JP2020131265A - Metal plate joining structure, its method and manufacturing method of heat exchanger thereby - Google Patents

Abstract

To provide a metal plate joining structure and its method for strengthening the anticorrosive function to a continuous welding part, by excellently finishing by reducing dispersion to a width of the continuous welding part.SOLUTION: A metal plate joining structure has a side ditch on a plane carved in parallel by regulating a width of a continuous welding part along one side or one surface, a resin covering for closing the outside of the continuous welding part and a water repellent coating for protecting its surface, and prevents separation by fitting a skirt part of the resin covering to the side ditch, and doubly protects the continuous welding part by the resin covering and the water repellent coating. Its method is conducted in order by carving the side ditch on a plane (S1), fitting a welding width setting jig (S1a), forming the continuous welding part by depositing a welding material to a width regulated by the side ditch (S2), removing a welding width setting jig from the side ditch (S2a), hardening its skirt part by filling to the side ditch by closing the outside of the continuous welding part by the resin covering (S3) and performing a waterproof water repellent coating on a surface of the resin covering after hardening (S4).SELECTED DRAWING: Figure 7

Description

The present invention relates to a metal plate joint structure, a method thereof, and a method for manufacturing a heat exchanger by the present invention, and mainly relates to a metal plate joint structure having improved durability, the method thereof, and a method for manufacturing a heat exchanger by the method.

Conventionally, in this type of structure, a joint portion by welding using a welding material or a brazing material (hereinafter, simply referred to as “welding material”) (hereinafter, also simply referred to as “welding”), for example, a continuous linear shape. In the case of a welded portion (hereinafter, also referred to as "continuous welded portion"), the variation of the brazed end portion (hereinafter, also referred to as "joint end portion" or simply "end portion") of the joint portion in the width direction thereof. In order to reduce the number, there are many examples of performing grinder processing to prepare the edges after brazing. In addition, as a method of preventing corrosion such as rust that occurs in the gaps at the joint ends, there are many examples of applying anticorrosive paint.

Japanese Unexamined Patent Publication No. 10-157829

While such a grinder treatment can suppress variations in the end portions, the grinder treatment may leave scratches, which may cause new joint defects. In addition, impurities that lead to corrosion tend to accumulate at the ends due to the steps generated by the grinder treatment.

In Patent Document 1, in order to prevent defects due to such scratches and corrosion due to impurities, a method of applying an anticorrosive paint mainly on the edges is used. However, even when the anticorrosive paint is applied, the concentration of substances involved in corrosion is high, and corrosion progresses from slight scratches and poorly painted parts. In addition, the coating film may peel off due to the expansion of the gas component generated by corrosion when the liquid enters from the scratched portion.

Further, the welded portion is often formed with fine surface irregularities, which makes it difficult to paint. Therefore, as an anticorrosion measure for welded parts and brazed parts where the metal is exposed and easily becomes gaps, the usual painting method is not sufficient.

The present invention has been made to solve the above problems, and an object of the present invention is to reduce variations with respect to the width of the continuous welded portion, finish the shape in a good shape, and enhance the anticorrosion function for the continuous welded portion. It is an object of the present invention to provide a metal plate welding structure and a method thereof.

The present invention solves the above-mentioned problems, and is a metal plate welding structure in which one side or one surface forming the outer shape of a metal plate is continuously integrated with the plane of another metal plate, and the one side or one surface A side groove in which the plane is carved in parallel with the continuous welded portion to define the width of the continuous welded portion along one surface, a resin coating to be sealed to eliminate the exposed portion from the continuous welded portion, and a resin coating of the resin coating. A water-repellent coating formed to protect the surface from the external environment is provided, the hem portion of the resin coating is fitted into the side groove to prevent peeling, and the continuous welded portion is covered with the resin coating and the water-repellent coating. It is doubly protected by a coating.

