Box cabin hatch coaming welding tool and welding method

Abstract

The box cabin hatch coaming welding tool comprises a welding track, a track support and clamping devices, the track support comprises a track base and supporting seats, the welding track is arranged on one side of the track base, the supporting seats are arranged on the other side of the track base and arranged at the two ends of the track base, the clamping devices are arranged on the supporting seats, and the clamping devices are arranged on the supporting seats. The fixing device is used for fixing the welding rail. Meanwhile, the invention provides a box cabin hatch coaming welding method which comprises the steps that grooves are formed in a box cabin hatch coaming, a first groove and a second groove are formed, and the groove angle of the first groove is different from that of the second groove; the groove is fixed; preheating the groove; and the first groove is welded in a first welding mode, and the second groove is welded in a second welding mode. By means of the box cabin hatch coaming welding tool and method, the welding efficiency and the welding quality are effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of ship welding, and in particular relates to the improvement and innovation of welding tooling and welding methods carried by a hatch coaming thick plate flat butt joint assembly during the construction of a large container ship. Background Art

[0002] In the construction of ultra-large container ships, due to the problem of large container ships being prone to fracture accidents, higher and higher requirements are placed on the thickness and strength of the hull steel plates. Ultra-large container ships use high-strength, high-toughness ultra-thick EH47BCA1 ultra-high-strength crack arrest steel in the "Π"-shaped hatch coaming, torsion box and middle main deck, especially the hatch coaming deck thickness of more than 80mm. The "Π"-shaped hatch coaming of large container ships is welded by multi-layer and multi-pass filling and covering methods, and the qualified rate of post-weld non-destructive testing is low, and welding defects such as lack of fusion or lack of penetration are prone to occur. Summary of the invention

[0003] The embodiment of the present invention provides a welding tool and a welding method for the hatch coaming of a container ship. In view of the characteristics of ultra-high strength crack arrest steel that spot welding and burning of tooling codes are not allowed, a submerged arc automatic welding device for a "Π"-shaped hatch coaming deck is developed, and an innovative track tool for submerged arc welding walking rails is improved to realize the automatic welding of the "Π"-shaped hatch coaming deck.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a container ship hatch coaming welding tool, comprising a welding track, a track bracket, and a clamp, wherein the track bracket comprises a track base and a support seat, the welding track is arranged on one side of the track base, and the support seat is arranged on the other side of the track base and at both ends of the track base; the clamp is arranged on the support seat for fixing the welding track.

[0005] Furthermore, the welding track includes a limiting device, and the limiting device is arranged at both ends of the welding track.

[0006] Furthermore, the welding tracks are arranged at intervals, and a first connecting piece is included between the welding tracks.

[0007] Furthermore, the support seat includes a first plane and a second plane, and the welding track is connected to the first plane via a first connecting member.

[0008] Furthermore, the clamp is arranged on the second plane of the support seat.

[0009] The present invention further provides a method for welding a hatch coaming of a container ship, the steps of which are:

[0010] (1) a container ship hatch coaming is provided with a bevel to form a first bevel and a second bevel, wherein the bevel angle of the first bevel is different from the bevel angle of the second bevel;

[0011] (2) fixing the groove;

[0012] (3) preheating the groove;

[0013] (4) The first groove is welded by a first welding method, and the second groove is welded by a second welding method.

[0014] Furthermore, the first groove is a lower groove with a groove angle of 30°, and the second groove is a face groove with a groove angle of 70°.

[0015] Furthermore, the preheating temperature of the groove is 125°C to 180°C.

[0016] Further, the range of preheating the groove is within 100 mm from the groove edge on both sides of the groove.

[0017] Furthermore, the first welding method is swing submerged arc FAB welding, the welding wire extends to a length of 20 to 25 mm and is aligned with the center of the weld.

[0018] Furthermore, the wire swing width of FAB welding is 1-2 mm smaller than the groove gap, and the swing speed is 250-270 mm / min.

[0019] Furthermore, the second welding method is submerged arc automatic welding without swinging.

