CN207494818U - Brazing ring and brazing system - Google Patents
Brazing ring and brazing system Download PDFInfo
- Publication number
- CN207494818U CN207494818U CN201721433600.2U CN201721433600U CN207494818U CN 207494818 U CN207494818 U CN 207494818U CN 201721433600 U CN201721433600 U CN 201721433600U CN 207494818 U CN207494818 U CN 207494818U
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- brazing
- solder layer
- solder
- layer
- braze
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- 238000005219 brazing Methods 0.000 title claims abstract description 77
- 229910000679 solder Inorganic materials 0.000 claims description 123
- 238000003466 welding Methods 0.000 claims description 72
- 230000004907 flux Effects 0.000 claims description 36
- 239000006023 eutectic alloy Substances 0.000 claims description 19
- 238000005476 soldering Methods 0.000 claims description 18
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 claims description 9
- -1 aluminium-germanium Chemical compound 0.000 claims description 8
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical compound [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 claims description 7
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical group [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 claims description 7
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- 239000011591 potassium Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 abstract description 11
- 239000000945 filler Substances 0.000 abstract description 10
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 230000008018 melting Effects 0.000 abstract description 6
- 238000002844 melting Methods 0.000 abstract description 6
- 239000002131 composite material Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 31
- 239000000463 material Substances 0.000 description 23
- 239000004411 aluminium Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 230000004438 eyesight Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000007769 metal material Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
The utility model relates to a weld ring and make technical field, especially relate to a ring and system of brazing. This brazing ring, including the brazing filler metal, this brazing filler metal includes: an inner braze layer having a first melting point; the outer brazing filler metal layer wraps the inner brazing filler metal layer, and the outer brazing filler metal layer has a second melting point which is higher than the first melting point. The utility model discloses embodiment is through designing into composite construction with the ring of brazing, is respectively: the inner brazing filler metal layer and the outer brazing filler metal layer are in a liquid state when the outer brazing filler metal layer is solidified in the later brazing period, small gaps between the air holes and the welded pipes can be further filled, the flowing time of the brazing filler metal is prolonged, and the brazing quality is improved.
Description
Technical field
The utility model embodiment is related to weld-ring manufacturing technology field, is more particularly to a kind of braze-welding rings and soldering
System.
Background technology
A series of U-tubes are included in fin in the aluminum tube fin type heat exchanger used in air-conditioning.Wherein, U-tube generally with
Eyesight elbow needs to carry out fill solder in brazing process by soldering connection.It is of the prior art in order to realize automatic welding
Fill solder is usually that a weld-ring is socketed on eyesight elbow, is carried out between U-tube and eyesight elbow using weld-ring to serve as solder
Weld seam filling, realize automatic welding.Wherein, since the brazing temperature section of aluminum pipe is narrow, in order to avoid welding process Flame
Temperature it is excessively high and burn out eyesight elbow, flame can generally be directly heated to weld-ring region.
Inventor has found in the process of implementing the utility model, when flame is directly heated weld-ring region, due to aluminium
Brazing temperature section is narrow, and the filling that weld seam is will appear between U-tube and eyesight elbow is not full, generates the weld defects such as stomata.
Utility model content
The utility model embodiment aims to solve the problem that existing U mainly solving the technical problems that provide a kind of braze-welding rings
The technical issues of filling of weld seam is not full between type pipe and eyesight elbow
In order to solve the above technical problems, the technical solution that the utility model embodiment uses is：A kind of pricker is provided
Weld-ring, including solder, the solder includes：Interior solder layer, the interior solder layer have the first fusing point；Outer solder layer, it is described outer
Solder layer wraps up the interior solder layer, and the outer solder layer has the second fusing point, and second fusing point is higher than first fusing point.
Wherein, the braze-welding rings further include：Brazing flux layer, the brazing flux layer wrap up the outer solder layer.
Wherein, the outer solder layer is aluminium-silicon alloys.
Wherein, the interior solder layer is one in aluminium-zinc eutectic alloy, aluminium-germanium eutectic alloy or aluminium-magnesium eutectic alloy
Kind.
Wherein, the brazing flux layer is potassium fluoroaluminate.
Wherein, the shape in the section of the braze-welding rings is rounded.
