KR20190073219A - The overlay welding method of submarine through-hole - Google Patents

Abstract

Provided is an overlay welding method for a through-hole of a submarine, capable of simplifying a cladding welding process. According to the present invention, the overlay welding method for a submarine through-hole including a flange and a sleeve comprises the steps of: processing the central part of the flange to secure a welding space; inserting a bush into the processed flange; performing temporary welding to bond the flange and the bush; fixing the flange on a rotational plate and using a single welding material to perform tungsten inert gas (TIG) welding between the flange and the bush while rotating the rotational plate; and grinding a welding surface after completing the TIG welding to complete the through-hole with a flat surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an overlay welding method for submarine through-

The present invention relates to an overlay welding method for a submarine through-hole. More particularly, the present invention relates to a method of overlay welding of a submerged through-hole for simplifying steps and reducing the number of necessary welding materials, instead of the conventional complicated and cumbersome method of performing through-hole cladding welding.

In the submarine drying, pipes and flange-shaped parts that allow electric wires, fluids, and crews to pass through the bulkhead of the watertight area can pass through are through holes. The flange has the same structure as the hull bulkhead, and a pipe type sleeve through which electric lines, fluids, and crews pass is inserted into the flange to form a through hole. Sleeves are mainly corrosion resistant materials and are made of copper-nickel based materials.

In the production of such a through hole, the space between the sleeve and the flange is welded to the workpiece, which is called cladding (cladding welding) work. Specifically, the work of filling the gap between the sleeve and the flange with several welding materials and welding is referred to as a cladding operation.

In the past, most submarines have been built using German design technology. Therefore, the method of manufacturing the through hole is also made using the Hadebe design technique. However, the conventional method of manufacturing the through-hole is very complicated, and there is a problem that a large number of welding materials must be used.

Korean Patent Laid-Open No. 10-2012-0019826 (Announcement date March 7, 2012)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an overlay welding method of a through hole for a submarine which can simplify a cladding welding process so as to enable automatic welding and reduce the number of necessary welding materials.

It is to be understood, however, that the technical scope of the present invention is not limited to the above-described embodiments, but may be variously modified without departing from the technical spirit and scope of the present invention.

According to an aspect of the present invention, there is provided an overlay welding method for a submarine through-hole, including a flange and a sleeve, A step of machining a center portion of the flange, a step of inserting a bush into the machined flange, a step of making a contact with the flange so as to join the bush, a step of fixing the flange on the rotating plate, Performing a TIG (Tungsten Inert Gas) welding using a single welding material; polishing the welding surface after completing the TIG welding to complete the through-hole having a flat surface.

In an embodiment according to the present invention, the single weld material may be ERNiCu-7 with 65% nickel and cobalt, ERNi-1 with 96% nickel, or ERNiCr-3 with 72% nickel and 20% chromium have.

In an embodiment according to the present invention, the bushing is a Cu-Ni bush, and the flange may be HY80 carbon steel or HY100 carbon steel.

In an embodiment of the present invention, after completion of the through-hole, a step of performing a liquid penetration test may be performed to check whether there is a surface defect.

Other specific details of the invention are included in the detailed description and drawings.

According to the present invention, as an overlay welding method for a submarine through-hole, welding productivity can be improved.

Further, according to the present invention, it is possible to reduce the number of welding correction operations necessary for welding defects.

In addition, according to the present invention, automatic welding is possible in overlay welding of a penetration hole for a submarine.

In addition, according to the present invention, the cladding welding operation can be relatively easily performed, and the operation cost can be reduced.

Further, according to the present invention, it is possible to use a low-volume welder or an operator, thereby solving the problem of supply and demand of a high-quality welder.

In addition, according to the present invention, since the automatic welding is possible, the fatigue of the worker can be reduced and the worker's musculoskeletal disease can be prevented by the simple repetitive work.

However, the effects of the present invention are not limited to the above effects, and can be variously extended without departing from the spirit and scope of the present invention.