[0020] This invention aims at the characteristics of the "Π"-shaped hatch coaming deck of large container ships, such as the 10mm free edge of the panel and the EH47BCA1 ultra-high-strength crack-arresting steel on the web, which does not allow spot welding and burning of the tooling code. It solves the welding tooling and welding method carried by the hatch coaming thick plate assembly, develops a "Π"-shaped hatch coaming deck submerged arc automatic welding device, innovatively improves the track tooling of the submerged arc welding walking track, and realizes the automatic welding of the "Π"-shaped hatch coaming deck; and optimizes and improves the V-shaped groove of the hatch coaming deck to an innovation of a stepped V-shaped groove, and innovates a welding method for surfacing the 80mm thick plate to a 16mm plate, develops a swing submerged arc FAB welding base welding and submerged arc automatic welding filling and covering welding method, innovatively improves the stepped V-shaped groove, solves the implementation of the thick plate swing submerged arc FAB welding base welding technology, obtains high-quality single-sided welding and double-sided forming, reduces the occurrence of welding defects such as incomplete fusion or incomplete penetration, improves the operation quality and improves the operation efficiency.

[0021] Compared with the prior art, this new method has the following advantages:

[0022] 1. The innovative submerged arc welding walking track device solves the problem that the free edge of the hatch coaming deck panel is 10mm, the web EH47BCA1 ultra-high strength crack arrest steel does not allow spot welding and burning of tooling codes, and efficient automated welding cannot be applied. The carbon dioxide semi-automatic welding has 94 welding passes and a large welding workload. The welding technology of the "Π"-shaped hatch coaming deck achieves 64 automatic welding passes, which is 1 / 3 less, effectively improving welding efficiency and welding quality.

[0023] 2. Innovative stepped V-shaped groove is adopted to change the 80mm thick plate of the hatch coaming deck into a 16mm plate welding and upward surfacing welding method, which effectively reduces the difficulty of welding operation, avoids the occurrence of incomplete fusion and slag inclusion defects in carbon dioxide welding of thick plates, and improves welding quality.

[0024] 3. The V-shaped groove of the hatch coaming deck is optimized and improved into a stepped V-shaped groove, and a swing submerged arc FAB welding primer is developed to solve the problem that the V-shaped groove angle of the 80mm thick deck of the "Π"-shaped hatch coaming is relatively small when the carbon dioxide semi-automatic welding is used. The root primer welding of the carbon dioxide welding is prone to defects such as lack of fusion or lack of penetration. The post-welding TOFD+UT+MT100% non-destructive testing has a 100% pass rate in one test, avoiding the risk of 80mm thick crack arrest steel plates being repaired more than twice and having to replace steel plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram showing a hatch coaming welding tool for a container ship according to an embodiment of the present invention;

[0026] Figure 2 A top view showing a welding track of a container ship hatch coaming welding tool according to an embodiment of the present invention;

[0027] Figure 3 A cross-sectional view showing a welding track of a container ship hatch coaming welding tool according to an embodiment of the present invention;

[0028] Figure 4 A schematic diagram showing a support base of a container ship hatch coaming welding tooling according to an embodiment of the present invention;

[0029] Figure 5 A schematic diagram showing a clamp of a container ship hatch coaming welding tool according to an embodiment of the present invention;

[0030] Figure 6 A schematic diagram showing a design of a bevel of a hatch coaming deck of a container ship according to an embodiment of the present invention;

[0031] Figure 7 A schematic diagram showing the assembly of a hatch coaming deck groove of a container ship according to an embodiment of the present invention;

[0032] Figure 8A schematic diagram showing a preheating range of a hatch coaming deck groove of a container ship according to an embodiment of the present invention;

[0033] Fig. 9 A schematic diagram showing the laying of a filling wire fragment according to an embodiment of the present invention;

[0034] Fig.10 A schematic diagram showing the extension length of a welding wire according to an embodiment of the present invention;

[0035] Figure numerals: 1-welding tool; 2-deck to be welded; 3-welding trolley; 11-welding track; 12-track bracket; 13-clamp, 14-support seat; 15-track base; 16-limiting device; 17-first connecting piece; 18-first plane; 19-second plane. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the construction of ultra-large container ships, due to the problem that large container ships are prone to fracture accidents, higher and higher requirements are placed on the thickness and strength of the hull steel plates. Ultra-large container ships use high-strength, high-toughness, ultra-thick EH47BCA1 ultra-high-strength crack-arresting steel in the "Π"-shaped hatch coaming, torsion boxes and the middle main deck, especially the hatch coaming deck thickness of more than 80mm.