According to such a metal plate joining structure, the resin coating that seals in order to eliminate the exposed portion from the continuous welded portion is prevented from peeling by fitting the hem portion into the side groove. Therefore, it is possible to prevent the surface of the resin coating from being exposed. Further, since the surface of the resin coating is double protected by a water-repellent coating formed to protect the surface from the external environment, strong protection can be achieved by eliminating a gap that exposes the continuous welded portion. As a result, the anticorrosion function of the continuous weld is strengthened.

Further, in the continuous welded portion, the welding material is prevented from diffusing by the side groove, and the width of the continuous welded portion is uniformly defined. As a result, the variation with respect to the width of the continuous welded portion is reduced, and a good finished shape can be obtained.

Further, the method is a metal plate joining method in which one side or one surface forming the outer shape of a metal plate is continuously integrated with the flat surface of another metal plate, and a continuous welded portion along the one side or one surface. A step of engraving a side groove parallel to the continuous welded portion on the plane in order to define the width of the welded portion, a step of welding a welding material to the width defined by the side groove to form the continuous welded portion, and the continuous step. A step of sealing with a resin coating to eliminate the exposed part from the welded part, filling the hem of the resin coating in the side groove and curing it, and a water-repellent coating for protecting the surface of the resin coating from the external environment. The continuous welded portion is doubly protected by the resin coating and the water-repellent coating. According to this metal plate joining method, the same action and effect as the metal plate joining structure can be obtained.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a metal plate joining structure and a method thereof that reduce variations in the width of a continuous welded portion, finish the shape in a good shape, and enhance the anticorrosion function for the continuous welded portion.

It is sectional drawing of the metal plate joint structure (hereinafter, also referred to as "this structure") which concerns on Example 1 of this invention, and the partially enlarged view of the main part is also attached. It is explanatory drawing of the formation process by the metal plate joining method (hereinafter, also referred to as "the present method") which concerns on Example 2 of this invention. It is explanatory drawing of the metal plate joint structure (hereinafter, also referred to as "premise structure") which is a prerequisite technique of this invention, FIG. 3 (a) is a sectional view, and FIG. 3 (b) is a plan view. .. It is explanatory drawing of the metal plate joint structure (also referred to as "this structure") which concerns on Example 2 of this invention, FIG. 4A shows a sectional view, and FIG. 4B shows a plan view. .. It is an enlarged sectional view of the main part of the metal plate joint structure (also referred to as "this structure") which concerns on Example 3 of this invention. It is an enlarged sectional view of the main part of the metal plate joint structure (also referred to as "this structure") which concerns on Example 4 of this invention. It is a flowchart which shows the procedure of this method, FIG. 7A shows the method of Example 2 described in FIG. 2, and FIG. 7B shows the method of Example 1 described in FIG. There is.

Hereinafter, examples of the present invention will be described with reference to the drawings. It should be noted that the same components are given the same names and reference numerals throughout the drawings for explaining the embodiments to avoid duplication of description. In addition, this structure, this method, and the radiator to which they are applied can reduce the variation with respect to the width of the continuous welded part, finish it in a good shape, and enhance the anticorrosion function for the continuous welded part to extend the life. It is what was done. It should be noted that the cause of corrosion is splashes of water, detergent, etc. that infiltrate through gaps such as exposed portions and coatings of continuous welded portions, and the function of enhancing the protective function against these is disclosed.

FIG. 1 is a cross-sectional view of the metal plate joint structure (this structure) according to the first embodiment of the present invention, and an enlarged partial view taken out by enclosing the main part with a broken line is also attached. The structure 1 shown in FIG. 1 shows an example applied to a heat radiating device (hereinafter, also referred to as “the device” which also serves as a reference numeral) 1. The device 1 will be described so that the joint structure between the heat radiation fin (“metal plate” in the present invention) 5 and the base material (also “metal plate” in the present invention) 3 can be specified.

