CN114029574A - Brazing method of TC4 titanium alloy sheet corrugated grid - Google Patents
Brazing method of TC4 titanium alloy sheet corrugated grid Download PDFInfo
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- CN114029574A CN114029574A CN202111492925.9A CN202111492925A CN114029574A CN 114029574 A CN114029574 A CN 114029574A CN 202111492925 A CN202111492925 A CN 202111492925A CN 114029574 A CN114029574 A CN 114029574A
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- titanium alloy
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/14—Titanium or alloys thereof
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Abstract
A TC4 titanium alloy sheet corrugated grid brazing method, TC4 titanium alloy sheet corrugated grid contain TC4 titanium alloy upper wall board, TC4 titanium alloy lower wall board and TC4 titanium alloy corrugated grid board, lay the welding brazing filler metal on the upper surface and lower surface fixed point of TC4 titanium alloy corrugated grid board; pre-assembling an upper TC4 titanium alloy wall plate, a lower TC4 titanium alloy wall plate and a TC4 titanium alloy corrugated grid plate which is laid with welding solder into a TC4 titanium alloy thin plate corrugated grid structure; then the pre-assembled TC4 titanium alloy thin plate corrugated grid structure is placed into a brazing furnace, and the brazing furnace is vacuumized to be lower than 2.0 x 10‑2After Pa, the temperature is increased to 900-930 ℃ for brazing; and after the brazing is finished, cooling the TC4 titanium alloy sheet corrugated grid structure to below 200 ℃ along with a brazing furnace, and moving out of the brazing furnace for natural cooling.
Description
Technical Field
The invention relates to the technical field of titanium alloy part welding, in particular to a manufacturing method of a TC4 titanium alloy thin plate corrugated grid structure part.
Background
The titanium alloy has the advantages of high specific strength and specific rigidity, good corrosion resistance, excellent high-temperature mechanical property and the like, and has unique advantages for the titanium alloy brazing of structures with precise thin walls and complicated structures or needing large-area welding. Therefore, the welding rod is widely applied to important structural parts with precise thin walls and complex structures or needing large-area welding in the fields of aviation, aerospace aircrafts and the like.
The vacuum brazing is a connection method that a metal material with a melting point lower than that of a base metal is used as a brazing filler metal, and the heating temperature in a heating chamber of a brazing furnace in a vacuum box is lower than the solidus line of the base metal and higher than the liquidus line of the brazing filler metal. When the connected parts and the brazing filler metal are heated to be molten, the liquid brazing filler metal is used for wetting, spreading and mutual dissolution and diffusion with the base metal on the surface of the base metal, and wetting, spreading capillary flow, filling and mutual dissolution and diffusion with the base metal on the surface of the base metal to form the metal connection method of metallurgical bonding. Vacuum brazing belongs to solid phase connection, and is different from a fusion welding method in that a base material is not melted during vacuum brazing.
In order to reduce the temperature of an exhaust pipe of an airplane, increase the infrared stealth effect and enhance the performances of vibration resistance, tearing resistance and the like, a corrugated interlayer grid structure is added on an inner skin to increase the ventilation capacity, and the aim of enabling cooling gas between an interlayer of the inner skin and an interlayer of the outer skin to enter an exhaust channel to achieve the purpose of rapid cooling is achieved. The corrugated grid material is TC4 titanium alloy, and the thickness of the material is 0.8 mm-1.2 mm. However, the cold forming of the TC4 titanium alloy inevitably has the problems of poor deformation precision and large deformation resilience, and the welding of corrugated grid parts cannot avoid the defects of low accessibility, poor mechanical property and the like.
Disclosure of Invention
The invention provides a manufacturing method of a TC4 titanium alloy sheet corrugated grid structure part, which aims to reduce the temperature of an aircraft exhaust pipe, increase the infrared stealth effect, enhance the performances of vibration resistance, tearing resistance and the like and enable cooling gas between an inner skin interlayer and an outer skin interlayer to enter an exhaust channel to be rapidly cooled.