[0038] The traditional process for butt jointing of hatch coamings at the stage of ship assembly is to assemble the V-shaped groove at a 32° angle. The welding method is as follows:

[0039] a) The V-shaped groove of the steel plate of the hatch coaming block deck EH47BCA1 is preheated by electric heating of the ceramic pad on the front side. The preheating temperature within 100mm on both sides of the groove is 120℃≤T≤180℃.

[0040] b) A ceramic liner is attached to the back of the V-shaped groove and the base welding is performed using carbon dioxide semi-automatic welding.

[0041] c) After the carbon dioxide semi-automatic welding, multi-layer and multi-pass filling and covering welding is carried out.

[0042] The V-shaped groove welding of the EH47BCA1 ultra-high strength crack arrest steel for the 80mm thick deck of the "Π"-shaped hatch coaming of large container ships adopts the CO2 semi-automatic welding for the base welding, followed by the multi-layer and multi-pass filling and covering welding method. The qualified rate of the post-welding TOFD+UT+MT100% non-destructive testing is low. The existing technology has the following problems:

[0043] 1. Since the “Π”-shaped hatch coaming and torsion box are manufactured in sections and then assembled, the overall assembly is carried out at high altitude. The free edge of the panel of the “Π”-shaped hatch coaming deck is 10 mm, and the web EH47BCA1 ultra-high strength crack arrest steel does not allow spot welding and burning of tooling codes, so efficient automated welding cannot be applied, and the welding efficiency and quality need to be improved.

[0044] 2. As the deck thickness of the "Π"-shaped hatch coaming is 80mm, the V-shaped groove angle of 32° is relatively small when using CO2 semi-automatic welding. The welding gun at the root of the groove is difficult to swing, and the welding temperature dissipates quickly. The welding cooling speed is too fast, and the tendency of cold cracks is relatively large. At the same time, CO2 welding is prone to welding defects such as lack of fusion or lack of penetration.

[0045] 3. The 80mm thick deck of the "Π"-shaped hatch coaming is welded with carbon dioxide semi-automatic welding for base welding and multi-layer and multi-pass filling and covering welding. The welding workload is large, and the number of carbon dioxide semi-automatic welding passes reaches 94. The number of welding layers is relatively large, which has higher requirements for welding operation skills. During welding, unreasonable arrangement of welds is prone to occur, resulting in sharp angles between welds or between welds and grooves. In the subsequent weld welding, the deeper sharp angles cannot be melted, resulting in the formation of welding incomplete fusion and slag inclusion defects. There is a risk of EH47BCA1 crack arrest steel being repaired more than twice and replacing steel plates.

[0046] like Figure 1 , which is a schematic diagram of a welding tool for a hatch coaming of a container ship. The welding tool 1 is installed on a deck 2 to be welded, and a welding carriage 3 is installed on the welding tool 1. The welding carriage 3 moves on the welding tool to achieve welding of the deck 2.

[0047] The welding track is arranged on one side of the track base, the support seat is arranged on the other side of the track base and at both ends of the track base, and the clamp is arranged on the support seat for fixing the welding track.

[0048] like Figure 2 and Figure 3 As shown, Figure 2 A top view showing a welding track of a container ship hatch coaming welding tool according to an embodiment of the present invention, Figure 3A cross-sectional view of a welding track of a container ship hatch coaming welding tool according to an embodiment of the present invention is shown. Specifically, the welding tool 1 includes a welding track 11, a track bracket 12 and a clamp 13. The track bracket 12 includes a support seat 14 and a track base 15, the welding track 11 is arranged on the track base 15, and the track base 15 is arranged on the support seat 14. The clamp 13 is arranged on the track bracket to fix the welding tool on the deck.

