JPH10193084A - Brazing method and brazing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brazing method which stabilizes the cleanliness of joined surface and improves the brazed quality, and a brazing device. SOLUTION: A joining number 1 to be brazed by piling and a member 2 to be joined, are held to the state before piling. Under the holding state, the joining surface is heated with a torch 49 for heating while injecting vaporized flux onto the joining surface of the joining member 1 from a flux injecting nozzle 50. After completing the heating and removing oxide film on the joining surface of the joining member 1, the joining member 1 and the member 2 to be joined are shifted to the piling state. Then, after completing the shifting, the joining member 1 and the member 2 to be joined are brazed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing method and a brazing apparatus, and more particularly to an automatic brazing apparatus for joining different or similar metal materials by using a gas burner, high-frequency heating or the like and a vaporizing flux. is there.

[0002]

FIG. 8 is a schematic sectional view showing an example of a conventional brazing method. Referring to the drawings, when a liquid flux is generally used, when brazing a large structure or a non-mass-produced product, first, a glue-like flux 102 is previously applied to each of the brazing surfaces where the joining member 1 and the member to be joined 2 overlap. Apply by brush and assemble. Then, after the joining member 1 and the member to be joined 2 are heated while moving the burner 101 alternately, the oxide film on the brazing surfaces of both the joining members is melted, and after heating, brazing is performed.

FIG. 9 is a schematic sectional view showing another example of a conventional brazing method. Referring to the figure, small structures and mass-produced parts are heated in a vertical position under good brazing conditions as shown in the figure. A relatively large gap G is set in the assembly portion between the joining member 1 and the member to be joined 2 such that when the applied glue-like flux 102 flows out due to a decrease in viscosity with heating and flows into the gap. Then, a flux 102 is applied to a portion of the joining member 1 at a boundary end with the member 2 to be joined, and heating brazing is performed while moving the burner 101.

[0004] In addition to the above brazing method, a brazing portion is further cleaned by using a vaporizing flux in combination, and brazing with higher reliability is widely performed.

[0005]

In the method shown in FIG. 8 in which a liquid flux is applied in advance and a joining member and a member to be joined are combined, the liquid flux is managed in a paste form,
It needs to be brushed or sprayed onto the brazing surface.
Further, since the liquid flux is applied in advance and the two joining members are fitted to each other, the flux 102 at the position where the joining member 1 is inserted into the member 2 to be joined is scraped off and collected inside. In addition, internal cleaning and drying of the member to be joined 2 are required. Furthermore, since the flux 102 is shaved, the flux is insufficient, and the removal of the oxide film becomes insufficient, which causes brazing failure.

On the other hand, as shown in FIG. 9, the bonding member 1 and the member to be bonded 2 are previously combined in a brazed state, and the flux 102 is applied to the heating portion, and the flux 102 is applied to the gap G of the overlapping portion while heating. In the automatic brazing method of brazing by infiltrating a liquid flux having increased fluidity, the flux 10
A few hundred degrees or more is required until 2 has a viscosity that increases fluidity. Therefore, the formation of an oxide film on the brazing surfaces on which the flux is not applied is increased with heating. Then, the heating proceeds, and the flux 102 having increased fluidity flows into the gap G to melt the oxide film, and the molten solder is brazed with wettability. However, in this case, if the flux does not flow into the gap G prior to the molten solder, brazing failure will occur. On the other hand, in order to improve the flow of the applied liquid flux, it is common practice to set the gap G for brazing to be relatively large. However, there is a drawback that it causes voids and blowholes in brazing.

In terms of workability, it is important to control the concentration and viscosity of the liquid flux and there is a disadvantage that the spray nozzle is easily clogged, which makes it difficult to completely automate the brazing apparatus. In order to make up for the above-mentioned disadvantages, automatic brazing with a small number of defects using a vaporized flux is mainly used, but the handling of the liquid flux remains unchanged. On the other hand, when this is heated and brazed using only the vaporized flux, the flux may not sufficiently penetrate into the overlapping portion of the two joining members, and there has been a problem that brazing cannot be performed with sufficient reliability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and when the joining surface of the joining member and the joining surface of the joining member are overlapped and brazed, an oxide film on the joining surface is formed. It is an object of the present invention to provide a brazing method and a brazing apparatus that can be sufficiently removed and cleaned to further improve the quality of brazing.

