JPH0698509B2 - Method for manufacturing a ceramic welded backing and its use - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a ceramic welding backing and its use, and more particularly to a method for manufacturing a ceramic welding backing used as an auxiliary device when welding a metal base material, and Regarding how to use it.

[0002]

2. Description of the Related Art Conventionally, a ceramic welding backing has been used as an auxiliary device when welding a metal base material. This porcelain welded backing is produced by firing Al ₂ O ₃ based clay. When welding the metal base material, by using this ceramic welding backing, it is possible to form an appropriate stake on the root side back surface of the weld seam without excess or deficiency, and the strength of the welded surface of the metal base material. Can be improved.

[0003]

However, since the conventional ceramic welding backing is manufactured by firing Al ₂ O ₃ based clay, it is porous and easily absorbs water. When firing the Al ₂ O ₃ based clay in a semi-molten state at a relatively high temperature of 1400 to 1500 ° C. during the firing treatment, most of the pores on the surface become isolated or disappear. To do. Therefore, it is possible to obtain a glass-made ceramic welding backing having a very low porosity without absorbing water. However, when the firing treatment is performed at such a high temperature, the ceramic welding backing is easily deformed in the high temperature treatment step. When such a deformed ceramic welding backing is used, it is difficult to hold and weld the two metal base materials on the same horizontal surface. Therefore, even under the present circumstances, the welding backing made of ceramics is still manufactured by performing the firing treatment at a temperature of around 1200 ° C., which is less deformed.

When various kinds of metals are welded by using a ceramic welding backing which absorbs moisture as described above, a fatal defect is included in the weld seam due to the absorbed moisture. The welding effect of the pad is impaired. On the other hand, as described above, when the firing process is performed at a high temperature, the ceramic welding backing is deformed, and it is difficult to hold the ceramic welding backing at a predetermined position of the metal base material by holding it. Even if gold is used, there is a problem that a shift easily occurs during welding work.

Therefore, the main object of the present invention is to prevent the absorption of moisture from the outside, to use it normally under various weather conditions, and to improve the quality of the weld metal. The metal base material can be fixed more firmly than using the pad manufacturing method and presser foot,
It is an object of the present invention to provide a method of using a ceramic welding backing that can be smoothly welded.

[0006]

A first aspect of the present invention includes a step of forming a unglazed ceramic welding backing, and a step of forming a ceramic protective layer on the surface of the ceramic welding backing by firing. A method for manufacturing a ceramic welded backing, including:

As the firing treatment, it is preferable to heat the surface of the ceramic welding backing at 1450 to 1500 ° C.

As the firing treatment, the surface of the ceramic welding backing is dipped in a low melting point ceramic solution to coat it,
The surface of the ceramic backing may be heated to 12
It is preferable to carry out at a temperature of 50 to 1300 ° C.

Furthermore, as a firing treatment, after the low melting point ceramic solution is sprayed onto the surface of the ceramic welding backing to cover it, the surface of the ceramic welding backing may be heated. The heating is performed at a temperature of 1250 to 1300 ° C. It is preferable to carry out.

A second aspect of the invention is to prepare an adhesive sheet containing a high heat resistant adhesive layer, a release paper and an aluminum foil, and to form an arcuate section slot formed on the upper surface of a ceramic welding backing between metal base materials. Match the welding seams, peel off the release paper from the adhesive sheet, attach the adhesive sheet to the bottom surface of the metal base material with a high heat resistant adhesive layer, and fix the metal base material and the ceramic welding backing And a step of welding the metal base material while filling the welded seam with the molten steel liquid generated by the method.

[0011]

[Function] Although a ceramic welding backing is manufactured by forming a ceramic protective layer on the surface of a ceramic welding backing formed by unglazing porcelain clay that has not yet been used for welding work, Since this protective layer has a good waterproof property, even if the ceramic welded backing gets wet with rain or soaks in water, water is not absorbed and stored inside. Therefore, the high temperature during welding does not cause bubbles to enter into the molten steel liquid filled in the welding joint between the two metal base materials.

Further, an adhesive sheet containing a high heat resistant adhesive layer, a release paper and an aluminum foil is prepared, and the arcuate cross-section slot formed on the upper surface of the ceramic welding backing is aligned with the welding joint between the metal base materials. , Peel off the release paper from the adhesive sheet,
Since the adhesive sheet is attached to the bottom surface of the metal base material by the high heat resistant adhesive layer, the metal base material and the ceramic welding backing are firmly fixed and the welding operation is performed. In addition, when performing single-sided welding of two metal base materials, since a surplus protruding downward in an arc shape is formed on the bottom surface of the weld seam,
The strength of the welded surface is improved.

