PW3 welder certificate duplicating device and method suitable for LNG (Liquefied Natural Gas) ship

Abstract

The invention discloses a PW3 welder certificate duplicating device suitable for an LNG ship, the device comprises a protection module, an operation platform and a fixing module, the operation platform is installed above the protection module, the fixing module is arranged on the operation platform, a duplicating test plate is placed on the operation platform, the duplicating test plate is fixedly connected with the operation platform through the fixing module, and the fixing module is used for fixing the duplicating test plate. The protection module comprises a base and an enclosure bulkhead, the base is arranged at the lower end of the enclosure bulkhead and seals the lower end face of the enclosure bulkhead, the operation platform is installed on the upper end face of the enclosure bulkhead, a welding operation opening is formed in the middle of the operation platform, and fixing columns are symmetrically arranged on the two sides of the welding operation opening of the operation platform. A verification test plate is arranged between the fixing module and the operation platform. Through the arrangement of the operation platform and the fixing plate, the verification test plate can be rapidly and accurately fixed, meanwhile, it is guaranteed that a welding opening of the verification test plate is located on a welding operation opening, the welding efficiency is improved, the verification time is shortened, and the time occupied by actual ship production is greatly shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a device and method for recertifying a PW3 welder certificate suitable for LNG ships. Background Art

[0002] The construction of LNG ships is known as the jewel in the crown of the shipbuilding industry. The most important and complex part is the construction of liquid cargo tanks. The liquid cargo tanks of LNG ships are composed of two layers of insulation, each of which is composed of an insulation box and an invar membrane. The welding of the invar membrane is the most difficult part of the construction of the liquid cargo tank. On the one hand, the length of the weld of the liquid cargo tank is very long, and on the other hand, there are many types of welding involved in the liquid cargo tank. According to the GTT specifications, the manual welding certificates for liquid cargo tanks are: SP1...SP7, PW1...PW6. Each manual welding certificate needs to be recertified regularly as required. Therefore, for a welder team that builds a large N0,96 type containment system, there are a large number of recertification operations every year, and a large number of recertifications will undoubtedly occupy a large number of actual ship operations. According to GTT requirements, PW3 recertification requires welding 2 3mm invar plates for butt welding. In order to ensure the welding quality, the reverse side needs to be inflated for protection, which will delay a lot of time in the actual recertification. Summary of the invention

[0003] The object of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide a device and method for recertifying the PW3 welder certificate for LNG ships. The device and method of the present invention can quickly and accurately fix the recertification test plate through the setting of an operating platform and a fixing plate, while ensuring that the welding port of the recertification test plate is on the welding operating port, thereby improving the welding efficiency, shortening the recertification time, and greatly reducing the time occupied in actual ship production.

[0004] In order to achieve the above invention purpose, the technical solution provided by the present invention is as follows:

[0005] A PW3 welder certificate recertification device suitable for LNG ships, the device comprises a protection module, an operating platform and a fixing module, the operating platform is installed above the protection module, the fixing module is arranged on the operating platform, a recertification test plate is placed on the operating platform, the fixing module fixes the recertification test plate to the operating platform, the protection module comprises a base and a surrounding wall, the base is arranged at the lower end of the surrounding wall, the base seals the lower end surface of the surrounding wall, the operating platform is installed on the upper end surface of the surrounding wall, a welding operation port is arranged in the middle of the operating platform, fixing columns are symmetrically arranged on both sides of the welding operation port of the operating platform, the fixing module is connected to a fixed post, and a recertification test plate is arranged between the fixing module and the operating platform.

[0006] Furthermore, the surrounding wall is in a square shape as a whole, and air inlet holes and air outlet holes are symmetrically arranged on the side of the surrounding wall, and the end surface area of ​​the base is larger than the end surface area of ​​the opening at the bottom of the surrounding wall.

[0007] Furthermore, the operating platform is in the shape of a rectangular parallelepiped as a whole, the area of ​​the operating platform is larger than the area of ​​the upper opening end surface of the surrounding wall, the surrounding wall is sealed by the operating platform on all sides, the welding operation port is opened in the middle of the opening end surface of the surrounding wall, the fixed columns on both sides of the welding operation port are perpendicular to the operating platform, the width spacing between the two fixed columns arranged on one side of the welding operation port is larger than the width of the welding operation port, and the length spacing between the fixed columns on both sides of the welding operation port is larger than the length of the welding operation port.

