CN215658547U - Flux-cored brazing filler metal - Google Patents
Flux-cored brazing filler metal Download PDFInfo
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- CN215658547U CN215658547U CN202121478224.5U CN202121478224U CN215658547U CN 215658547 U CN215658547 U CN 215658547U CN 202121478224 U CN202121478224 U CN 202121478224U CN 215658547 U CN215658547 U CN 215658547U
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- flux
- melting
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- brazing
- solder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0227—Rods, wires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/26—Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
- B23K35/262—Sn as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3006—Ag as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Abstract
The utility model belongs to the field of brazing materials, and particularly relates to a flux-cored brazing filler metal. The flux-cored solder comprises a solder alloy sheath; the flux core is wrapped in the brazing alloy sheath and comprises a low-melting flux-cored wire and an intermediate brazing flux filled around the low-melting flux-cored wire; the intermediate soldering flux is used for brazing alloy sheaths; the low-melting flux-cored wire comprises a low-melting brazing filler metal sheath and a low-melting brazing flux inner core wrapped by the low-melting brazing filler metal sheath. According to the flux-cored solder, the flux-cored core in the low-melting flux-cored wire is firstly melted to remove the oxide film on the surface of the base metal, then the low-melting flux-cored wire is melted to joint, the flux layer wrapped by the solder alloy sheath is melted along with the increase of the soldering temperature, the superheat degree of the low-melting flux-cored wire is increased, the joint filling performance is improved, the solder alloy sheath is melted and is in solid solution combination with the low-melting solder sheath, and therefore a soldered joint with a long joint filling length is obtained under the condition that the seam filling performance is guaranteed.
Description
Technical Field
The utility model belongs to the field of brazing materials, and particularly relates to a flux-cored brazing filler metal with excellent gap filling performance.
Background
During brazing, the brazing filler metal melts into a liquid state and the base material is kept in a solid state, and the liquid brazing filler metal wets in gaps of the base material or on the surface of the base material, flows in a capillary mode, fills, spreads, interacts with the base material (dissolves, diffuses or generates intermetallic compounds), and is cooled and solidified to form a firm joint.
In addition to the problems related to wetting and spreading of the brazing filler metal on the base metal, the flow of the brazing filler metal and the capillary gap filling process are also vital components in brazing. With the continuous development of the brazing structural part towards the precision direction, the reserved brazing seam clearance is smaller and smaller, and the requirement on the joint filling performance of the brazing filler metal is higher and higher. The brazing material with excellent performance is beneficial to precisely controlling the size of the whole brazed structural part, optimizing the quality of a brazed joint and providing product support for the feasibility of new material connection.
Factors influencing the brazing filler metal joint filling mainly include temperature, reserved gaps, wettability between liquid brazing filler metal and solid brazing metal and the like. In brazing, the liquid brazing filler metal is required to fill the entire gap of the brazing gap, not to spread freely along the surface of the solid base metal. The liquid solder flows in the brazing seam gap by virtue of capillary action, and whether the brazing seam is completely filled directly influences the performance of a welding joint.
In order to improve the joint filling performance of the solder, low-melting-point elements such as Sn, In and the like are usually added into the traditional copper-based solder or silver-based solder, and the solder is produced through the working procedures of smelting, casting, rolling, extruding, drawing and the like. The dosage of the low-melting-point element needs to be controlled in production, so that the content of the low-melting-point element is prevented from being too high, otherwise, the plasticity of the material is obviously reduced, the material is easy to become brittle and difficult to form by a conventional processing method. On the premise of meeting production requirements, the addition amount of the low-melting-point element is always required to be maintained at a low level, which limits further improvement of the joint filling performance of the existing brazing filler metal.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a flux-cored solder, which further improves the joint filling performance of the solder.
In order to realize the purpose, the technical scheme of the flux-cored solder is as follows:
a flux cored solder comprising:
a brazing filler metal alloy sheath;
the flux core is wrapped in the brazing alloy sheath and comprises a low-melting flux-cored wire and an intermediate brazing flux filled around the low-melting flux-cored wire; the intermediate soldering flux is used for brazing alloy sheaths;
the low-melting flux-cored wire comprises a low-melting brazing filler metal sheath and a low-melting brazing flux inner core wrapped by the low-melting brazing filler metal sheath; the low-melting brazing flux inner core is a brazing flux for a low-melting brazing filler metal sheath;
the melting point of the low-melting brazing flux inner core is lower than that of the low-melting brazing flux outer skin; the melting point of the low-melting brazing filler metal sheath is lower than that of the brazing filler metal alloy sheath.
