CN114101867A - Electrogas welding method for high-strength steel plate for 42-50mm ship body - Google Patents
Electrogas welding method for high-strength steel plate for 42-50mm ship body Download PDFInfo
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- CN114101867A CN114101867A CN202111423983.6A CN202111423983A CN114101867A CN 114101867 A CN114101867 A CN 114101867A CN 202111423983 A CN202111423983 A CN 202111423983A CN 114101867 A CN114101867 A CN 114101867A
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- 238000003466 welding Methods 0.000 title claims abstract description 221
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 41
- 239000010959 steel Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002023 wood Substances 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005498 polishing Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Classifications
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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
-
- 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
- B23K9/32—Accessories
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to the field of ship manufacturing, and discloses an electrogas welding method of a high-strength steel plate for a 42-50mm ship body, which comprises the following steps: arranging a single-side V-shaped groove at the welding position; the back of the welding seam is welded and fixed with a steel plate by adopting a horse plate; installing a gasket on the back of the welding groove, and tightly attaching the gasket to the steel plate by using a wood wedge; installing a welding guide rail and a welding trolley on the front surface of the welding groove and in a direction parallel to the welding groove; adjusting the angle of the welding gun to enable the surface of the welding gun and the workpiece to be welded to be 10-15 degrees, enabling the flow of the protective gas to be 35L/min, the welding current to be 450-470A, the welding voltage to be 40-44V, the welding speed to be 4 +/-1 cm/min, and forming the front side and the back side of the welding line at one time. The invention can meet the electro-gas welding of the high-strength steel plate for the ship body with the thickness of 42-50mm on the premise of not preheating before welding, achieves the aim of outdoor high-efficiency welding construction, shortens the welding period, improves the quality of welding seams and reduces the polishing time after welding.
Description
Technical Field
The invention belongs to the field of ship manufacturing, and particularly relates to an electro-gas welding method for a high-strength steel plate for a 42-50mm ship body.
Background
The electro-gas welding is a high-efficiency welding method with large heat input, and is particularly suitable for outdoor field operation because the welding efficiency is high, a scaffold does not need to be erected during welding, and the electro-gas welding is carried out by adopting an overhead vehicle, and is generally used for vertical butt welding with the plate thickness of less than 35mm (the marine high-strength steel plate generally does not need to be preheated before being welded with the thickness of less than 35mm, and is preheated before being welded with the thickness of more than 35mm, so that the welding efficiency of the electro-gas welding is influenced).
The general assembly of the deck of the bulk carrier is built in a side state PE mode, namely, butt welding seams of the sectional general assembly deck are in a vertical welding mode, the thickness of a deck steel plate is generally 42-50mm, manual CO2 welding is conventionally adopted, preheating before welding is 100 ℃ and 120 ℃, welding efficiency is low, operation difficulty is high, appearance quality of the welding seams is poor, polishing time of the welding seams after welding is long, preheating difficulty before welding is high in vertical high-altitude operation, preheating efficiency is low, and the like, and hands are required to assist. Take a 20.8 ten thousand ton bulk carrier as an example: the length of a vertical butt welding seam of 1 deck is about 13 meters, 2 welders can finish the welding within about 40 hours, and particularly the construction period is longer when the welders are windy and rainy.
In order to avoid preheating the whole welding seam area before welding, shorten the welding period, improve the welding seam quality, reduce the polishing time after welding, replace an on-site scaffold with an overhead vehicle, comprehensively reduce the production cost and have very necessary practical significance for propelling the gas-electric vertical welding to be applied to the vertical welding seam of the general assembly deck of the top side cabin.
