KR20080107697A - Copper shoe for electro gas welding - Google Patents

Abstract

A copper shoe for an elector gas welding is provided to prevent the welding machine from being damaged when the welding machine is adjacent to the copper shoe by the forced air cooling, forced liquid cooling and natural cooling using a pin. A copper shoe for an elector gas welding comprises a gas porket(11) which provides the protective gas when fusing the composite wire and base material and progressing welding by arc generated between the composite wire and the base material; and a hotwire(12) which is connected to the means for power supply and preheats temperature to the optimal level.

Description

Copper shoe for Electro Gas Welding

1 is an illustration of a base material for welding using a conventional EGW apparatus.

Figure 2 is an exemplary cross-sectional view showing the configuration of a conventional backing material.

3 is a plan view showing a copper filler for electrogas welding of the present invention.

Figure 4 is a side view showing a copper filler for electro-gas welding of the present invention.

5 is a perspective view showing a copper filler for electrogas welding of the present invention.

Figure 6 is a view showing a copper immersion hot wire temperature control device that can set the initial temperature of copper immersion.

7 is a view showing a state of preheating before the start of welding by attaching a copper wire containing a heating wire to the Al grain-oriented MIG welding equipment.

8 is a view showing a copper alloy shape does not include a cooling device.

9 is a view showing an air-cooled copper quench using compressed air.

10 is a graph showing the results of predicting the temperature change of copper quench according to the compressed air flow rate by CFD analysis.

FIG. 11 is a view showing a case in which the heat transfer area is made larger than that of the copper quench shown in FIG.

12 is a view of applying the water-cooled cooling method to the same copper coating applied air-cooled cooling method.

FIG. 13 is a graph illustrating a result of predicting the temperature of copper coolant according to the coolant flow rate when applying the water-cooled copper coolant cooling method of FIG. 12 to a large-capacity Al grain-oriented MIG welding.

FIG. 14 is a view showing a case in which the heat transfer area between the coolant and the copper solution is greatly reduced compared to the copper solution shown in FIG. 12. FIG.

15 is a view showing a copper pin formed with a cooling fin.

16 is a state in which a copper fin formed with a cooling fin is installed in the actual welding device.

17 is a temperature graph measured using a K-type thermocouple the temperature of the copper immersion body and the holder portion while performing the actual welding for about 10 minutes.

The present invention relates to a copper filler for electro-gas welding to maintain a proper temperature at the time of electro-gas welding to form a good quality weld bead.

In general, a large structure that requires welding, such as a ship, requires assembling work that interconnects a number of blocks made by joining small plates. In this case, vertical welding work upwards is required using each block as a base material. You will need

Flux cored arc welding (FCAW) and electrogas welding (EGW) are generally used for vertical welding of such large structures.

The electro-gas welding, which has become a mainstream in recent years, faces upwardly upward from the bottom along the 'Ｖ' type welding part 300 formed in the base material 100 and 200, facing the welding part of the base material which is arranged side by side as shown in FIG. 1, The arc is generated using carbon dioxide as a protective gas, and the arc heat is used to melt the base material to join the respective base materials. The surface copper tint is installed on the front of the installed base material and the backing material is used on the back. By cooling the welding heat generated during welding to prevent the molten metal flowing down to form a good backside bead.

At this time, the backing material is installed on the back of the base material is mainly using a ceramic material for ease of installation and removal and work with the base material, the conventional backing material 400 is shown in FIG. As described above, the front part includes a close contact part 410 whose both ends are in close contact with the base material and a forming part 420 which cools the welding heat generated to the back side of the base material during welding with the close contact part therebetween to form a good bead. Consists of, the backing material 400 is configured to be in close contact by the fixing means 430.

However, the backing material as described above must be fixedly attached to the rear of the base material, a separate fixing means is required, and must be attached along the 'Ｖ' type of welding, a plurality of backing material is required, thereby managing parts and purchase / There was a problem that the maintenance cost is increased.

In addition, the conventional backing material is fixedly attached to the rear surface of the base material, so that a gap occurs between the backing material to be attached and another backing material, and a gap occurs between the base material and the backing material, and a welding occurs. There were various problems such as deterioration in quality.

The present invention devised to solve the above problems, since the welding bead state may be poor when starting the welding immediately in the state that the copper alloy is at room temperature, by inserting the electric heating wire inside the copper filler maintains the proper temperature at the initial welding Forced air cooling by compressed air, forced water cooling by cooling water, and natural by fins to effectively discharge the heat generated from the arc as welding proceeds. It is an object of the present invention to provide a copper filler for electro-gas welding, in which a copper filler cooling device is incorporated, which is applied to a cooling method or the like to prevent thermal damage of the welding apparatus in contact with the copper filler and the copper filler.