Further, as a first method of firing treatment for manufacturing a ceramic welding backing, the surface of the ceramic welding backing is heated at 1450 to 1500 ° C. Also,
As the second method of firing treatment, the surface of the ceramic welding backing is dipped in a low melting point ceramic solution to cover it, and then the surface of the ceramic welding backing is heated.
It is carried out at a temperature of 00 ° C. Furthermore, as the third method of the firing treatment, the surface of the ceramic welding backing is sprayed with a low-melting point ceramic solution and then the surface of the ceramic welding backing is heated, and the heating is performed at a temperature of 1250 to 1300 ° C. Done in. When the surface of the ceramic welding backing is baked by such a method, the formed ceramic protective layer becomes more dense and the waterproof property is further improved.

[0014]

According to the present invention, a ceramic weld backing is manufactured by forming a ceramic protective layer on the surface of the ceramic weld backing. This protective layer is highly waterproof, so even if you inadvertently inadvertently wet the ceramic welded backing with rain or soak it in water, the protective layer works to allow moisture to easily get inside the ceramic welded backing. It does not enter and stays on the surface. Therefore, if the surface moisture is blown dry by, for example, an air compressor, the welding work made of ceramic can be used immediately.

The ceramic welded backing does not fundamentally contain water due to the function of the protective layer having excellent waterproofness. Therefore, even in a highly humid season such as the rainy season, it can be used immediately by simply drying the surface of the ceramic welding backing to dry it. If you use this ceramic welding backing to weld various metals,
The bond strength of the weld seam between the base metal is not impaired by the absorbed water, and the welding quality can be improved.

By using this ceramic welding backing, the welding work can be performed at any time regardless of the weather conditions, the welding time is shortened, and the welding cost is reduced. Furthermore, according to the method of using the ceramic weld backing of the present invention, the molten steel liquid is reliably retained during single-side welding of various metals, and has an effect of assisting extra-molding on the bottom surface of the weld seam. . Therefore, the welding design and the construction sequence can be simplified, and the production efficiency can be improved.

Further, since the firing process for producing the ceramic welded backing is performed at 1200 to 1300 ° C. or at a high temperature of 1450 ° C. to 1500 ° C., it is performed instantaneously in time. The interior of the welded backing is not affected. Therefore, the ceramic welding backing is not curved and can hold a predetermined portion of the metal base material during welding, and the metal base material is less likely to be displaced during the welding operation. That is, according to the present invention, the metal base material can be firmly fixed and can be welded smoothly as compared with the case of using the presser foot.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the following embodiments given with reference to the drawings.

[0019]

1 is a perspective view of an essential part showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II--II in FIG. The ceramic weld backing 10 includes a thin plate-like unglazed ceramic weld backing 11 formed on the inner surface thereof. The ceramic welding backing 11 is formed by treating Al ₂ O ₃ based porcelain clay which has not yet been used for welding at a temperature of around 1200 ° C. The welded backing 11 made of ceramic is made of SiO ₂
It may be formed using a clay system. Ceramic welded backing 1
The entire surface of 1 is completely covered with a thin protective layer 15. The protective layer 15 is made of ceramic and is completely waterproof. Also, the ceramic welding backing 10 is
At the center of its top surface, there is an arcuate section slot 101 that extends from one end to the other. Therefore, the ceramic weld backing 11 also corresponds to the arc-shaped cross-section slot 101 of the ceramic weld-backing 10 and has an arc-shaped cross-section slot 111 that reaches from the one end to the other end at the center of the upper surface thereof.
Have. Further, the protective layer 15 also has an arcuate section slot 101.
Curve at the part of.

As shown in FIG. 1, the ceramic weld backing 10 is used as an auxiliary device when welding the metal base material 20. The metal base material 20 is mainly used for welding steel and iron alloys, but can be used for any weldable metal such as non-ferrous and non-ferrous alloys. When the two metal base materials 20 are welded using the ceramic weld backing 10, the thin film adhesive sheet P is attached to the bottom surface of the ceramic weld backing 10. Further, the adhesive sheet P is attached also to the bottom surfaces of the two thin plate-shaped metal base materials 20 that are securely fixed. Then, the welding seam 201 between the metal base materials 20.
Is an arc-shaped cross-section slot 1 of a ceramic welded backing 10
The metal base material 20 and the ceramic weld backing 10 are firmly fixed by the adhesive sheet P so as to exactly correspond to 01.

