JP2018030141A - Welding method of thin copper sheet, welding device of thin copper sheet, and manufacturing method of drain for waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method of a thin copper sheet capable of performing TIG welding to the thin copper sheet without causing thermal expansion or oxidation; and to provide a welding device of the thin copper sheet, and a manufacturing method of a drain for waste water.SOLUTION: There is provided a welding method of a thin copper sheet for welding a peripheral edge part 11 of a hole part 10 of a copper flat plate 1 having the circular hole part 10 to the end 21 on one side of a cylindrical copper tube 2. In the welding method of the thin copper sheet, the copper flat plate 1 on the periphery 10a of the peripheral edge of the hole part 10 is sandwiched by an upper jig 31 and a lower jig 32 with a constant sandwiching pressure, and TIG welding is performed, while releasing excessive weld heat generated during welding.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a thin copper plate welding method, a thin copper plate welding apparatus, and a drain for drainage, and more specifically, a thin copper plate welding method for welding a copper flat plate and a copper pipe by TIG welding, a thin copper plate welding apparatus, and It is related with the drainage drain manufactured by it.

As welding methods for melting and joining base materials to each other, arc welding, gas welding, electron beam welding, laser welding, and the like are known.
Among them, arc welding is most commonly performed to connect metals using an electric discharge phenomenon (arc discharge) in the air.
Further, among arc welding, TIG welding (TIG welding), which is a relatively simple method in which sparks are not scattered during welding, has attracted attention. TIG welding is a welding method in which an arc is emitted from a tungsten rod while blowing an inert gas (shield gas) such as argon or helium, and the base material is melted by the heat.
TIG welding has the advantage that high-quality and beautiful welding beads (welding marks) can be obtained, and can be applied to welding of various metals, so it is mainly used for welding of stainless steel, aluminum, etc. .

  As a specific example, when a stainless steel base material is butt welded in a predetermined groove shape, a TIG is applied after applying a penetration accelerator formed by mixing a metal oxide powder and a solvent to the surface of the stainless steel base material. Welding methods for welding (for example, see Patent Document 1), welding methods for fixing a steel pipe pipe having a thickness of 3 mm or more and TIG welding of the surroundings (for example, see Patent Document 2), cylindrical or flat plates with a predetermined plate thickness A welding method (for example, refer to Patent Document 3) is known in which bead joints are formed by laser welding and TIG welding from both the front and back surfaces of a steel material at the edge of the steel material.

  In addition, as a product manufactured by welding, for example, a cylindrical pipe member that is fitted inside a drain pipe and a gutter member that is formed so as to spread radially in the upper part of the pipe member are used. There is known a repair drain in which a member and a gutter member are integrated by melting them with lead (for example, see Patent Document 4).

JP 2000-102890 A JP 2011-177769 A Japanese Patent Laying-Open No. 2015-164737 Japanese Patent No. 4405473

However, the welding methods described in Patent Documents 1 to 3 use steel, and the repair drain described in Patent Document 4 uses lead, both of which use a copper plate. is not.
In addition, unlike a steel material, a copper plate is sensitive to heat. Therefore, it is difficult to replace the steel material with a copper plate and perform welding using the above-described welding method. That is, when TIG welding is performed using a copper plate, if welding heat is continuously applied to the copper plate for a long time, even if it is shielded with a shielding gas, excess welding heat is transferred to the copper plate, causing thermal expansion and oxidation. There is a risk of causing. This is more noticeable when the copper plate is a thin copper plate (hereinafter referred to as “thin copper plate”).
For these reasons, TIG welding using a thin copper plate is extremely difficult, and products produced by welding thin copper plates also tend to be inferior in quality.

  The present invention has been made in view of the above circumstances, and has a thin copper plate welding method, thin copper plate welding apparatus, and drainage that can perform TIG welding on a thin copper plate without causing thermal expansion or oxidation. The purpose is to provide drainage.

  The present inventor has intensively studied in order to solve the above-mentioned problems. As a result, the copper flat plate near the periphery of the hole is sandwiched between the upper jig and the lower jig so as to have a constant narrow pressure, and is welded. The present inventors have found that the above-mentioned problems can be solved by performing TIG welding while releasing excess welding heat generated, and have completed the present invention.

