CN111570967B - Method for assembling ultra-thick plate on double-layer bottom section - Google Patents
Method for assembling ultra-thick plate on double-layer bottom section Download PDFInfo
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- CN111570967B CN111570967B CN202010469351.2A CN202010469351A CN111570967B CN 111570967 B CN111570967 B CN 111570967B CN 202010469351 A CN202010469351 A CN 202010469351A CN 111570967 B CN111570967 B CN 111570967B
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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
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
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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
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
Abstract
The invention discloses an assembly method of an ultra-thick plate on a double-layer bottom section, which comprises the following steps: step one, arranging a K-shaped groove at the upper end of an ultra-thick plate, wherein the angle of the outer groove of the K-shaped groove is 45 degrees, and the angle of the inner groove is 30 degrees; vertically arranging six code plates on the outer surface of the ultra-thick plate at intervals along the longitudinal direction; the inner end surface of each code plate is fixed with the outer surface of the ultra-thick plate in a spot welding manner, and the top surface of each code plate is flush with the top surface of the ultra-thick plate; positioning the ultra-thick plate with the code plate installed on the inner bottom plate, and performing back burning before welding on a welding area at the top of the ultra-thick plate; welding a welding seam between the ultra-thick plate and the inner bottom plate in a full penetration welding mode; fifthly, welding and back burning are carried out on the welding area of the inner bottom plate and the ultra-thick plate; and step six, dismantling the code plate. The assembly method can greatly improve the deformation of the inner bottom plate caused by welding the ultra-thick plate and the inner bottom plate, and reduce the subsequent mechanical repair amount and the initiating explosive correction amount.
Description
Technical Field
The invention relates to an assembly method of an ultra-thick plate on a double-layer bottom section.
Background
At present, ships with more than ten thousand tons mainly adopt a double-layer bottom form. Stress condition of the double-layer bottom section: it bears the total longitudinal bending, water pressure, loads of goods, machines and the like, counter force of the pier wood during docking, and friction force between the pier wood and a river bed during grounding or sailing in a shallow water channel. The ship with the double-layer bottom structure mainly aims at improving the total longitudinal strength of the segments and further improving the stability of the ship body. The 40-million-ton ore carrier is the ore carrier with the largest tonnage in the whole world so far, has quite large construction difficulty, and the important consideration is how to improve the production environment of enterprises, improve the working efficiency and shorten the construction period under the PSPC standard. The 40 ten thousand ton ore sand ship has eight double-deck bottom sections that have super thick plate, and the vertical purlin GR0A of inner bottom is formed by ten boards concatenation on these eight double-deck bottom sections, and wherein has two super thick plates that thickness is 65mm, and remaining thick is no more than 50mm, and the top surface of these two super thick plates and the bottom surface welding of the interior bottom plate of double-deck bottom section. In the process of assembling the two ultra-thick plates, after the top surfaces of the two ultra-thick plates are welded with the bottom surface of the inner bottom plate, the inner bottom plate has a concave deformation phenomenon in the welding area, and the maximum concave depth reaches 15 mm. The main reason is that the welding deformation generates the recess during the straight welding, so that the mechanical repair amount and the fire correction amount of the two welding areas need to be increased subsequently.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an assembling method of an ultra-thick plate on a double-layer bottom section, which can greatly improve the welding deformation of the inner bottom plate of the double-layer bottom caused by the full-solution welding at the position of the ultra-thick plate and reduce the subsequent mechanical repair amount and the initiating correction amount.