[0049] According to the width of the hatch coaming deck of a large container ship of 800mm, in order to realize the submerged arc automatic welding of the hatch coaming deck, the welding track 11 includes a welding section and a blind walking section arranged at both ends of the welding section. As shown in the figure, the length of the welding machine track 11 is designed to be 1820mm, and 510mm is added at both ends on the basis of the deck width of 800mm as the blind walking section of the welding trolley, ensuring that the deck width of 800mm can be welded by submerged arc welding, and there is no blind welding at both ends. The welding machine track 11 uses two L30*30*3mm equilateral angle steels with right angle vertices as the guide rails of the welding trolley.

[0050] Furthermore, the welding track includes a limit device, which is arranged at both ends of the welding track. Figure 2 As shown, at both ends of each welded track, a limiting device 16 is provided. The limiting device 16 can be a steel plate welded to both ends of the track.

[0051] In another embodiment, the limiting devices are arranged at both ends of the track base. The limiting devices are arranged at both ends of each track base connected to the welding track.

[0052] like Figure 3 As shown, the welding track 11 is arranged on the track base 15, which is used to support the welding track 11. The track base 15 is two 1820mm long flat steels of δ6*50*1820mm. The welding track 11 and the track base 15 are connected and welded to the right angles of the equal angle steel at both ends. The welding track 11 and the track base 15 are welded in an intermittent welding manner to ensure sufficient strength of the equal angle steel and control welding deformation.

[0053] Furthermore, if Figure 3 As shown, the welding rails are arranged at intervals, and the welding rails include a first connecting member 17, and the function of the first connecting member 17 can include connecting the two rails 11. Specifically, the first connecting member 17 is a flat steel, which is connected to the rail base 15, for example, by welding. According to the center width of the groove of the welding small wheel 300mm as the width of the guide rail, δ6*50*250mm flat steel is used to be welded and fixed at both ends and the middle of the guide rail in five grids.

[0054] Furthermore, the first connecting member can be used to connect the support seat. A connecting hole or a threaded hole is provided on the first connecting member, and a connecting hole or a threaded hole is also provided at a corresponding position of the support seat. The welding track and the support seat can be connected through the first connecting member by bolts or screws. At the same time, since the welding track and the support seat are detachably connected by bolts or screws, the welding track and the support seat can be quickly installed and removed.

[0055] like Figure 4 As shown, Figure 4 A schematic diagram of a support seat of a container ship hatch coaming welding tooling according to an embodiment of the present invention is shown. The support seat 14 is arranged below the track base 15 and is located at both ends of the track base. The support seat 14 is connected by a support tripod. The support tripod is welded by three L45*4mm equilateral angle steels, with L45*4*500mm equilateral angle steels as horizontal planes, L45*4*450mm as vertical sides, and L45*4*595mm equilateral angle steels as bevel sides. Among them, the two ends of the L45*4*500mm horizontal planes of the two support tripods are fixedly connected to the welding track 11, for example, by welding. The two ends of the horizontal planes of the two support tripods are respectively welded by two 250mm long L45*4*250mm equilateral angle steels. The lower ends of the vertical sides of the two support tripods are welded by a 250mm long L45*4*250mm equilateral angle steel.

[0056] Furthermore, the support seat includes a first plane and a second plane. Specifically, Figure 4 The support seat 14 includes a first plane 18 and a second plane 19 as shown in the figure. When the tool is used, the first plane 18 can be a horizontal plane, that is, the plane on which the welding trolley travels. The second plane 19 is the plane where the vertical side of the supporting tripod is located, that is, the plane that cooperates with the deck to be fixed. The first plane and the second plane can be perpendicular to each other.

[0057] The welding track is arranged on the first plane, for example, the welding track can be connected to the first plane of the support seat through the track base and the first connecting member. Specifically, a hole is opened on the first plane, and the welding track is fastened to the first connecting member through screws.

[0058] like Figure 5 As shown, Figure 5 A schematic diagram showing a clamp of a container ship hatch coaming welding tooling according to an embodiment of the present invention. The clamp 13 is a nut and a screw arranged on the second plane of the support base. Specifically, a hole is opened on the second plane, and an M20 nut is installed and welded to fix it. By installing an M20 screw, the support tripod is fixedly connected to the deck.