The adhesive sheet P includes an aluminum foil 14. The high heat resistant adhesive layer 12 is applied and formed on one surface of the aluminum foil 14. The high heat resistant adhesive layer 12 is formed of, for example, an acrylic adhesive. High heat resistant adhesive layer 12
The release paper 13 is formed on the surface opposite to the aluminum foil 14 in.

When using the adhesive sheet P, the release paper 13 is peeled off from the adhesive sheet P. Then, due to the viscosity of the exposed high heat resistant adhesive layer 12, the adhesive sheet P is attached to the bottom surface of the ceramic welding backing 10 and further to the bottom surfaces of the two metal base materials 20.

As described above, when the metal base material 20 and the ceramic weld backing 10 are fixed so that the weld seam 201 and the arcuate cross-section slot 101 are accurately aligned with each other, a welding device (not shown) is provided. Is aimed at the weld seam 201. Then, the electrodes of the welding device are discharged to generate high heat, the side portions of the metal base material 20 on both sides of the welding seam 201 are melted, and molten steel liquid 21 is generated. The molten steel liquid 21 is stored in the weld seam 201 between the two metal base materials 20 and the arcuate section slot 101 of the ceramic weld backing 10.

Weld seam 2 of ceramic weld backing 10
The portion corresponding to 01 is recessed downward as the arc-shaped cross section slot 101, so that the molten steel liquid 21 is evenly distributed and filled in the weld seam 201 between the metal base materials 20. Further, since the metal base material 20 and the ceramic welding backing 10 are firmly fixed by the adhesive sheet P so that the welding seam 201 and the arc-shaped cross-section slot 101 correspond to each other, the molten steel liquid is filled in the arc-shaped cross-section slot 101. 21 is filled. In this way, the two metal base materials 20 are smoothly and integrally welded, and the single-sided metal welding work is completed.

In the metal welding operation, the arc-shaped cross-section slot 101 has a function similar to that of the sand mold in the casting process. That is, since a surplus protruding downward in an arc shape corresponding to the arc-shaped cross-section slot 101 is formed on the bottom surface of the portion where the two metal base materials 20 are single-side welded, the two metal base materials 20 are formed. The strength of the welded surface is improved. Further, although the welding is performed at an ultrahigh temperature close to 1400 ° C. or higher, the physical properties of the ceramic welding backing 10 are not affected.

Protective layer 15 of ceramic welded backing 10
There are three forming methods as described below, for example.

In the first method of forming the protective layer 15, as shown in FIG. 3, the surface of the ceramic welding backing 11 is heated by the ultra-high temperature heat source 151 and instantaneously completely burned. In this way, the ceramic weld backing 10 covered with the ceramic protective layer 15 is formed. The ultra-high temperature heat source 151 used in the first forming method
The temperature is about 1450 to 1500 ° C.

In the second method of forming the protective layer 15, as shown in FIG. 4, the surface of the ceramic welding backing 11 is dipped in the solution of the low melting point ceramic 152 to form the surface of the ceramic welding backing 11. Is coated with a low melting point ceramic film, and the surface of the ceramic welding backing 11 is heated by the high temperature heat source 153 to be completely baked. In this way, the ceramic weld backing 10 covered with the ceramic protective layer 15 is formed. The temperature of the high temperature heat source 153 used in this second forming method is about 1250 to 130.
It is 0 ° C. This second forming method is a dipping method (Dipp
ing process).

In the third method of forming the protective layer 15, the high melting point ceramic layer is pressure-molded on the surface of the ceramic welding backing 11, and then the low melting point ceramic solution is immediately sprayed to form a further layer. The low-melting-point ceramic of No. 3 is coated, and the surface of the ceramic welding backing 11 is heated by a high temperature heat source to be completely fired. In this way, the ceramic weld backing 10 covered with the ceramic protective layer 15 is formed. The temperature of the high temperature heat source used in this third forming method is about 1200 to 1300 ° C. This third forming method is a spray method (Spray Pr
process).

The low melting point ceramic is mixed with a substance for lowering the melting point, and the high melting point ceramic is not mixed with a substance for lowering the melting point. The high melting point ceramic and the low melting point ceramic 152 may be properly used depending on the type of the metal base material 20. For example, a high melting point ceramic is used for a metal having a high melting point such as a steel material, and a low melting point ceramic 152 is used for a metal having a low melting point such as a non-ferrous material.

