CN102513664B - Actual ship assembly welding process for ultra-large high-precision base - Google Patents
Actual ship assembly welding process for ultra-large high-precision base Download PDFInfo
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Abstract
The invention discloses an actual ship assembly welding process for an ultra-large high-precision base, which includes the steps: respectively manufacturing a frame and cylinder units and then welding the cylinder units into the frame to form a base module; respectively welding rectangular cushion blocks and arc cushion blocks on a frame panel and cylinder panels of the base module; machining the top surface of the base module; performing allowance cutting and positioning for the base module; and welding the cylinder units of the base module on a deck and then welding the frame on the deck to complete welding of the base module. Deformation of a base structure is effectively controlled in links such as manufacturing, machining, mounting and the like, the requirements of the ultra-large base on manufacturing and mounting are met, and a fine platform is provided for accurately mounting large ship equipment.
Description
Technical field
The invention belongs to the Ship-Building Technology field, say more specifically for satisfy large ship equipment install required, and the technique of the manufacturing of the ultra-large type high-precision base of supporting design and real ship welding equipment.
Background technology
Several kilograms at least of the pedestals of common ship equipment, up to a hundred kilograms at most, version is also fairly simple, easily makes, processes and installation.But mounting base and the conventional equipment pedestal of some the large ship equipment that recently occurs have very large difference, diversity due to this ship equipment function, make its device structure very complex, specification requirement is high, as large in the Ship Structure opening size, for the required precision of its special a plurality of pedestals that are mutually related that are equipped with high especially, cause the precision control in the construction of structural design and real ship very difficult, the complete equipment installation difficulty of simple function equipment more in the past increases, and then causes the manufacturing of its matching pedestal and processing, welding equipment to require to increase.A plurality of the be mutually related large-scale pedestals of whole pedestal for designing according to large deck opening version and chips washing system.This pedestal is divided into left front, left back, right front, right back 4 base module independently, and 4 base module are the left and right, front and back are symmetrical.Each base module forms by 1 framework, 8 cylinder unit and several cushion blocks, 8 cylinder unit by the center line of each base module be the left and right, front and back are symmetrical.Whole pedestal gross weight reaches more than 10 tons, and its component part is numerous, and version is relative complex also.
Because the installation requirement of this large ship equipment is high, thereby manufacturing and the welding equipment of its pedestal are also had higher requirement, existing pedestal assembling and welding process peculiar to vessel can't satisfy this requirement.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of real ship assembling and welding process of ultra-large type high-precision base, with the installation accuracy requirement of the ultra-large type pedestal that guarantees to be consisted of by a plurality of base module that are mutually related, for the accurate installation of large ship equipment provides a good platform.
in order to solve the problems of the technologies described above, the present invention adopts following technical scheme: a kind of real ship assembling and welding process of ultra-large type high-precision base, described pedestal by four independently base module consist of, described four base module are the left and right, front and back are symmetrical, each base module includes the framework of a rectangle and is positioned at a plurality of cylinder unit of framework, every frame of described framework consists of by framework panel and framework web, the framework web is vertically connected on the bottom surface of framework panel, the outside of described framework is provided with polylith framework bracket, the framework bracket also is vertically connected on the bottom surface of framework panel, described cylinder unit comprises cylinder panel, cylinder web and cylinder bracket, the cylinder panel is annular, the cylinder web is vertically connected on the bottom surface of cylinder panel, and the cylinder bracket is connected between cylinder web and framework, and the real ship assembling and welding process of described pedestal comprises the following steps:
A. first make respectively framework and cylinder unit, the height dimension of described framework web, framework bracket, cylinder web and cylinder bracket is all reserved the cutting surplus, then each cylinder unit is welded in framework, forms base module;
B. at the framework panel of base module with weld respectively rectangle cushion block and arc cushion block above the cylinder panel, the thickness reserving machine allowance of each cushion block;
C. the base module end face is carried out machined, make the end face of all rectangle cushion blocks, arc cushion block satisfy the flatness requirement, and make the thickness of all rectangle cushion blocks, arc cushion block keep the 2-4mm machining allowance;
D. mark above deck center line and the outline line of base module according to the base module location dimension of drawing regulation, a base module is hung corresponding installation site on the deck;
E. selecting the end face center of 3 cushion blocks on base module is measurement point, measure respectively the height of base module, and check the levelness of each cushion block end face with scanner, according to measurement data and the drawing given size of each cushion block end face to beam line, mark the surplus line of cut of framework web, framework bracket, cylinder web and cylinder bracket;
F. to the framework web, the framework bracket, the height of cylinder web and cylinder bracket carries out surplus cutting for the first time, still keep 5mm cutting surplus after cutting, after base module is accurately located, again measure the height of levelness and the base module of each cushion block end face by the method identical with step e, according to measurement data, check the framework web, the framework bracket, whether the surplus line of cut of cylinder web and cylinder bracket needs to adjust, carry out surplus precise cutting for the second time, guarantee that each cushion block end face to the height of beam line is the drawing given size, and then this base module is located,
G. repeating step D～F also mixes up size and the position of all the other 3 base module;
H. first with the welding of the cylinder web of each cylinder unit of base module above deck, then with each cylinder bracket welding above deck, then with the welding of framework web above deck, again with the framework bracket welding above deck, complete the welding of a base module at last; According to identical mode, all the other 3 base module are also welded above deck.