One technical scheme for achieving the purpose of the invention is as follows: the assembly method of the ultra-thick plates on the double-layer bottom subsection comprises the steps that the double-layer bottom subsection comprises an outer bottom plate, an inner bottom plate, a middle longitudinal girder and a right middle longitudinal girder, the right middle longitudinal girder is formed by splicing ten plates, two ultra-thick plates with the thickness of 65mm are arranged in the double-layer bottom subsection, the length of each ultra-thick plate is 2500mm, the width of each ultra-thick plate is 1100mm, and the top surfaces of the two ultra-thick plates are welded with the edge of the right side of the bottom surface of the inner bottom plate of the double-layer bottom subsection;
the assembling method of the ultra-thick plate on the double-layer bottom section comprises the following steps:
step one, arranging a K-shaped groove at the upper end of an ultra-thick plate, wherein the angle of the outer groove of the K-shaped groove is 45 degrees, and the angle of the inner groove is 30 degrees;
vertically arranging six code plates on the outer surface of the ultra-thick plate at intervals along the longitudinal direction; the thickness of each code plate is 30mm or 32mm, the length of each code plate is 75mm, the width of each code plate is 200mm, a quarter arc with the radius of 35mm is arranged at the inner top end of each code plate, the inner end surface of each code plate is fixed with the outer surface of the ultra-thick plate in a spot welding manner, and the top surface of each code plate is flush with the top surface of the ultra-thick plate;
step three, erecting the ultra-thick plate with the code plate installed, placing the ultra-thick plate on the inner bottom plate, and performing pre-welding back burning on the welding area at the top of the ultra-thick plate after positioning;
welding a welding seam between the ultra-thick plate and the inner bottom plate in a full penetration welding mode;
fifthly, performing postwelding back burning on the welding area of the inner bottom plate and the ultra-thick plate;
and sixthly, disassembling all the stacking plates arranged on the two ultra-thick plates by using a flame cutting method.
The assembling method of the ultra-thick plate on the double-layer bottom section comprises the following steps of: the spacing distance between the four code plates positioned in the middle of the super-thick plate is 500mm, and the distance from the two code plates positioned on the two sides of the super-thick plate to the nearest code plate is 450 mm.
The assembling method of the ultra-thick plate on the double-layer bottom section is characterized in that the stacking plate is made of a marine steel plate.
The assembling method of the ultra-thick plate on the double-layer bottom section comprises the following steps of carrying out the third step and the fifth step, wherein the heating temperature of the back burning of the firer is 750-850 ℃, the heating speed is 4-40 mm/s, the heating depth is (0.6-0.8) t, t is the thickness mm of the back burning plate, and the heating width is 12-15 mm.
The method for assembling the ultra-thick plate on the double-layer bottom section has the following characteristics: the angle of the groove for forming the K-shaped groove at the upper end of the ultra-thick plate is changed from 45 degrees and 60 degrees to 45 degrees and 30 degrees, six stacking plates are arranged on the outer surface of the ultra-thick plate before welding for reinforcement, and the top of the ultra-thick plate is subjected to back burning before welding, so that the welding deformation of the ultra-thick plate to the inner bottom plate at the double-layer bottom during full-penetration welding can be greatly improved, the follow-up mechanical repair amount and the initiating explosive correction amount are reduced, the final horizontal deviation of the inner bottom plate to the interface is basically guaranteed to be within 2mm, the straightness of the plate edge is good, and no wave deformation exists, and the construction precision of a ship steel structure is effectively improved.
Drawings
FIG. 1 is a schematic structural view of a double bottom section of the present invention;
FIG. 2a is a schematic structural diagram of a code plate used in the second step of the method for assembling the ultra-thick plate on the double-layer bottom section of the present invention;
FIG. 2b is a side view of FIG. 2 a;
FIG. 3 is a layout diagram of a code plate in the second step of the method for assembling the ultra-thick plate on the double-layer bottom section of the invention;
fig. 4 is a state diagram of the assembling method of the ultra-thick plate on the double-bottom section of the present invention when step three is performed.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 4, the method for assembling the ultra-thick plate on the double-layer bottom section of the invention relates to the double-layer bottom section which is composed of an outer bottom plate 1, an inner bottom plate 2, a middle longitudinal girder and a right middle longitudinal girder 4, wherein the right middle longitudinal girder 4 is formed by splicing ten plates, two ultra-thick plates 40 with the thickness of 65mm are arranged in the double-layer bottom section, the length of the two ultra-thick plates 140 is 2500mm, the width of the two ultra-thick plates is 1100mm, and the top surfaces of the two ultra-thick plates 40 are welded with the right side edge of the bottom surface of the inner bottom plate 2 of the double-layer bottom section.