Disclosure of Invention
The invention aims to provide a method for electrogas welding of a high-strength steel plate for a ship body with the thickness of 42-50mm, which omits the preheating link before welding when the high-strength steel plate for the ship body is welded by the traditional manual CO2 welding, shortens the welding period, improves the quality of a welding seam, and reduces the polishing time after welding.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for electrogas welding of a high-strength steel plate for a 42-50mm ship body comprises the following specific steps:
(1) arranging a groove at a welding position, wherein the welding groove adopts a single-side V-shaped groove, the angle of the groove is 18-21 degrees, the gap of the welding groove is 9 +/-1 mm, and no truncated edge is left on the welding groove;
(2) assembling a horse plate, and welding and fixing the horse plate and a steel plate on the back of a welding line at a distance of 400 mm;
(3) installing a gasket on the back of the welding groove, wherein the gasket is required to be tightly attached to the steel plate by using a wood wedge when being installed, and the gasket is installed after the extra height of the welding line is ground when a transverse welding line is met, so that welding leakage is prevented;
(4) installing a welding guide rail and a welding trolley on the front surface of the welding groove in a direction parallel to the welding groove, wherein the copper slide block is connected with a circulating water cooling system;
(5) adopting electrogas welding to carry out single-side welding, adjusting the angle of a welding gun to ensure that the surface of the welding gun and a workpiece to be welded is 10-15 degrees, the flow of protective gas is 35L/min, the welding current is 450-470A, the welding voltage is 40-44V, the welding speed is 4 +/-1 cm/min, and the front side and the back side of a welding line are formed at one time;
(6) after welding, the horse board is cut off by gas cutting, the welding part is polished to be flat, and the welding trolley is dismantled.
Preferably, in the step (2), the horse plate and the steel plate are welded and fixed, and the welding mode of flux-cored arc welding is adopted for welding. The flux-cored wire has small electric arc welding spatter, reduces the frequency of welding wire nozzle blocking, avoids the excessive loss of molten steel spatter, ensures that a welding seam is fuller, has good welding performance, adopts gas-slag combined protection, and has attractive welding seam forming, high deposition speed, high production efficiency and higher flux-cored wire melting speed under the same current.
Preferably, in the step (2), a rectangular through hole is formed in the middle of one welded side of the horse plate and the steel plate. The rectangular through hole is matched with the shape of the gasket, so that the gasket is more convenient to mount and fix.
Preferably, the electrogas welding in the step (4) adopts a welding wire with the diameter of 1.6 mm, and the extension length of the welding wire is 36-38 mm.
Preferably, the liner in step (3) is a ceramic liner. By using the ceramic liner, the stability of electric arc during welding is ensured, the welding quality is ensured, and the welding efficiency is improved.
Compared with the prior art, the invention has the following advantages:
the welding method can meet the electro-gas welding of the high-strength steel plate for the ship body with the thickness of 42-50mm on the premise of not preheating before welding, achieves outdoor high-efficiency welding construction, and only heats the flame in the range of 200mm at the arc starting position by 120 ℃ and 120 ℃ before welding, which is different from the preheating of the whole welding line by 100 ℃ and 120 ℃ before manual CO2 welding, greatly saves the electric energy source, shortens the welding period, improves the welding line quality, reduces the polishing time after welding, replaces a field scaffold with an overhead vehicle, and comprehensively reduces the production cost.
Drawings
FIG. 1 is a schematic view of the structure of the weld of the present invention;
FIG. 2 is a schematic diagram of the groove of the present invention;
FIG. 3 is a schematic view of an assembly structure of the horse board, the liner and the steel board;
wherein, 1-steel plate, 101 groove gap, 2-horse plate, 3-gasket, 301-wood wedge, 4-welding gun, 5-welding wire, 6-CO2 gas hood, 7-copper slide block, 701-circulating water inlet, 702-circulating water outlet and 8-welding seam
Detailed Description
The following detailed description of the present invention will be further illustrated with reference to the accompanying drawings and detailed description, it is to be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and that various equivalent modifications thereof can be made by those skilled in the art without inventive faculty after reading the present invention, which fall within the scope of the appended claims of the present application.
