CN115178830A

CN115178830A - Welding method for carrying outboard plate on board side

Info

Publication number: CN115178830A
Application number: CN202210725257.8A
Authority: CN
Inventors: 陈庆城; 陈秋贵; 李巧蕊; 黄旭攀; 李国安; 张八虎; 郑银清
Original assignee: Guangzhou Shipyard International Co Ltd
Current assignee: Guangzhou Shipyard International Co Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-10-14

Abstract

The invention provides a welding method for carrying a side outer plate, which comprises the following steps: arranging a V-shaped outer groove on the adjacent side outer plate; fixing a ceramic liner on the inner side of the side shell plate; filling the V-shaped outer groove with a molten welding wire outside the side outer plate, thereby welding and fixing the adjacent side outer plates; wherein the side outer plate is inclined outward; the assembling and welding method for carrying the side outer plate improves the operation environment of welding in a closed space and effectively improves the efficiency; the broadside inclined sectional automatic welding propulsion is developed, and the labor intensity of welders is reduced; the welding defects of slag inclusion and the like caused by multilayer multi-pass welding of the ship side outer plate by manual CO2 welding are avoided, and the welding quality is improved.

Description

Welding method for carrying side outer plate

Technical Field

The invention relates to the field of ship equipment, in particular to a welding method for carrying a side outer plate.

Background

In the process of building the luxurious ro-ro vessel, in order to effectively improve the advancing and turning speed of the ro-ro vessel, the outer plate of the underwater part of the main hull (particularly the bow of the swell) is designed to be inclined and inclined in a pitch manner with wide top and narrow bottom, so that the underwater resistance is reduced, the contact area of the bow and seawater is reduced, the friction force is reduced, and the advancing and turning speed of the vessel is improved. The wide-down-narrow inclined pitch on the side of the ro-ro passenger mainly is because the deck of the ro-ro passenger serves as a lane and stops, and the wide-down-narrow inclined pitch on the side is designed to ensure that the ro-ro passenger can ensure 'tumbler' and enough strength, and various narrow cabins are designed (see the following figure). The mounting and welding method for the outboard plate in the inclined pitch mode with wide upper part and narrow lower part on the side is as follows, and referring to fig. 1:

a) An inner V-shaped outer groove is assembled on the side outer plate 1', the truncated edge is 0-1mm, the gap is 6-8mm, and the side outer plate is fixed on the outer plate code plate.

b) A ceramic liner is pasted on the side outer plate, and climbing welding is carried out in the side cabin by manual CO2 welding to form a 4-welding seam 11'.

c) After the inside of the V-shaped groove is welded, due to the influence of various narrow cabins, structural brackets and the like, the welding seam of the outer plate part is poor in forming or has welding defects, and the side outer plate needs to be processed by carbon arc air gouging and opening a U-shaped groove 12'.

d) And carrying out electric welding operation on the U-shaped groove of the outboard plate by adopting manual CO2 welding to form an outer welding seam 13' of 2 welding.

After the assembly of the underwater part of the shipboard of the main hull of the luxury ro-ro passenger ship is finished, the internal space is a closed narrow space, so that more closed narrow cabins are formed, the deck stops as a lane, the powerful structure is more, the electric welding workload is large, the operation difficulty is relatively higher, a large amount of smoke and dust can be generated in a short time in the operation process, and the environment is severe. The prior art has the following problems:

1. because the inboard confined narrow space of side cabin has the obstacle such as many powerful structures and piping, and the welding sight is obstructed and operation posture is obstructed, and welding technical requirement is high, and the welding operation degree of difficulty is big.

2. In a closed narrow space with less than 10m & lt 3 & gt of the inboard side, 4-channel welding operation needs to be carried out on the butt joint in the inboard side, a large amount of welding smoke is generated and revolves in the cabin with non-convective air, and the construction operation environment of workers is severe.