Preferably, each base module comprises 1 framework and 8 cylinder unit, is provided with 15 rectangle cushion blocks above framework, and each is provided with 2 arc cushion blocks above cylinder unit.
Further, when being welded on each cylinder unit in framework, be symmetrically welded take the central point of framework as symmetrical centre by two welders.
Further, the frame of described framework comprises 3 vertical frames, 2 end frames and 6 horizontal frames, the framework panel of every frame and the corner connection weld seam of framework web are answered bevel, and use in accordance with regulations run-on tab and arc-extinguishing plate, the spacing of adjacent two vertical frames places 0.5mm welding shrinkage-compensating amount, and the spacing of the spacing of adjacent two horizontal frames and an adjacent horizontal frame and an end frame places 0.5mm and welds the shrinkage-compensating amount.
Further, when making framework, first mark frame center line and framework face plate profiles line on the iron platform, then described vertical frame, end frame and horizontal frame are in place, symmetry is carried out the butt welding of horizontal frame panel and vertical frame panel respectively from the centre to both sides, then hold the butt welding of frame panel and vertical frame panel, and then carry out the fillet welding of horizontal frame web, end frame web and vertical frame panel, symmetrical weld seam should be symmetrically welded with the even numbers welder.
Preferably, the cutting surplus of the height dimension of described framework web, framework bracket, cylinder web and cylinder bracket is 30mm.
Further, described cylinder unit also comprises 2 bar shaped panels, and the bar shaped panel stretches out in the both sides of cylinder panel, and the bar shaped panel is connected between cylinder panel and framework.
Further, when making cylinder unit, the cylinder web is divided into two semicircular cylinders carries out blanking, processing, then close up; Then the cylinder panel is positioned on smooth iron platform, mark the installation site line of cylinder panel central cross line and bar shaped panel, cylinder web, cylinder bracket, carrying out structure installs, the abutment joint of cylinder web should be positioned in the middle of two cylinder brackets, with angle steel, cylinder panel inner ring is made M shape and strengthens; First cylinder panel and cylinder web are welded together, the corner connection weld seam of cylinder panel and cylinder web is answered bevel, and uses in accordance with regulations run-on tab and arc-extinguishing plate; The bar shaped panel is welded on the cylinder panel, bevel is also answered in the butt weld of bar shaped panel and cylinder panel again, and uses in accordance with regulations run-on tab and arc-extinguishing plate, then carries out symmetrically the welding of cylinder bracket.
Preferably, when welding, adopt CO
2Gas shielded arc welding should adopt a minute middle backstep welding for longer weld seam.
Preferably, in step H, first by from the middle to both ends order with the cylinder web welding of each cylinder unit of base module above deck, then by same sequence with the cylinder bracket welding of each cylinder unit above deck.
the real ship assembling and welding process of the present invention parts machining manufacture is reasonable, welding method, parameter, select progressively is appropriate, assembly method and order are proper, easy operating, be convenient to grasp, by placing the cutting surplus, welding contracted quantity, machining allowance, the reasonable distribution of interior outfield processing thickness and precision index, structural strengthening, welding method, sequentially, the reasonable selection of technological specification, from making, processing, each links such as installation have effectively been controlled the distortion of base construction, manufacturing and the installation accuracy requirement of ultra-large type pedestal have been guaranteed, for the accurate installation of large ship equipment provides a good platform.
Description of drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is a kind of structural representation of ultra-large type high-precision base.