[0059] For the application of the clamp, first place the welding track at the welding position, and tighten the M20 screws on the vertical side angle steel of the supporting tripod at both ends of the welding track to the hatch coaming belly plate with an adjustable wrench to firmly fix the welding track to the hatch coaming and realize submerged arc welding. After welding, loosen the screws for easy moving and storage.

[0060] Another embodiment of the present invention is to develop a swing submerged arc FAB welding base welding and submerged arc automatic welding filling and capping welding method by optimizing and improving the bevel of the deck of the hatch coaming of a large container ship, so as to realize the function of automatic welding of ultra-thick plates. The specific steps of the invented method for welding thick plates of the hatch coaming of a large container ship are as follows:

[0061] (1) providing a bevel on the hatch coaming to form a first bevel and a second bevel, wherein the bevel angle of the first bevel is different from the bevel angle of the second bevel;

[0062] Specifically, Figure 6 The figure shows a schematic diagram of the design of the bevel of the hatch coaming deck of a container ship. The welding bevel of the 80mm thick deck of the hatch coaming is designed as a stepped V-shaped bevel, forming two different bevels in one bevel. The first bevel is the lower bevel with a bevel angle of 30°, and the second bevel is the face bevel with a bevel angle of 70°. The plate thickness of the first bevel is 16mm from the root upwards, and the plate thickness of the second face bevel is 64mm, forming an innovative welding method of changing the 80mm thick plate into a 16mm plate for upward surfacing.

[0063] (2) Fixed bevel.

[0064] Specifically, Figure 7 The figure shows the assembly diagram of the welding groove of the hatch coaming 80mm thick deck. After the welding groove of the hatch coaming 80mm thick deck is opened, the assembly gap is 6-8mm, the blunt edge is 0-1mm, and it is fixed with a positioning card plate. The code plate must be installed on the back of the groove. In order to facilitate the continuous operation of submerged arc welding, arc-initiating and extinguishing plates are installed at both ends of the groove. The specifications are not less than 100*120mm (120mm is the width direction). The groove surface and the area within 30mm from the groove edge are grinded, rusted and degreased with grinding wheels.

[0065] (3) Preheat the groove.

[0066] The carbon equivalent of EH47BCA1 crack arrest steel is higher than that of ordinary high-strength steel. The weldability of high-carbon equivalent steel plates is poor, which increases the difficulty of welding. At the same time, thick plate welding has a greater tendency to produce cold cracks due to the rapid cooling speed of welding. It is necessary to strictly control the preheating before welding and the interlayer temperature. The preheating temperature needs to comprehensively consider factors such as the chemical composition, thickness, constraint degree of the joint and welding environment temperature of the parent material. The temperature of the root of the groove is more uniform, and the heating preheating is improved to uniform electric heating plate preheating within 100mm on both sides of the front and back of the groove. The preheating temperature is 125℃~180℃, and the preheating temperature is measured with a temperature gun at a position 76mm away from the edge of the groove.

[0067] (4) The first groove is welded using a first welding method, and the second groove is welded using a second welding method.

[0068] Specifically, the first groove is welded using the first welding method. The hatch coaming 80mm thick deck welding groove is opened with a stepped V-shaped groove, the first lower groove is 16mm thick and has a groove angle of 30°, the 80mm thick plate is changed to a 16mm plate for welding, and the swing submerged arc FAB welding method is used. Through the swing mode FAB welding primer, the center temperature of the molten pool is improved, the temperature of the groove root is made more uniform, and high-quality single-sided welding and double-sided forming are obtained. The steps are as follows:

[0069] 1) Welding materials: VY46MH5 grade welding materials are used, and the equal strength matching principle of ordinary steel plate welding wire is abandoned, and low strength matching is adopted, that is, welding materials are selected according to the principle that the weld strength level is lower than that of the parent material. The welding wire is H-14, Φ4mm, the filler is CW (crushed iron wire), the flux is SC-460Y, and the ceramic fiber liner is TG-1.80Z. The flux needs to be dried at 350-400℃ before use.

[0070] 2) Stick a ceramic fiber gasket (TG-1.80Z model) on the back of the groove. The center line of the groove weld should be aligned with the center line of the ceramic fiber gasket. Scrape the surface of the aluminum foil tape on both sides of the gasket flat so that the tape is firmly attached to the base material. There should be no gap between the gaskets.