Detailed description of the preferred embodiment 1
As shown in fig. 1 to 3, the electro-gas welding method of the high-strength steel plate for the 49mm ship body comprises the following specific steps:
(1) setting a groove by using a test plate, wherein the test plate is made of high-strength steel EH36 for a ship body, the thickness of the test plate is 49mm, the required value of tensile strength is 490-630(MPa), the impact energy AKV at-20 ℃ of a welding joint is not less than 34J, the specification of a test piece is 1500mm (length) x 400mm (width) x 49mm (thickness), the welding groove is a single-sided V-shaped groove, the angle of the groove is 19 degrees, the gap 101 of the welding groove is 10mm, and no truncated edge is left on the welding groove;
(2) assembling the horse boards 2, welding and fixing the horse boards 2 and the steel plates 1 on the back of welding seams, and enabling the interval between the horse boards 2 to be 400 mm;
(3) installing a gasket 3 on the back of the welding groove, wherein the gasket 3 needs to be tightly adhered to the steel plate 1 by using a wood wedge 301 when the gasket 3 is installed, and when a transverse welding seam 8 is met, the gasket 3 needs to be installed after the extra height of the welding seam 8 is ground flat, so that welding leakage is prevented;
(4) a welding guide rail and a welding trolley are arranged on the front face of the welding groove and in a direction parallel to the welding groove, wherein the copper slide block 7 is connected with a circulating water cooling system;
(5) adopting electrogas welding to carry out single-side welding, adjusting the angle of a welding gun 4 to ensure that the surface of the welding gun 4 and a workpiece to be welded is 10 degrees, the flow rate of protective gas is 35L/min, the welding current is 450-470A, the welding voltage is 40-44V, the welding speed is 4 +/-1 cm/min, and the front side and the back side of a welding line 8 are formed at one time;
(6) after welding, the horse board 2 is cut off by gas cutting, the welding position is polished to be flat, and the welding trolley is dismantled.
Specific example 2
As shown in fig. 1 to 3, a method for electrogas welding of a high-strength steel plate for a 50mm ship body includes the following steps:
(1) setting a groove by using a test plate, wherein the test plate is made of high-strength steel EH36 for a ship body, the thickness of the test plate is 50mm, the required value of tensile strength is 490-630(MPa), the impact energy AKV at 0 ℃ of a welding joint is not less than 34J, the specification of a test piece is 1500mm (length) x 400mm (width) x 50mm (thickness), the welding groove is a single-sided V-shaped groove, the angle of the groove is 18 degrees, the gap 101 of the welding groove is 9mm, and no truncated edge is left on the welding groove;
(2) assembling the horse boards 2, welding and fixing the horse boards 2 and the steel plates 1 on the back of welding seams, and enabling the interval between the horse boards 2 to be 400 mm;
(3) installing a gasket 3 on the back of the welding groove, wherein the gasket 3 needs to be tightly adhered to the steel plate 1 by using a wood wedge 301 when the gasket 3 is installed, and when a transverse welding seam 8 is met, the gasket 3 needs to be installed after the extra height of the welding seam 8 is ground flat, so that welding leakage is prevented;
(4) a welding guide rail and a welding trolley are arranged on the front face of the welding groove and in a direction parallel to the welding groove, wherein the copper slide block 7 is connected with a circulating water cooling system;
(5) adopting electrogas welding to carry out single-side welding, adjusting the angle of a welding gun 4 to ensure that the surface of the welding gun 4 and a workpiece to be welded is 13 degrees, the flow rate of protective gas is 35L/min, the welding current is 450-470A, the welding voltage is 40-44V, the welding speed is 4 +/-1 cm/min, and the front side and the back side of a welding line 8 are formed at one time;
(6) after welding, the horse board 2 is cut off by gas cutting, the welding position is polished to be flat, and the welding trolley is dismantled.