Fig. 2 is the structural representation of single base module.
Fig. 3 is the distribution schematic diagram of cushion block above base module.
Fig. 4 is the structural representation of single cylinder unit.
Fig. 5 is the structural representation of framework.
Fig. 6 be in Fig. 5 frame in the cross sectional representation at I-I place.
The specific embodiment
A kind of large ship equipment adopts the ultra-large type high-precision base to install above deck, as shown in Figure 1, this pedestal by four independently base module 100 consist of, these four base module 100 are the left and right, front and back are symmetrical.
As shown in Figure 2, each base module includes the framework 1 of a rectangle and is positioned at a plurality of cylinder unit 2 of framework, and in the present embodiment, each base module comprises 1 framework and 8 cylinder unit.As shown in Figure 5, the frame of framework 1 comprises 3 vertical frames 11,2 end frames 12 and 6 horizontal frames 13, every frame consists of (seeing Fig. 6) by framework panel 15 and framework web 16, framework web 16 is vertically connected on the bottom surface of framework panel 15, the outside at vertical frame 11 also is provided with polylith framework bracket 14, and framework bracket 14 also is vertically connected on the bottom surface of framework panel 15.
As shown in Figure 4, described cylinder unit 2 comprises cylinder panel 21, cylinder web 23 and cylinder bracket 24, cylinder panel 21 is annular, cylinder web 23 is vertically connected on the bottom surface of cylinder panel 21, cylinder bracket 24 is outside radial extension along the outer ring of cylinder web 23, and is connected between cylinder web 23 and framework 1.In this preferred embodiment, cylinder unit 2 also comprises 2 bar shaped panels 22, and bar shaped panel 22 stretches out in the both sides of cylinder panel 21, and is connected between cylinder panel 21 and framework panel.
As shown in Figure 2, weld respectively a plurality of rectangle cushion blocks 3 and arc cushion block 4 at the framework panel with above the cylinder panel, as shown in Figure 3, in the present embodiment, along every vertical frame, 5 rectangle cushion blocks 3 are set, rectangle cushion block 3 is arranged on vertical frame and the intersection point place of holding frame or horizontal frame; And two relative arc cushion blocks 4 are set above cylinder unit at each.
The real ship assembling and welding process of the present invention comprises the following steps:
A. first make respectively cylinder unit and framework, then each cylinder unit is welded in framework, form base module.
(1) manufacturing of cylinder unit
Single cylinder unit is comprised of 1 cylinder panel, 2 bar shaped panels, 1 block of cylinder web, 10 cylinder brackets.Circular barrel surface slab integral cutting, external diameter, internal diameter directly cutting put in place, do not reserve allowance.Though pedestal deck of living in vertically, laterally is being level, consider the impact of Hull Welding distortion, the height dimension of all cylinder webs and cylinder bracket is all put 30mm cutting surplus, cuts after building berth is installed the location.The cylinder web can be divided into two semicircular cylinders and carry out blanking, processing, then cylinder web two parts is closed up.
Mark the installation site line of cylinder panel central cross line and bar shaped panel, cylinder web, cylinder bracket, carry out structure and install, the abutment joint of cylinder web should be positioned in the middle of two cylinder brackets, with angle steel, cylinder panel inner ring is made M shape and strengthens.Cylinder panel and cylinder web should first weld and through welding, and because the material of cylinder panel and cylinder web is thicker, its corner connection weld seam is answered bevel, and uses in accordance with regulations run-on tab and arc-extinguishing plate; The bar shaped panel is welded on the cylinder panel, the cylinder panel also should be by above requirement with docking of bar shaped panel again.Panel and web corner connection seam should adopt gas shielded arc welding, then symmetrically with the cylinder bracket welding on the cylinder web.The unit welding equipment marks the unit center line after finishing on the cylinder panel, and strikes the steel drift seal.Postwelding carries out plate fairing by hot working to welding deformation, and repairs the assembling something that gives the game away, polishing cutting burr, the flatness≤2.0mm of control cylinder panel.
(2) manufacturing of framework
Each framework panel is whole cutting all.Though pedestal deck of living in vertically, laterally is being level, consider the impact of Hull Welding distortion, the height dimension of all framework webs and framework bracket is all put 30mm cutting surplus, cuts after building berth is installed the location.The spacing of adjacent two vertical frames places 0.5mm welding shrinkage-compensating amount, and the spacing of the spacing of adjacent two horizontal frames and an adjacent horizontal frame and an end frame also places 0.5mm and welds the shrinkage-compensating amount.