[0009]

In order to achieve the above object, an invention according to claim 1 is a brazing method in which a joining surface of a joining member is overlapped with a joining surface of a member to be joined and brazed. The method includes a removing step of removing an oxide film on the joining surface, a polymerization step of overlapping the joining surface on the joining surface, and a brazing step of brazing the joining surface and the joining surface.

Here, in order to remove the oxide film, it suffices to apply a liquid flux or heat the joint surface in an atmosphere of a vaporized flux to apply chemical energy for dissolving the oxide film. And after removing the oxide film, the joining surfaces are overlapped, so the molten solder spreads with good wettability,
Seamless brazing is possible. According to a second aspect of the present invention, in the brazing method according to the first aspect, in the removing step, the joining surface is heated by a reducing flame having more combustible gas than the complete combustion ratio. Since the flame used for this heating oxidizes the heating surface if the amount of oxygen required for complete combustion is excessive with respect to the combustible gas, a reducing flame containing about 20% less oxygen is generally used. If the amount of the flammable gas is made excessive with respect to this heating flame, a soot containing a large amount of C, H, CO, etc. is emitted. When the joining surface is heated using this heating flame, hydrogen and carbon contained in the flame chemically react with oxides in the metal to promote cleaning of the joining surface by a reducing action.

According to a third aspect of the present invention, in the brazing method according to the second aspect, in the removing step, a vaporized flux is sprayed on the joint surface together with the heating by the reducing flame. The vaporized flux chemically dissolves or reduces the oxide, but since it is in a vaporized state, it acts on the entire joint surface evenly.

According to a fourth aspect of the present invention, there is provided a brazing apparatus for brazing by superposing a joining surface of a joining member on a joining surface of a member to be joined, wherein the joining member and the member to be joined are not overlapped. Holding means for holding the joined state, heating means for heating the joint surface in the held state while removing the oxide film on the surface, and a joint surface of the joint member and the member to be joined after the heating by the heating means is completed. A moving means for moving so as to overlap the surface to be joined, and after the movement by the moving means is completed,
And a brazing means for brazing the joining member and the member to be joined.

Here, to hold the joining member and the member to be joined in a state before the members are overlapped means that the joining surface and the member to be joined may be partially overlapped and held in the overlapped state. They may be held in a state where they are not overlapped at all. According to a fifth aspect of the present invention, in the brazing apparatus according to the fourth aspect, the heating means includes a flux supply means for supplying a vaporized flux to the joint surface.

[0014] Here, the vaporized flux chemically dissolves or reduces the oxide, but since it is in a vaporized state, it acts on the entire joint surface evenly. The invention according to claim 6 is the invention according to claim 5
In the brazing apparatus described above, the heating means includes a flux applying means for applying a liquid flux to the joint surface prior to the supply of the vaporized flux.

According to a seventh aspect of the present invention, in the brazing apparatus according to any one of the fourth to sixth aspects, the heating means is heated by a reducing flame having more combustible gas than the complete combustion ratio. According to an eighth aspect of the present invention, in the brazing apparatus according to the fifth or sixth aspect, the heating means is heated by a high-frequency heating coil.

According to a ninth aspect of the present invention, in the brazing apparatus according to the eighth aspect, the brazing means uses a brazing filler metal as a brazing material.

[0017]

According to the first aspect of the present invention, since the oxide film on the joining surface is removed before overlapping, the cleaning of the joining surface is stabilized and the quality of brazing is improved. Further, since the design of the gap at the joint surface can be made narrower, the strength of the brazed joint is greatly improved. According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, as the bonding surface is heated and the temperature rises, the reduction action by the reducing flame increases, so that the oxide film can be more efficiently removed.

According to the third aspect of the invention, in addition to the effect of the second aspect, the effect of removing the oxide film is stabilized regardless of the shape of the joint surface. According to the fourth aspect of the present invention, since the oxide film on the joining surface is removed before the overlapping, the quality of brazing is improved and the apparatus is suitable for automation of the apparatus. According to the fifth aspect of the invention, in addition to the effect of the fourth aspect, the effect of removing the oxide film is stabilized regardless of the shape of the joint surface.

According to the sixth aspect of the present invention, in addition to the effect of the fifth aspect of the present invention, an oxide film which cannot be sufficiently removed only by the vaporized flux can be surely removed, and brazing of more stable quality can be achieved. The invention according to claim 7 is the invention according to claim 4.
In addition to the effects of any one of the sixth to sixth aspects of the present invention, the reduction effect by the reducing flame increases as the joining surface is heated and the temperature rises, so that the removal of the oxide film becomes more efficient.