3. Due to the obstacles of a closed narrow cabin, a strong structure, piping system and the like, the operation environment is severe, so that the welding quality cannot reach an ideal expectation, after RT and UT flaw detection after welding, the primary qualified rate is 87%, and the repair quantity is large.

4. Due to the obstacles of a plurality of strong structures, piping systems and the like, welding sight and operation posture are obstructed, poor welding seams of the outer plate or welding defects exist, the welding needs to be processed by a method of carbon arc air gouging back gouging and U-shaped groove opening on the side outer plate, and the efficiency needs to be improved.

Disclosure of Invention

Accordingly, it is necessary to provide a welding method for mounting a side shell plate, which has high welding efficiency and good quality and can improve the working environment.

The invention provides a welding method for carrying a side outer plate, which comprises the following steps:

arranging a V-shaped outer groove on the adjacent side outer plates;

fixing a ceramic liner on the inner side of the side shell plate;

filling the V-shaped outer groove with a molten welding wire to form a welding seam on the outer side of the side shell plate, and welding and fixing the adjacent side shell plates;

wherein the side outer plate is inclined outward.

Preferably, the angle of the groove on the outer side of the V shape is 20-24 degrees, and the gap of the groove is 8-12mm.

Preferably, a forming groove is formed in the ceramic liner, the forming groove is arc-shaped, the maximum depth of the forming groove is 1mm-2.5mm or 1.8mm-2mm, the ceramic liner comprises a plurality of unit ceramic liners, the unit ceramic liners extend along the length direction of the V-shaped outer groove, and the unit ceramic liners are sequentially connected end to end.

Preferably, fixing the ceramic liner comprises the steps of:

taking a code clamping plate, and fixing the code clamping plate on the inner wall of the shipboard outer plate by welding, wherein a fixing groove corresponding to the V-shaped outer groove is formed in the code clamping plate;

taking a unit ceramic liner, putting the unit ceramic liner into the fixing groove, and aligning the central line of the forming groove with the central line of the V-shaped outer groove;

taking a fixing wedge, and driving the fixer into the unit ceramic liner and the code clamping plate through external force to ensure that the ceramic liner is attached to the inner wall of the side outer plate;

and repeating the steps until the ceramic liner is fixed in the extending direction of the V-shaped outer groove.

Preferably, a crawling track is fixed on the outer side of the side outer plate, the crawling track extends along the V-shaped outer groove, welding equipment is arranged on the crawling track, and the welding equipment slides along the crawling track; the welding equipment comprises a moving mechanism and a welding machine, wherein the welding machine is fixed on the moving mechanism and comprises a welding gun, and a welding wire is arranged on the welding gun.

Preferably, during welding, the inclination angle of the welding wire relative to the horizontal plane is 3-6 degrees or 4-5 degrees smaller than the inclination angle of the middle line of the V-shaped outer groove relative to the horizontal plane; the inclination angle of the central line of the V-shaped outer groove relative to the horizontal plane is more than or equal to 25 degrees.

Preferably, the track of crawling includes magnetism and inhales structure and flexible aluminium track, magnetism inhale the mechanism with flexible aluminium track fixed connection, the track of crawling passes through magnetism is inhaled the structure and is fixed the outside of topside planking.

Preferably, the welding equipment further comprises a sliding block pressing frame and a water-cooling sliding block, the sliding block pressing frame is fixed at the rear end of the moving mechanism, the water-cooling sliding block is fixed on the sliding block pressing frame, and the water-cooling sliding block is used for pressing a welding seam;

the water-cooling sliding block is provided with a water inlet and a water outlet, the water-cooling sliding block is fixed on the moving mechanism, and at least part of the water-cooling sliding block is overlapped with the free end of the welding wire in the vertical direction.

Preferably, during welding, a welding surface of the welding seam and a central line of the V-shaped outer groove form an acute angle, a molten pool is formed on the welding surface, and the molten welding wire is located in the molten pool.