In this device 1, in order to efficiently dissipate heat and cool a heating element (not shown), a large number of heat radiation fins 5 are planted on a base material 3 which is directly attached to the heating element in order to reduce thermal resistance. It was set up. As described above, the present device 1 is a structure in which a plurality of metal members are welded into a well-ventilated shape and integrated in order to increase the surface area and improve the heat exchange efficiency.

The structure 1 shown in FIG. 1 has a side groove 2 in a joint portion 3 formed by welding using a welding material, for example, a joint end portion 4'in a continuous linear welded portion (continuous welded portion) 4. The joint portion 4 is formed with a resin (for example, epoxy resin) or the like to form a coating layer 6, and the coating layer is formed following the end portion 4'and the side groove 2 and can be filled in the side groove 2.

The resin coating 6 seals the outside of the continuous welded portion 4 in order to eliminate the exposed portion from the continuous welded portion 4. The water-repellent coating 7 is formed on the surface of the resin coating 6 for waterproofing. Without such protection, the continuous weld 4 gradually deteriorates due to aged deterioration, chemical action by wind and snow, rainwater, corrosive cleaning liquid, or the like, or electrolytic corrosion.

In order to suppress this deterioration and prolong the life, the outside of the continuous welded portion 4 is sealed and protected by the resin coating 6. However, due to the same cause, the resin coating 6 also deteriorates over time and cracks or deforms, so that it tends to peel off from the hem. When the resin coating 6 is peeled off, the protective function against the continuous welded portion 4 is lost due to the above-mentioned chemical stress.

Therefore, the resin coating 6 that protects the surface of the continuous welded portion 4 is prevented from peeling by fitting the hem portion into the side groove 2. Therefore, it is possible to prevent the surface of the resin coating 6 from being exposed. Further, since the surface thereof is doubly protected by the water-repellent coating 7, it is possible to strongly protect the surface by eliminating a gap that exposes the continuous welded portion 4. As a result, the anticorrosion function of the continuous welded portion 4 is strengthened.

Further, the widths 4a and 4b of the continuous welded portion 4 are defined because the side grooves 2 prevent the diffusion of the welding material. As a result, the variation in the widths 4a and 4b of the continuous welded portion 4 is reduced, and a good finished shape can be obtained.

FIG. 2 is an explanatory diagram of a forming process by the metal plate joining method (the present method) according to the second embodiment of the present invention. As shown in FIG. 2A, this structure 1 is used to efficiently dissipate heat from a heating element, for example, a heat radiation fin forming a continuous joint 4 with a base material 3 attached to a heating element (not shown). This device is formed in 5. The position where the base material 3 and the heat radiation fin 5 are joined is determined, and a portion where the welding material diffuses from the end portion of the heat radiation fin 5 during welding and becomes the welding end portion 4'is set.

A side groove 2 having a constant width and depth is formed from the set weld end. A joint material diffusion prevention jig (hereinafter, also referred to as "welding width setting jig" or simply "jig") 2'is installed in the side groove 2 shown in FIG. 2 (b), and welding is performed using the welding material. To form a continuous joint 4. After welding, as shown in FIG. 2C, the joint material diffusion prevention jig 2'is removed from the side groove 2. After that, as shown in FIG. 2D, a coating layer 6 is formed on the joint portion 4 by the resin coating 6, and the coating layer is formed following the joint end portion 4'and the side groove 2 to form a base metal side groove. Fill. Further, after forming the coating layer 6 made of resin, the coating layer 7 having a water-repellent function such as water is formed.

Note that FIGS. 2 (a) to 2 (e) correspond to steps S1 to S4 described later with reference to FIG. 7. 2 (a) is step S1, FIG. 2 (b) is step S1a and step S2, FIG. 2 (c) is step S2a, FIG. 2 (d) is step S3, and FIG. 2 (e) is step S4. It corresponds.

Here, steps S1 to S4 of this method will be briefly described. That is, in this method, a side groove is carved on a flat surface (S1), a welding width setting jig is fitted (S1a), and a welding material is welded to a width defined by the side groove to form a continuous welded portion. (S2), the welding width setting jig is removed from the side groove (S2a), the outside of the continuous welded portion is sealed with a resin coating, the hem portion is filled in the side groove and cured (S3), and the cured resin coating is performed. A water-repellent coating for waterproofing is applied to the surface of the (S4).