According to the eighth aspect of the present invention, in addition to the effects of the fifth or sixth aspect of the present invention, a stable adjustment of the amount of heating becomes possible. According to the ninth aspect of the present invention, in addition to the effect of the eighth aspect, brazing is facilitated even when a linear brazing material cannot be supplied due to the installation of the high-frequency heating coil.

[0021]

1 is a side view of an automatic brazing apparatus according to a first embodiment of the present invention, in which a heating and brazing station is shown. FIG. 2 is a side view of the automatic brazing apparatus. FIG. 3 is a side view of the liquid flux application station, and FIG. 3 is a plan view of the automatic brazing apparatus of FIG. 1, showing a positional relationship between a brazing jig, a liquid flux application unit, and a heating brazing unit. .

Referring to these figures, the automatic brazing apparatus shown in FIG. 1 is roughly divided into a brazing jig unit A for clamping a member to be welded to accurately position, a heating brazing unit B, and a brazing material. , A combustion gas and vaporization flux supply auxiliary device C, and a liquid flux application unit D. The brazing jig unit A, the heating brazing unit B, and the liquid flux applying unit D are connected to the brazing device fixing table 3.
1, the mutual positional relationship is fixed.

The brazing jig unit A includes a drive motor 18 for intermittently driving the index table 16 and an index table 16 connected to a drive shaft of the drive motor 18.
And an index gear 17 for accurately positioning are fixed below the brazing device fixing table 31. Above the index table 16 at the center of the jig table, an air pipe 103 is connected via a seal ring 15 that allows the outer periphery of the shaft to rotate by sealing it with an O-ring. The compressed air is supplied to a driving source such as a jig clamp. Supply. The connection of the air pipe 103 using the rotatable seal ring 15 is because direct connection cannot be made because the index table 16 rotates. In this embodiment, the jig clamp and the like are driven by using compressed air, but an electromagnetic drive, a motor drive or the like may be used instead.

On the index table 16, a plurality of jigs for clamping the joint member 1 and the member 2 to be jointed simultaneously and coaxially are arranged. In this jig, a lower cylinder shaft 13 for clamping and positioning the lower joined member 2 and a guide slide shaft 19 are fixed to an index table 16. The clamp arm 4 holding the workpiece 2 is driven to open and close by a chuck arm drive cylinder 8. The clamp arm 4 and the lower positioning cylinder 6 that moves the clamp arm 4 up and down share a common shaft with the lower cylinder shaft 13. The position of the rising end of the clamp arm 4 can be fixedly positioned with the ring stopper 11 that can be set at an arbitrary position.

A clamp arm 3 for holding the joining member 1
The clamp arm 3 and the upper positioning cylinder 5 that moves the clamp arm 3 up and down are driven by the chuck arm drive cylinder 7 to open and close. Upper cylinder shaft 1
4 and the lower cylinder shaft 13 are connected by screws, so that the clamp arm 3
Of the upper positioning cylinder 5 by rotating the handle 12.
Up and down. The position of the lower end of the upper positioning cylinder 5 can be determined by the ring stopper 10, and the position of the rising end can be determined by the ring stopper 9.

In the heating brazing unit B, the drive cylinder 28 fixed on the brazing device fixing table 31 is used.
The brazing unit frame 27 is connected to the guide rail 1 so that the brazing unit frame 27 can move back and forth toward the center of the index table 16.
04. FIG. 4 is a partially broken perspective view showing the internal mechanism of the brazing unit frame 27 in the heating brazing unit B of FIG.

Referring to the drawing, brazing unit frame 2
On the upper surface of 7, a movable frame 30 that is movable along the slide rail 105 toward the center of the index table 16 is attached. The moving frame 30 has a shape including a bottom surface and side surfaces on which both sides stand up, and a gas pipe 106 and a flux pipe 107 are provided so as to penetrate both side surfaces. Moving frame 30
One end of an oscillating arm 26 is fixed to a substantially central upper surface of the bottom of the oscillating arm, and the other end of the oscillating arm 26 is bent into an L-shaped cross section and is located on the front surface of a brazing unit frame 27. On the other end of the swing arm 26, an elongated hole 108 having one open end is formed.

On the other hand, a swing motor 34 is housed in the brazing unit frame 27, and a drive shaft 109 to which a driving force is transmitted via a gear box 111 in which a speed reducer is incorporated is provided with a bottom portion. A swinging rotary plate 40 having a U-shaped cross section and fixed to both side surfaces is fixed. Swing rotary plate 40
Slide bar 110 so that both sides
Is installed. A holding cylinder 114 that holds one end of an arm 113 disposed so as to pass through a long hole 108 of the swing arm 26 with a predetermined margin, and that can adjust the position with respect to the slide bar 110 by tightening a fixing screw 112.
Are slidably fitted to the slide bar 110.