The beneficial effects of the invention are as follows:

the invention improves the operation environment of welding in the closed space and effectively improves the efficiency; the automatic welding propulsion of the broadside inclined section is developed, and the labor intensity of welders is reduced; the welding defects of slag inclusion and the like caused by multilayer multi-pass welding of the ship side outer plate by manual CO2 welding are avoided, and the welding quality is improved.

Drawings

The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual size, emphasis instead being placed upon illustrating the subject matter.

FIG. 1 is a schematic flow chart of a welding method for carrying a side shell plate in the prior art;

FIG. 2 is a schematic view of a welding method for mounting a side shell according to the present invention;

FIG. 3 is a schematic view of the positions of two adjacent side planks;

FIG. 4 is a schematic top view of two adjacent side planks during welding;

FIG. 5 is a schematic cross-sectional view of the present invention during welding;

FIG. 6 is a schematic view of a crawling track of the present invention;

FIG. 7 is a schematic view of the construction of the ceramic liner of the present invention secured by a code plate and a retaining wedge;

FIG. 8 is an overall structural view of the ceramic backing plate of the present invention;

FIG. 9 is an overall view of the fixed wedge of the present invention;

FIG. 10 is a schematic structural diagram of a water-cooled slider according to the present invention;

FIG. 11 is a view of the detection points set after welding using the present invention;

fig. 12 is an external view of a weld.

In the figure: 1. a side shell plate; 11. a V-shaped outer groove; 2. a ceramic liner; 21. forming a groove; 3. fixing the wedge; 4. a code clamping plate; 41. fixing grooves; 5. crawling a track; 51. a magnetic attraction structure; 52. a flexible aluminum track; 6. welding equipment; 61. a moving mechanism; 62. a welding machine; 621. silk; 622. an air inlet; 8. water-cooling the slide block; 81. a water inlet; 82. a water outlet; 9. welding; 91. and (4) melting the pool.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "one end," "the other end," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 2 to 12, the present invention provides a welding method for mounting a side shell 1, including the steps of:

a V-shaped outer groove 11 is formed on the adjacent side outer plate 1;

fixing a ceramic liner 2 on the inner side of the side shell plate 1;

filling the V-shaped outer groove 11 with a molten welding wire 621 to form a weld bead outside the side outer panel 1, thereby welding and fixing the adjacent side outer panels 1;

wherein the side shell 1 is inclined outward.

The invention improves the operation environment of welding in the closed space and effectively improves the efficiency; the oblique and segmented automatic welding propulsion of the side outer plate 1 is developed, and the labor intensity of welders is reduced; the welding defects of slag inclusion and the like caused by multilayer multi-pass welding of the ship side outer plate 1 by manual CO2 welding are avoided, and the welding quality is improved.

Before welding, the non-allowance plate of the side outer plate 1 is corrected according to the groove standard after being assembled, the plate with the allowance is cut on site after being assembled, but the longitudinal bone joint is required to be not welded temporarily before cutting, and the groove size after cutting must meet the tolerance requirement. If the thickness of two adjacent plates is not equal, the part with the height higher than the unevenness is ground obliquely, and the inclination size is 60-80 mm. And (3) removing burrs, horse feet, metal splashes and the extra height of a welding seam 9 of a longitudinal joint by using a grinding wheel within 50mm of two sides of the edge of the groove, removing moisture, rust, oil stains and the like, and ensuring that the water-cooling sliding block 8 on the front surface of the V-shaped outer groove 11 slides smoothly and the liner on the back surface of the groove is attached tightly.

In the preferred embodiment, the angle of the V-shaped outer groove 11 is 20-24 ° (i.e. the angle formed by the opposite sides of two adjacent side plates 1, refer to the figure in particular), and the groove gap is 8-12mm.

In the preferred embodiment, the ceramic liner 2 is provided with a forming groove 21, the forming groove 21 is arc-shaped, and the maximum depth of the forming groove 21 is 1mm-2.5mm or 1.8mm-2mm. Referring to fig. 8, the ceramic liner 2 includes a plurality of unit ceramic liners extending in a length direction of the V-shaped outer bevel 11, and the plurality of unit ceramic liners are sequentially connected end to end.