  The present invention is (1) a method for welding a thin copper plate that welds a peripheral portion of a hole portion of a copper flat plate having a circular hole portion and an end portion on one side of a cylindrical copper tube, A thin copper plate welding method in which a copper flat plate in the vicinity of the periphery is sandwiched by an upper jig and a lower jig so as to have a constant narrow pressure, and TIG welding is performed while releasing excess welding heat generated during welding. .

This invention exists in the welding method of the thin copper plate of the said (1) description whose (2) narrow pressure is 200 kgf / cm < ² > or more.

  The present invention resides in (3) the thin copper plate welding method according to the above (1) or (2), wherein the upper jig or the lower jig releases excess welding heat.

  This invention exists in the welding method of the thin copper plate of the said (3) description to which (4) an upper jig or a lower jig consists of iron materials.

  In the present invention, (5) any one of the above (1) to (4), wherein the lower jig is an annular body having a flat upper surface, and a copper tube can be inserted inside the lower jig. It exists in the welding method of the thin copper plate as described in one.

  In the present invention, (6) the upper jig is composed of a plate-like body and a contact portion provided on the lower surface of the plate-like body, and the lower surface of the contact portion is flat and integrated. The plate-like body and the contact portion have a semicircular cut-out portion along the shape of the copper tube, and the end on the cut-out portion side of the plate-like body is tapered. It exists in the welding method of the thin copper plate as described in any one of (5).

  This invention exists in the welding method of the thin copper plate of the said (6) description that the distance of the clearance gap between a copper pipe and a notch part periphery is 2 mm-6 mm.

  This invention exists in the drain for drainage manufactured by the welding method as described in any one of (8) said (1)-(7).

  The present invention is (9) a thin copper plate welding apparatus for welding a peripheral portion of a hole portion of a copper flat plate having a circular hole portion and an end portion on one side of a cylindrical copper tube, An upper jig and a lower jig for sandwiching a copper flat plate in the vicinity of the peripheral edge of the part so as to be a constant narrow pressure, a base on which a circular hole is formed to which the lower jig is fitted, and a circular hole periphery An annular support block fixed to the lower surface of the base with a fixture, an annular elastic block fitted on the inner peripheral wall of the support block, and an annular contact abutted against the lower surface of the support block and the elastic block Plate and an annular fixed block fixed to the support block with a fixture via the contact plate, and when the copper plate is placed on the upper surface of the base and the lower jig, the upper surface of the lower jig is A thin copper plate welding device that is flush with the upper surface of the base and whose lower jig is urged upward by an elastic block Exist for.

In the welding method of the thin copper plate according to the present invention, when TIG welding the peripheral portion of the hole portion of the copper flat plate and the end portion on one side of the copper pipe, And it can suppress that a copper flat plate deform | transforms by pinching so that it may become a fixed narrow pressure with a lower jig | tool. In addition, since the cross section of a copper pipe is circular, it is a structure which is hard to deform | transform from the first.
At the same time, it is possible to prevent the thin copper plate from being oxidized as much as possible by releasing excess welding heat generated during welding.

At this time, if the upper jig or the lower jig releases excess welding heat, that is, if the upper jig or the lower jig transmits extra welding heat to another, the copper plate is cured. By sandwiching between the tool and the lower jig, a constant narrow pressure can be applied, and at the same time, excess welding heat can be released. For this reason, it becomes possible to perform TIG welding of a thin copper plate in an extremely simple state.
In addition, it is preferable that an upper jig or a lower jig consists of iron materials. In this case, excess welding heat applied to the thin copper plate can be effectively released.

In the thin copper plate welding method of the present invention, the deformation of the copper flat plate can be sufficiently suppressed by setting the narrow pressure to 200 kgf / cm ² or more.
If the upper jig or the lower jig releases excess welding heat, the efficiency of releasing (efficiency in conducting excess welding heat) is further improved by setting the narrow pressure to 200 kgf / cm ² or more. To do.

  In the thin copper plate welding method of the present invention, since the copper tube can be inserted inside the lower jig, the lower jig is surely brought into contact with a specific position near the peripheral edge of the hole of the copper flat plate. It becomes possible to make it.