In the second and third methods for forming the protective layer 15, the low melting point ceramic layer is treated and coated on the surface of the ceramic welding backing 11 at a temperature of about 1200 to 1300 ° C., respectively. In addition, in the first forming method, about 1
The surface of the ceramic welding backing 11 is baked at a high temperature of 450 to 1500 ° C. to form the protective layer 15, but the heating time is instantaneous. Therefore, by any of the forming methods, the inside of the ceramic welding backing 11 is not affected, and the conventional non-curved state can be maintained. If the temperature exceeds these temperature ranges, the surface of the ceramic welding backing 10 may be slightly melted.

As mentioned above, a ceramic weld backing 1
Uncooked ceramic welding backing 11 formed on the inner surface of 0
Is formed by treating Al ₂ O ₃ based clay at a temperature of around 1200 ° C. The entire surface of the ceramic welded backing 11 is covered with a ceramic protective layer 15.
The ceramic welding backing 10 holds the molten steel liquid 21 during the single-sided welding of various metal base materials 20, and the welding work proceeds, but since the protective layer 15 is waterproof, it is made of ceramic. Absorption of moisture from the outside in the welding backing 10 is completely prevented. Thus, the ceramic weld backing 10 can be used normally under a variety of weather conditions. For example, even if the surface of the ceramic welding backing 10 gets wet with rain, there is no possibility that water will enter the inside of the ceramic welding backing 10. Moreover, by welding the metal base material 20 by using the ceramic weld backing 10, it is possible to obtain excellent welding quality, and it is possible to speed up and simplify the welding, which is an excellent effect. Can be obtained.

In the above-described second and third methods of forming the protective layer 15, the surface of the ceramic welding backing 11 is coated with the low melting point ceramic layer. A seam at the time of welding between the two metal base materials 20 forms a weld seam 201 corresponding to the arc-shaped cross-section slot 101 of the ceramic weld backing 10. Then, the welding device is aimed at the arc-shaped cross-section slot 101 to cause electrode discharge to generate a high temperature, and the welding seam 2
01 side parts of the metal base material 20 on both sides are melted, and the molten steel liquid 21
Occurs. The molten steel liquid 21 is stored on the arc-shaped cross-section slot 101 of the ceramic welding backing 10. At this time, when the low melting point ceramic layer is formed on the surface of the ceramic welded backing 10, the high heat molten steel liquid 21 penetrates into the low melting point ceramic layer, and the molten steel liquid 21 becomes two metal base materials. It is filled so as to be evenly distributed in the weld seam 201 between the 20. Therefore, the ceramic welding backing 1
Using 0, the two metal base materials 20 are smoothly welded together.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a block diagram showing an example of a method for manufacturing a ceramic weld backing.

FIG. 4 is a block diagram showing another example of a method for manufacturing a ceramic welded backing.

[Explanation of symbols]

 10 Ceramic Weld Backing 101 Arc Section Slot 11 Ceramic Weld Backing 12 High Heat Resistance Adhesive Layer 13 Release Paper 14 Aluminum Foil 15 Protective Layer 20 Metal Base Metal 201 Weld Seam 21 Molten Steel Liquid P Adhesive Sheet

Claims (6)

[Claims] 1. A method for producing a ceramic weld backing, which includes the steps of forming a unglazed ceramic weld backing and forming a ceramic protective layer on the surface of the ceramic weld backing by a firing treatment. Method. 2. The method for producing a ceramic weld backing according to claim 1, wherein the surface of the ceramic weld backing is heated at 1450 to 1500 ° C. as the firing treatment. 3. The surface of the ceramic welding backing is immersed in a low melting point ceramic solution for coating as the firing treatment, and then the surface of the ceramic welding backing is heated.
Manufacturing method of ceramic welded backing. 4. The ceramic welding backing according to claim 1, wherein, as the firing treatment, the surface of the ceramic welding backing is sprayed with a low melting point ceramic solution and then the surface of the ceramic welding backing is heated. Reliable manufacturing method. 5. The method for manufacturing a ceramic welding backing according to claim 3 or 4, wherein the heating is performed at a temperature of 1250 to 1300 ° C. 6. A step of preparing an adhesive sheet containing a high heat resistant adhesive layer, a release paper and an aluminum foil, a ceramic weld backing produced by the method for producing a ceramic weld backing according to claim 1. Match the arc-shaped cross-section slots formed on the upper surface of the corresponding to the welding seam between the metal base materials, peel off the release paper from the adhesive sheet, and adhere the adhesive sheet to the bottom surface of the metal base material by the high heat resistant adhesive layer. Then, the step of fixing the metal base material and the ceramic weld backing, and the step of welding the metal base material while filling the weld seam with the molten steel liquid generated by high heat, the ceramic How to use welded backing made by.