Referring to fig. 7, in a preferred embodiment, the ceramic liner 2 is secured, including the steps of:

taking a code clamping plate 4, fixing the code clamping plate 4 on the inner wall of the shipboard outer plate 1 by welding, and arranging a fixing groove 41 corresponding to the V-shaped outer groove 11 on the code clamping plate 4;

taking a unit ceramic liner, putting the unit ceramic liner into the fixing groove 41, and aligning the central line of the forming groove 21 with the central line of the V-shaped outer groove 11;

taking a fixing wedge 3, and driving a fixer into the unit ceramic liner and the code clamping plate 4 through external force to enable the ceramic liner 2 to be attached to the inner wall of the side outer plate 1;

and repeating the steps until the ceramic liner 2 is fixed in the extending direction of the V-shaped outer groove 11.

According to the designed V-shaped outer groove 11, the inboard side (the back of the joint of the V-shaped outer groove) of the side cabin is provided with a clamp plate 4 for fixing, a clamp is arranged at intervals of 250-300mm, the clamp is welded firmly, the plane of the groove is not staggered, the front of the V-shaped outer groove is strictly forbidden to be provided with obstacles such as clamp, row bar reinforcement and the like, and the welding trolley is ensured to walk smoothly and continuously without obstacles.

Referring to fig. 2 and 6, in a preferred embodiment, a crawling rail 5 is fixed on the outer side of the side shell board 1, the crawling rail 5 extends along a V-shaped outer groove 11, a welding device 6 is arranged on the crawling rail 5, and the welding device 6 slides along the crawling rail 5; the welding device 6 comprises a moving mechanism 61 and a welding machine 62, wherein the welding machine 62 is fixed on the moving mechanism 61, and the welding machine 62 comprises a welding gun on which a welding wire 621 is arranged. In this embodiment, the moving mechanism 61 is a welding auxiliary cart, a CO2 welding torch is clamped by the welding auxiliary cart, and the carbon dioxide gas is introduced into the gas inlet 622. A gear track (in the embodiment, the crawling track 5 is a gear track) fixed beside the welding seam 9, and CO2 gas slag shielded welding is carried out from the lower end of the outboard side (the outboard wall of the side is in a tilted state) of the passenger roller boat to the upper end; during welding, the ceramic lining 2 with the forming groove 21 is adhered to the back of the joint of the V-shaped outer groove 11, and the front surface of the V-shaped outer groove 11 (namely, the outer surface of the side shell plate 1) is supported by the water-cooled slide block 8 to be formed in the molten pool 91, so that the welding method of one-side welding and two-side forming is achieved.

The welding materials for single-side welding and double-side once forming gas-electric overhead welding of the inclined topside outer plate 1 comprise a flux-cored wire 621, a ceramic liner 2, carbon dioxide gas and the like.

(1) Ceramic liner 2 design: for inboard welding one shot forming of topside outer wall, guarantee the height and the width of inboard welding seam 9 of topside outer wall, to the design of appearance dimensions such as shaping groove 21 of ceramic liner: the width of the ceramic liner is 43mm, and the height of the ceramic liner is 10mm; the width of the forming groove 21 is 15mm, the depth of the arc is 1.8mm, and the outer bottom of the ceramic groove is surrounded and fixed by a 1mm iron sheet.

In order to ensure the quality of the gas electric overhead welding, the composition of the ceramic liner 2 is defined as follows: less than 0.05 percent of sulfur, less than 0.1 percent of phosphorus, less than or equal to 0.4 percent of moisture absorption rate of the ceramic liner, more than or equal to 1.75g/cm < 3 > of volume density, more than or equal to 83g/cm < 2 > of breaking strength, more than or equal to 20N/2.5cm of 180-degree stripping force and 1300 ℃ of refractoriness.