As described above, the arm 113 can be adjusted to an arbitrary mounting position with respect to the slide bar 110 via the holding cylinder 114. Therefore, the radius of rotation of the arm 113 due to the rotation of the swing rotary plate 40 differs depending on the mounting position. The arm 113 has a long hole 108 of the swing arm 26.
, The swing arm 26 swings in the direction of the arrow in the figure according to the radius of rotation of the arm 113. By the swing of the swing arm 26, the moving frame 30
It swings on the slide rail 105 in the direction toward the center of the index table 16. The cycle of the swing of the moving frame 30 is determined by the rotation speed of the drive shaft 109, and the swing width is determined by the size of the rotation radius of the arm 113.

FIG. 5 shows the vaporized flux nozzle 22 of FIG.
FIG. 3 is a perspective view showing the structure of a gas nozzle 23. FIG.
As shown in the figure, on the side wall portion of the moving frame 30 on the side of the index table 16, the gas pipe 106 and the flux pipe 107 are fixed in a state where two gas nozzles 23 and a vaporization flux nozzle 22 having two tips are vertically overlapped and fixed. Connected to each other. At the tips of the gas nozzle 23 and the vaporizing flux nozzle 22, a plurality of pairs of a heating torch 49 and a flux injection nozzle 50 are attached to face each other.

Further, a nozzle drive cylinder 25 is connected to the brazing unit frame 27 so as to be adjustable in inclination to a fixing bracket 39, and the tip direction of the brazing material supply nozzle 24 is aimed at the center point of the heating flame by the heating torch 49. It is fixed together. Brazing material, combustion gas, vaporization flux (B
(CH ₃ O) ₃ or the like, the brazing material supply nozzle 24 is advanced by the driving of the nozzle driving cylinder 25 and approaches the brazing portions of the joining members 1 and the members 2 to be joined. The brazing material is fed by a predetermined amount from each of the wires 38a and 38b by the wire supply motor 32. The combustion gas is supplied after being mixed in a gas mixing chamber 33 through a mass flow valve 29 for controlling the flow rate of each of gas and oxygen at a fixed ratio. The gas mixing chamber 33 and the gas pipe 106 to which the gas nozzle 23 is connected are connected by a movable hose 36. The vaporized flux is blown with nitrogen gas into a sealed container 21 containing methanol or the like, and the vaporized flux is supplied via a movable hose 37 to a flux tube 107 to which the vaporized flux nozzle 22 is connected.

In the present embodiment, the liquid flux application unit D is provided with an index table 16 as shown in FIG.
Is provided on the brazing device fixing table 31 of the joining member 1 which is different from the center of the heating brazing unit B by 90 °. The liquid flux application unit drive cylinder 48 is fixed on the brazing device fixing table 31, and the tip of the liquid flux application unit drive cylinder 48 is connected to the flux application unit frame 47. The flux application unit frame 47 is installed on a pair of guide rails 115a and 115b so as to be able to move back and forth toward the center of the index table 16.

On the flux application unit frame 47, a fixture 46 for fixing the inclination of the liquid flux application applicators 43a and 43b is fixed. By moving forward the liquid flux application unit drive cylinder 48,
The positional relationship between the tips of the liquid flux application applicators 43a and 43b and the brazing portion of the joining member 1 is adjusted. The liquid flux application applicators 43a and 43b that are adjusted and fixed toward the center of the brazing portion of the joining member 1 include:
Liquid flux is applied to the brazing portion of the joining member all around the brazing portion.

Next, the operation of the brazing jig unit A will be described. At the position of the loading / unloading station shown in FIG. 3, the lower positioning cylinder 6 of the jig unit A whose details are shown in FIGS. 1 and 2 is raised to the position of the ring stopper 11 at the rising end, and the upper positioning cylinder 5 is ring-mounted. It descends to the position of the stopper 10. The chuck arm driving cylinder 7 and the chuck arm driving cylinder 8 are retracted and the clamp arms 3 and 4 start moving in an open state, and the joining member 1 and the member to be joined 2 are assembled in a brazed state. Jig clamp arms 3, 4
Is set to Then, the chuck arm driving cylinder 7 and the chuck arm driving cylinder 8 advance, and the two joining members are clamped by the clamp arms 3 and 4.