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a metal plate joining structure and a method thereof that reduce variations in the width of a continuous welded portion, finish the shape in a good shape, and enhance the anticorrosion function for the continuous welded portion. More specifically, it is possible to provide a structure and a method for preventing joint defects due to variations in welded portions. That is, it is possible to provide a structure that prevents corrosion of welded portions between members even when exposed to rainwater, water droplets, sprays, or the like in an outside air corrosion environment.

[Prerequisite technology]
3A and 3B are explanatory views of a metal plate joint structure (premise structure) which is a prerequisite technique of the present invention, FIG. 3A is a cross-sectional view, and FIG. 3B is a plan view. In the premise structure shown in FIG. 3, one side or one surface forming the outer shape of the heat radiation fin 5 made of a metal plate is orthogonal to the plane of the base material 3 made of another metal plate to form a continuous welded portion, which is continuously integrated. It is welded to make it.

In the premise structure of FIG. 3, it is desirable that the widths 4a and 4b of the continuous welded portion are uniform as an industrial product. That is, from the viewpoints of joint strength, durability, saving of welding material, appearance, etc. required for industrial products, it is ideal that the widths 4a and 4b of the continuous welded portion 4 are uniformly linear.

However, if the widths 4a and 4b of the continuous welded portion 4 are not uniform and have undulating variations that make them look unattractive when viewed in a plan view as shown in FIG. 3B, the above-mentioned industrial products are required. Cannot meet the requirements. With respect to the widths 4a and 4b referred to here, when viewed in cross section as shown in FIG. 3A, the width 4a on the left side is wider and thicker than the width 4b on the right side, and is built-up welding. ) Has been done.

In addition, overlay welding means welding a metal having a required composition according to the purpose to the surface of the base material to the required dimensions (width and thickness) by welding. The purpose is mainly to improve performance such as corrosion resistance or wear resistance, and to repair parts damaged by corrosion or wear. From this point of view, the width 4a on the left side in FIG. 3A, which is widely and thickly overlaid, is more advantageous in terms of joint strength and durability than the width 4b on the right side, which is narrowly and thinly overlaid. Is.

Further, as a matter of course, from the viewpoint of saving welding material and appearance, it is ideal that the left and right widths 4a and 4b are uniformly linear. It is extremely difficult to maintain such build-up welding in good quality by human manual work, not by automatic welding. Therefore, by adopting the above-mentioned method described with reference to FIG. 2 in addition to the present structure 1 of FIG. 1, it is possible to maintain good quality manually by humans.

As described above, in the present structure 1, the resin coating 6 is applied to the joint portion, and the resin coating 6 is continuously applied and filled up to the portion of the base metal side groove, so that the structure 1 is exposed to rainwater, water droplets, splashes, etc. in an outside air corrosion environment. Even if there is, it is possible to prevent corrosion of the welded portion between the members.

Further, in the present structure 1, even if the resin coating 6 is thickly provided so that the welded material is not exposed due to scratches or the like, the hem portion of the resin coating 6 fills the side grooves 2 so that the joint portions are separated from each other. Adhesive performance can be improved, and peeling of the resin coating 6 can be suppressed. As a result, it is possible to prevent crevice corrosion of the joint even when the joint is poorly joined due to width variation in the continuous weld such as brazing or welding and is exposed to the outside air corrosion environment.

4A and 4B are explanatory views of a metal plate joint structure (also referred to as “the present structure”) according to a second embodiment of the present invention, FIG. 4A is a cross-sectional view, and FIG. 4B is a plan view. Each is shown. As shown in FIG. 4B, the welding width setting jig 2'is fitted into the side groove 2 carved in the base metal 3. This jig 2'is a thin plate or a square rod-shaped member that can be partially fitted into the side groove 2, and is not welded while being fitted, and can be easily removed after the continuous welded portion 4 is formed.