In the welding method of the thin copper plate of the present invention, the upper jig is composed of a plate-like body and a contact portion provided on the lower surface of the plate-like body, and the lower surface of the contact portion is flat, Since the integrated plate-like body and the abutting part have a semicircular cutout along the shape of the copper tube, welding is performed with the upper jig close to the circumferential direction of the copper tube. can do.
Moreover, since the edge part by the side of the notch part of a plate-shaped body is taper shape, it can suppress that it is heated directly by the arc discharge | released from a tungsten rod.
At this time, it is preferable that the distance of the clearance gap between a copper pipe and a notch part periphery is 2 mm-6 mm. In this case, the deformation of the copper flat plate can be sufficiently suppressed by the upper jig or the lower jig.
Further, when the upper jig or the lower jig releases excess welding heat, it is extremely effective because only the unnecessary welding heat can be released without releasing necessary welding heat.

  Since the drain for drainage of the present invention is produced by the above-described copper welding method, TIG welding can be performed on a thin copper plate without causing thermal expansion or oxidation. Thereby, the drain for drainage which is sufficiently excellent in quality can be obtained.

According to the welding apparatus for a thin copper plate of the present invention, TIG welding can be performed on the thin copper plate without causing thermal expansion or oxidation.
In addition, when the copper flat plate is placed on the upper surfaces of the base and the lower jig, the upper surface of the lower jig is flush with the upper surface of the base and is urged upward by the elastic block. When the upper jig or the copper flat plate is removed after welding, the lower jig is pushed upward by the elastic force of the elastic block. For this reason, it is easy to remove the lower jig.

(A) of FIG. 1 is a top view which shows the copper flat plate used for the welding method of the thin copper plate which concerns on this embodiment, (b) is sectional drawing cut | disconnected by the AA line of (a). . (A) of FIG. 2 is a perspective view which shows the copper pipe used for the welding method of the thin copper plate which concerns on this embodiment, (b) is sectional drawing cut | disconnected by the BB line of (a). . FIG. 3A is a schematic cross-sectional view showing a part of a welding apparatus used in the thin copper plate welding method according to the present embodiment, and FIG. 3B is a thin copper plate welding method according to the present embodiment. It is a schematic sectional drawing for demonstrating the welding method using the welding apparatus. 4A is a top view showing an upper jig used in the thin copper plate welding method according to the present embodiment, and FIG. 4B is a cross-sectional view taken along line CC in FIG. is there. (A) of FIG. 5 is a top view which shows the lower jig | tool used for the welding method of the thin copper plate which concerns on this embodiment, (b) is sectional drawing cut | disconnected by the DD line of (a). is there. FIG. 6 is a perspective view showing the drain for drain according to the present embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

The thin copper plate welding method according to the present invention is a method of welding a copper flat plate and a copper pipe made of a thin copper plate by TIG welding.
(A) of FIG. 1 is a top view which shows the copper flat plate used for the welding method of the thin copper plate which concerns on this embodiment, (b) is sectional drawing cut | disconnected by the AA line of (a). .
As shown to (a) and (b) of FIG. 1, the copper flat plate 1 is a thin flat plate shape, and has the circular hole part 10 in the approximate center.
In the copper flat plate 1, a peripheral edge 11 is formed on the circumference of the hole 10. The peripheral edge 11 has a structure bent so that the copper flat plate 1 rises upward from the surface, that is, rises.

Here, as the copper flat plate 1, a thin plate having a thickness H1 of 0.3 mm to 1 mm is preferably used.
Moreover, the kind of the copper flat plate 1 used will not be specifically limited if copper is a main component and it is deoxidized. Specifically, an oxygen-free copper plate, a phosphorus deoxidized copper plate, etc. are mentioned. In addition, the copper flat plate 1 may consist of alloys containing metals other than copper, such as a phosphor bronze plate.

(A) of FIG. 2 is a perspective view which shows the copper pipe used for the welding method of the thin copper plate which concerns on this embodiment, (b) is sectional drawing cut | disconnected by the BB line of (a). .
As shown in FIGS. 2A and 2B, the copper tube 2 is a thin plate formed into a cylindrical shape, and the inside is hollow. The outer diameter of the copper tube 2 and the diameter of the hole 10 described above are substantially the same size.
The end 21 on one side of the copper tube 2 has a structure in which the diameter is larger than the other part of the copper tube 2. That is, the end portion 21 on one side of the copper tube 2 includes a portion where the diameter of the copper tube 2 gradually increases toward the end and a portion where the diameter becomes constant thereafter.