Next, when the start button is operated, the drive motor 18 is operated to rotate the index table 16 by 90 ° by the rotation of the index gear 17, and the crank arms 3, 4 are moved to the position facing the liquid flux application unit D. Stop. This rotational position is determined by the joining member (A) in which the oxide cannot be dissolved only by the vaporized flux.
liquid flux (KF) in the case of oxides such as l ₂ O ₃ , SiO ₂ , Cr ₂ O ₃ , TiO ₂ , BeO, etc.
System, HF system).

The stability of the metal oxide, which is an oxide film on the metal surface, differs depending on the type of the metal, and the removal of a metal having a stable oxide film is more difficult. The stability of an oxide can be usually qualitatively determined from its free energy of formation (attractive force between metal and oxygen), but the greater the negative absolute value of the free energy of formation, the more stable. That is, a metal (Al,
Ti, Si, Cr) has a higher affinity for oxygen, and conversely, these oxides can be said to be oxides which are difficult to be converted to metals except oxygen.

In this case, the liquid flux application unit D
Will be described. When applying the liquid flux to the joining member 1, the lower positioning cylinder 6 is operated to move down, move down to the upper surface of the index table 16 and stop. This state is as shown in the enlarged view of FIG.
The position of the ring stopper 10 is adjusted so that the overlapping margin L between the joining member 1 and the member to be joined 2 is about 0 mm to several mm. Then, the liquid flux application unit drive cylinder 48 advances, and the flux application unit frame 47 advances. Then, the liquid flux application applicators 43a and 43b approach the brazing portion of the joining member 1, and a predetermined amount of liquid flux is applied by the operation of the applicator. While maintaining this state, the index table 16 is rotated by 90 ° and set in the station facing the heating and brazing unit B.

Next, the operation of the heating and brazing unit B will be described. When the index table 16 is set in the station facing the heating and brazing unit B, the drive cylinder 28 advances to advance the brazing unit frame 27. Then, the gas nozzle 23 is stopped at the position shown in FIG. Here, the heating torch 49 and the flux injection nozzle 50 formed in each of the gas nozzle 23 and the vaporizing flux nozzle 24 face each other via the joining member 1 and the member to be joined 2 as shown in FIG. ing.

Then, the swing motor 34 rotates, and the swing arm 26 is moved back and forth by the eccentric cam mechanism including the arm 113 fixed to the swing rotary plate 40. That is, the heating torch 49 and the flux injection nozzle 50 move back and forth through the moving frame 30 to uniformly blow gas and vaporized flux onto the brazing portion of the joining member 1 to preheat. Here, for the preheating, a reducing flame having more combustible gas (C, H, CO) than the complete combustion ratio is used. Then, hydrogen and carbon contained in the flame chemically react with oxides in the metal and are reduced, and the cleaning of the joint surface is promoted. Ordinary oxides easily dissociate oxygen because the absolute value of free energy of formation decreases as the temperature increases. Only carbon monoxide (CO) has the opposite tendency, and as the temperature increases, the bond with oxygen becomes stronger. Therefore, oxygen can be removed from the oxide by using soot (C) having a strong affinity for oxygen, and the metal can be reduced.

At the same time when the preheating is completed, the lower positioning cylinder 6 is operated to move up to the position of the ring stopper 11. As a result, the clamp arm 4 rises while clamping the member 2 to be joined, so that the upper part of the member 2 overlaps with the joint member 1. As a result, the flux is forced to flow around the brazing gap, and the bonding surface of the member to be bonded 2 is also dissolved and the oxide film is cleaned. In this state, when the heating proceeds and the temperature reaches the brazing temperature, the mass flow valve 29 is operated, the flame of the heating torch 49 is set to the medium flame state, and the nozzle drive cylinder 25 moves forward. Then, when the brazing material supply nozzle 24 approaches the joining member 1, the wire supply motor 32 is driven, and the brazing material is supplied by a preset amount. Subsequently, the wire supply motor 32 stops instantaneously, and at the same time, the motor reversely rotates, and the nozzle driving cylinder 25 moves backward.
In parallel with this, when the post-heating after brazing is completed, the drive cylinder 28 is retracted, and the gas nozzle 23 and the vaporizing flux nozzle 22 are retracted to complete the brazing.