(2) Flux-cored wire: the outer wall of the side of the passenger roller ship is made of E-level high-strength hull structural steel, 3Y-level flux-cored wires 621 are needed to be used for ensuring the gas-electric overhead welding quality, and the components of the flux-cored wires 621 meet the following requirements: less than or equal to 0.05 percent of carbon, less than 0.004 percent of sulfur, less than 0.007 percent of phosphorus, less than or equal to 0.90 percent of silicon, less than or equal to 2.0 percent of manganese, less than or equal to 0.35 percent of copper, less than or equal to 0.30 percent of nickel, less than or equal to 0.35 percent of molybdenum and less than or equal to 0.08 percent of vanadium.

(3) CO2 gas: the purity of the CO2 gas must be more than 99.9 percent.

In the preferred embodiment, the angle of inclination of welding wire 621 relative to the horizontal is 3-6 ° or 4-5 ° less than the angle of inclination of the centerline of V-shaped outer groove 11 relative to the horizontal during welding; the inclination angle of the central line of the V-shaped outer groove 11 relative to the horizontal plane is more than or equal to 25 degrees.

In a preferred embodiment, the crawling track 5 comprises a magnetic attraction structure 51 and a flexible aluminum track 52, the magnetic attraction structure is fixedly connected with the flexible aluminum track 52, and the crawling track 5 is fixed on the outer side of the side shell 1 through the magnetic attraction structure 51.

Specifically, the welding equipment comprises a welding power supply, a welding trolley, a wire feeding mechanism, a circulating cooling water system, a guide rail, a water-cooling slide block 8 and the like.

(1) The welding power supply is selected from an XD600G special power supply which is suitable for the oblique-elevation gas-electric overhead welding characteristic.

(2) The welding tractor comprises an operation control box, a swing mechanism, a welding gun, a sliding block pressing frame and the like. The sliding block pressing frame is fixed at the back of the welding tractor, namely the reverse direction of the walking direction of the welding tractor.

(3) The wire feeder of the gas-electric overhead welding is matched with a wire feeder of a groove-shaped roller with the diameter of 1.6 mm.

(4) The guide rail is a side rack type aluminum flexible guide rail and is specially used for installing a welding trolley, the length of each guide rail is 2.0m, and six groups of magnetic heaters are arranged and fixedly absorbed on a welded workpiece.

(5) The circulating cooling water system is mainly used for water cooling of the water-cooled slide block 8.

(6) Designing a water-cooling slide block 8:

the water-cooling slide block 8 is arranged on the slide block pressing frame (the maximum fastening pressure is 19 Kg), and the water-cooling slide block 8 is ensured to cling to the surface of the welding seam to move upwards along with the upward movement of the welding trolley, so as to support the molten pool 91 and force the welding seam 9 to be formed. The specification of the water-cooling slide block 8 selects a planar copper slide block with a groove width (the groove width should be 2 mm-4 mm wider than the size of the groove opening) and a groove depth of 1.8mm according to the size of the groove opening so as to support the molten pool 91 for forming.

Designing welding technological parameters: the single-side welding double-side one-step forming gas-electric overhead welding of the inclined-elevation outer plate can be performed by welding with an inclined elevation angle alpha larger than or equal to 25 degrees, and the welding process parameters mainly comprise: welding current, arc voltage, welding speed, welding wire 621 swing, welding wire 621 stick out length, gas flow, etc.

Welding current: when the outboard plate is gas-electric overhead welding, the current density is high, the current exceeds the critical current value of the common CO2 welding short circuit transition, and the molten drop shows a drop transition pattern. Its advantages are less spatter, stable arc combustion and high deposition speed, so it is necessary to select proper current. Too large and too small welding currents affect the stability of the welding process and the good formation of the weld bead.

