CN110906070A - Copper-aluminium welded pipe - Google Patents
Copper-aluminium welded pipe Download PDFInfo
- Publication number
- CN110906070A CN110906070A CN201911190656.3A CN201911190656A CN110906070A CN 110906070 A CN110906070 A CN 110906070A CN 201911190656 A CN201911190656 A CN 201911190656A CN 110906070 A CN110906070 A CN 110906070A
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- China
- Prior art keywords
- pipe
- necking part
- copper
- aluminum
- welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/08—Soldered joints
Abstract
The invention discloses a copper-aluminum welded pipe, which comprises a copper pipe and an aluminum pipe, wherein the aluminum pipe is of a straight pipe structure, one end of the copper pipe is provided with a first necking part and a second necking part, the outer diameter of the first necking part is smaller than that of the second necking part, and the first necking part and the second necking part are connected through a circular table top; the second necking part is in interference fit with the pipe hole of the aluminum pipe. The advantages are that: the invention has large contact area, good fusion degree after welding and high welding strength.
Description
Technical Field
The invention belongs to the technical field of welded pipes, and particularly relates to a copper-aluminum welded pipe.
Background
At present, a copper pipe has the characteristics of high pressure resistance, corrosion resistance and long service life, so that the copper pipe is widely applied to some refrigeration equipment, such as the fields of air conditioners and refrigerators; however, since copper is expensive, in order to save cost, the copper-aluminum welded tube is mostly used for conducting air flow; however, the existing copper-aluminum pipe is formed by electrifying, melting and welding, and the structure before welding is as follows: a necking part is arranged at the welding part of the copper pipe (see figure 1), the rear end of the necking part is provided with a welding inclined plane, and the pipe orifice of the aluminum pipe is abutted against the welding inclined plane; when the structure is used for power-on welding (the copper pipe and the aluminum pipe are in contact for power-on hot melting), because the contact surface between the pipe orifice of the aluminum pipe and the welding inclined plane is less, the hot melting area of the pipe orifice of the aluminum pipe is less, the pipe orifice is easy to break during extrusion, and meanwhile, because the hot melting contact area is less after the structure is welded, the fusion degree of the welding position is poorer, and the welding strength is lower; in addition, the molten metal on the necking part of the copper pipe is easy to block the inner pipe orifice after the copper pipe is hot-melted; there is a need for improvement.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a copper-aluminum welded pipe which has the characteristics of large contact surface, good fusion degree after welding and high welding strength.
In order to achieve the purpose, the invention adopts the technical scheme that: a copper-aluminum welded pipe comprises a copper pipe and an aluminum pipe, wherein the aluminum pipe is of a straight pipe structure, one end of the copper pipe is provided with a first necking part and a second necking part, the outer diameter of the first necking part is smaller than that of the second necking part, and the first necking part and the second necking part are connected through a round table top; the second necking part is in interference fit with the pipe hole of the aluminum pipe.
The outer diameters of the copper pipe and the aluminum pipe are equal.
The joint of the second necking part and the circular table surface is of a round angle structure.
The difference between the outer diameters of the second necking part and the first necking part is 0.4-1 mm.
After adopting the structure, compared with the prior art, the invention has the advantages that: the second necking part is in interference fit with the pipe hole of the aluminum pipe, so that the contact surface is larger during welding, the fusion degree is good, and the welding strength is higher; meanwhile, the first necking part and the inner wall of the aluminum pipe are provided with a gap, so that molten metal hot-melted between the second necking part and the inner wall of the aluminum pipe can be filled into the gap, the welding strength is enhanced, and the phenomenon that the molten metal blocks the pipe orifice is avoided.
Drawings
Fig. 1 is a schematic view of a conventional copper pipe structure.
FIG. 2 is a schematic plan view of the present invention.
Fig. 3 is a cross-sectional view of the present invention.
Detailed Description
The following description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention, and the present invention is further described with reference to the accompanying drawings and embodiments.