Specific example 3
As shown in fig. 1 to 3, the electrogas welding method of the high-strength steel plate for the 42mm ship body comprises the following specific steps:
(1) setting a groove by using a test plate, wherein the test plate is made of high-strength steel EH36 for a ship body, the thickness of the test plate is 42mm, the required value of tensile strength is 490-630(MPa), the impact energy AKV at-20 ℃ of a welding joint is not less than 34J, the specification of a test piece is 1500mm (length) x 400mm (width) x 50mm (thickness), the welding groove is a single-sided V-shaped groove, the angle of the groove is 21 degrees, the gap 101 of the welding groove is 8mm, and no truncated edge is left on the welding groove;
(2) assembling the horse boards 2, welding and fixing the horse boards 2 and the steel plates 1 on the back of welding seams, and enabling the interval between the horse boards 2 to be 400 mm;
(3) installing a gasket 3 on the back of the welding groove, wherein the gasket 3 needs to be tightly adhered to the steel plate 1 by using a wood wedge 301 when the gasket 3 is installed, and when a transverse welding seam 8 is met, the gasket 3 needs to be installed after the extra height of the welding seam 8 is ground flat, so that welding leakage is prevented;
(4) a welding guide rail and a welding trolley are arranged on the front face of the welding groove and in a direction parallel to the welding groove, wherein the copper slide block 7 is connected with a circulating water cooling system;
(5) adopting electrogas welding to carry out single-side welding, adjusting the angle of a welding gun 4 to ensure that the surface of the welding gun 4 and a workpiece to be welded is 15 degrees, the flow rate of protective gas is 35L/min, the welding current is 450-470A, the welding voltage is 40-44V, the welding speed is 4 +/-1 cm/min, and the front side and the back side of a welding line 8 are formed at one time;
(6) after welding, the horse board 2 is cut off by gas cutting, the welding position is polished to be flat, and the welding trolley is dismantled.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (5)
1. The electrogas welding method of the high-strength steel plate for the 42-50mm ship body is characterized by comprising the following specific steps of:
(1) arranging a groove at a welding position, wherein the welding groove adopts a single-side V-shaped groove, the angle of the groove is 18-21 degrees, the gap of the welding groove is 9 +/-1 mm, and no truncated edge is left on the welding groove;
(2) assembling a horse plate, and welding and fixing the horse plate and a steel plate on the back of a welding line at a distance of 400 mm;
(3) installing a gasket on the back of the welding groove, wherein the gasket is required to be tightly attached to the steel plate by using a wood wedge when being installed, and the gasket is installed after the extra height of the welding line is ground when a transverse welding line is met, so that welding leakage is prevented;
(4) installing a welding guide rail and a welding trolley on the front surface of the welding groove in a direction parallel to the welding groove, wherein the copper slide block is connected with a circulating water cooling system;
(5) adopting electrogas welding to carry out single-side welding, adjusting the angle of a welding gun to ensure that the surface of the welding gun and a workpiece to be welded is 10-15 degrees, the flow of protective gas is 35L/min, the welding current is 450-470A, the welding voltage is 40-44V, the welding speed is 4 +/-1 cm/min, and the front side and the back side of a welding line are formed at one time;
(6) after welding, the horse board is cut off by gas cutting, the welding part is polished to be flat, and the welding trolley is dismantled.
2. The electrogas welding method for the high-strength steel plate for the 42-50mm ship body according to claim 1, wherein the horse plate and the steel plate are fixedly welded in the step (2), and the welding is performed by adopting a flux-cored arc welding mode.
3. The electrogas welding method for the high-strength steel plate for the 42-50mm ship body according to claim 1, wherein in the step (2), a rectangular through hole is formed in the middle of one welded side of the horse plate and the steel plate.
4. The method for electrogas welding of the high-strength steel plate for the 42-50mm ship body according to claim 1, wherein the electrogas welding in the step (4) adopts a welding wire with the diameter of 1.6 mm, and the extension length of the welding wire is 36-38 mm.
5. The electrogas welding method for the high-strength steel plate for the 42-50mm ship body according to claim 1, wherein the liner in the step (3) is a ceramic liner.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423983.6A CN114101867A (en) | 2021-11-26 | 2021-11-26 | Electrogas welding method for high-strength steel plate for 42-50mm ship body |
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| CN202111423983.6A CN114101867A (en) | 2021-11-26 | 2021-11-26 | Electrogas welding method for high-strength steel plate for 42-50mm ship body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114734124A (en) * | 2022-05-07 | 2022-07-12 | 广船国际有限公司 | Processing method of electrogas welding joint |
| CN116175060A (en) * | 2023-04-14 | 2023-05-30 | 华南理工大学 | Reverse welding horse plate technology for orthotropic steel bridge deck plate assembly welding positioning |
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Cited By (2)
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|---|---|---|---|---|
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| CN116175060A (en) * | 2023-04-14 | 2023-05-30 | 华南理工大学 | Reverse welding horse plate technology for orthotropic steel bridge deck plate assembly welding positioning |
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