According to the flux-cored solder, the flux-cored core in the low-melting flux-cored wire is firstly melted to remove the oxide film on the surface of the base metal, then the low-melting flux-cored wire is melted to joint, the flux layer wrapped by the solder alloy sheath is melted along with the increase of the soldering temperature, the superheat degree of the low-melting flux-cored wire is increased, the joint filling performance is improved, the solder alloy sheath is melted and is in solid solution combination with the low-melting solder sheath, and therefore a soldered joint with a long joint filling length is obtained under the condition that the seam filling performance is guaranteed.
Preferably, the solder alloy sheath is a silver-based solder or a copper-based solder. The brazing flux for the brazing alloy sheath is a brazing flux matched with corresponding brazing filler metal, for example, the brazing alloy sheath is silver-based brazing filler metal, and the brazing flux can be silver brazing flux matched with the silver-based brazing filler metal.
Preferably, the thickness of the brazing filler metal alloy sheath is 0.1-1 mm. More preferably, the intermediate flux forms a filler layer filled between the solder alloy sheath and the low-melting flux-cored wire, and the thickness of the filler layer is 1.5 times or more of the thickness of the solder alloy sheath.
Preferably, the intermediate brazing flux is brazing flux powder.
Preferably, the low melting solder sheath is a tin-based solder. The tin-based solder has the characteristic of low melting point, has good fluidity after being melted, and can form good solid solution combination with main solder varieties such as silver-based solder, copper-based solder and the like. By adopting the structure form, the content of the low-melting element is high and can be accurately controlled.
Preferably, the diameter of the low-melting-point flux-cored wire is 0.5-3.0 mm. More preferably, the diameter of the low-melting brazing flux inner core is 0.3-2.5 mm.
In order to more conveniently realize the forming processing of the flux-cored solder, preferably, the solder alloy sheath is formed into a tubular structure by inward rolling of a solder alloy strip, and the flux core is wrapped by lapping of two opposite side edges of the solder alloy strip.
Drawings
FIG. 1 is a schematic structural view of a flux cored solder of the present invention;
in the figure, 1-brazing alloy outer skin, 2-low melting flux inner core, 3-low melting brazing flux outer skin and 4-intermediate brazing flux.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The specific embodiment of the flux-cored solder of the utility model is shown in figure 1 and comprises a solder alloy sheath 1 and a flux core wrapped by the solder alloy sheath 1.
The flux core comprises a low-melting flux-cored wire, and the low-melting flux-cored wire comprises a low-melting flux inner core 2 and a low-melting solder outer skin 3 wrapping the low-melting flux inner core 2. The low-melting flux-cored wire is positioned in the center of the flux-cored solder, an annular space is formed between the low-melting flux-cored wire and the alloy sheath of the solder, and the flux core further comprises an intermediate soldering flux 4 filled in the annular space.
The brazing filler metal alloy sheath 1 is formed by rolling a brazing filler metal alloy strip into a tubular structure, the tubular structure is provided with a lap joint structure formed by lapping two opposite side edges of the brazing filler metal alloy strip, and the flux core is wrapped in the brazing filler metal alloy sheath through the lap joint structure.
In the embodiment, the thickness of the brazing alloy sheath is 0.2mm, BAg25CuZn alloy is selected, and QJ308 is selected as matching brazing flux. The sheath of the low-melting flux-cored wire is Sn99.3Cu0.7, the diameter is 1.0mm, the matched flux-cored soldering flux is rosin, and the diameter is 0.5 mm. The diameter of the finally prepared flux-cored solder is 2.5 mm.
The process for manufacturing the flux-cored solder of the embodiment is as follows: a BAg25CuZn solder alloy strip is rolled for multiple times to form a U-shaped opening, a Sn99.3Cu0.7 seamless flux-cored low-melting solder wire (low-melting flux-cored wire) is arranged at the center of the U-shaped opening, flux-cored solder with the diameter of 2.5mm is formed by flux powder QJ308 feeding, opening closing and drawing, and the sample is used as a test sample.
The comparative sample preparation process was as follows: the BAg25CuZn solder alloy strip is rolled into a U-shaped opening in multiple passes, and flux-cored solder with the diameter of 2.5mm is formed by solder powder QJ308 feeding, opening closing and drawing, and the sample is used as a comparison sample.