[0071] 3) Then fill the broken welding wire (CW model) and evenly sprinkle the broken welding wire (CW diameter Ф1.0*1.0mm) in the stepped V-shaped groove. The thickness of the broken welding wire is the same as the thickness of the first lower groove to be welded, 16mm.

[0072] 4) Welding process parameters: Use swing submerged arc FAB welding, the wire extension length is 20 to 25 mm, and it is aligned with the center of the weld. Fig. 9 As shown in the schematic diagram.

[0073] Since the stepped V-shaped groove of the 80mm thick deck of the hatch coaming is relatively thick, preheating treatment is required before welding. Preheating is performed within 100mm on both sides of the groove. The preheating temperature is 125℃~180℃ to facilitate the escape of diffused hydrogen and avoid the generation of hydrogen-induced cracks. The swing width of the FAB welding wire is 1~2mm less than the groove gap, and the swing speed is 250~270mm / min. Through the swing mode FAB welding, the center temperature of the base welding pool is improved, the temperature of the groove root is more uniform, and the generation of welding defects such as incomplete fusion or incomplete penetration is reduced. The welding current and voltage parameters are shown in the table below.

[0074] First groove welding parameters

[0075]

[0076] Furthermore, a second welding method is used to weld the second groove. Specifically, the filling layer and cover layer welding adopts a multi-layer and multi-pass welding technology of a submerged arc automatic welding non-swinging welding method, which can effectively reduce welding heat input, thereby effectively controlling welding deformation and welding stress. The width of each weld in the multi-layer and multi-pass welding is controlled within the range of 25 mm, and each weld covers about 1 / 2 of the previous weld, and the previous weld can be heat treated to reduce the coarse-grained structure in the weld, refine the grains, and meet the requirements of the CTOD (crack tip opening displacement) value of the welded joint.

[0077] 1) Welding materials: welding wire H-14, Φ4mm, flux S-707T, the flux needs to be dried at 350-400℃.

[0078] 2) Weld bead design: The filling layer and the cover layer are welded in separate passes. The last weld is used as the cover weld and is an annealing weld. It should be arranged at a distance of 1 to 2 mm from the base material.

[0079] 3) Layout design of welding gun: The dry extension length of welding wire is 25-35mm. Each welding wire is aligned with the edge of the previous weld, and each welding wire covers about 1 / 2 of the previous weld. Fig.10 As shown in the schematic diagram.

[0080] 4) Welding parameters: The process parameters of filling cap welding submerged arc welding are shown in the table below. During the welding process, the interlayer temperature should be controlled between the minimum preheating temperature and 200°C.

[0081] Second groove welding parameters

[0082] Weld layer Welding methods Welding wire specification / mm Current / A Voltage / V Speed / (m / h) Filling layer SAW Φ4.0 626～750 31～35 19～32 Covering layer SAW Φ4.0 635～750 31～35 19.1～32

[0083] 5) Slow cooling after welding: After welding is completed, use insulation cotton to wrap the weld area to slow down the cooling rate of the weld, reduce the hardenability of the weld, avoid cracks caused by rapid cooling of the weld, and ensure the mechanical properties of the weld.

[0084] 6) Welding inspection:

[0085] After welding was completed, welding inspection, examination and performance measurement were carried out in accordance with the classification society's "Welding and Materials". Visually, the front and back sides of the weld were well formed, no welding defects were found, and the appearance inspection was qualified. 100% UT+100% TOFD+100% MT non-destructive testing was carried out 48 hours after welding, and the results were qualified.

