improved, and the production cost is reduced. Furthermore, the shielding gas adopted by the back-sealing welding and the submerged-arc welding is proper, and the technological parameters are reasonably set, so that the welding quality is good, and the overall performance of the H-shaped steel structure is improved.
Drawings
FIG. 1 is a schematic structural view of the H-shaped steel structure of the present invention.
In the figure: 1-upper flange plate; 2-lower flange plate; 3-a web plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a reverse deformation treatment process before welding of an H-shaped steel structure comprises the following steps:
(1) before blanking processing, straightening and correcting the lower flange plate 2, the upper flange plate 1 and the web plate 3, and then scribing; automatic cutting is adopted, two sides are symmetrically cut during cutting, the two sides are heated identically, and the deformation is identical; then the lower flange plate 2, the upper flange plate 1 and the web plate 3 are placed in water at the temperature of 1 ℃ for soaking for 12 hours, and then placed in an environment at the temperature of 95 ℃ for 32 hours; and then, locally heating the parts to be welded of the lower flange plate 2 and the upper flange plate 1, so that the heated cross section arching of the lower flange plate 2 and the upper flange plate 1 is controlled within three thousandths.
(2) Assembling and assembling the lower flange plate 2, the upper flange plate 1 and the web plate 3 which are processed in the step (1); the place that will go up flange plate 1 and web 3 and the place that lower flange plate 2 and web 3 are connected all stacks up 3mm thick clearance backing plate, and the interval between the clearance backing plate is between 300 mm.
(3) Before welding, removing oil stains and dust within 60mm of the periphery of the welding line; adopting mixed gas shielded welding to implement back sealing welding, firstly carrying out mixed gas shielded welding back sealing welding on a lower flange, and then carrying out mixed gas shielded welding back sealing welding on an upper flange, wherein the mixed gas is argon and carbon dioxide according to the volume ratio of 8.5: 1, preparing a composition; and then submerged arc welding is carried out.
Wherein, when the back cover welding is carried out, a welding wire with the diameter of 1.5mm is selected, the welding current is 3250A, the welding voltage is 35V, the welding speed is 350mm/min, and the gas flow is 20L/min. When submerged arc welding is carried out, a welding wire with the diameter of 3mm is selected, the welding current is 420A, the welding voltage is 38V, the welding speed is 450mm/min, and the gas flow is 28L/min.
Example 2:
a reverse deformation treatment process before welding of an H-shaped steel structure comprises the following steps:
(1) before blanking processing, straightening and correcting the lower flange plate 2, the upper flange plate 1 and the web plate 3, and then scribing; automatic cutting is adopted, two sides are symmetrically cut during cutting, the two sides are heated identically, and the deformation is identical; then the lower flange plate 2, the upper flange plate 1 and the web plate 3 are placed in water at the temperature of 2 ℃ for soaking for 15 hours, and then placed in an environment at the temperature of 95 ℃ for 20 hours; and then, locally heating the parts to be welded of the lower flange plate 2 and the upper flange plate 1, so that the heated cross section arching of the lower flange plate 2 and the upper flange plate 1 is controlled within three thousandths.
(2) Assembling and assembling the lower flange plate 2, the upper flange plate 1 and the web plate 3 which are processed in the step (1); and gap cushion plates with the thickness of 3mm are arranged at the connecting positions of the upper flange plate 1 and the web plate 3 and the connecting positions of the lower flange plate 2 and the web plate 3, and the distance between the gap cushion plates is 280 mm.
(3) Before welding, removing oil stains and dust within 60mm of the periphery of the welding line; adopting the mixed gas shielded welding to implement back weld, firstly carrying out the mixed gas shielded welding back weld of the lower flange, and then carrying out the mixed gas shielded welding back weld of the upper flange, wherein the mixed gas is argon and carbon dioxide according to the volume ratio of 9: 1, preparing a composition; and then submerged arc welding is carried out.
Wherein, when the back sealing is carried out, a welding wire with the diameter of 1.5mm is selected, the welding current is 350A, the welding voltage is 30V, the welding speed is 350mm/min, and the gas flow is 18L/min. When submerged arc welding is carried out, a welding wire with the diameter of 3.5mm is selected, the welding current is 450A, the welding voltage is 36V, the welding speed is 430mm/min, and the gas flow is 28L/min.
Example 3:
a reverse deformation treatment process before welding of an H-shaped steel structure comprises the following steps:
(1) before blanking processing, straightening and correcting the lower flange plate 2, the upper flange plate 1 and the web plate 3, and then scribing; automatic cutting is adopted, two sides are symmetrically cut during cutting, the two sides are heated identically, and the deformation is identical; then the lower flange plate 2, the upper flange plate 1 and the web plate 3 are placed in water at 4 ℃ for soaking for 10 hours, and then placed in an environment at 95 ℃ for 30 hours; and then, locally heating the parts to be welded of the lower flange plate 2 and the upper flange plate 1, so that the heated cross section arching of the lower flange plate 2 and the upper flange plate 1 is controlled within three thousandths.