Here, as the copper tube 2, a thin tube having a thickness H2 of 0.3 mm to 1 mm is preferably used. In addition, the thickness H1 of the copper flat plate 1 and the thickness H2 of the copper tube 2 described above may be the same or different.
Moreover, the kind of the copper tube 2 to be used is not particularly limited as long as copper is a main component and deoxygenated in the same manner as the copper flat plate 1 described above. Specifically, an oxygen-free copper pipe, a phosphorus deoxidized copper pipe, etc. are mentioned. The copper tube 2 may be made of an alloy containing a metal other than copper, such as a phosphor bronze tube.

In the thin copper plate welding method according to the present embodiment, the peripheral edge 11 of the hole 10 of the copper flat plate 1 and the end 21 on one side of the copper tube 2 are welded.
(A) of FIG. 3 is a schematic sectional drawing which shows a part of welding apparatus used for the welding method of the thin copper plate which concerns on this embodiment.
As shown in FIG. 3 (a), in the welding apparatus 100, an upper jig and a lower jig 32 (not shown) for sandwiching a copper flat plate (not shown) so as to have a constant narrow pressure, and a lower jig 32 are provided. A base 4 in which a circular hole to be fitted is formed, an annular support block 41 fixed to the lower surface of the base 4 at the periphery of the circular hole by a fixing tool, and an annular shape fitted into the inner peripheral wall of the support block 41 The elastic block 42, the support block 41, an annular contact plate 43 that is in contact with the lower surface of the elastic block 42, and an annular fixed block 44 that is fixed to the support block 41 via the contact plate 43 with a fixture. With.

In the welding apparatus 100, the lower jig 32 is fitted into the circular hole of the base 4 and is supported by the support block 41 and the elastic block 42.
Further, it is desirable not to provide a gap between the blocks so that necessary welding heat does not escape.
The support block 41 and the elastic block 42 are formed with an air flow path P which will be described later.

In the welding apparatus 100, the upper surface of the lower jig 32 protrudes upward from the upper surface of the base 4 by the height S. For this reason, when a copper flat plate is placed on the upper surface of the base 4 and the lower jig 32 and pushed down by the upper jig 31, the upper surface of the lower jig 32 is flush with the upper surface of the base 4. An upper elastic force by the elastic block 42 is urged to the lower jig 32.
Therefore, for example, when the upper jig or the copper flat plate is removed after welding, the elastic force of the elastic block 42 is released, and the lower jig 32 is pushed upward. For this reason, it is easy to remove the lower jig 32.

In the welding apparatus 100, the support block 41, the elastic block 42, the contact plate 43, and the fixed block 44 are all removable by removing the fixture.
Therefore, the lower jig 32 can be easily replaced by pushing up and removing from the lower side, and the support block 41, the elastic block 42, the contact plate 43, and the fixed block 44 can be replaced.
In addition, when welding using a copper pipe of a different size or a lower jig, the support block, the elastic block, the contact plate, and the fixed block may be replaced with ones of an appropriate size.

Further, as the base 4 and the fixed block 44, a metal material such as iron is preferably used.
As the support block 41, the elastic block 42, and the contact plate 43, a resin material such as Teflon (registered trademark) is preferably used.
Moreover, a detachable screw, pin, or the like is used as the fixture.

FIG. 3B is a schematic cross-sectional view for explaining a welding method using the welding apparatus shown in FIG. 3A in the thin copper plate welding method according to the present embodiment.
As shown in (b) of FIG. 3, in the thin copper plate welding method, first, the end portion 21 of the copper tube 2 is press-fitted into the peripheral portion 11 of the hole portion 10 of the copper flat plate 1, whereby the copper tube 2 Is mounted in the hole 10 of the copper flat plate 1. At this time, it is desirable to arrange the upper surface of the peripheral edge portion 11 facing the vertical direction of the copper flat plate 1 and the upper surface of the end portion 21 extending in the vertical direction of the copper tube 2 to be flush with each other. In this case, the weld mark becomes smooth without unevenness.