Wherein, the brazing flux layer has the third fusing point less than first fusing point.
In order to solve the above technical problems, another technical solution that the utility model embodiment uses is：It provides a kind of
Soldering system, including:The weldering pricker system includes weldering pricker ring as described above.
The utility model embodiment by braze-welding rings by being designed to composite construction, respectively：Interior solder layer and outer solder layer,
Cause the phase after brazing, when outer solder layer solidifies, interior solder layer can further fill stomata and welding tubing still in liquid
Between small gap, extend the flowing time of solder, improve brazing quality.
Description of the drawings
Fig. 1 is a kind of structure diagram for braze-welding rings that the utility model embodiment provides；
Fig. 2 is a kind of structure diagram for soldering system that the utility model embodiment provides.
Specific embodiment
For the ease of understanding the utility model, with reference to the accompanying drawings and detailed description, the utility model is carried out more
Detailed description.It should be noted that when element is expressed " being fixed on " another element, it can be directly in another element
Above or therebetween there may be one or more elements placed in the middle.When an element is expressed " connection " another element, it can
To be directly to another element or there may be one or more elements placed in the middle therebetween.This specification is used
Term " vertical ", " horizontal ", "left", "right" and similar statement for illustrative purposes only.
Unless otherwise defined, the skill of technical and scientific term all used in this specification with belonging to the utility model
The normally understood meaning of technical staff in art field is identical.In the art used in the description of the utility model in this specification
Language is intended merely to the purpose of description specific embodiment, is not intended to limitation the utility model.Art used in this specification
Language "and/or" includes the arbitrary and all combination of one or more relevant Listed Items.
For the ease of understanding of the those skilled in the art to the utility model embodiment, inventor using braze-welding rings to being realized
The action principle of automatic welding is described below：
Soldering is to do solder using the liquidus temperature metal material lower than base material solid-state temperature, and base material and solder heat are arrived
Solder melts, and using liquid phase solder wetting base material, the effect spread in junction by the thawing or contact of solder is realized
Alloying is welded.
Based on above-mentioned principle, welding is realized usually using braze-welding rings in the prior art.Wherein, basic braze-welding rings are by pricker
Agent and solder two parts composition.Each braze-welding rings typically each have two characteristics relevant with base material：
1st, the fusing point of brazing flux is less than the fusing point of solder, and the fusing point of solder is less than base material fusing point；
2nd, solder must infiltrate on base material, i.e., alloy is realized in the interface gap between solder and base material by diffusion
Change.
In brazing process, the melting temperature that brazing temperature rises to brazing flux first enables brazing flux melt.After brazing flux fusing, energy
Solder and the oxide on base material surface are enough removed, to ensure abundant infiltration (but during the reaction, the pricker between base material and solder
When agent is with oxidation film reaction, the gas of generation can form stomata on base material surface).
Then, brazing temperature continues to rise to the melting temperature of solder and enables brazing filler metal melts.On the one hand solder after fusing exists
Wetting (stomata that filling brazing flux is generated with aoxidizing film reaction), on the other hand (is filled out in the junction contact diffusion of base material on base material
Fill the weld seam between two base materials), realize welding.
In metal material, the fusing point of some metal materials is relatively low, poor heat resistance, for example, the fusing point of aluminium tube is at 660 DEG C
Left and right, when aluminium tube is used to realize soldering connection as base material, the fusing point of solder and the fusing point of aluminium tube approach so that aluminum pipe
The brazing temperature of material is narrow (solder fusing point --- the section of aluminium fusing point) relative to the brazing temperature of other metal materials, soldering
Temperature is narrow, can cause in brazing process, and solder has little time to fill stomata and weld seam that reaction process generates, after causing welding
Pipe workpiece quality is low.
For the relatively low metal material of the heat resistances such as aluminum pipe in the welding process there are the problem of, the utility model embodiment
A kind of braze-welding rings are provided, which, which can reduce weld seam outflow in brazing process, causes the filling of aluminium tube weld seam not full, with
And the stomata that brazing process generates is filled, improve the brazing quality of aluminium tube.
Referring to Fig. 1, Fig. 1 is a kind of schematic cross-section for braze-welding rings that the utility model embodiment provides, such as Fig. 1 institutes
Show, which includes, interior solder layer 11, outer solder layer 12 and brazing flux layer 13.