By adopting the TC4 titanium alloy hot forming technology and the TC4 titanium alloy vacuum brazing technology, the corrugated grid structure part manufactured by the method has the advantages that the attaching clearance is within 0.1mm, the integral deformation of the part is within 0.5mm/1m, the weight meets the design requirement, the normal-temperature mechanical property and the high-temperature mechanical property are excellent, and the like, and the method becomes the optimal method for manufacturing the corrugated grid structure part.
A method for brazing TC4 titanium alloy thin plate corrugated grid, wherein the TC4 titanium alloy thin plate corrugated grid comprises a TC4 titanium alloy upper wall plate, a TC4 titanium alloy lower wall plate and a TC4 titanium alloy corrugated grid plate, and is characterized by comprising the following steps of: 1) welding solders are laid on the upper surface and the lower surface of the TC4 titanium alloy corrugated grid plate at fixed points; 2) pre-assembling an upper TC4 titanium alloy wall plate, a lower TC4 titanium alloy wall plate and a TC4 titanium alloy corrugated grid plate which is laid with welding solder into a TC4 titanium alloy thin plate corrugated grid structure; 3) then the pre-assembled TC4 titanium alloy thin plate corrugated grid structure is placed into a brazing furnace, and the brazing furnace is vacuumized to be lower than 2.0 x 10-2After Pa, the temperature is increased to 900-930 ℃ for brazing; 4) after the brazing is finished, cooling the corrugated grid structure of the TC4 titanium alloy sheet to be below 200 ℃ along with a brazing furnace; 5) and (4) moving the cooled TC4 titanium alloy sheet corrugated grid structure out of the brazing furnace for natural cooling.
In the step 3), when the brazing furnace is heated, the temperature in the brazing furnace is firstly heated to 300-350 ℃ and is preserved for 30-45 minutes, then the temperature is heated to 600-650 ℃ and is preserved for 30-45 minutes, then the temperature is heated to 900-930 ℃ and is preserved for 30-45 minutes, the heating speed of the brazing furnace is 8-12 ℃/minute, and the vacuum pressure in the heat preservation and cooling stage is lower than 2.0 multiplied by 10-2Pa。
The beneficial effect of this application lies in: 1) in the method, the TC4 titanium alloy corrugated grid plate is prefabricated by adopting a hot forming method, so that the problems of poor deformation precision and large deformation resilience of the titanium alloy in cold forming are solved.
2) According to the method, the brazing filler metal Ti57CuZrNi is adopted in the vacuum brazing furnace to perform heating brazing on the TC4 titanium alloy upper wall plate, the TC4 titanium alloy lower wall plate and the TC4 titanium alloy corrugated grid plate, so that the defects of low accessibility in welding, poor mechanical property and the like are overcome.
3) The corrugated grid structure part manufactured by the method has the advantages that the fit clearance is within 0.1mm, the integral deformation of the part is within 0.5-1 mm, the weight meets the design requirement, the normal-temperature mechanical property and the high-temperature mechanical property are excellent, and the like, and the method becomes the optimal method for manufacturing the corrugated grid structure part.
The present application is described in further detail below with reference to the following example figures:
drawings
Fig. 1 is a schematic diagram of a TC4 titanium alloy thin plate corrugated grid structure.
Fig. 2 is a schematic diagram of spot-laying welding solders on the upper surface and the lower surface of a TC4 titanium alloy corrugated board.
Fig. 3 is a schematic cross-sectional structure of a preassembled TC4 titanium alloy thin plate corrugated grid.
The numbering in the figures illustrates: 1TC4 titanium alloy upper wall plate, 2TC4 titanium alloy lower wall plate, 3TC4 titanium alloy corrugated grid plate and 4 welding solder.