Next, the copper flat plate 1 is disposed so as to be supported by the base 4 and the lower jig 32 of the welding apparatus 100, and the copper tube 2 is inserted into a jig hole inside the lower jig 32. At this time, a gap for introducing the back shield gas from the opposite side toward the welded portion is provided between the copper tube 2 and the lower jig 32 and the elastic block 42.
Then, the copper flat plate 1 in the vicinity 10 a of the periphery of the hole 10 of the copper flat plate 1 is held by the upper jig 31 and the lower jig 32 and sandwiched so as to have a constant narrow pressure. Specifically, from a state where the copper flat plate 1 is sandwiched between the upper jig 31 and the lower jig 32, the lower jig 32 is fixed and the upper jig 31 is pressed toward the lower jig 32. Of course, a method of fixing the upper jig 31 and pressing the lower jig 32 toward the upper jig 31 or a method of pressing the upper jig 31 and the lower jig 32 to each other is naturally applicable.
At this time, the lower jig 32 described above is pushed downward by the copper flat plate 1, and the upper surface of the lower jig 32 is flush with the upper surface of the base 4.

Here, the method of applying a narrow pressure to the copper flat plate 1 with the upper jig 31 and the lower jig 32 is not particularly limited, and examples thereof include a method using a vise.
In this case, the upper surface of the upper jig 31 and the lower surface of the fixed block 44 may be held and sandwiched with a vise. As a result, the copper flat plate 1 is sandwiched between the upper jig 31 and the lower jig 32 via the fixed block 44 or the like.

In the thin copper plate welding method, as described above, the air flow path P formed in the support block 41 and the elastic block 42 passes through the gap between the copper tube 2 and the lower jig 32 and the elastic block 42. Then, spray the back shield gas from the opposite side toward the welded part.
In this state, the copper flat plate 1 and the copper tube 2 are integrated by performing TIG welding on the peripheral edge portion 11 of the copper flat plate 1 and the end portion 21 of the copper tube 2.
In addition, in the welding method of the thin copper plate which concerns on this embodiment, the position of the upper jig | tool 31 and the lower jig | tool 32 is fixed, and TIG welding is performed. For example, the copper flat plate 1 and the copper tube 2 are rotated by 90 ° with respect to the positions of the upper jig 31 and the lower jig 32, and welding is sequentially performed.

Tig welding may be performed by a known method. That is, according to the thickness of the thin copper plate, the arc emission angle emitted from the tungsten rod in TIG welding, the current magnitude, the pulse width, etc. may be adjusted as appropriate.
Even if the current in TIG welding is made as weak as possible, the thin copper plate causes thermal expansion and oxidation. For this reason, in the welding method of the thin copper plate which concerns on this embodiment, the magnitude | size of the electric current in TIG welding is not ask | required.
Similarly, the pulse width in TIG welding is not limited, but it is preferable that the arc is continuously emitted from the tungsten rod without providing a pulse width from the viewpoint of preventing thermal expansion and oxidation.

4A is a top view showing an upper jig used in the thin copper plate welding method according to the present embodiment, and FIG. 4B is a cross-sectional view taken along line CC in FIG. is there.
As shown in FIGS. 4A and 4B, the upper jig 31 includes a plate-like body 310 and a thick contact portion 312 protruding from the lower surface of the plate-like body 310. Note that the lower surface of the contact portion 312 is flat.
Further, the plate-like body 310 and the contact portion 312 have a semicircular cutout portion 31 a along the shape of the copper tube 2.
Further, the contact portion 312 is semi-annular in a bottom view so as to correspond to the shape of the lower jig 32 described later.

In the upper jig 31, the lower surface of the contact portion 312 is in direct contact with the copper flat plate 1. Therefore, the lower surface of the contact part 312 is flat.
And since the upper jig | tool 31 has the semicircle-shaped notch part 31a, it can arrange | position in the state which made the upper jig | tool 31 approached as much as possible along the circumferential direction of the copper tube 2. FIG.
By these things, in the welding method of a thin copper plate, the upper jig 31 brought close to the copper tube 2 comes into contact with the copper flat plate 1 through the contact portion 312 and further presses it partially. become.

In the upper jig 31, an end 311 of the plate-like body 310 on the side of the notch 31a has a tapered shape with the lower side protruding in the horizontal direction. For this reason, it is possible to suppress the upper jig 31 from being directly heated by escaping the arc emitted from the tungsten rod W (see FIG. 3B).
In this case, the melted portion can be easily viewed from an oblique direction, so that workability is improved.