Wherein, interior solder layer 11 has the first fusing point.Outer solder layer 12 wraps up interior solder layer 11, and outer solder layer 12 is
Aluminium-silicon alloys with the second fusing point, wherein, the fusing point of aluminium-silicon alloys is higher than the first fusing point of interior solder layer 11.At other
In embodiment, outer solder layer can be such as relevant using other according to the needs of actual conditions, using other suitable solders
Aluminium alloy does solder, and is not limited to aluminium-silicon alloys；In further embodiments, brazing flux layer 13 can be brazed needs according to practical
It is omitted.
Brazing flux layer 13 wraps up outer solder layer 12, and brazing flux layer has the third fusing point less than the first fusing point, for welding
Oxide film dissolving is removed in journey.In above-mentioned braze-welding rings 10, the fusing points of aluminium-silicon alloys less than metallic aluminium fusing point, it can be achieved that aluminum pipe it
Between soldering connection.It realizes that the concrete principle of welding is using above-mentioned braze-welding rings：
1st, when braze-welding rings 10 are assembled between two aluminium tubes first, brazing temperature is enabled to rise to third fusing point temperature first
Degree, brazing flux layer 13 are melted, are reacted with the oxidation film on aluminium tube surface, remove the oxidation film on aluminium tube surface to enhance solder
In aluminium tube wettability of the surface and mobility.
2nd, when after brazing flux layer 13 dissolves, brazing temperature rises to the second fusing point, outer solder layer 12 starts to melt, outer solder
Layer 12 soaks the stomata generated to fill brazing flux layer with aoxidizing film reaction on aluminium tube, and outer solder layer 12 connects rapidly in aluminium tube
The weld seam between place's contact diffusion filling aluminium tube is connect, realizes welding.
3rd, outer solder layer 12 is dissolved after liquid, and interior solder layer 11 is also in a liquid state fusing.
4th, it is last, phase after brazing, after outer 12 part of solder layer starts solidification, since there are the difference of fusing point, interior prickers
The bed of material 11 is still in liquid so as to fill the stomata between two aluminium tubes and fill not full weld seam, completing two
Welding between aluminium tube.
During being welded using welding ring provided in this embodiment, since outer solder layer 12 is enclosed with not
With the interior solder layer 11 of fusing point.Therefore, when outer solder layer 12 fills up rapidly tubing gap and starts solidification, interior solder layer 11 is still
Liquid can be so in, is equivalent to the flowing time for extending solder.Interior solder layer 11 in liquid can further fill gas
Hole and small gap, improve brazing quality.
And when using usual braze-welding rings, since the brazing temperature of aluminium tube is narrow, the holding time is short, outer solder layer 12
Larger stomata and weld seam can only be filled when melting, maintains the time of liquid too short and has little time to fill spilehole and two aluminum pipes
Narrow gap between material leads to a series of weld defect occur.
To sum up, the utility model embodiment by braze-welding rings by being designed to the three of interior solder layer, outer solder layer and brazing flux layer
Layer composite construction so that the phase after brazing, during the solidification of outer solder layer, interior solder layer is still in liquid, and solder layer can be into order
One step fills stomata and welds the small gap between tubing, extends the flowing time of solder, improves brazing quality.
In some embodiments, interior solder layer is eutectic alloy.It is closed for example, interior solder layer is specifically as follows aluminium-zinc eutectic
One or more of gold, aluminium-germanium eutectic alloy or aluminium-magnesium eutectic alloy.Wherein, aluminium-zinc eutectic alloy, aluminium-germanium eutectic
The fusing point of alloy and aluminium-magnesium eutectic alloy is below the fusing point of aluminium-silicon alloys, suitable for doing interior solder layer, in relatively narrow soldering
, it can be achieved that high quality is brazed in the range of temperature and time.