Detailed Description
Referring to the drawings, the TC4 titanium alloy thin plate corrugated grid structure proposed by the present application comprises a TC4 titanium alloy upper wall plate 1, a TC4 titanium alloy lower wall plate 2 and a TC4 titanium alloy corrugated grid plate 3, and it is necessary to weld the TC4 titanium alloy upper wall plate 1 and the TC4 titanium alloy lower wall plate 2 to the upper surface and the lower surface of the prefabricated TC4 titanium alloy corrugated grid plate 3 by welding.
In the implementation, the TC4 titanium alloy corrugated grid plate is prefabricated by adopting a thermal forming method, and the welding brazing filler metal is titanium-based foil-shaped brazing filler metal with the molecular formula of Ti57CuZrN i.
The welding brazing filler metal 4 is laid on the upper surface and the lower surface of the TC4 titanium alloy corrugated grid plate 3 at fixed points through resistance welding, and the areas of the welding brazing filler metal 4 are respectively matched with the upper surface and the lower surface of the TC4 titanium alloy corrugated grid plate 3; then pre-assembling the TC4 titanium alloy upper wall plate 1, the TC4 titanium alloy lower wall plate 2 and the TC4 titanium alloy corrugated grid plate 4 with the welding solder 4 laid into a TC4 titanium alloy thin plate corrugated grid structure by resistance welding; finally, the pre-assembled TC4 titanium alloy sheet corrugated grid structure is placed into a brazing furnace, and the brazing furnace is vacuumized to be lower than 2.0 x 10-2After Pa, the temperature is increased to 900-930 ℃ for brazing, and after brazing is finished, the corrugated grid structure of the TC4 titanium alloy sheet is cooled to below 200 ℃ along with a brazing furnace; and finally, moving the cooled TC4 titanium alloy sheet corrugated grid structure out of a brazing furnace for natural cooling.
Example one
When the temperature of the brazing furnace is raised, the temperature in the brazing furnace is raised to 300 ℃ and is kept for 30 minutes, then the temperature is raised to 600 ℃ and is kept for 30 minutes, then the temperature is raised to 900 ℃ and is kept for 45 minutes, the temperature raising speed of the brazing furnace is 10 ℃/minute, and the vacuum pressure in the heat preservation and cooling stage is lower than 2.0 multiplied by 10-2Pa. And then cooling the part to below 200 ℃ along with the furnace, discharging the part out of the furnace and air cooling the part.
Example two
When the temperature of the brazing furnace is raised, the temperature in the brazing furnace is raised to 350 ℃ and is kept for 45 minutes, then the temperature is raised to 650 ℃ and is kept for 45 minutes, then the temperature is raised to 930 ℃ and is kept for 30 minutes, the temperature raising speed of the brazing furnace is 12 ℃/minute, and the vacuum pressure in the heat preservation and cooling stage is lower than 2.0 multiplied by 10-2Pa. And then cooling the part to below 200 ℃ along with the furnace, discharging the part out of the furnace and air cooling the part.
Claims (4)
1. A method for brazing TC4 titanium alloy thin plate corrugated grid, wherein the TC4 titanium alloy thin plate corrugated grid comprises a TC4 titanium alloy upper wall plate, a TC4 titanium alloy lower wall plate and a TC4 titanium alloy corrugated grid plate, and is characterized by comprising the following steps of: 1) welding solders are laid on the upper surface and the lower surface of the TC4 titanium alloy corrugated grid plate at fixed points; 2) pre-assembling an upper TC4 titanium alloy wall plate, a lower TC4 titanium alloy wall plate and a TC4 titanium alloy corrugated grid plate which is laid with welding solder into a TC4 titanium alloy thin plate corrugated grid structure; 3) then the pre-assembled TC4 titanium alloy thin plate corrugated grid structure is placed into a brazing furnace, and the brazing furnace is vacuumized to be lower than 2.0 x 10-2After Pa, the temperature is increased to 900-930 ℃ for brazing; 4) after the brazing is finished, cooling the corrugated grid structure of the TC4 titanium alloy sheet to be below 200 ℃ along with a brazing furnace; 5) and (4) moving the cooled TC4 titanium alloy sheet corrugated grid structure out of the brazing furnace for natural cooling.