(A) of FIG. 5 is a top view which shows the lower jig | tool used for the welding method of the thin copper plate which concerns on this embodiment, (b) is sectional drawing cut | disconnected by the DD line of (a). is there.
As shown in FIGS. 5A and 5B, the lower jig 32 has an annular shape with an inverted L-shaped vertical cross section, and has a jig hole 32a inside. As described above, the copper tube 2 is inserted into the jig hole 32a.
Further, the upper surface of the lower jig 32 is in direct contact with the copper flat plate 1. Therefore, the upper surface of the lower jig 32 is flat. That is, the copper flat plate 1 is sandwiched while being in contact with the lower surface of the contact portion 312 of the upper jig 31 and the upper surface of the lower jig 32.

In the thin copper plate welding method, since the copper tube 1 can be inserted into the jig hole 32a of the lower jig 32, the lower jig 32 is placed at a specific position near the periphery of the hole 10 of the copper flat plate 1. It is possible to ensure contact.
The position where the lower jig 32 is brought into contact with the copper flat plate 1 corresponds to the position where the contact portion 312 of the upper jig 31 is brought into contact with the copper flat plate 1.

Returning to FIG. 3B, the upper jig 31 and the lower jig 32 are preferably made of a material that releases excess welding heat generated in TIG welding. That is, it is preferable that the upper jig 31 and the lower jig 32 are made of a material having as much heat conductivity as possible.
In this case, if the upper jig 31 and the lower jig 32 are brought into contact with the copper flat plate and TIG welding is performed, excess welding heat generated when the upper jig 31 and the lower jig 32 are welded can be released. . That is, while maintaining the temperature at which the thin copper plate melts instantaneously, excess heat is released and TIG welding can be performed. As a result, the thin copper plate can be prevented from being oxidized.
Note that, as described above, the upper jig 31 has the notch portion 31a, and therefore can be as close to the copper tube 2 as possible. For this reason, excess welding heat transmitted to the copper flat plate 1 can be released along the periphery of the copper tube 2.
Moreover, since the lower jig | tool 32 is cyclic | annular, the excess welding heat transmitted to the copper flat plate 1 can be similarly released along the circumference | surroundings of the copper pipe 2. FIG.

Examples of the material of the upper jig 31 and the lower jig 32 include stainless steel, aluminum, iron, brass, and the like from the viewpoint of heat conductivity. The upper jig 31 and the lower jig 32 may be made of the same material or different materials.
Among these, the material of the upper jig 31 or the lower jig 32 is preferably made of an iron material, and the materials of the upper jig 31 and the lower jig 32 are more preferably made of an iron material.
In the upper jig 31, only the contact portion 312 may be an iron material.
When the upper jig 31 or the lower jig 32 is an iron material, heat is effectively released, so that excess welding heat applied to the thin copper plate can be effectively released. For this reason, it can suppress that a thin copper plate accumulates heat.

Here, the distance H3 of the gap between the copper tube 2 and the periphery of the notch 31a of the upper jig 31 is preferably 2 mm to 6 mm. In this case, the welding heat can be reliably released, and the speed at which the welding heat is released can be controlled by adjusting the gap distance within this range.
If the distance H3 is less than 2 mm, compared to the case where the distance H3 is within the above range, the necessary welding heat applied to the thin copper plate is also absorbed, and the thin copper plate may be prevented from melting. When H3 exceeds 6 mm, the thermal expansion and oxidation of the thin copper plate may not be sufficiently suppressed as compared with the case where the distance H3 is within the above range.

In the welding method of the thin copper plate, clamping force that the upper jig 31 and the lower jig 32 is applied to the copper plate 1 is preferably at 200 kgf / cm ² or more, and more preferably 230 kgf / cm ² or more.
In this case, the thermal expansion of the copper flat plate 1 due to welding heat can be sufficiently suppressed.
Further, the copper plate 1 is strongly sandwiched between the upper jig 31 and the lower jig 32 with a narrow pressure of 200 kgf / cm ² or more, so that excess welding heat can easily flow into the upper jig 31 and the lower jig 32. it can.

Therefore, in the thin copper plate welding method according to the present embodiment, the upper jig 31 or the lower jig 32 is made of a material that releases excess welding heat, and the copper flat plate 1 is attached to the upper jig. Tig welding can be performed while releasing excess welding heat generated during welding by setting the pin 31 and the lower jig 32 to be strongly sandwiched.
Therefore, according to the welding method of the thin copper plate which concerns on this embodiment, it becomes possible to perform TIG welding of a thin copper plate, suppressing the thermal expansion and oxidation of a thin copper plate, being a very simple state.