[0008] Furthermore, the fixing module includes two fixing plates with the same structure, fixing grooves are provided at both ends of the fixing plates, the fixing plates are respectively installed on both sides of the welding operation port, fixing columns are inserted into the fixing grooves on both sides of the fixing plates, and the fixing plates are fixed by bolts.

[0009] Furthermore, the re-certification test board is a rectangular board as a whole, and clamping plates are arranged on both sides of the re-certification test board, and the clamping plates on both sides of the re-certification test board are installed between the fixing columns.

[0010] A method for recertifying a PW3 welder certificate for an LNG ship, the method specifically comprising the following steps:

[0011] S1. Prepare a PW3 welder certificate recertification device for LNG ships, the device comprising a protection module, an operating platform and a fixing module. The operating platform is installed above the protection module, the operating platform is provided with a fixing module, a recertification test plate is placed on the operating platform, the fixing module fixes the recertification test plate to the operating platform, the protection module comprises a base and a surrounding wall, the lower end of the surrounding wall is provided with a base, the base seals the lower end face of the surrounding wall, the operating platform is installed on the upper end face of the surrounding wall, a welding operation port is provided in the middle of the operating platform, and fixing columns are symmetrically provided on both sides of the welding operation port of the operating platform, the fixing module is connected to the fixing module, and a recertification test plate is provided between the fixing module and the operating platform;

[0012] S2, install the two re-certification test plates on the operating platform respectively, and install the clamping plates on both sides of the re-certification test plates between the fixed columns on both sides of the welding operation port respectively; the connection point of the two re-certification test plates is above the welding operation port;

[0013] S3, after the re-certification test plate is installed, install the fixing plate on the top of the re-certification test plate, insert the fixing columns on both sides of the welding operation port into the fixing grooves on both sides of the fixing plate, and fix them with bolts;

[0014] S4, after the fixing plate is installed, the air inlet hole of the surrounding wall is connected to the argon gas pipeline, and argon gas is filled into the surrounding wall through the argon gas pipeline;

[0015] S5, after the argon gas is filled into the enclosure for one minute, the welding of the re-certification test plate is started and the welding of the re-certification test plate is completed;

[0016] Furthermore, when the re-certification test plate is welded, the argon gas pipeline continuously fills the surrounding wall with argon gas, and when the re-certification test plate is welded and cooled, the filling of argon gas into the surrounding wall is stopped.

[0017] Furthermore, the distance between the fixing plates installed on both sides of the welding operation port is greater than 20 mm.

[0018] Based on the above technical solution, the present invention patented a device and method for recertifying PW3 welder certificates for LNG ships, which has achieved the following technical advantages through practical application:

[0019] 1. The present invention is suitable for a PW3 welder certificate recertification method for LNG ships. Through the setting of an operating platform and a fixing plate, the recertification test plate can be fixed quickly and accurately, and at the same time, the welding port of the recertification test plate is ensured to be on the welding operation port, thereby improving the welding efficiency, shortening the recertification time, and greatly reducing the time occupied in actual ship production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a structural diagram of a recertification device suitable for a PW3 welder certificate recertification device for an LNG ship.

[0021] Figure 2 The present invention is a structural diagram of a recertification test plate suitable for a PW3 welder certificate recertification device for an LNG ship.

[0022] Figure 3 The present invention is a structural diagram of the use of a recertification device suitable for a PW3 welder certificate recertification device for an LNG ship. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0024] like Figure 1-3The present invention belongs to a device for recertifying a PW3 welder certificate for an LNG ship, the device comprising a protection module, an operating platform 2 and a fixing module, the operating platform 2 being installed above the protection module, the operating platform 2 being provided with a fixing module, a recertification test plate 8 being placed on the operating platform 2, the fixing module fixingly connecting the recertification test plate 8 to the operating platform 2, the protection module comprising a base 1 and a surrounding wall 3, the base 1 being provided at the lower end of the surrounding wall 3, the base 1 sealing the lower end surface of the surrounding wall 3, the operating platform 2 being installed on the upper end surface of the surrounding wall 3, a welding operation port being provided in the middle of the operating platform 2, fixing columns 7 being symmetrically provided on both sides of the welding operation port of the operating platform 2, the fixing module being connected to a fixed place, and a recertification test plate 8 being provided between the fixing module and the operating platform 2.