[0086] This invention aims at the characteristics of the 10mm free edge of the panel of the "Π"-shaped hatch coaming deck of large container ships, and the EH47BCA1 ultra-high strength crack arrest steel on the web, which does not allow spot welding and burning of tooling codes. It solves the welding tooling and welding method carried by the hatch coaming thick plate assembly, develops a "Π"-shaped hatch coaming deck submerged arc automatic welding device, and innovatively improves the track tooling of the submerged arc welding walking track to realize the automatic welding of the "Π"-shaped hatch coaming deck. The V-shaped groove of the hatch coaming deck is optimized and improved to a stepped V-shaped groove, and an innovative welding method of surfacing the 80mm thick plate to a 16mm plate is developed. A swing submerged arc FAB welding base welding and submerged arc automatic welding filling and covering welding method are developed, and the stepped V-shaped groove is innovatively improved to solve the realization of the swing submerged arc FAB welding base welding technology for thick plates, obtain high-quality single-sided welding and double-sided forming, reduce the generation of welding defects such as incomplete fusion or incomplete penetration, and improve the work quality and work efficiency.

[0087] Compared with the prior art, this new method has the following advantages:

[0088] 1. The innovative submerged arc welding walking track device solves the problem that the free edge of the hatch coaming deck panel is 10mm, the web EH47BCA1 ultra-high strength crack arrest steel does not allow spot welding and burning of tooling codes, and efficient automated welding cannot be applied. The CO2 semi-automatic welding has 94 welding passes and a heavy welding workload. The welding technology of the "Π"-shaped hatch coaming deck achieves 64 automatic welding passes, which is reduced by 1 / 3, effectively improving welding efficiency and welding quality.

[0089] 2. Innovative stepped V-shaped groove is used to change the 80mm thick plate of the hatch coaming deck into a 16mm plate welding + upward surfacing welding method, which effectively reduces the difficulty of welding operation, avoids the occurrence of incomplete fusion and slag inclusion defects in CO2 welding of thick plates, and improves welding quality.

[0090] 3. The V-shaped groove of the hatch coaming deck is optimized and improved into a stepped V-shaped groove. A swing submerged arc FAB welding primer welding is developed to solve the problem that the V-shaped groove angle of the 80mm thick deck of the "Π"-shaped hatch coaming is relatively small when the CO2 semi-automatic welding is used. The root primer welding of CO2 welding is prone to defects such as lack of fusion or lack of penetration. The post-welding TOFD+UT+MT100% non-destructive testing has a 100% pass rate in one test, avoiding the risk of 80mm thick crack arrest steel plates being repaired more than twice and having to replace steel plates.

[0091] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A container ship hatch coaming welding tool, comprising a welding track, a track bracket, and a clamp, wherein: The track bracket includes a track base and a support base, the welding track is arranged on one side of the track base, the support base is arranged on the other side of the track base and at both ends of the track base; the clamp is arranged on the support base for fixing the welding track.

2. A container ship hatch coaming welding tool as claimed in claim 1, wherein the welding track comprises a limit device, and the limit device is arranged at both ends of the welding track.

3. A container ship hatch coaming welding tool as claimed in claim 1, wherein the welding rails are arranged at intervals, and a first connecting piece is included between the welding rails.

4. A container ship hatch coaming welding tool as claimed in claims 1 and 3, wherein the support seat comprises a first plane, and the welding track is connected to the first plane via a first connecting member.

5. The container ship hatch coaming welding tool as claimed in claim 1, wherein the support seat comprises a second plane, and the clamp is arranged on the second plane of the support seat.

6. A method for welding the hatch coaming of a container ship, the steps of which are: (1) a container ship hatch coaming is provided with a bevel to form a first bevel and a second bevel, wherein the bevel angle of the first bevel is different from the bevel angle of the second bevel; (2) fixing the groove; (3) preheating the groove; (4) The first groove is welded by a first welding method, and the second groove is welded by a second welding method.

7. A method for welding a hatch coaming of a container ship as claimed in claim 6, wherein the first groove is a lower groove with a groove angle of 30°, and the second groove is a face groove with a groove angle of 70°.

8. A method for welding a hatch coaming of a container ship as claimed in claim 6, wherein the preheating temperature of the groove is 125°C to 180°C.

9. A method for welding a hatch coaming of a container ship as claimed in claim 6, wherein the range of preheating the groove is within 100 mm from the groove edge on both sides of the front and back sides of the groove.

10. A method for welding hatch coamings of a container ship as claimed in claim 6, wherein the first welding method is swing submerged arc FAB welding, the welding wire has a length of 20 to 25 mm and is aligned with the center of the weld.

Images