Each frame of framework is all for by the framework panel T-shaped parts that fillet welding becomes with the framework web, and because the material of framework panel and framework web is thicker, its corner connection weld seam is answered bevel, and uses in accordance with regulations run-on tab and arc-extinguishing plate.When making these T-shaped parts; the corner connection seam of framework panel and framework web should adopt gas shielded arc welding and through welding; a backstep welding in should adopting minute for longer weld seam (is in order to reduce welding deformation, to allow welding stress progressively discharge and a kind of welding procedure of taking; exactly weld seam is begun to be divided into several sections from the middle part; the whole piece weld seam welds to both sides piecemeal from the centre; but every section weld seam is toward middle weldering, generally by two people's symmetrical weldings from the outside).After each frame manufacturing is complete, welding deformation is carried out plate fairing by hot working, the flatness of control framework panel is answered≤2.0mm.
Frame assembled should carry out on smooth iron platform.First mark frame center line and framework face plate profiles line on the iron platform, then each vertical frame, end frame and horizontal frame are in place, symmetry is carried out the butt welding of horizontal frame panel and vertical frame panel respectively from the centre to both sides, then hold the butt welding of frame panel and vertical frame panel, and then carrying out the fillet welding of horizontal frame web, end frame web and vertical frame panel, symmetrical weld seam should be symmetrically welded with the even numbers welder.
Frame assembled marks the frame center line after finishing on the framework panel, and strikes the steel drift seal.Postwelding carries out plate fairing by hot working to welding deformation, and repairs the assembling something that gives the game away, polishing cutting burr, the flatness≤2.0mm of control framework panel.
(3) base module closes up
Carry out closing up of cylinder unit and framework on frame assembled iron platform.Preferably be symmetrically welded take the central point of framework as symmetrical centre by two welders, as shown in Figure 2, successively each cylinder unit be welded in framework according to the order of A, B, C, D.During welding, first the bar shaped panel with cylinder unit docks with the framework panel, then each cylinder bracket and framework panel are carried out fillet welding.
After cylinder unit and framework closed up end, integral body was stood up and is placed on the iron platform, made framework panel, cylinder panel up.Mark the pedestal center line on the framework panel, and strike the steel drift seal.Postwelding carries out plate fairing by hot working to welding deformation, controls the flatness≤2.0mm of each panel.
The butt weld of all panels of base module must be done the ultrasonic examination inspection at postwelding, and qualified rear submission is checked and accepted.
Make 4 identical base module by above-mentioned steps.
B. at the framework panel of each base module with weld respectively rectangle cushion block and arc cushion block above the cylinder panel.
Because the flatness of each cushion block end face on the single base module of designing requirement is 0.3mm, required precision is very high, consider that the pedestal internal field is made and the building berth installation process in welding deformation on the impact of flatness etc., thickness (highly) size of each cushion block is reserved the 8mm machining allowance; All the other sizes directly cutting put in place, do not reserve allowance.
Each cushion block answers symmetry to carry out in the welding equipment process, and limit welding, limit are measured, and flatness is carried out tracking measurement and inspection, and postwelding carries out plate fairing by hot working to welding deformation, controls the flatness≤2.0mm of each cushion block end face.
C. in the internal field, the base module end face is carried out machined, make the end face of all rectangle cushion blocks, arc cushion block satisfy the flatness requirement; Will consider simultaneously the impact of building berth welding equipment distortion, still make the thickness of all rectangle cushion blocks, arc cushion block keep the 2-4mm machining allowance after machined, this allowance is when keeping for equipment to install, base top surface to be carried out mach surplus.
D. before pedestal was installed, the work such as body section structure welding equipment and revise should finish.In order to guarantee required precision, in the base stand location process, inspection, the survey tool such as tape measure used, total powerstation should be qualified through metering test.The detection of the pedestal depth of parallelism should be carried out before shipowner's reference platform is installed, and take the hull datum line as horizontal reference, the welding equipment of pedestal, processing should be carried out under the operating condition of peripheral friction impact.
Mark above deck center deck line and installation region rib potential theory line, mark above deck center line and the outline line of base module according to the base module location dimension of drawing regulation, a base module is hung corresponding installation site on the deck.