1 is a view showing a name applied to a through hole.
Fig. 2 is a view sequentially showing a conventional through-hole making method.
3 is a flowchart sequentially illustrating an overlay welding method for a submarine through-hole according to the present invention.
4 is a perspective view schematically showing a through hole according to the present invention.
Fig. 5 is a view schematically showing a cross-sectional view of a through-hole applied to the present invention. Fig.
Fig. 6 is a table showing a specific configuration of the welding material used in the present invention. Fig.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

The terms described below are defined as follows.

The through hole is a pipe and a flange-like part that allows the electric wire, fluid, and crew to pass through the bulkhead of the watertight area in the drying of the submarine. The flange has the same structure as the hull bulkhead. Is inserted into the flange. Sleeves are mainly corrosion resistant materials and are made of Cu-Ni base material.

The cladding welding of the through-hole means that the space between the sleeve and the flange is welded to each other in the production of the through-hole, which is referred to as "cladding welding".

Machining means that the workpiece is piled higher than the machining dimension by cladding welding, and then the workpiece is subjected to surface machining (grinding process) as required by machining. After the machining operation, the presence or absence of defects on the surface is confirmed through a penetration test (PT), and a work for forming a flange connection hole is performed as shown in Fig. FIG. 1 is a view showing a name applied to a through-hole, and the configuration of a flange, a sleeve, and a cladding weld can be understood with reference to FIG.

Fig. 2 is a view sequentially showing a conventional through-hole making method.

In the past, most of the submarines have been manufactured using the German design technique. Therefore, the through hole is also manufactured by applying the Hadebe design technology as it is. However, the conventional method of manufacturing the through-hole is very complicated and a large number of welding materials must be used in the welding process during the through-hole forming process.

Referring to FIG. 2, in the conventional method of manufacturing a through-hole, first, 1) a carbon steel (ultrahigh tensile steel) is subjected to THER.XW 140K for super-layer welding. Next, THER 20 / 10W 140K is formed on the upper part by welding two layers to N layers.

2) Then machined with R14 to form a curved space at the center of carbon steel.

3) Then, double-layer buttering welding is performed with UTP068HH in the machined area.

4) Then, the end of the carbon steel core is welded with UTP80M.

5) Machining to R9 again to remove part of the part formed at the end of carbon steel core.

6) Then, welding is performed using Cu-Ni Bush and UTP80M.

As described above, five welding materials are used for the conventional welding method for forming the through-hole. In the welding of the carbon steel and the Cu-Ni bush, the carbon steel and the Cu-Ni bush are different materials Because of this, it is to make many different welding materials from carbon steel to Cu-Ni bush and to make the properties similar. Finally, materials with similar physical properties to Cu-Ni bushes are used as final welding materials. More than two machining operations are required. This complicates the manufacturing process, and costs are relatively high.

Alternatively, according to the present invention, one welding material is used, and a TIG welding process or a PAW welding process can be used as a whole. According to the present invention, the welding material is united to simplify the process, and the quality of the product is excellent and the number of processes of the final product can be reduced. In particular, it is possible to automate the welding process, the production time can be reduced, the degassing amount and cost can be reduced.

Conventional through-hole fabrication methods have the following problems.

1) Many welding materials should be used.

2) TIG welding process and SMAW welding process should be applied.

3) Since there are many types of welding materials, the number of welding processes increases in the order of first welding-processing-inspection-second welding.

4) When SMAW welding process is applied, weldability is not good and many defects occur.

5) Production time and number of processes are increased, meat quantity is required, and manufacturing cost is increased.

Here, the SMAW welding process will be briefly described.

As described above, in the SMAW (Shield Metal Arc Welding) welding process as a welding method that has been used conventionally, the welding material is very special and the welding material is produced in the shape of a rod. In the SMAW welding process, . SMAW welding process is a very long welding method, but welding equipment is very important, welding is very bad due to many fluxes, welding defects, defects such as poor penetration and slag mixing are frequent. In the SMAW welding process, the welding material is composed of a rod shape, so that the welding material is frequently replaced and welding defects are likely to occur at the welded joint. Therefore, the productivity is very low and the welding process is performed depending on the high-quality welder.