By the way, a joining member (such as iron, copper brass or the like, other than Ni, M
In the case of brazing (alloy material containing n, Sn, etc.), there is no treatment at the liquid flux application station, and the liquid flux is passed through the station, and the same operation as above is performed in the heating and brazing unit B. Although the first embodiment of the present invention has described the automatic brazing apparatus using a gas burner, FIG. 7 is an enlarged view of a heating unit according to the second embodiment of the present invention using high-frequency induction heating as a heating source. .

In this case, since the high-frequency heating coil 52 is disposed, the wire brazing material cannot be supplied from the outside as in the above-described embodiment, so that the brazing filler metal 51 is used. As shown in the figure, the joining member 1 is fixed without inserting the joining member 1 until the joined member 2 is joined, and the high-frequency heating coil 52 is set on the brazing surface on the joining member 1 side. Then, the vaporized flux is preheated while being sprayed from the vaporized flux nozzle 22, and the member 2 to be joined is raised and inserted into the brazing position of the joining member 1. Then, the heating is continued to melt the brazing filler metal 51 and the joining member 1 and the member to be joined 2 are brazed.

[Brief description of the drawings]

FIG. 1 is a side view of a heating and brazing station showing an outline of an automatic brazing apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view of a liquid flux application station of the automatic brazing apparatus of FIG. 1;

FIG. 3 is a plan view of the automatic brazing apparatus of FIG. 1, showing a positional relationship between a brazing jig, a liquid flux application station, and a heating brazing station.

FIG. 4 is a partially broken perspective view showing an internal mechanism of a brazing unit frame 27 in the heating brazing unit B of FIG. 1;

FIG. 5 is an enlarged perspective view showing a configuration of a vaporizing flux nozzle 22 and a gas nozzle 23 in the heating brazing unit B of FIG.

FIG. 6 is an enlarged view of a heating unit for the joining member 1 and the member to be joined 2 according to the first embodiment of the present invention.

FIG. 7 shows a joining member 1 according to a second embodiment of the present invention.
FIG. 3 is an enlarged view of a heating unit for a member to be joined 2.

FIG. 8 is an example of an enlarged view of a heating unit for a joining member 1 and a member to be joined 2 in a conventional brazing apparatus.

FIG. 9 is another example of an enlarged view of a heating unit for the joining member 1 and the joined member 2 in the conventional brazing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Joining member 2 ... Member to be joined 5 ... Upper positioning cylinder 6 ... Lower positioning cylinder 22 ... Vaporization flux nozzle 23 ... Gas nozzle 24 ... Brazing material supply nozzle 43a, 43b・ ・ ・ Liquid flux application applicator 49 ・ ・ ・ Heating torch 50 ・ ・ ・ Flux injection nozzle 51 ・ ・ ・ Place 52 ・ ・ ・ High frequency heating coil 101 ・ ・ ・ Burner 102 ・ ・ ・ Flux The same reference numerals indicate the same or corresponding parts.

Claims (9)

[Claims] 1. A brazing method in which a joining surface of a joining member is superimposed on a joining surface of a member to be joined and brazed, and a removing step of removing an oxide film on the joining surface; A brazing method, comprising: a polymerization step of superimposing on a surface to be joined; and a brazing step of brazing the joint surface and the surface to be joined. 2. The brazing method according to claim 1, wherein, in the removing step, the joining surface is heated by a reducing flame having more combustible gas than a complete combustion ratio. 3. The brazing method according to claim 2, wherein in the removing step, a vaporized flux is sprayed on the joint surface together with the heating by the reducing flame. 4. A brazing apparatus for brazing by joining a joining surface of a joining member to a joining surface of a member to be joined, wherein the joining member and the member to be joined are held in a state before being overlapped. Holding means, heating means for heating the joint surface in the held state while removing an oxide film on the surface, and after the heating by the heating means is completed, the joint surface of the joint member and the object to be joined A brazing device, comprising: moving means for moving the member to be joined so as to overlap the surface to be joined; and brazing means for brazing the joint member and the member to be joined after the movement by the moving means is completed. . 5. The heating means includes a flux supply means for supplying a vaporized flux to the joint surface.
The brazing device as described. 6. The brazing apparatus according to claim 5, wherein said heating means includes a flux applying means for applying a liquid flux to said bonding surface before supplying said vaporized flux. 7. The brazing apparatus according to claim 4, wherein said heating means heats with a reducing flame having more combustible gas than a complete combustion ratio. 8. The brazing apparatus according to claim 5, wherein said heating means heats by a high-frequency heating coil. 9. The brazing apparatus according to claim 8, wherein said brazing means uses a brazing filler metal as a brazing material.