Next, drainage drains manufactured by the above-described thin copper plate welding method will be described.
The drain for drainage is a device for discharging wastewater such as rainwater, spring water, groundwater, and sewage collected in buildings, equipment, and soil to the outside.

FIG. 6 is a perspective view showing the drain for drain according to the present embodiment.
As shown in FIG. 6, the drainage drain 5 according to this embodiment includes a copper plate portion 51 and a copper tube portion 52 welded to the periphery of a substantially central hole portion of the copper plate portion 51.
In the drainage drain 5, the drainage is guided to the copper pipe part 52 by the copper plate part 51 and discharged from a drainage pipe (not shown) connected to the copper pipe part 52.

The drainage drain 5 is manufactured using the above-described method for welding thin copper plates. That is, the thin drainage drain 5 with reduced weight is manufactured.
Accordingly, the drainage drain 5 can be manufactured without causing thermal expansion or oxidation by TIG welding on a thin copper plate. As a result, the drainage drain 5 can be made of copper brown and the surface is glossy and free from beats and can be of high quality.
By the way, the thin copper plate changes its color to blue or gold when heat is accumulated, and becomes a wavy state in which the surface is boiled. When further heat is applied, the thin copper plate changes to copper oxide. These phenomena cause quality degradation.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

For example, in the welding method for thin copper plates according to the present embodiment, the peripheral edge portion 11 of the copper flat plate 1 has a structure that is bent so that the copper flat plate 1 rises upward from the surface thereof, The end portion 21 has a structure in which the diameter is larger than other portions of the copper tube 2, but the structures of the peripheral edge portion 11 and the one end portion 21 are not limited to these.
Moreover, the peripheral part 11 of the copper flat plate 1 and the edge part 21 of the one side of the copper pipe 2 do not need to have these structures.

  In the thin copper plate welding method according to the present embodiment, the base 4, the support block 41, the elastic block 42, the contact plate 43 and the fixed block 44 are provided, but these are not essential components. That is, it is not limited to these as long as the copper flat plate 1 and the lower jig 32 can be supported.

In the thin copper plate welding method according to the present embodiment, the base 4 has a bottom that supports the lower jig 32 by the support block 41, the elastic block 42, the contact plate 43, and the fixed block 44. The shapes of the support block 41, the elastic block 42, the contact plate 43, and the fixed block 44 are not limited to the shapes shown in FIG.
That is, the shapes of the support block 41, the elastic block 42, the contact plate 43, and the fixed block 44 can be changed as appropriate in accordance with the shape of the lower jig to be fitted.

  In the thin copper plate welding method according to the present embodiment, the upper jig 31 includes a plate-like body 310 and a flat contact portion 312 provided on the lower surface of the plate-like body 310. It has a semicircular cutout portion 31a along the shape, the end portion 311 on the cutout portion 31a side of the plate-like body 310 is tapered, and the lower jig 32 has an inverted L-shaped vertical section. However, the structures of the upper jig 31 and the lower jig 32 are not limited to these.

  In the thin copper plate welding method according to the present embodiment, the upper jig 31 and the lower jig 32 both release excess welding heat, but either one may be used, You may provide separately what escapes welding heat.

  In the thin copper plate welding method according to this embodiment and the thin copper plate welding apparatus according to this embodiment, TIG welding is performed, but other arc welding can also be applied.

The thin copper plate welding method and thin copper plate welding apparatus of the present invention are used for TIG welding of a copper flat plate and a copper pipe. That is, it is used for manufacturing drainage drains manufactured by TIG welding.
The drain for drainage of the present invention is used as a device for discharging waste water such as rain water, spring water, ground water, sewage collected in buildings, equipment, soil and the like to the outside.
According to the thin copper plate welding method, thin copper plate welding apparatus and drainage drain of the present invention, TIG welding can be performed on the thin copper plate without causing thermal expansion or oxidation.