E. take each cushion block end face of nearly midship place as benchmark, selecting the end face center of 3 cushion blocks on base module is measurement point, measure respectively the height of base module, and check the levelness of each cushion block end face with scanner, according to measurement data and the drawing given size of each cushion block end face to beam line (being generally the deck lower surface), determine the height of base module, mark the surplus line of cut of framework web, framework bracket, cylinder web and cylinder bracket.
F. to the framework web, the framework bracket, the height of cylinder web and cylinder bracket carries out surplus cutting for the first time, still keep 5mm cutting surplus after cutting, after base module is accurately located, again measure the height of levelness and the base module of each cushion block end face by the method identical with step e, according to measurement data, check the framework web, the framework bracket, whether the surplus line of cut of cylinder web and cylinder bracket needs to adjust, carry out surplus precise cutting for the second time, guarantee that each cushion block end face to the height of beam line is the drawing given size, this size comprises that each cushion block is when equipment is installed, the part processing on ship surplus of reserving according to installation accuracy and needs, and then this base module is located.
G. repeating step D～F also mixes up size and the position of all the other 3 base module, and guarantees that 4 base module are contour.
H. first with the welding of the cylinder web of each cylinder unit of base module above deck, then with each cylinder bracket welding above deck, can arrange two welders to be symmetrically welded according to from the middle to both ends order, namely also press the order of A shown in Figure 2, B, C, D with each cylinder unit and deck fillet welding, then with the welding of framework web above deck, again with the framework bracket welding above deck, complete the welding of a base module at last; According to identical mode, all the other 3 base module are also welded above deck.The installation of 4 base module can symmetry be carried out, such as being undertaken by left back, right back, left front, right front order.
In above-mentioned welding step of the present invention, can adopt CO
2Gas shielded arc welding.For the long weld seam of length, as the angle welding on angle welding, cylinder web and the deck on framework web and deck etc., should adopt a minute middle backstep welding.
The problem of the aspects such as in welding process, reply base module position and cushion block end face levelness are carried out tracking measurement and inspection (comprising the measurement to other base module on the adjacent position), and be as overproof in the discovery welding deformation should in time be taked corresponding measure.Remove the M shape of each cylinder panel inner ring after welding finishes and strengthen, submit to and check and accept.And measurement point and method when locating by base module carry out the measurement of cushion block end face levelness and base module height, for the processing of determining building berth stage base top surface provides the coherent reference data.
The present invention is applicable to manufacturing and the real ship welding equipment of the ultra-large type high-precision base that is made of a plurality of base module that are mutually related, such as, each base module is of a size of 4100mm (length) x 2180mm (wide), face plate of foundation (being comprised of framework panel and cylinder panel) upper surface is 280mm to the height of beam line, and the end face of each cushion block that welds on face plate of foundation to the height of beam line is 300mm.The weight of each base module is up to 2500 kilograms, and whole pedestal gross weight reaches 10 tons.The present invention can be widely used in manufacturing and the real ship welding equipment of this large-scale pedestal.
Claims (10)
1. the real ship assembling and welding process of a ultra-large type high-precision base, described pedestal by four independently base module consist of, described four base module are the left and right, front and back are symmetrical, each base module includes the framework of a rectangle and is positioned at a plurality of cylinder unit of framework, every frame of described framework consists of by framework panel and framework web, the framework web is vertically connected on the bottom surface of framework panel, the outside of described framework is provided with polylith framework bracket, and the framework bracket also is vertically connected on the bottom surface of framework panel; Described cylinder unit comprises cylinder panel, cylinder web and cylinder bracket, the cylinder panel is annular, and the cylinder web is vertically connected on the bottom surface of cylinder panel, and the cylinder bracket is connected between cylinder web and framework, it is characterized in that, the real ship assembling and welding process of described pedestal comprises the following steps:
A. first make respectively framework and cylinder unit, the height dimension of described framework web, framework bracket, cylinder web and cylinder bracket is all reserved the cutting surplus, then each cylinder unit is welded in framework, forms base module;
B. at the framework panel of base module with weld respectively rectangle cushion block and arc cushion block above the cylinder panel, the thickness reserving machine allowance of each cushion block;
C. the base module end face is carried out machined, make the end face of all rectangle cushion blocks, arc cushion block satisfy the flatness requirement, and make the thickness of all rectangle cushion blocks, arc cushion block keep the 2-4mm machining allowance;
D. mark above deck center line and the outline line of base module according to the base module location dimension of drawing regulation, a base module is hung corresponding installation site on the deck;
E. selecting the end face center of 3 cushion blocks on base module is measurement point, measure respectively the height of base module, and check the levelness of each cushion block end face with scanner, according to measurement data and the drawing given size of each cushion block end face to beam line, mark the surplus line of cut of framework web, framework bracket, cylinder web and cylinder bracket;
F. to the framework web, the framework bracket, the height of cylinder web and cylinder bracket carries out surplus cutting for the first time, still keep 5mm cutting surplus after cutting, after base module is accurately located, again measure the height of levelness and the base module of each cushion block end face by the method identical with step e, according to measurement data, check the framework web, the framework bracket, whether the surplus line of cut of cylinder web and cylinder bracket needs to adjust, carry out surplus precise cutting for the second time, guarantee that each cushion block end face to the height of beam line is the drawing given size, and then this base module is located,
G. repeating step D～F also mixes up size and the position of all the other 3 base module;
H. first with the welding of the cylinder web of each cylinder unit of base module above deck, then with each cylinder bracket welding above deck, then with the welding of framework web above deck, again with the framework bracket welding above deck, complete the welding of a base module at last; According to identical mode, all the other 3 base module are also welded above deck.