The present invention for achieving the above object, by the arc generated between the end of the composite wire and the base material, a gas pocket for providing a protective gas when melting the composite wire and the base material to proceed welding; And it is formed bent several times in the copper alloy, and is connected to the power supply to provide a copper filler for the electro-gas welding including a heating wire to preheat the temperature of the initial welding copper to an appropriate level.

Preferably, the method may further include a cooling pipe formed in a predetermined portion of the copper filler to effectively discharge heat generated during welding from the copper filler.

More preferably, the cooling pipe may be a cooling air pipe.

In addition, the cooling pipe may be a cooling water pipe.

In addition, it may further include a cooling fin formed in a predetermined portion of the copper filler to effectively discharge the heat generated during welding from the copper filler.

More preferably, the cooling fins may be formed to match the direction of gravity.

In order to fully understand the present invention, the advantages of the operability of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

FIG. 3 is a plan view showing the copper filler for electrogas welding of the present invention, FIG. 4 is a side view showing the copper filler for the electrogas welding of the present invention, and FIG. 5 is a perspective view showing the copper filler for the electrogas welding of the present invention. to be.

3 to 5, the copper filler 10 for electro-gas welding surrounds the welded portion with a copper plate and inserts CO ₂ formed in the gas pocket 11 into the wire guide, thereby creating a protective gas atmosphere. The composite (welding) wire is fed through the nozzle, and the composite wire and the base metal are melted by an arc generated between the end of the composite wire and the base metal to proceed welding. The protective gas is used depending on the material of the base material, and mainly CO ₂ is used for steel, but sometimes a mixed gas such as CO ₂ -Ar and Ar-O ₂ is used.

In Al-type MIG welding, good welding bead is formed when welding part including copper tin is maintained over a certain temperature. Therefore, it is necessary to raise copper temperature to a certain level through sufficient preheating from the beginning of welding. To this end, the heating wire 12 is bent and built several times in the copper gas welding copper thin film 10, and preheats the copper thin film before welding through the heating wire to a predetermined temperature or more. Both ends of the heating wire are connected to the cathode 14 and the anode 15 to supply power to the heating wire 12. A predetermined portion of the copper filler may be formed with a cooling pipe 20 for effectively discharging heat generated during welding from the copper filler. As the cooling pipe 20, a cooling air pipe (see 21 in FIG. 9) or a cooling water pipe (see 22 in FIG. 14) may be used, and a cooling fin (see FIG. 15 in place of the cooling pipe 20). Reference numeral 30) may be used.

FIG. 6 is a diagram illustrating a copper immersion hot wire temperature control device capable of setting an initial temperature of copper immersion. Referring to FIG. 6, the preheating temperature of the copper charge may be adjusted by adjusting the power supplied to the heating wire 12. The copper foil is heated by Joule heat generated by the heating of the internal heating wire 12, the heating wire temperature control device repeatedly checks the temperature of the pre-heated copper alloy and compared with the setting temperature set by the operator By controlling the electrical strength automatically, the temperature of the copper alloy is adjusted.

7 is a view showing a preheating before welding starts by attaching a copper wire containing a heating wire to the Al grain-oriented MIG welding equipment.

On the other hand, as the Al grain-oriented MIG welding proceeds, the ceramic (see reference numeral 16 in FIG. 8) and copper filler are heated by arc heat generated during welding. Copper, the material for copper immersion, generally has a melting point of around 1100 degrees, so cooling must be done together during the welding process. In addition, the ceramic embedded in the copper quenching has a very high melting point but is fragile at high temperatures, so it must be cooled together with the copper quenching. For this purpose, the hot wire and copper immersion hot wire temperature control device can be used in combination with various cooling methods such as air cooling and water cooling. This will be described in more detail with reference to the drawings below.

FIG. 8 is a view illustrating a copper immersion shape not including a cooling device, and FIG. 9 is a view illustrating an air-cooled copper immersion using compressed air.

Referring to FIG. 9, compressed air is forced to cool the heated copper filler while passing through the copper filler body at high speed. In the case of copper, the thermal conductivity is very high so that the cooling effect of the surface in contact with the compressed air can be quickly transferred to the copper quenching body. 10 is a graph showing a result of predicting a temperature change of copper quench according to the compressed air flow rate by CFD analysis. It can be seen that as the compressed air flow rate increases, the temperature of the copper solution decreases. Therefore, by adjusting the compressed air flow rate, the temperature of the copper can be freely adjusted according to the amount of heat generated by the arc heat.

On the other hand, the cooling method shown in FIG. 11 is a view showing a case in which more compressed air can be supplied than in the case of FIG. 9 and the heat transfer area where forced cooling is made larger. If it is difficult to cool the copper quench by the method shown in Figure 9 due to the large amount of arc calorific value can be applied to the method shown in FIG.