The fusing point of interior solder layer material is less than the fusing point of outer solder layer material, it is corresponding in the solder layer strength of materials also below
The intensity of outer solder layer material, therefore work as and use above-mentioned aluminium-zinc eutectic alloy, aluminium-germanium eutectic alloy and aluminium-magnesium eutectic alloy generation
During for aluminium-silicon alloys as outer solder layer, aluminium-zinc eutectic alloy, aluminium-germanium eutectic alloy and aluminium-magnesium eutectic alloy can be realized
It fills stomata and welds the small gap between tubing, but the weld strength between aluminium can be caused inadequate, and influence welding matter
Amount, and using the utility model be embodiment provide aluminium-silicon alloys as outer solder layer, aluminium-zinc eutectic alloy, aluminium-germanium are common
Solder layer can then solve drawbacks described above in one or more of peritectic alloy or aluminium-magnesium eutectic alloy work.
In the present embodiment, outer solder layer is the solder usually used.And interior solder layer is special, fusing point is less than normal
A kind of alloy (that is, may be considered additional additive) of solder.In order to ensure in brazing process, welding ring can and
When fusing and solidification, the ratio between interior solder layer and outer solder layer should be at suitable proportional region.In some implementations
In example, the mass ratio of outer solder layer and the interior solder layer can be controlled 8:2—7:Range between 3.Wherein, in interior solder
During the solder too high levels of layer (be higher than solder gross mass 30%), the ratio of outer layer solder can be cut down (less than solder gross mass
70%), the junction portion intensity after welding can be caused to reduce in this way, welding performance declines, and can not realize and consolidate between tubing
Welding..And when the solder content of interior solder layer is too low (be less than solder gross mass 20%), the solder mistake of interior solder layer
It is few, it is not enough to fill all tiny gaps, the filling for leading to fine crack is not full.When interior solder layer and outer solder layer are using above-mentioned
During quality ratio, it can be very good while weld defect is eliminated, to keep the quality of welding, it is ensured that securely connecting between tubing
It connects.
Further, in the welding process, the ratio between solder and brazing flux is also that additional control is needed to reach more preferable
Welding effect.Different solders and brazing flux cause the result of welding significant difference occur than regular meeting.In some embodiments,
The mass ratio of the solder and the brazing flux layer can be 9:1—8:2.
Due to brazing flux effect mainly dissolving aluminum tube surfaces oxidation film, to improve solder in its wettability of the surface.In pricker
Agent content is excessively high, on the one hand can cause to waste, and another aspect brazing flux can impact subsequent welding process, be formed excessive
Stomata etc. leads to undesirable weld defect occur.But if the ratio of brazing flux is relatively low, and the oxidation film of base material and brazing flux can be enabled to remove
Not exclusively, the wellability of solder in the welding process is influenced, leads to the decline of welding quality.
Specifically, in actual application, can select to use different brazing flux layers according to different application scenarios.
Preferably, when applying the Welding between aluminium tube, brazing flux layer can use potassium fluoroaluminate, and certain brazing flux layer can be with
It is the modification brazing flux based on potassium fluoroaluminate, such as fluoaluminic acid caesium.
As shown in Figure 1, the shape in the section of the braze-welding rings provided in the utility model embodiment is rounded, welding
When, it can be set on tubing to be welded, fill the gap between tubing so as to complete to be brazed.In further embodiments,
The tubing cross sectional shape welded according to specific needs, the welding ring can also use other suitable, be adapted with tubing
Shape, and it is not limited to regular circular.
Referring to Fig. 2, the utility model embodiment also provides a kind of soldering system 20.As shown in Fig. 2, soldering system 20 is wrapped
It includes：Elbow 21, U-tube 22 and braze-welding rings 23.
In soldering system 20 shown in Fig. 2, the scalable assembling in both ends of elbow 21 and the both ends of U-tube 21, and it is curved
First 21 parts being in contact with U-tube 22 are with weld seam.
Braze-welding rings 23 are sheathed between elbow 21 and U-tube 22, which is based on the design in above-described embodiment
The braze-welding rings that thinking obtains have the Combined Welding ring structure of interior solder layer, outer solder layer and brazing flux layer composition.
During being brazed, braze-welding rings 23 melt, the brazing flux layers of braze-welding rings 23 first respectively with elbow 21
It reacts with the surface film oxide of U-tube 22.The outer solder layer of braze-welding rings 23 flows into the weldering between elbow 21 and U-tube 22
Seam, connecting bend 21 and U-tube 22.