[0025] By setting up the operating platform 2 and the fixing plate 6, the verification test plate 8 can be fixed quickly and accurately, while ensuring that the welding port of the verification test plate 8 is located on the welding operation port, thereby improving the welding efficiency, shortening the verification time, and greatly reducing the time occupied in actual ship production.

[0026] The surrounding wall 3 is in a square shape as a whole, and an air inlet 5 and an air outlet are symmetrically arranged on the side of the surrounding wall 3 . The end surface area of ​​the base 1 is larger than the end surface area of ​​the bottom opening of the surrounding wall 3 .

[0027] The operating platform 2 is in the shape of a rectangular parallelepiped as a whole, and the area of ​​the operating platform 2 is larger than the area of ​​the upper opening end surface of the surrounding wall 3. The surrounding wall 3 is sealed by the operating platform 2 on all sides, and the welding operation port is opened in the middle of the opening end surface of the surrounding wall 3. The fixed columns 7 on both sides of the welding operation port are perpendicular to the operating platform 2. The width spacing between the two fixed columns 7 arranged on one side of the welding operation port is larger than the width of the welding operation port, and the length spacing between the fixed columns 7 on both sides of the welding operation port is larger than the length of the welding operation port.

[0028] The fixing module includes two fixing plates 6 with the same structure. Fixing grooves are provided at both ends of the fixing plates 6. The fixing plates 6 are respectively installed on both sides of the welding operation port. Fixing columns 7 are inserted into the fixing grooves on both sides of the fixing plates 6, and the fixing plates 6 are fixed by bolts. The thickness of the fixing plates 6 is not less than 5 mm and not more than 10 mm, which ensures the strength while not hindering the welding operation of the re-certification test plate 8.

[0029] The re-certification test plate 8 is a rectangular plate as a whole, and clamping plates 81 are arranged on both sides of the re-certification test plate 8 . The clamping plates 81 on both sides of the re-certification test plate 8 are installed between the fixing columns 7 .

[0030] A method for recertifying a PW3 welder certificate for an LNG ship, the method specifically comprising the following steps:

[0031] S1, prepare a PW3 welder certificate recertification device suitable for LNG ships, the device includes a protection module, an operating platform 2 and a fixing module, the operating platform 2 is installed above the protection module, the operating platform 2 is provided with a fixing module, the recertification test plate 8 is placed on the operating platform 2, the fixing module fixes the recertification test plate 8 to the operating platform 2, the protection module includes a base 1 and a surrounding wall 3, the base 1 is provided at the lower end of the surrounding wall 3, the base 1 seals the lower end surface of the surrounding wall 3, the operating platform 2 is installed on the upper end surface of the surrounding wall 3, a welding operation port is provided in the middle of the operating platform 2, and fixed columns 7 are symmetrically provided on both sides of the welding operation port of the operating platform 2, the fixing module is connected to the fixed module, and the recertification test plate 8 is provided between the fixing module and the operating platform 2;

[0032] S2, two re-verification test plates 8 are respectively installed on the operating platform 2, and the clamping plates 81 on both sides of the re-verification test plates 8 are respectively installed between the fixed columns 7 on both sides of the welding operation port; the connection between the two re-verification test plates 8 is above the welding operation port;

[0033] S3, after the re-certification test plate 8 is installed, the fixing plate 6 is installed above the re-certification test plate 8, and the fixing columns 7 on both sides of the welding operation port are inserted into the fixing grooves on both sides of the fixing plate 6 and fixed by bolts;

[0034] S4, after the fixing plate 6 is installed, the air inlet 5 on the surrounding wall 3 is connected to the argon gas pipeline, and argon gas is filled into the surrounding wall 3 through the argon gas pipeline;

[0035] S5, after the surrounding wall 3 is filled with argon gas for one minute, the welding of the re-certification test plate 8 is started, and the welding of the re-certification test plate 8 is completed;

[0036] When the re-verification test plate 8 is welded, the argon gas pipeline continuously fills the surrounding wall 3 with argon gas. When the re-verification test plate 8 is welded and cooled, the filling of argon gas into the surrounding wall 3 is stopped.

[0037] After the welding of the verification test plate 8 is completed, the argon gas in the surrounding wall 3 is exhausted through the gas outlet holes of the surrounding wall 3.