For ease of explanation, if the jig 2'is a thin plate, the 1/3 position in the width direction is fitted into the side groove 2, and the remaining 2/3 position is erected substantially vertically. In this way, the jig 2'planted in the side groove 2 of the base material 3 prevents the welded material in the molten state from diffusing indefinitely in front of the side groove 2. As a result, the widths 4a and 4b of the continuous welded portion 4 are formed uniformly and linearly.

That is, due to the jig 2'fitted in the side groove 2 and temporarily planted, the widths 4a and 4b of the continuous welded portion 4 are such that the welding material to be diffused from the base of the heat radiation fin 5 stays at the same position. Welding is performed and overlay welding is performed uniformly with the same widths 4a and 4b. After the continuous weld 4 is formed, the jig 2'is easily removed.

Further, in FIG. 3 (a) which is a cross-sectional view of the premise device and FIG. 4 (a) which is a cross-sectional view of this device, the widths 4a and 4b of the continuous welded portion 4 in both are compared. In these comparisons, it can be expected that the widths 4a and 4b of the continuous welded portion 4 can be formed more uniformly in FIG. 4A than in FIG. 3A. Further, by forming the widths 4a and 4b of the continuous welded portion 4 evenly, it is possible to prevent stress concentration under the assumed load. As a result, defects in the continuous welded end 4 can be reduced. Further, the side groove 2 has an effect of reducing the amount of deformation on the base material 3 side with respect to the assumed load as compared with the case where the side groove 2 is not provided. As a result, a stress reduction effect can be expected.

Further, as shown in FIG. 2D, the effect of Example 2 of the present invention is that the continuous joint portion 4 is coated with the resin coating 6 and continuously applied / filled up to the portion of the side groove 2 to create an outside air corrosion environment. Even when exposed to rainwater, water droplets, splashes, etc., it is possible to prevent corrosion of the welded portions and the continuous welded portions 4 between the members.

Further, even if the resin coating 6 is thickly provided so that the continuous welding is not exposed due to scratches or the like, the adhesive performance between the joint portions can be improved by filling the side grooves 2 with the ends of the resin coating 6. , The peeling of the resin coating 6 can be suppressed. Further, it can be expected that the occurrence of corrosion can be prevented by forming the coating layer 7 having a water-repellent function.

In the present methods of FIGS. 2 and 4, in order to prevent the resin coating 6 from peeling off, the hem portion of the resin coating 6 having a high possibility of peeling is fitted into the side groove 2 to prevent the resin coating 6 from peeling off. As a result, the sealing effect on the outside of the continuous welded portion 4 is considerably increased. Further, the resin coating 6 has a life-prolonging measure for itself, and a water-repellent coating 7 is applied. As a result, the continuous welded portion 4 is doubly protected by the resin coating 6 and the water repellent coating 7. As a result, according to this method, the life extension effect of the continuous welded portion 4 can be remarkably enhanced.

FIG. 5 is an enlarged cross-sectional view of a main part of the metal plate joint structure (also referred to as “this structure”) according to the third embodiment of the present invention. As shown in FIG. 5, this structure includes a device 3 used to efficiently dissipate heat from a heating element (not shown) and cool the heating element, for example, a base material 3 for attaching a heat radiation fin 5 to the heating element. It is the structure at the joint of.

In the joint portion 4 such as welding or continuous welding shown in FIG. 5, a side groove 2a is provided in the base material 3 of the portion to be the joint end portion 4', and the joint portion 4 is coated with a resin coating 6 to form a coating layer 6 and coated. The layer is formed following the joint end portion 4'and the side groove 2a, and is characterized by a structure capable of filling the base metal side groove. Further, the width of the side groove 2a in FIG. 5 forms a wider groove width in the lower portion in the depth direction than in the upper portion in the depth direction. As a result, an anchor effect can be obtained as compared with the case where the width of the groove is the same in the upper part and the lower part, and it can be expected that the resin coating 6 is prevented from peeling due to the improvement of the adhesive performance between the joint portions.