When the Al-type MIG welding method is applied to the Al member having a thickness of 70t or more, a larger power is required, and thus the calorific value of the arc may increase rapidly, and the air coolant forced cooling method may not sufficiently cool the copper alloy and the ceramic. In this case, a water cooling method should be applied. 12 is a view in which the water-cooled cooling method is applied to the same copper alloy to which the air-cooled cooling method is applied. When the coolant is used as the working fluid, the heat transfer coefficient is 10 times larger than that of the air, and thus the cooling effect can be greater even at a smaller flow rate range than when the air is used as the working fluid.

FIG. 13 is a graph of CFD analysis for predicting the temperature of copper coolant according to the cooling water flow rate when the water-cooled copper coolant cooling method of FIG. 12 is applied to a large-capacity Al grain-oriented MIG welding.

In the case of large-capacity welding, if the cooling is not performed, the temperature of the copper thin film rises above the melting point, and the copper thin film melts and normal welding operation is impossible. However, as the cooling water is supplied, the temperature of the copper thin film decreases, so that the temperature of the copper thin film can be adjusted to the best temperature of the welding bead by properly adjusting the amount of cooling water.

14 is a shape for exerting a cooling effect less than in the case of FIG. 12 by greatly reducing the heat transfer area in which the cooling water and copper alloy contact with the cooling method that can be applied when the cooling effect of the water-cooled cooling method is excessive.

12 and 14, when the water-cooled copper quenching cooling method is applied, if the flow rate is not enough, the coolant causes a phase change (boiling) inside the copper quench, liquid phase coolant is a high temperature and high pressure Since the pressure of the coolant pipe increases rapidly as it changes to steam, it is dangerous to supply more than the minimum coolant flow rate to prevent phase change in the coolant pipe.

FIG. 15 is a view illustrating a copper pin on which cooling fins are formed. FIG.

Referring to FIG. 15, when the cooling fin 30 is formed of a natural cooling method using natural cooling, the cooling fin 30 is attached to the body of the copper plating to increase the heat transfer surface in contact with the outside air. to be. Existing air-cooled and water-cooled cooling systems require additional equipment such as pumps, compressors, and supply pipes to supply respective cooling fluids, as well as a separate heat exchanger for heated cooling water. In addition, when the coolant overheats and causes a phase change in the pipe, the pipe may explode and may be fatal to the welding worker. On the other hand, the fin natural cooling type copper coolant does not require a separate mechanical device, and has the advantage of controlling the temperature of the copper coolant by adjusting the number and size of the fins. FIG. 16 is a view illustrating an installation of a copper fin having a cooling fin in an actual welding device, and FIG. 17 is a temperature measured by using a K-type thermocouple while performing actual welding for about 10 minutes. It is a graph. Although the welding time was not fully saturated due to the short welding time, the welding beads were very good during the experiment, and it can easily be expected that the copper tin temperature will not exceed 400 degrees even during long time welding.

It should be noted that when the cooling fins 30 are installed on the copper immersion body, the direction of the cooling fins 30 coincides with the direction of gravity so that the heated air may escape between the cooling fins 30 without being blocked when the air is heated up. Is that you should.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention, when welding starts immediately in a state where copper quenching is performed at room temperature, the welding bead state may be poor. Thus, by inserting an electric heating wire therein, the copper quench may be maintained at an initial temperature so that normal beads may be formed. In order to effectively discharge the heat generated from the arc to the outside as the welding is performed with the prepaid preheating device, it is applied to the forced air cooling method by the compressed air, the forced water cooling method by the cooling water, the natural cooling method by the fin, etc. Provided is a copper filler for electro-gas welding with an integrated copper cooler to prevent thermal damage of the welding device in contact with the copper filler.

Claims (6)

A gas pocket for providing a protective gas when the composite wire and the base material are melted by an arc generated between the ends of the composite wire and the base material to perform welding; And A copper filler for electro-gas welding, which is formed by bending several times inside the copper alloy, and includes a heating wire connected to the power supply means to preheat the temperature of the initial welding copper to an appropriate level. The method of claim 1, And a cooling pipe formed on a predetermined portion of the copper filler to effectively discharge heat generated during welding from the copper filler. The method of claim 2, The cooling pipe is a copper filler for electro-gas welding that is a cooling air pipe. The method of claim 2, The cooling pipe is a copper filler for electro-gas welding that is a cooling water pipe. The method of claim 1, And a cooling fin which is formed in a predetermined portion of the copper tin to effectively discharge heat generated during welding from the copper tin. The method of claim 5, The cooling fins are copper immersion for electro-gas welding is formed to match the direction of gravity.

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