The method for assembling the ultra-thick plate on the double-layer bottom section comprises the following steps:
step one, arranging a K-shaped groove at the upper end of an ultra-thick plate 40, wherein the angle of the outer groove of the K-shaped groove is 45 degrees, and the angle of the inner groove is 30 degrees;
vertically arranging six code plates 5 on the outer surface of the ultra-thick plate 40 at intervals along the longitudinal direction, wherein the interval distance between the four code plates 5 positioned in the middle of the ultra-thick plate 40 is 500mm, and the distance from the two code plates 5 positioned on the two sides of the ultra-thick plate 40 to the nearest code plate 5 is 450 mm; the thickness B of each code plate 5 is 30mm or 32mm, and the code plates 5 are made of marine steel plates with models of AH32 or AH 36; the length L of each code plate 5 is 75mm, the width H is 200mm, a quarter arc with the radius R of 35mm is arranged at the inner top end of each code plate 5, the inner end surface of each code plate 5 is fixed with the outer surface of the ultra-thick plate 40 in a spot welding mode, and the top surface of each code plate 5 is flush with the top surface of the ultra-thick plate 40;
standing two ultra-thick plates 40 provided with the stacking plates 5 vertically and then placing the two ultra-thick plates on the inner bottom plate 2, wherein the top surfaces of the stacking plates 5 are also abutted against the inner bottom plate, and performing pre-welding back burning on the welding areas at the tops of the two ultra-thick plates 40 after positioning, wherein the heating temperature is 750-850 ℃, the heating speed is 4-40 mm/s, the heating depth is (0.6-0.8) t1, t1 is the thickness mm of the ultra-thick plates 40, and the heating width is 12-15 mm, so as to prevent the inner bottom plate 2 from generating welding deformation due to subsequent welding with the inner bottom plate 2;
welding seams between the two ultra-thick plates 40 and the inner bottom plate 2 in a full-penetration welding mode;
turning over and reversely buckling the double-layer bottom sections 10 of the other eight plates spliced with the right middle longitudinal girder 4 on the outer bottom plate 1, then welding the welding area of the top surface of the inner bottom plate 2 and the ultra-thick plate 40, and then performing back burning by firer, wherein the heating temperature is 750-850 ℃, the heating speed is 4-40 mm/s, the heating depth is (0.6-0.8) t, t2 is the thickness mm of the inner bottom plate 2, and the heating width is 12-15 mm, so as to eliminate residual stress generated on the inner bottom plate 2 during welding and correct deformation parts exceeding the deviation limit generated on the inner bottom plate 2;
and sixthly, detaching all the code plates 5 arranged on the two ultra-thick plates 40 by using a flame cutting method.
The method for assembling the ultra-thick plate on the double-layer bottom section has the following characteristics: the angle of the inner and outer grooves of the K-shaped groove formed in the upper end of the ultra-thick plate is changed from 45 degrees and 60 degrees to 45 degrees and 30 degrees, six stacking plates are arranged on the outer surface of the ultra-thick plate before assembly for reinforcement, and the top of the ultra-thick plate is subjected to back burning before welding, so that the welding deformation of the inner bottom plate during full penetration welding between the ultra-thick plate and the inner bottom plate can be greatly improved, the maximum deformation is only 3mm, the subsequent mechanical repair amount and the initiating explosive correction amount are reduced, the final horizontal deviation of the inner bottom plate to the joint is basically ensured to be within 2mm, the straightness of the plate edge is good, no wave deformation exists, and the construction precision of a ship steel structure is effectively improved. The method for assembling the ultra-thick plate on the double-layer bottom section is also suitable for fillet welding between other ultra-thick plates and plates which are slightly thinner than the ultra-thick plates.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (4)
1. The assembly method of the ultra-thick plates on the double-layer bottom section comprises an outer bottom plate, an inner bottom plate, a middle longitudinal girder and a right middle longitudinal girder, wherein the right middle longitudinal girder is formed by splicing ten plates, two ultra-thick plates with the thickness of 65mm are arranged in the double-layer bottom section, the length of each ultra-thick plate is 2500mm, the width of each ultra-thick plate is 1100mm, and the top surfaces of the two ultra-thick plates are welded with the edge of the right side of the bottom surface of the inner bottom plate of the double-layer bottom section; it is characterized in that the preparation method is characterized in that,