Examples, see fig. 2 and 3: a copper aluminum welded pipe comprises a copper pipe 10 and an aluminum pipe 20, wherein the aluminum pipe 20 is of a straight pipe structure, the outer diameters of the copper pipe 10 and the aluminum pipe 20 are equal, and the welding ends of the copper pipe 10 and the aluminum pipe 20 can be flush after welding. The copper pipe 10 has a first throat portion 11 and a second throat portion 12 at one end, the outer diameter of the first throat portion 11 is smaller than the outer diameter of the second throat portion 12, and the difference between the outer diameters is 0.4 to 1mm, and generally 0.6mm or 0.7mm is selected. The first necking part and the second necking part 11 and 12 are connected through a round table surface 13, the joint of the second necking part 12 and the round table surface 13 is of a round angle structure, and the round table surface 13 can conveniently enable the copper pipe 10 to be smoothly inserted into the aluminum pipe 20 during welding. A welding extrusion inclined plane 14 is arranged between the second necking part 11 and the pipe body on the copper pipe 20, the second necking part 12 is in interference fit with the pipe hole of the aluminum pipe 20, an outward-opened inclined plane is arranged at the pipe orifice of the aluminum pipe 20, the angle of the inclined plane is the same as the inclination angle of the welding extrusion inclined plane 14, and the inner end surface of the inclined plane is tightly attached to the outer surface of the welding extrusion inclined plane 14, so that the extrusion can be smooth; after the insertion, the first necking part 11 has a certain clearance with the inner wall of the aluminum pipe 20. During welding, the copper pipe 10 and the aluminum pipe 20 are inserted into each other, and are electrified and generate high temperature at the contact surface when in contact, so that the outer peripheral surface of the copper pipe 10 and the inner peripheral surface of the aluminum pipe 20 are hot melted, and the outer peripheral surface of the welding extrusion inclined surface 14 is fused into the aluminum pipe 20 after extrusion until the pipe orifice of the aluminum pipe 20 is flush with the peripheral surface of the copper pipe 10; the molten metal flows into the gap between the first necking part 11 and the aluminum pipe 20, so that the welding strength can be enhanced while the pipe orifice is prevented from being blocked. According to the invention, the second necking part 12 is in interference fit with the pipe hole of the aluminum pipe 20, namely, the outer peripheral surface of the second necking part 12 is completely contacted with the inner wall of the aluminum pipe 20, so that the fusion degree after welding is good and the welding strength is high due to more contact surfaces.
Claims (4)
1. The utility model provides a copper aluminium welded tube, includes copper pipe (10) and aluminum pipe (20), aluminum pipe (20) are the straight tube structure, its characterized in that: one end of the copper pipe (10) is provided with a first necking part (11) and a second necking part (12), the outer diameter of the first necking part (11) is smaller than that of the second necking part (12), and the first necking part and the second necking part are connected through a circular table top (13); the second necking part (12) is in interference fit with the pipe hole of the aluminum pipe (20).
2. The copper aluminum welded tube of claim 1, wherein: the outer diameters of the copper pipe (10) and the aluminum pipe (20) are equal.
3. The copper aluminum welded pipe according to claim 1 or 2, characterized in that: the joint of the second necking part (12) and the round table top (13) is of a round angle structure.
4. The copper aluminum welded tube of claim 3, wherein: the difference between the outer diameters of the second necking part (12) and the first necking part (11) is 0.4-1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911190656.3A CN110906070A (en) | 2019-11-28 | 2019-11-28 | Copper-aluminium welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911190656.3A CN110906070A (en) | 2019-11-28 | 2019-11-28 | Copper-aluminium welded pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110906070A true CN110906070A (en) | 2020-03-24 |
Family
ID=69820196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911190656.3A Pending CN110906070A (en) | 2019-11-28 | 2019-11-28 | Copper-aluminium welded pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110906070A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728004A (en) * | 2023-04-26 | 2023-09-12 | 安徽兴盛达制冷铜管制造有限公司 | Copper-aluminum joint preparation process and preparation device |
-
2019
- 2019-11-28 CN CN201911190656.3A patent/CN110906070A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728004A (en) * | 2023-04-26 | 2023-09-12 | 安徽兴盛达制冷铜管制造有限公司 | Copper-aluminum joint preparation process and preparation device |
| CN116728004B (en) * | 2023-04-26 | 2024-03-15 | 安徽兴盛达制冷铜管制造有限公司 | Copper-aluminum joint preparation process and preparation device |
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