Arc voltage: the selected value of the arc voltage needs to be matched with the welding current, under the condition that other standard parameters are not changed, the arc voltage is increased, the width of the welding seam 9 is increased, and the welding seam 9 undercut can occur in overhigh arc voltage. However, too low an arc voltage may cause arc burning instability. Therefore, it is advantageous to minimize the arc voltage to prevent porosity and to reduce the burning of alloying elements while ensuring a stable welding process and a good formation of the weld 9.

Welding speed: the appropriate welding speed depends on the melting speed of the welding wire 621. The relation between the melting speed of the welding wire 621 and the molten liquid level of the molten pool 91 in the water-cooling slide block 8 is preferably 5 mm-10 mm from the bottom of the air inlet 622. When the welding speed is too high, the metal liquid level of the molten pool 91 in the slide block gradually falls, the extending length of the welding wire 621 is increased, and the welding seam 9 is easy to generate air holes. When the welding speed is too slow, the metal liquid level of the molten pool 91 in the water-cooling slide block 8 rises, the splashing is increased, and when the metal liquid level of the molten pool 91 rises to the bottom of the air inlet 622, the arc combustion is unstable. And can even force the welding process to be interrupted.

Amplitude of welding wire 621: when the oblique overhead welding (the welding seam formed by the invention extends outwards and upwards, so the welding seam is called as the oblique overhead welding), the arc is stable, the splashing is small, the temperature on the section of the welding seam 9 is uniform, the metal crystallization state of the molten pool 91 is improved, the grain size is fine, and the compact welding seam 9 can be obtained. The swing amplitude is 4-8 mm, the stay time of the liner surface is 0.4-0.5 sec, and the stay time of the front surface of the V groove is 0.5-0.6 sec.

Welding wire 621 protrusion length: the extending length of the welding wire 621 which is obliquely overhead welding is 30 mm-35 mm. The welding wire 621 is too long in extension length, resistance heat is increased, melting speed is high, overheating and burning-out are easy to occur, severe splashing and poor protection effect are caused, stability of a welding process is affected, and forming deformation of a welding seam 9 is poor. The welding wire 621 is too short in extension length, which easily causes the blockage of the gas outlet of the shielding gas, and causes poor protection to affect the welding quality.

Gas flow rate: the passenger roller ship side carrying oblique overhead gas electric overhead welding belongs to external field operation, the CO2 gas flow is 30L/min, and the defects of electric arc stability in the welding process, welding air holes and the like can be directly influenced by overlarge and undersize gas flow.

And (3) welding operation: 1) Mounting the ceramic liner 2: when the ceramic liner 2 is installed, the centers of the forming groove 21 and the V-shaped outer groove 11 are required to be consistent, the ceramic liner 2 is tightly pushed without a gap, the ceramic liner 2 is tightly attached to the back of the steel plate, and the ceramic liner 2 is fixed by a fixing wedge 3 and is pressed into a gap between the fixing wedge 3 and the clamping plate 4.

Auxiliary trolley guide rail installation: a parallel line close to the edge of the V-shaped outer groove is drawn out before the trolley guide rail is installed, and the trolley climbing line is ensured to be basically parallel to the central line of the welding line 9.

Auxiliary trolley installation: and hanging the auxiliary welding trolley on a crawling track according to an operation procedure, and crawling for a section from bottom to top.

Installing a welding gun: the welding gun is fixed on the welding gun support on the trolley, then the trolley creeps upwards (quickly) from the lower end, and whether all welding wires 621 sent out from the welding gun are aligned with the center of the welding seam 9 is checked. If deviation exists, the guide rail is adjusted in place before welding, and a welding gun of the guide rail inclines downwards (from the surface of a plate) by 4-5 degrees.

In a preferred embodiment, the welding device 6 further comprises a slider pressing frame and a water-cooling slider, the slider pressing frame is fixed at the rear end of the moving mechanism 61, the water-cooling slider is fixed on the slider pressing frame, and the water-cooling slider 8 is used for pressing the welding seam 9 formed by the welding machine 62; the water-cooling sliding block 8 is provided with a water inlet 81 and a water outlet 82, the water-cooling sliding block 8 is fixed on the moving mechanism 61, and at least part of the water-cooling sliding block 8 is overlapped with the free end of the welding wire 621 in the vertical direction.