[0038] The distance between the fixing plates 6 installed on both sides of the welding operation port is greater than 20 mm.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A PW3 welder certificate re-certification device suitable for LNG ships, characterized in that: The device comprises a protection module, an operating platform and a fixing module. The operating platform is installed above the protection module. The fixing module is arranged on the operating platform. A verification test plate is placed on the operating platform. The fixing module fixes the verification test plate to the operating platform. The protection module comprises a base and a surrounding wall. A base is arranged at the lower end of the surrounding wall. The base seals the lower end surface of the surrounding wall. The operating platform is installed on the upper end surface of the surrounding wall. A welding operating port is arranged in the middle of the operating platform. Fixed columns are symmetrically arranged on both sides of the welding operating port of the operating platform. The fixing module is connected to a fixed post. A verification test plate is arranged between the fixing module and the operating platform.

2. A PW3 welder certificate recertification device for LNG ships according to claim 1, characterized in that: The surrounding wall is in a square shape as a whole, and air inlet holes and air outlet holes are symmetrically arranged on the side of the surrounding wall. The end surface area of ​​the base is larger than the end surface area of ​​the opening at the bottom of the surrounding wall.

3. The device for recertifying PW3 welder certificates for LNG ships according to claim 1 is characterized in that: The operating platform is in the shape of a rectangular parallelepiped as a whole, and the area of ​​the operating platform is larger than the area of ​​the upper opening end surface of the surrounding wall. The surrounding wall is sealed by the operating platform on all sides, and the welding operation port is opened in the middle of the opening end surface of the surrounding wall. The fixed columns on both sides of the welding operation port are perpendicular to the operating platform, and the width spacing between the two fixed columns arranged on one side of the welding operation port is larger than the width of the welding operation port, and the length spacing between the fixed columns on both sides of the welding operation port is larger than the length of the welding operation port.

4. The device for recertifying PW3 welder certificates for LNG ships according to claim 1 is characterized in that: The fixing module includes two fixing plates with the same structure. Both ends of the fixing plates are provided with fixing grooves. The fixing plates are respectively installed on both sides of the welding operation port. Fixing columns are inserted into the fixing grooves on both sides of the fixing plates, and the fixing plates are fixed by bolts.

5. The device for recertifying PW3 welder certificates for LNG ships according to claim 1 is characterized in that: The re-certification test plate is a rectangular plate as a whole, and clamping plates are arranged on both sides of the re-certification test plate, and the clamping plates on both sides of the re-certification test plate are installed between the fixing columns.

6. A method for recertifying PW3 welder certificates for LNG ships, characterized in that: The method specifically comprises the following steps: S1. Prepare a PW3 welder certificate recertification device for LNG ships, the device comprising a protection module, an operating platform and a fixing module. The operating platform is installed above the protection module, the operating platform is provided with a fixing module, a recertification test plate is placed on the operating platform, the fixing module fixes the recertification test plate to the operating platform, the protection module comprises a base and a surrounding wall, the lower end of the surrounding wall is provided with a base, the base seals the lower end face of the surrounding wall, the operating platform is installed on the upper end face of the surrounding wall, a welding operation port is provided in the middle of the operating platform, and fixing columns are symmetrically provided on both sides of the welding operation port of the operating platform, the fixing module is connected to the fixing module, and a recertification test plate is provided between the fixing module and the operating platform; S2, install two re-certification test plates on the operating platform respectively, and install the clamping plates on both sides of the re-certification test plates between the fixed columns on both sides of the welding operation port respectively; the connection point of the two re-certification test plates is above the welding operation port; S3, after the re-certification test plate is installed, install the fixing plate on the top of the re-certification test plate, insert the fixing columns on both sides of the welding operation port into the fixing grooves on both sides of the fixing plate, and fix them with bolts; S4, after the fixing plate is installed, the air inlet hole of the surrounding wall is connected to the argon gas pipeline, and argon gas is filled into the surrounding wall through the argon gas pipeline; S5, after the enclosure is filled with argon gas for one minute, the welding of the re-certification test plate is started and the welding of the re-certification test plate is completed.

7. A method for recertifying PW3 welder certificates for LNG ships according to claim 6, characterized in that: When the re-verification test plate is welded, the argon gas pipeline continuously fills the surrounding wall with argon gas. When the re-verification test plate is welded and cooled, the filling of argon gas into the surrounding wall is stopped.

8. A method for recertifying PW3 welder certificates for LNG ships according to claim 6, characterized in that: The distance between the fixing plates installed on both sides of the welding operation port is greater than 20 mm.

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