2. The method for brazing the corrugated grid of TC4 titanium alloy sheets as claimed in claim 1, wherein in step 3), the temperature in the brazing furnace is raised to 300-350 ℃ and maintained for 30-45 minutes, then raised to 600-650 ℃ and maintained for 30-45 minutes, and then raised to 900-930 ℃ and maintained for 3 minutesThe temperature is 30-45 minutes, the temperature rise speed of the brazing furnace is 8-12 ℃/min, and the vacuum pressure in the heat preservation and cooling stage is lower than 2.0 multiplied by 10-2Pa。
3. The method for brazing the corrugated grid of the TC4 titanium alloy sheet as claimed in claim 1, wherein the brazing filler metal is titanium-based foil-like brazing filler metal of the formula Ti57 CuZrNi.
4. The method of brazing a corrugated grid of TC4 titanium alloy sheets as claimed in claim 1, wherein the corrugated grid of TC4 titanium alloy sheets is prefabricated by thermoforming.
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| CN202111492925.9A CN114029574A (en) | 2021-12-08 | 2021-12-08 | Brazing method of TC4 titanium alloy sheet corrugated grid |
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Citations (7)
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| JP2010214379A (en) * | 2009-03-13 | 2010-09-30 | Furukawa-Sky Aluminum Corp | Thin-walled brazing sheet fin material for high-temperature brazing, and method for manufacturing heat exchanger using the same |
| CN106672248A (en) * | 2016-12-26 | 2017-05-17 | 中国航空工业集团公司西安飞机设计研究所 | Ejection structure |
| CN108340093A (en) * | 2018-02-07 | 2018-07-31 | 郑州大学 | Titanium-based amorphous solder preparation method and application is in connection TC4 titanium alloys and 304 stainless steels |
| CN110303750A (en) * | 2018-03-27 | 2019-10-08 | 波音公司 | Energy absorption composite panel |
| RU2717446C1 (en) * | 2019-11-25 | 2020-03-23 | федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский ядерный университет "МИФИ" (НИЯУ МИФИ) | Method of soldered connection of alumina ceramic with titanium alloy bt1-0 |
| CN111633356A (en) * | 2020-06-09 | 2020-09-08 | 北京普惠三航科技有限公司 | Brazing filler metal suitable for TC4 titanium alloy thin-wall honeycomb structure and preparation method and brazing method thereof |
| CN112872523A (en) * | 2021-01-18 | 2021-06-01 | 衢州学院 | Brazing method for welding titanium-based high-entropy alloy and silicon nitride ceramic |
-
2021
- 2021-12-08 CN CN202111492925.9A patent/CN114029574A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010214379A (en) * | 2009-03-13 | 2010-09-30 | Furukawa-Sky Aluminum Corp | Thin-walled brazing sheet fin material for high-temperature brazing, and method for manufacturing heat exchanger using the same |
| CN106672248A (en) * | 2016-12-26 | 2017-05-17 | 中国航空工业集团公司西安飞机设计研究所 | Ejection structure |
| CN108340093A (en) * | 2018-02-07 | 2018-07-31 | 郑州大学 | Titanium-based amorphous solder preparation method and application is in connection TC4 titanium alloys and 304 stainless steels |
| CN110303750A (en) * | 2018-03-27 | 2019-10-08 | 波音公司 | Energy absorption composite panel |
| RU2717446C1 (en) * | 2019-11-25 | 2020-03-23 | федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский ядерный университет "МИФИ" (НИЯУ МИФИ) | Method of soldered connection of alumina ceramic with titanium alloy bt1-0 |
| CN111633356A (en) * | 2020-06-09 | 2020-09-08 | 北京普惠三航科技有限公司 | Brazing filler metal suitable for TC4 titanium alloy thin-wall honeycomb structure and preparation method and brazing method thereof |
| CN112872523A (en) * | 2021-01-18 | 2021-06-01 | 衢州学院 | Brazing method for welding titanium-based high-entropy alloy and silicon nitride ceramic |
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