(2) Assembling and assembling the lower flange plate 2, the upper flange plate 1 and the web plate 3 which are processed in the step (1); and gap cushion plates with the thickness of 3mm are arranged at the connecting positions of the upper flange plate 1 and the web plate 3 and the connecting positions of the lower flange plate 2 and the web plate 3, and the distance between the gap cushion plates is 350 mm.
(3) Before welding, removing oil stains and dust within a range of 50mm around the welding line; adopting the mixed gas shielded welding to implement back weld, firstly carrying out the mixed gas shielded welding back weld of the lower flange, and then carrying out the mixed gas shielded welding back weld of the upper flange, wherein the mixed gas is argon and carbon dioxide according to the volume ratio of 6: 1, preparing a composition; and then submerged arc welding is carried out.
Wherein, when the back cover welding is carried out, a welding wire with the diameter of 1.2mm is selected, the welding current is 350A, the welding voltage is 32V, the welding speed is 360mm/min, and the gas flow is 22L/min. When submerged arc welding is carried out, a welding wire with the diameter of 3mm is selected, the welding current is 420A, the welding voltage is 38V, the welding speed is 460mm/min, and the gas flow is 30L/min.
Example 4:
a reverse deformation treatment process before welding of an H-shaped steel structure comprises the following steps:
(1) before blanking processing, straightening and correcting the lower flange plate 2, the upper flange plate 1 and the web plate 3, and then scribing; automatic cutting is adopted, two sides are symmetrically cut during cutting, the two sides are heated identically, and the deformation is identical; then the lower flange plate 2, the upper flange plate 1 and the web plate 3 are placed in water at the temperature of 1 ℃ for soaking for 15 hours, and then placed in an environment at the temperature of 85 ℃ for 40 hours; and then, locally heating the parts to be welded of the lower flange plate 2 and the upper flange plate 1, so that the heated cross section arching of the lower flange plate 2 and the upper flange plate 1 is controlled within three thousandths.
(2) Assembling and assembling the lower flange plate 2, the upper flange plate 1 and the web plate 3 which are processed in the step (1); and gap cushion plates with the thickness of 2.5mm are arranged at the connecting position of the upper flange plate 1 and the web plate 3 and the connecting position of the lower flange plate 2 and the web plate 3, and the distance between the gap cushion plates is 200 mm.
(3) Before welding, removing oil stains and dust within 40mm of the periphery of the welding line; adopting the mixed gas shielded welding to implement back weld, firstly carrying out the mixed gas shielded welding back weld of the lower flange, and then carrying out the mixed gas shielded welding back weld of the upper flange, wherein the mixed gas is argon and carbon dioxide according to the volume ratio of 10: 1, preparing a composition; and then submerged arc welding is carried out.
Wherein, when the back cover welding is carried out, a welding wire with the diameter of 1.6mm is selected, the welding current is 300A, the welding voltage is 35V, the welding speed is 320mm/min, and the gas flow is 16L/min. When submerged arc welding is carried out, a welding wire with the diameter of 3.5mm is selected, the welding current is 450A, the welding voltage is 40V, the welding speed is 430mm/min, and the gas flow is 25L/min.
Example 5:
a reverse deformation treatment process before welding of an H-shaped steel structure comprises the following steps:
(1) before blanking processing, straightening and correcting the lower flange plate 2, the upper flange plate 1 and the web plate 3, and then scribing; automatic cutting is adopted, two sides are symmetrically cut during cutting, the two sides are heated identically, and the deformation is identical; then the lower flange plate 2, the upper flange plate 1 and the web plate 3 are placed in water at the temperature of 3 ℃ for soaking for 12 hours, and then placed in an environment at the temperature of 90 ℃ for 20 hours; and then, locally heating the parts to be welded of the lower flange plate 2 and the upper flange plate 1, so that the heated cross section arching of the lower flange plate 2 and the upper flange plate 1 is controlled within three thousandths.
(2) Assembling and assembling the lower flange plate 2, the upper flange plate 1 and the web plate 3 which are processed in the step (1); and gap cushion plates with the thickness of 2.5mm are arranged at the connecting position of the upper flange plate 1 and the web plate 3 and the connecting position of the lower flange plate 2 and the web plate 3, and the distance between the gap cushion plates is 300 mm.
(3) Before welding, removing oil stains and dust within 60mm of the periphery of the welding line; adopting mixed gas shielded welding to implement back sealing welding, firstly carrying out mixed gas shielded welding back sealing welding on a lower flange, and then carrying out mixed gas shielded welding back sealing welding on an upper flange, wherein the mixed gas is argon and carbon dioxide according to the volume ratio of 8.5: 1, preparing a composition; and then submerged arc welding is carried out.