In order to weld the submarine penetration hole, the SMAW welder has difficulty in quality control due to the problem of acquiring a separate Cert. In addition, there are difficulties in material management because it is produced in several places when the material is received.

Accordingly, in order to solve such a problem, the present invention attempts to unify the welding material, and the welding method is to use a GTAW (Gas Tunnel Arc Welding) welding process or a TIG (Tungsten Inert Gas) welding process in the SMAW welding process.

3 is a flowchart sequentially illustrating an overlay welding method for a submarine through-hole according to the present invention. 4 is a perspective view schematically showing a through hole according to the present invention. Fig. 5 is a view schematically showing a cross-sectional view of a through-hole applied to the present invention. Fig. Fig. 6 is a table showing a specific configuration of the welding material used in the present invention. Fig.

3 and 4, an overlay welding method for a submarine through-hole according to the present invention includes: 1) machining a center portion of a flange 100 to secure a welding space (S100). At this time, the flange 100 may be HY80 carbon steel or HY100 carbon steel.

2) The Cu-Ni bushing 110 is inserted into the machined flange 100 at step S110, and 3) the soldering step is performed to bond the flange 100 and the Cu-Ni bushing 110 together at step S120.

4) The flange 100 and the Cu-Ni bush 110 are subjected to TIG (Tungsten Inert Gas) welding using a single welding material while fixing the flange 100 on the rotating plate and rotating the rotating plate S130). The welding torch to be used at this time can be directly welded by a worker using a wire feeding device which supplies the welding material automatically, or can perform welding work by using an automatic device.

5) After the completion of the TIG welding, the welding surface is machined (polishing step) to complete a through hole having a flat surface (S140).

4 and 5, R-machining is performed in order to deform the shape of the flange 100 to secure a weld between the Cu-Ni bush 110 and the flange 100. [

At this time, R-machining should be machined to 15mm or more. This is to make the nozzle of the TIG welding torch free. The depth of R-processing is 3 mm or more.

In this case, the welding material used may be ERNiCu-7 with 65% of nickel and cobalt as the AWS welding standard, ERNi-1 with 96% nickel, or ERNiCr-3 with 72% nickel and 20% chromium.

The welding method according to the present invention is characterized by using the three welding materials described above, wherein one of the three welding materials is continuously used for welding. All of the three welding materials are materials that do not cause corrosion in the atmosphere with seawater.

Referring to FIG. 6, the composition of the chemical composition for the three welding materials is shown.

According to the present invention, it is possible to further include a step of performing a liquid penetration test after completion of the through-hole to confirm the presence or absence of a surface defect.

By using the present invention, welding productivity can be improved and the number of corrective operations caused by welding defects can be reduced. Automatic welding is possible.

Further, since the work cost can be reduced and the welder or the operator can perform the welding with a low amount, it is possible to solve the problem of supply and demand of high welding amount.

Automatic welding is possible to reduce worker fatigue and it is very helpful to prevent workers' musculoskeletal diseases due to simple repetition work.

The foregoing embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description. It is intended that all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

100: Flange
110: Bush

Claims (4)

A overlay welding method for a submarine through-hole comprising a flange and a sleeve,
Machining a center portion of the flange to secure a welding space;
Inserting the bushing into the machined flange;
Fusing the flange and the bushing;
Fixing the flange on a rotating plate, rotating the rotating plate, performing TIG (Tungsten Inert Gas) welding on the flange and the bush using a single welding material;
And after completing the TIG welding, polishing the welding surface to complete the through-hole having a flat surface. The method according to claim 1,
Wherein the single weld material is ERNiCu-7 with 65% nickel and cobalt, ERNi-1 with 96% nickel, or ERNiCr-3 with 72% chromium and 20% chromium. The method according to claim 1,
Wherein the bushing is a Cu-Ni bushing and the flange is HY80 carbon steel or HY100 carbon steel. The method according to claim 1,
Further comprising the step of performing a liquid penetration test to confirm the presence or absence of a surface defect after completing the through hole.

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