And (3) mounting a water-cooling sliding block 8: the water-cooling slide block 8 is placed on the slide block pressing frame (the maximum fastening pressure is 19 Kg), and along with the upward movement of the welding trolley, the water-cooling slide block 8 clings to the surface of the groove to move upward, so as to support the molten pool 91 to force the forming of the welding seam 9 of the gas-electricity overhead welding.

Arcing: after the arc voltage potentiometer, the welding current potentiometer and the welding wire 621 extension length control potentiometer are all adjusted to preset positions, a starting button is pressed to start arc striking in an arc breaking mode, and after a molten pool 91 is established, the welding wire 621 swings the button to start normal welding.

During the welding process, the heat distribution of the welding wire 621 centering and the welding seam 9 is observed at any time, and welding parameters are corrected to keep the surface of the welding molten pool 91 in a roughly horizontal state. The molten pool 91 is adjusted to the position 2-6mm away from the protective gas of the slide block by welding parameters at any time, and meanwhile, the insulating rod is used for removing splashes in the protective gas box of the water-cooling slide block 8 at any time.

When the welding is stopped, the auxiliary trolley stop button and the swing stop button are pressed to stop the feeding of the trolley and the welding wire 621 and extinguish the electric arc. After the molten pool 91 is solidified, the water-cooling slide block 8 is released, the splashes on the water-cooling slide block are removed, and the welding gun is taken down from the bracket.

In the preferred embodiment, the weld joint 9 has a weld surface that is at an acute angle to the centerline of the V-shaped outer groove 11, a weld pool 91 is formed on the weld surface, and the molten wire 621 is located within the weld pool 91.

After the welding is finished by adopting the method, the welding result is checked

5) And (3) welding inspection:

after welding, welding inspection, inspection and performance measurement are carried out according to welding and materials of classification society, and the welding inspection, inspection and performance measurement are all qualified, and the method comprises the following steps:

(1) visual inspection showed that the weld bead 9 was well formed on both sides, no weld defects were found, the visual inspection was acceptable, and the weld bead was subjected to 100% UT and 10% RT nondestructive testing 24 hours after welding, and the results were acceptable.

(2) And (3) impact test: after 100% nondestructive testing, 20 ℃ impact toughness tests are carried out on the center of a single-side welding double-side once-forming gas-electric overhead welding line, a fusion line +2 and a fusion line +5 of the inclined-overhead outer plate, and the test data are shown in the following table, so that the impact requirement standard of the minimum value of 34J specified by classification society is met.

(3) Tensile and bending test of weld 9: the transverse tensile test was performed on the weld joint 9, and the test results showed that the fracture positions were all on the base metal side, and the data are shown in the following table. The bend used in the bending test has the diameter of 40mm and the bending angle of 180 degrees, and the result shows that the bending test result is qualified.

Transverse tensile test of weld 9:

serial number	Tensile strength R _m /MPa	Location of fracture
			Sample No. 1	564	Base material
Sample No. 2	562	Base material

(4) And (3) hardness test: the hardness test part is shown in FIGS. 11 and 12, and the measured values are shown in the following table, and the maximum value is HV216, and the requirement that the maximum value of the classification society specification does not exceed HV350 is satisfied.

HV10 hardness test results:

(5) macroscopic metallographic test: macroscopic examination of the joint cross-section of the weld 9 revealed no visible weld defects, as shown in fig. 12.

Compared with the prior art, the novel method has the following advantages:

1. the welding line solves the problems that the climbing welding sight is blocked and the operation posture is difficult due to the closed narrow space at the inboard side of the outboard plate 1 of the luxury passenger and rolling ship and a plurality of strong structures, pipe systems and the like, and the inclined gas-electric overhead welding technology realizes the mechanized welding of the outboard plate and effectively improves the welding efficiency and the welding quality.