the assembling method of the ultra-thick plate comprises the following steps:
step one, arranging a K-shaped groove at the upper end of an ultra-thick plate, wherein the angle of the outer groove of the K-shaped groove is 45 degrees, and the angle of the inner groove is 30 degrees;
vertically arranging six code plates on the outer surface of the ultra-thick plate at intervals along the longitudinal direction; the thickness of each code plate is 30mm or 32mm, the length of each code plate is 75mm, the width of each code plate is 200mm, a quarter arc with the radius of 35mm is arranged at the inner top end of each code plate, the inner end surface of each code plate is fixed with the outer surface of the ultra-thick plate in a spot welding manner, and the top surface of each code plate is flush with the top surface of the ultra-thick plate;
step three, erecting the ultra-thick plate with the code plate installed, placing the ultra-thick plate on the inner bottom plate, and performing pre-welding back burning on the welding area at the top of the ultra-thick plate after positioning;
welding a welding seam between the ultra-thick plate and the inner bottom plate in a full penetration welding mode;
fifthly, performing postwelding back burning on the welding area of the inner bottom plate and the ultra-thick plate;
and sixthly, disassembling all the stacking plates arranged on the two ultra-thick plates by using a flame cutting method.
2. The method for assembling an ultra-thick plate on a double-layer bottom section according to claim 1, wherein the arrangement of the six code plates is as follows: the spacing distance between the four code plates positioned in the middle of the super-thick plate is 500mm, and the distance from the two code plates positioned on the two sides of the super-thick plate to the nearest code plate is 450 mm.
3. The method for assembling an extra-thick plate on a double-layer bottom section according to claim 1 or 2, wherein the material of the stacking plate is a ship steel plate.
4. The method for assembling an ultra-thick plate on a double-layer bottom section according to claim 1, wherein in the third step and the fifth step, the heating temperature of the back burning of the firer is 750-850 ℃, the heating speed is 4-40 mm/s, the heating depth is (0.6-0.8) t, t is the thickness mm of the back burning plate, and the heating width is 12-15 mm.
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| CN202010469351.2A CN111570967B (en) | 2020-05-28 | 2020-05-28 | Method for assembling ultra-thick plate on double-layer bottom section |
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| CN202010469351.2A CN111570967B (en) | 2020-05-28 | 2020-05-28 | Method for assembling ultra-thick plate on double-layer bottom section |
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| CN111570967B true CN111570967B (en) | 2021-06-11 |
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| US4327270A (en) * | 1977-03-28 | 1982-04-27 | Esab Aktiebolag | Submerged-arc spot welding apparatus |
| CN109202214A (en) * | 2017-06-30 | 2019-01-15 | 比亚迪股份有限公司 | Riding-type Monorail Switch beam and its welding method and web |
| CN110143255A (en) * | 2019-05-14 | 2019-08-20 | 上海外高桥造船有限公司 | The welding method of hull plated grillage device and hull plated grillage device |
| CN110877693A (en) * | 2019-11-15 | 2020-03-13 | 沪东中华造船(集团)有限公司 | Intelligent manufacturing method for double-layer bottom section of LNG ship |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4327270A (en) * | 1977-03-28 | 1982-04-27 | Esab Aktiebolag | Submerged-arc spot welding apparatus |
| CN109202214A (en) * | 2017-06-30 | 2019-01-15 | 比亚迪股份有限公司 | Riding-type Monorail Switch beam and its welding method and web |
| CN110143255A (en) * | 2019-05-14 | 2019-08-20 | 上海外高桥造船有限公司 | The welding method of hull plated grillage device and hull plated grillage device |
| CN110877693A (en) * | 2019-11-15 | 2020-03-13 | 沪东中华造船(集团)有限公司 | Intelligent manufacturing method for double-layer bottom section of LNG ship |
Non-Patent Citations (3)
| Title |
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| CSR船体角焊缝强度研究;余东方;《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》;20200515(第05期);C036-4 * |
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