FIG. 6 is an enlarged cross-sectional view of a main part of the metal plate joint structure (also referred to as “this structure”) according to the fourth embodiment of the present invention. As shown in FIG. 6, this structure is a structure at a joint portion between a heating element (not shown) and a base material 3 for attaching a heating element (not shown), for example, a device used for efficiently dissipating heat from a heating element. is there.

In the continuous welded portion 4 shown in FIG. 6, a side groove 2b is provided in the base material 3 of the portion to be the joint end portion 4', and the joint portion 4 is coated with the resin to form the coating layer 6, and the coating layer is the joint end portion. It is characterized by a structure formed following the portion 4'and the side groove 2b and capable of filling the base metal side groove. Further, the width of the base metal side groove in FIG. 6 is wider in the lower part in the depth direction than in the upper part in the depth direction, and a deep groove 8 having a V-shaped cross section is formed at the bottom of the groove. As a result, an anchor effect can be obtained as compared with the case where the width of the groove is the same in the upper part and the lower part, and it can be expected that the resin coating 6 is prevented from peeling due to the improvement of the adhesive performance between the joint portions.

7A and 7B are flowcharts showing the procedure of this method. FIG. 7A shows the method of Example 2 described in FIG. 2, and FIG. 7B shows the method of Example 1 described in FIG. Each is shown. As shown in FIG. 7, this method is executed in the order of steps S1 to S4.

In particular, in this method shown in FIG. 7A, a step S1 for engraving a side groove on a flat surface, a step S1a for fitting a welding width setting jig, and a welding material are welded to a width defined by the side groove. Step S2 for forming the continuous welded portion, step S2a for removing the welding width setting jig from the side groove, and step S3 for sealing the outside of the continuous welded portion with a resin coating and filling the hem portion in the side groove to cure. And step S4 in which a water-repellent coating for waterproofing is applied to the surface of the resin coating after curing.

Steps S1 to S4 of FIG. 7 (a) correspond to FIGS. 2 (a) to 2 (e). That is, step S1 is FIG. 2A, steps S1a and S2 are FIG. 2B, step S2a is FIG. 2C, step S3 is FIG. 2D, and step S4 is FIG. 2E. Corresponds to each. Further, as shown in FIG. 7B, the method of the first embodiment described with reference to FIG. 1 is completed by removing steps S1a and S2a from the procedures of steps S1 to S4 of FIG.

Hereinafter, the main points of the present invention will be described along with the scope of claims.
[1] As shown in FIG. 1 of the first embodiment, the present structure 1 is a metal plate joint in which one side or one surface forming the outer shape of the metal plate 5 is continuously integrated with the flat surface of the other metal plate 3. Structure 1. The structure 1 is configured to include a side groove 2, a resin coating 6, and a water-repellent coating 7. The side grooves 2 are carved in parallel along the continuous welded portions 4 in order to define the widths 4a and 4b of the continuous welded portions 4 formed on the plane.

The resin coating 6 that is sealed to eliminate the exposed portion from the continuous welded portion 4 is prevented from peeling by fitting the hem portion into the side groove 2. Therefore, it is possible to prevent the surface of the resin coating 6 from being exposed. Further, since the surface of the resin coating 6 is doubly protected by the water-repellent coating 7 formed to protect the surface from the external environment, strong protection can be achieved by eliminating a gap that exposes the continuous welded portion 4. As a result, the anticorrosion function of the continuous welded portion 4 is strengthened.

Further, the widths 4a and 4b of the continuous welded portion 4 are defined because the side grooves 2 prevent the diffusion of the welding material. As a result, the variation in the widths 4a and 4b of the continuous welded portion 4 is reduced, and a good finished shape can be obtained.