The two samples are subjected to induction brazing Bundy tube testing, the same induction brazing process and automatic wire feeding speed are selected, the base metal is a splicing Bundy tube with the diameter of 6.0mm, the splicing depth is 20mm, and the splicing gap is 0.2 mm. When soldering, the pipe joint is heated by adopting an induction heating mode, when the temperature of the pipe joint is 30-80 ℃ higher than the liquidus temperature of the sheath of the brazing filler metal alloy, the wire is fed for filling, and the brazing filler metal wire is melted to fill the gap of the pipe joint to form the soldered joint. After induction brazing, the joint filling performance is detected by adopting a method of measuring the depth of a welding seam by cutting a longitudinal surface, and five brazed joints are taken for each sample, and the average value of the five brazed joints is taken. The depth of the joint filling of the test sample is 16.5mm, and the depth of the joint filling of the comparison sample is 12.7mm, which shows that the joint filling performance of the test sample is superior to that of the comparison sample, namely the flux-cored solder has excellent joint filling performance.
In other embodiments of the flux-cored solder of the present invention, the solder alloy sheath may be a copper-based solder, and the flux powder is selected to match the flux variety of the copper-based solder. The thickness of the brazing alloy sheath can be different from 0.1 mm, 0.5mm, 0.8 mm and 1.0mm according to factors such as brazing joint gaps, brazing joint strength, brazing material wettability, brazing manufacturability and the like; the diameter of the low-melting flux-cored wire can be selected from 0.5, 1.0, 2.0 and 3.0mm, and the diameter of the low-melting flux-cored wire can be selected from 0.3, 0.8, 1.8 and 2.8 mm.
Claims (8)
1. A flux cored solder, comprising:
a brazing filler metal alloy sheath;
the flux core is wrapped in the brazing alloy sheath and comprises a low-melting flux-cored wire and an intermediate brazing flux filled around the low-melting flux-cored wire; the intermediate soldering flux is used for brazing alloy sheaths;
the low-melting flux-cored wire comprises a low-melting brazing filler metal sheath and a low-melting brazing flux inner core wrapped by the low-melting brazing filler metal sheath; the low-melting brazing flux inner core is a brazing flux for a low-melting brazing filler metal sheath;
the melting point of the low-melting brazing flux inner core is lower than that of the low-melting brazing flux outer skin; the melting point of the low-melting brazing filler metal sheath is lower than that of the brazing filler metal alloy sheath.
2. The flux cored solder of claim 1, wherein the solder alloy sheath is a silver-based solder or a copper-based solder.
3. The flux cored solder according to claim 1 or 2, wherein the thickness of the solder alloy sheath is 0.1 to 1 mm.
4. The flux cored solder of claim 3, wherein the intermediate flux forms a filler layer filled between the solder alloy sheath and the low melting flux cored wire, the filler layer having a thickness of 1.5 times or more the thickness of the solder alloy sheath.
5. The flux cored solder of claim 1, wherein the low melting solder skin is a tin based solder.
6. The flux-cored solder according to claim 1 or 5, wherein the low-melting flux-cored wire has a diameter of 0.5 to 3.0 mm.
7. The flux cored solder according to claim 6, wherein the diameter of the low melting flux core is 0.3 to 2.5 mm.
8. A flux cored solder according to claim 1, 2 or 5, wherein the solder alloy sheath is formed by internally coiling a solder alloy strip into a tubular structure, and the opposite sides of the solder alloy strip are lapped to wrap the flux core.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121478224.5U CN215658547U (en) | 2021-06-30 | 2021-06-30 | Flux-cored brazing filler metal |
| DE202022101184.2U DE202022101184U1 (en) | 2021-06-30 | 2022-03-03 | Solder with filler core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121478224.5U CN215658547U (en) | 2021-06-30 | 2021-06-30 | Flux-cored brazing filler metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215658547U true CN215658547U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121478224.5U Active CN215658547U (en) | 2021-06-30 | 2021-06-30 | Flux-cored brazing filler metal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN215658547U (en) |
| DE (1) | DE202022101184U1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115488543A (en) * | 2022-09-06 | 2022-12-20 | 郑州机械研究所有限公司 | Flux-cored welding ring and preparation method thereof |
-
2021
- 2021-06-30 CN CN202121478224.5U patent/CN215658547U/en active Active
-
2022
- 2022-03-03 DE DE202022101184.2U patent/DE202022101184U1/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115488543A (en) * | 2022-09-06 | 2022-12-20 | 郑州机械研究所有限公司 | Flux-cored welding ring and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE202022101184U1 (en) | 2022-03-09 |
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