DESCRIPTION OF SYMBOLS 1 ... Copper flat plate 10 ... Hole 10a ... Periphery vicinity 11 ... Peripheral part 2 ... Copper pipe 21 ... End part of one side 31 ... Upper jig 310 ... Plate-like body 311 ... End part 312 ... Abutting part 31a ... Notch part 32 ... Lower jig 32a ... Jig hole 41 ... Support Block 42 ... Elastic block 43 ... Abutment plate 44 ... Fixed block 5 ... Drain for drainage 51 ... Copper plate part 52 ... Copper tube part H1 ... (copper flat plate) thickness H2 ... thickness of copper pipe H3 ... distance S ... height W ... tungsten rod

The present invention relates to a method for welding a thin copper plate, a welding apparatus for a thin copper plate, and a method for producing a drain for drainage , and more specifically, a welding method for a thin copper plate in which a copper flat plate and a copper pipe are welded by TIG welding, and a thin copper plate The present invention relates to a welding apparatus and a method for producing drainage drain produced thereby.

The present invention has been made in view of the above circumstances, and has a thin copper plate welding method, thin copper plate welding apparatus, and drainage that can perform TIG welding on a thin copper plate without causing thermal expansion or oxidation. It aims at providing the manufacturing method of a drain.

This invention exists in the manufacturing method of the drain for drainage manufactured by the welding method as described in any one of (8) said (1)-(7).

In the method for producing drainage drain according to the present invention, since it is produced by the above-described copper welding method, TIG welding can be performed on a thin copper plate without causing thermal expansion or oxidation. Thereby, the drain for drainage which is sufficiently excellent in quality can be obtained.

The thin copper plate welding method and thin copper plate welding apparatus of the present invention are used for TIG welding of a copper flat plate and a copper pipe. That is, it is used for manufacturing drainage drains manufactured by TIG welding.
Further, the method for producing drainage drain according to the present invention is used as a method for producing an apparatus for discharging wastewater such as rainwater, spring water, groundwater, sewage, etc. accumulated in a building, equipment, soil or the like to the outside.
According to the thin copper plate welding method, thin copper plate welding apparatus, and drainage drain manufacturing method of the present invention, TIG welding can be performed on a thin copper plate without causing thermal expansion or oxidation.
It exists in the decoration sheet.

Claims (9)

A welding method of a thin copper plate for welding a peripheral portion of the hole portion of a copper flat plate having a circular hole portion and an end portion on one side of a cylindrical copper tube,
A thin copper plate that sandwiches the copper flat plate in the vicinity of the peripheral edge of the hole so as to have a constant narrow pressure with an upper jig and a lower jig, and performs TIG welding while releasing excess welding heat generated during welding Welding method. The method for welding a thin copper plate according to claim 1, wherein the narrow pressure is 200 kgf / cm ² or more.   The method for welding thin copper plates according to claim 1 or 2, wherein the upper jig or the lower jig releases the excess welding heat.   The thin copper plate welding method according to claim 3, wherein the upper jig or the lower jig is made of iron. The lower jig is an annular body having a flat upper surface;
The thin copper sheet welding method according to any one of claims 1 to 4, wherein the copper tube is insertable inside the lower jig. The upper jig is composed of a plate-like body and a contact portion provided on the lower surface of the plate-like body,
The lower surface of the contact portion is flat,
The integrated plate-like body and the contact portion have a semicircular cutout along the shape of the copper tube,
The method for welding a thin copper plate according to any one of claims 1 to 5, wherein an end of the plate-like body on the side of the notch is tapered.   The method for welding thin copper plates according to claim 6, wherein a distance between a gap between the copper pipe and the periphery of the notch is 2 mm to 6 mm.   A drain for drainage produced by the welding method according to any one of claims 1 to 7. A welding device for a thin copper plate for welding a peripheral portion of the hole portion of a copper flat plate having a circular hole portion and an end portion on one side of a cylindrical copper tube,
An upper jig and a lower jig for sandwiching the copper flat plate in the vicinity of the periphery of the hole so as to have a constant narrow pressure;
A base formed with a circular hole into which the lower jig is fitted;
An annular support block fixed by a fixture to the lower surface of the base around the circular hole;
An annular elastic block fitted in the inner peripheral wall of the support block;
An annular contact plate in contact with the lower surface of the support block and the elastic block;
An annular fixed block fixed to the support block by a fixture via the contact plate;
With
When the copper flat plate is placed on the upper surface of the base and the lower jig, the upper surface of the lower jig is flush with the upper surface of the base, and the lower jig is positioned above the elastic block. Welding equipment for thin copper plates biased by

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