[2] Further, as shown in FIG. 5 of Example 3, it is preferable that the width of the side groove 2a is wider than the opening. According to this, the resin coating 6 filled in the side groove 2a is cured in relation to the molding material with respect to the molding die so as to match the internal shape of the side groove 2a. If it is a general relationship between a molding die and a molding material, the opening is designed to be larger than the inner part so that the molded product after curing can be easily released from the mold. On the contrary, in the present structure 1, since the inner portion is formed larger than the opening, the resin coating 6 is hard to come off from the side groove 2a after curing.

As described above, since the resin coating 6 of the present structure 1 has an anchor effect that makes it difficult to come off from the coated partner, it is difficult to peel off for a long period of time. The anchor effect refers to an effect in which the adhesive is hardened by entering into the fine irregularities on the surface of the material like the roots of a tree in bonding or painting, thereby increasing the adhesive force. This anchor effect is also called an anchor effect or a fastener effect.

[3] Further, as shown in FIG. 6 of the fourth embodiment, it is preferable to form the anchor groove 8 so that the cross section of the inner portion of the side groove 2b increases in depth in the radial direction because the anchor effect is enhanced.
[4] Further, as shown in FIG. 6 of Example 4, it is preferable to form the anchor groove 8 so that the cross section of the inner portion of the side groove 2b draws a part of a star shape because the anchor effect is further enhanced. ..

[5] Further, as shown in Example 1, Example 2, FIG. 1, FIG. 3 and FIG. 4, the present invention has the metal plate joint structure according to any one of the above [1] to [4]. It is also specified as a heat exchanger 1 provided with 1. Generally, the heat exchanger 1 is configured by connecting a large number of fins at equal intervals for the purpose of increasing the surface area. Further, in the heat exchanger 1, the contact between the fluid and the fins is large and takes a long time. It may also be washed with a corrosive detergent.

As described above, in the heat exchanger 1 for the purpose of being easily corroded, it is a requirement to extend the life of the continuous welded portion 4 to be improved in waterproofness. Therefore, the structure 1 in which the corrosion resistance of the continuous welded portion 4 is enhanced contributes to prolonging the life of the heat exchanger 1. In addition, the variation in the widths 4a and 4b of the continuous welded portion 4 is reduced, and a good finished shape can be obtained, which also enhances the quality such as the strength of the heat exchanger 1 to which the present structure 1 is applied and prolongs the life. Connect.

[6] This method for realizing the present configuration of the first embodiment will be described. Here, in addition to the present configuration and the present method, FIG. 2 of the second embodiment including other requirements will be described. This method is a metal plate joining method in which one side or one surface forming the outer shape of the metal plate 5 is continuously integrated with the flat surface of the other metal plate 3.

The method includes steps S1 to S4. First, in step S1, in order to define the widths 4a and 4b of the continuous welded portion 4 along one side or one surface, a side groove 2 parallel to the continuous welded portion 4 is carved on a flat surface. Next, in step S2, the welding material is welded to the widths 4a and 4b defined by the side grooves 2 to form the continuous welded portion 4. Next, in step S3, the outside of the continuous welded portion 4 is sealed with the resin coating 6, and the hem portion of the resin coating 6 is filled in the side groove 2 to be cured. Next, in step S4, a waterproof water-repellent coating 7 is applied to the surface of the cured resin coating 6.

In this method, the continuous welded portion 4 is doubly protected by the resin coating 6 and the water repellent coating 7 in steps S1 to S4. As a result, the same action and effect as in [1] can be obtained.

[7] Further, as shown in FIG. 2 of Example 2, it is preferable to add step S1a and step S2a in this method. In step S1a, the welding width setting jig 2'is fitted into the side groove 2 after step S1 in which the side groove 2 is engraved (S1a). The welding width setting jig 2'is a thin plate or a square rod-shaped member that can be fitted and removed from the side groove 2 and is made of a material that is not welded.