2. The problem of the inboard 10m3 less than airtight narrow space of inboard, the inboard butt joint need carry out multilayer multichannel welding operation, and it is abominable to produce a large amount of welding smoke and dust in the interior environment of circling round that the air does not convect is solved, and the oblique gas electric overhead welding technique is two-sided once-through of welding, has avoided the broadside slope planking to adopt the multilayer multiple pass welding that manual CO2 welding carried out and has aroused the welding defect.

3. The method solves the problems that the welding line 9 of the outer plate is poor or has welding defects due to the obstacles of a plurality of strong structures, piping systems and the like and the welding sight and the operation posture are blocked, the welding needs to be processed by a method of carbon arc air gouging back chipping and opening a U-shaped groove on the side outer plate 1, and the efficiency needs to be improved.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, reference to the description of the terms "preferred embodiment," "yet another embodiment," "other embodiments," or "specific examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. A welding method for carrying a side outer plate is characterized by comprising the following steps:

arranging a V-shaped outer groove on the adjacent side outer plate;

fixing a ceramic liner on the inner side of the side shell plate;

filling the V-shaped outer groove with a molten welding wire to form a weld joint on the outer side of the side shell plate, and welding and fixing the adjacent side shell plates;

wherein the side outer plate is inclined outward.

2. The welding method for assembling and welding an outboard ship board according to claim 1, wherein the angle of the groove on the outer side of the V-shape is 20 to 24 ° and the gap between the grooves is 8 to 12mm.

3. The welding method for assembling and welding the outboard side plate according to claim 1, wherein a forming groove is formed in the ceramic liner, the forming groove is arc-shaped, the maximum depth of the forming groove is 1mm to 2.5mm or 1.8mm to 2mm, the ceramic liner comprises a plurality of unit ceramic liners, the unit ceramic liners extend along the length direction of the V-shaped outer groove, and the unit ceramic liners are sequentially connected end to end.

4. A welding method for mounting a side shell according to claim 3, wherein said fixing of said ceramic liner comprises the steps of:

taking a fixing wedge, and driving the fixer into the unit ceramic liner and the code clamping plate through external force to enable the ceramic liner to be attached to the inner wall of the shipboard outer plate;

5. The assembling and welding method carried by the outboard plate according to claim 1, wherein a creeping rail is fixed to an outer side of the outboard plate, the creeping rail extends along the V-shaped outer groove, and a welding device is provided on the creeping rail and slides along the creeping rail; the welding equipment comprises a moving mechanism and a welding machine, wherein the welding machine is fixed on the moving mechanism and comprises a welding gun, and a welding wire is arranged on the welding gun.

6. The welding method for assembling and welding an outboard shell plate according to claim 5, wherein an inclination angle of the welding wire with respect to the horizontal plane is smaller by 3 to 6 ° or 4 to 5 ° than an inclination angle of a centerline of the V-shaped outer groove with respect to the horizontal plane during welding; the inclination angle of the center line of the V-shaped outer groove relative to the horizontal plane is more than or equal to 25 degrees.

7. The assembling and welding method for carrying the outboard planking as claimed in claim 5, wherein said crawling track comprises a magnetic attraction structure and a flexible aluminum track, said magnetic attraction structure is fixedly connected with said flexible aluminum track, and said crawling track is fixed on the outboard of said outboard planking through said magnetic attraction structure.

8. The assembling and welding method carried by the side shell plate according to claim 5, wherein the welding equipment further comprises a slide block pressing frame and a water-cooling slide block, the slide block pressing frame is fixed at the rear end of the moving mechanism, the water-cooling slide block is fixed on the slide block pressing frame, and the water-cooling slide block is used for pressing a welding seam;

9. A welding method for a board-side outer according to any one of claims 1 to 8, wherein a welding surface of the weld is at an acute angle to a center line of the V-shaped outer groove, a molten pool is formed on the welding surface, and the molten welding wire is positioned in the molten pool.