Wherein, when the back sealing is carried out, a welding wire with the diameter of 1.5mm is selected, the welding current is 320A, the welding voltage is 30V, the welding speed is 3560mm/min, and the gas flow is 20L/min. When submerged arc welding is carried out, a welding wire with the diameter of 2.5mm is selected, the welding current is 400A, the welding voltage is 36V, the welding speed is 450mm/min, and the gas flow is 28L/min.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
- The reverse deformation treatment process before welding of the H-shaped steel structure is characterized by comprising the following steps of:(1) before blanking processing, straightening and correcting the lower flange plate, the upper flange plate and the web plate, and then scribing; automatic cutting is adopted, two sides are symmetrically cut during cutting, the two sides are heated identically, and the deformation is identical; then the lower flange plate, the upper flange plate and the web plate are placed in water at the temperature of 1-4 ℃ to be soaked for 10-15h, and then placed in the environment at the temperature of 85-95 ℃ for 20-40 h; then, locally heating the parts to be welded of the lower flange plate and the upper flange plate, so that the heated cross section arching amount of the lower flange plate and the upper flange plate is controlled within three thousandths;(2) assembling and assembling the lower flange plate, the upper flange plate and the web plate processed in the step (1); the connecting place of the upper flange plate and the web plate and the connecting place of the lower flange plate and the web plate are both padded with gap cushion plates with the thickness of 2.5-3mm, and the distance between the gap cushion plates is 200-350 mm;(3) before welding, removing oil stains and dust in the range of 40-60mm around the welding line; adopting mixed gas shielded welding to implement back sealing welding, firstly carrying out mixed gas shielded welding back sealing welding on a lower flange, and then carrying out mixed gas shielded welding back sealing welding on an upper flange, wherein the mixed gas is argon and carbon dioxide according to the volume ratio of 6-10: 1, preparing a composition; and then submerged arc welding is carried out.
- 2. The H-shaped steel structure pre-welding reverse deformation treatment process according to claim 1, wherein in the step (1), the lower flange plate, the upper flange plate and the web plate are soaked in water at 1 ℃ for 12 hours and then are placed in an environment at 95 ℃ for 32 hours.
- 3. The H-shaped steel structure pre-welding reverse deformation treatment process according to claim 1, wherein in the step (2), the distance between the gap backing plates is 300 mm.
- 4. The reverse deformation treatment process before welding of the H-shaped steel structure according to claim 1, wherein in the step (3), the mixed gas is argon and carbon dioxide, and the volume ratio of argon to carbon dioxide is 8.5: 1.
- 5. The H-shaped steel structure pre-welding reverse deformation treatment process as claimed in claim 1, wherein in the step (3), a welding wire with the diameter of 1.2-1.6mm is selected during the bottom sealing welding, the welding current is 300-350A, the welding voltage is 30-35V, the welding speed is 320-360mm/min, and the gas flow is 16-22L/min.
- 6. The H-shaped steel structure pre-welding reverse deformation treatment process as claimed in claim 1, wherein in the step (3), a welding wire with the diameter of 2.5-3.5mm is selected during submerged arc welding, the welding current is 400-450A, the welding voltage is 36-40V, the welding speed is 430-460mm/min, and the gas flow is 25-30L/min.
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Cited By (4)
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| CN111843388A (en) * | 2020-07-23 | 2020-10-30 | 浙江亚磊型钢冷拔有限公司 | H-shaped steel welding treatment process |
| CN114192944A (en) * | 2021-12-28 | 2022-03-18 | 江苏新蓝天钢结构有限公司 | Full penetration back-gouging-free I-shaped steel welding method introducing welding predeformation |
| CN114669955A (en) * | 2022-04-29 | 2022-06-28 | 徐州徐工挖掘机械有限公司 | Method for preventing welding deformation of tube plate structure |
| CN117226370A (en) * | 2023-11-16 | 2023-12-15 | 中铁建工集团有限公司 | Steel structure overpass truss structure, welding device and welding installation method thereof |
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| CN114192944A (en) * | 2021-12-28 | 2022-03-18 | 江苏新蓝天钢结构有限公司 | Full penetration back-gouging-free I-shaped steel welding method introducing welding predeformation |
| CN114192944B (en) * | 2021-12-28 | 2023-09-22 | 江苏新蓝天钢结构有限公司 | Full penetration back-gouging-free I-steel welding method introducing welding pre-deformation |
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| CN114669955B (en) * | 2022-04-29 | 2024-01-23 | 徐州徐工挖掘机械有限公司 | Method for preventing welding deformation of tube plate structure |
| CN117226370A (en) * | 2023-11-16 | 2023-12-15 | 中铁建工集团有限公司 | Steel structure overpass truss structure, welding device and welding installation method thereof |
| CN117226370B (en) * | 2023-11-16 | 2024-03-19 | 中铁建工集团有限公司 | Steel structure overpass truss structure, welding device and welding installation method thereof |
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Application publication date: 20200207 |