2. real ship assembling and welding process according to claim 1, is characterized in that, each base module comprises 1 framework and 8 cylinder unit, is provided with 15 rectangle cushion blocks above framework, and each is provided with 2 arc cushion blocks above cylinder unit.
3. real ship assembling and welding process according to claim 2, is characterized in that, when being welded on each cylinder unit in framework, is symmetrically welded take the central point of framework as symmetrical centre by two welders.
4. real ship assembling and welding process according to claim 2, it is characterized in that, the frame of described framework comprises 3 vertical frames, 2 end frames and 6 horizontal frames, the framework panel of every frame and the corner connection weld seam of framework web are answered bevel, and use in accordance with regulations run-on tab and arc-extinguishing plate, the spacing of adjacent two vertical frames places 0.5mm welding shrinkage-compensating amount, and the spacing of the spacing of adjacent two horizontal frames and an adjacent horizontal frame and an end frame places 0.5mm and welds the shrinkage-compensating amount.
5. real ship assembling and welding process according to claim 4, it is characterized in that, when making framework, first mark frame center line and framework face plate profiles line on the iron platform, then described vertical frame, end frame and horizontal frame are in place, symmetry is carried out the butt welding of horizontal frame panel and vertical frame panel, the butt welding of then holding frame panel and vertical frame panel respectively from the centre to both sides, and then carrying out the fillet welding of horizontal frame web, end frame web and vertical frame panel, symmetrical weld seam should be symmetrically welded with the even numbers welder.
6. real ship assembling and welding process according to claim 1, is characterized in that, the cutting surplus of the height dimension of described framework web, framework bracket, cylinder web and cylinder bracket is 30mm.
7. real ship assembling and welding process according to claim 1, is characterized in that, described cylinder unit also comprises 2 bar shaped panels, and the bar shaped panel stretches out in the both sides of cylinder panel, and the bar shaped panel is connected between cylinder panel and framework.
8. real ship assembling and welding process according to claim 7, is characterized in that, when making cylinder unit, the cylinder web is divided into two semicircular cylinders carries out blanking, processing, then close up; Then the cylinder panel is positioned on smooth iron platform, mark the installation site line of cylinder panel central cross line and bar shaped panel, cylinder web, cylinder bracket, carrying out structure installs, the abutment joint of cylinder web should be positioned in the middle of two cylinder brackets, with angle steel, cylinder panel inner ring is made M shape and strengthens; First cylinder panel and cylinder web are welded together, the corner connection weld seam of cylinder panel and cylinder web is answered bevel, and uses in accordance with regulations run-on tab and arc-extinguishing plate; The bar shaped panel is welded on the cylinder panel, bevel is also answered in the butt weld of bar shaped panel and cylinder panel again, and uses in accordance with regulations run-on tab and arc-extinguishing plate, then carries out symmetrically the welding of cylinder bracket.
9. real ship assembling and welding process according to claim 1, is characterized in that, when welding, adopts CO
2Gas shielded arc welding should adopt a minute middle backstep welding for longer weld seam.
10. real ship assembling and welding process according to claim 1, it is characterized in that, in step H, first by from the middle to both ends order with the cylinder web welding of each cylinder unit of base module above deck, then by same sequence with the cylinder bracket welding of each cylinder unit above deck.
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