Next, the continuous welded portion 4 is formed in step S2. At this time, the welding width setting jig 2'of the rod-shaped member prevents the molten welding material from spreading unnecessarily and randomly and filling up to the side groove 2. As a result, the widths 4a and 4b of the continuous welded portion 4 are limited to positions in front of the edge of the side groove 2.

After that, in step S2a, when the welding width setting jig 2'is removed from the side groove 2, the inner surface of the side groove 2 not filled with the welding material is exposed as it is engraved. Next, in step S3, the outside of the continuous welded portion 4 is sealed with the resin coating 6, and the hem portion of the resin coating 6 is filled in the side groove 2 to be cured. As described above, since the inner surface of the side groove 2 is in the as-engraved state, the resin coating 6 is filled to the deep part thereof.

As described above, in this method, by adding step S1a and step S2a, respectively, the widths 4a and 4b of the continuous welded portion 4 are limited to positions in front of the edge of the side groove 2. Therefore, the effect of reducing the variation in the widths 4a and 4b of the continuous welded portion 4 is enhanced. As a result, a better finished shape can be obtained.

[8] As shown in Example 1, Example 2, FIG. 1 and FIG. 4, the present invention is a method for manufacturing the heat exchanger 1 by the metal plate joining method according to the above [6] or [7]. Is also identified. This also has substantially the same action and effect as the heat exchanger 1 of the above [5].

1 This device (heat exchanger) to which the metal plate joining structure (this structure) is applied, 2, 2a side groove, 2'welding width setting jig (jig), 3 Other metal plates (base material of heat exchanger 1) ), 4 continuous welded part (continuous continuous welded part), 4a, 4b (continuous welded part 4) width, 5 (heat exchanger 1 heat dissipation fin) metal plate, 6 resin coating (coating layer / filling part), 7 Water repellent coating, 8 anchor grooves (deep groove with V-shaped cross section)

Claims (8)

A metal plate joint structure in which one side or one surface forming the outer shape of a metal plate is continuously integrated with the flat surface of another metal plate.
A side groove in which the plane is carved in parallel with the continuous welded portion in order to define the width of the continuous welded portion along one side or one surface.
A resin coating that seals to eliminate exposed parts from the continuous welded part,
A water-repellent coating formed to protect the surface of the resin coating from the external environment,
With
The hem of the resin coating is fitted into the side groove to prevent peeling.
The continuous welded portion was doubly protected by the resin coating and the water repellent coating.
Metal plate joint structure. The width of the side groove forms a deeper part than the opening.
The metal plate joint structure according to claim 1. The side groove forms an anchor groove having an increased depth in the radial direction in the cross section of the inner portion.
The metal plate joining structure according to claim 2. The anchor groove was formed so as to form a part of a star-shaped cross section at the inner portion of the side groove.
The metal plate joining structure according to claim 3. A heat exchanger having the metal plate joining structure according to any one of claims 1 to 4. A metal plate joining method in which one side or one surface forming the outer shape of a metal plate is continuously integrated with the flat surface of another metal plate.
A step of engraving a side groove parallel to the continuous welded portion on the plane in order to define the width of the continuous welded portion along the one side or one surface.
The step of welding the welding material to the width specified by the side groove to form the continuous welded portion, and
A step of sealing with a resin coating to eliminate the exposed portion from the continuous welded portion, and filling the side groove with the hem portion of the resin coating to cure the side groove.
A step of applying a water-repellent coating to protect the surface of the resin coating from the external environment,
Have,
The continuous welded portion was doubly protected by the resin coating and the water repellent coating.
Metal plate joining method. After the step in which the gutter was carved,
A step of fitting a welding width setting jig using a thin plate or a square rod-shaped member that is not welded to the side groove and can be removed.
After the step in which the continuous weld was formed
The step of removing the welding width setting jig from the side groove,
By adding the above, the width of the continuous welded portion is limited to a position in front of the edge of the side groove.
The metal plate joining method according to claim 6. A method for manufacturing a heat exchanger by the metal plate joining method according to claim 6 or 7.