And phase after brazing, during outer solder layer solidification, interior solder layer is still in liquid so as to further fill elbow 21 and U
Spilehole and narrow gap between type pipe 22 ensure brazing quality.
In some embodiments, braze-welding rings 23 are also designed to the shape that other are adapted with the base material welded
Shape, once in this way, braze-welding rings 23 are heated, the outer solder layer in liquid has specific flow direction, more fully to flow to weld seam.
The utility model embodiment also provides a kind of full aluminum tube fin type heat exchanger.It is common, full aluminum tube fin type heat exchanger by
Long U-tube and eyesight elbow are formed by soldering connection.
In the present embodiment, which welds U-tube and eyesight elbow by soldering system shown in Fig. 2
It obtains.By the full aluminum tube fin type heat exchanger of welding system shown in Fig. 2 welding generation as a result of welding shown in FIG. 1
Ring, the full aluminum tube fin type heat exchanger obtained compared to traditional approach welding has more excellent welding quality, in welding position
Weld defect is less, and performance is more excellent.
In conclusion the braze-welding rings that the utility model embodiment provides have three-layer composite structure, pass through interior solder layer
Setting extends the flowing time of solder, has the function of to fill automatically, is effectively reduced soldering stomata, gap, filling insatiable hunger
The defects of full.
In addition the brazing flux layer being coated on solder is close to tubing wall.After heating, brazing flux can be flowed along tubing wall, with oxidation
Film fully reacts, and can more thoroughly remove oxide film dissolving, promotes solder in the wetability and mobility of tube surfaces, makes weld seam more
Add full.
The foregoing is merely the embodiments of the utility model, and it does not limit the scope of the patent of the present invention, all
It is equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, directly or indirectly uses
In other related technical areas, it is equally included in the patent within the scope of the utility model.
Claims (8)
1. a kind of braze-welding rings, including solder, which is characterized in that the solder includes：
Interior solder layer, the interior solder layer have the first fusing point；
Outer solder layer, the outer solder layer wrap up the interior solder layer, and the outer solder layer has the second fusing point, and described second is molten
Point is higher than first fusing point.
2. braze-welding rings according to claim 1, which is characterized in that further include：
Brazing flux layer, the brazing flux layer wrap up the outer solder layer.
3. braze-welding rings according to claim 1, which is characterized in that the outer solder layer is aluminium-silicon alloys.
4. braze-welding rings according to claim 3, which is characterized in that the interior solder layer is aluminium-zinc eutectic alloy, aluminium-germanium
One kind in eutectic alloy or aluminium-magnesium eutectic alloy.
5. braze-welding rings according to claim 2, which is characterized in that the brazing flux layer is potassium fluoroaluminate.
6. braze-welding rings according to claim 1, which is characterized in that the shape in the section of the braze-welding rings is rounded.
7. braze-welding rings according to claim 2, which is characterized in that the brazing flux layer has the less than first fusing point
Three fusing points.
8. a kind of soldering system, it is characterised in that, the soldering system further includes claim 1-7 any one of them such as and is brazed
Ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721433600.2U CN207494818U (en) | 2017-10-31 | 2017-10-31 | Brazing ring and brazing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721433600.2U CN207494818U (en) | 2017-10-31 | 2017-10-31 | Brazing ring and brazing system |
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| Publication Number | Publication Date |
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| CN207494818U true CN207494818U (en) | 2018-06-15 |
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| CN201721433600.2U Active CN207494818U (en) | 2017-10-31 | 2017-10-31 | Brazing ring and brazing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107617829A (en) * | 2017-10-31 | 2018-01-23 | 珠海格力电器股份有限公司 | Brazing ring and brazing system |
| WO2021223781A3 (en) * | 2021-04-12 | 2022-02-17 | 郑州机械研究所有限公司 | Multilayered flux-cored silver brazing material and production method therefor |
-
2017
- 2017-10-31 CN CN201721433600.2U patent/CN207494818U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107617829A (en) * | 2017-10-31 | 2018-01-23 | 珠海格力电器股份有限公司 | Brazing ring and brazing system |
| WO2021223781A3 (en) * | 2021-04-12 | 2022-02-17 | 郑州机械研究所有限公司 | Multilayered flux-cored silver brazing material and production method therefor |
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