CN112276328A - Application of vacuum electron beam welding on molybdenum-rhenium alloy welding - Google Patents
Application of vacuum electron beam welding on molybdenum-rhenium alloy welding Download PDFInfo
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- CN112276328A CN112276328A CN202011071586.2A CN202011071586A CN112276328A CN 112276328 A CN112276328 A CN 112276328A CN 202011071586 A CN202011071586 A CN 202011071586A CN 112276328 A CN112276328 A CN 112276328A
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- Prior art keywords
- welding
- molybdenum
- electron beam
- rhenium
- rhenium alloy
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Classifications
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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
- B23K15/00—Electron-beam welding or cutting
- B23K15/06—Electron-beam welding or cutting within a vacuum chamber
-
- 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
- B23K15/00—Electron-beam welding or cutting
- B23K15/0033—Preliminary treatment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
Abstract
The invention relates to the field of vacuum electron beam welding in equipment manufacturing industry, in particular to application of vacuum electron beam welding to molybdenum-rhenium alloy welding. The molybdenum-rhenium alloy is used as a material manufactured by powder metallurgy, is sensitive to environmental carbon, nitrogen and oxygen, is oxidized at high temperature and easily forms pores, brittle phases and cracks in the welding process, and realizes high-quality welding seams and molding of the molybdenum-rhenium alloy by utilizing the characteristics of various parameters of vacuum electron beam welding; the molybdenum-rhenium alloy is molybdenum alloy with 2-5% of rhenium added on the basis of molybdenum. The addition of molybdenum to rhenium can improve the plasticity and strength of molybdenum, and belongs to solid solution strengthening type alloy. The molybdenum-rhenium alloy is generally manufactured by a powder metallurgy method, the tensile strength, the ductility and the resistivity of the molybdenum-rhenium alloy increase along with the increase of the rhenium content, and the molybdenum-rhenium alloy is generally applied to thermocouple wire materials, structural materials in aerospace or high-temperature structural materials.
Description
Technical Field
The invention relates to the field of electron beam welding in equipment manufacturing industry, in particular to application of vacuum electron beam welding to molybdenum-rhenium alloy welding.
Background
Molybdenum and molybdenum alloy materials have many high-temperature application advantages, rhenium added with molybdenum can improve the plasticity of molybdenum and the strength of molybdenum, and has excellent high-temperature and low-temperature mechanical properties, and the rhenium added with molybdenum is widely applied to X-ray tube targets rotating at high speed, long-life grid plates for microwave communication, reactor core heating pipes of space reactors, heating elements of high-temperature furnaces, high-temperature thermocouples and the like, but the defects of easy generation of air holes, cracks and the like in the welding process of the existing powder metallurgy molybdenum and molybdenum alloy can not meet the product requirements.
The invention utilizes the setting optimization of the high-energy beam density and parameters of the vacuum electron beam welding to complete the welding of the molybdenum-rhenium alloy, thereby obtaining the welding line with good forming and excellent mechanical property. Promoting the application and development of molybdenum-rhenium alloy welding technology. Making it more widely applicable in various fields.
Disclosure of Invention
The invention aims to provide application of vacuum electron beam welding to molybdenum-rhenium alloy welding.
The technical scheme adopted for realizing the purpose of the invention is as follows:
the molybdenum-rhenium alloy is used as a material manufactured by powder metallurgy, is sensitive to environmental carbon, nitrogen and oxygen, is easy to oxidize at high temperature and under the condition, is easy to form pores, brittle phases and cracks in the welding process, and realizes high-quality welding seams and forming of the molybdenum-rhenium alloy by utilizing the characteristics of various parameters of vacuum electron beam welding;
1) the working distance is 400mm, and the penetrability of the electron beam is improved;
2) vacuum electron beam welding to high vacuum < 1 x 10-4mbar, which reduces the influence of air on the weld quality and effectively improves the penetrability of electron beams;
3) preheating before welding can facilitate air hole overflow and control the generation of cracks;
4) controlling the welding speed, adjusting the electron beam acceleration voltage and beam current, and controlling the heat input quantity;
5) setting the focus position of an electron beam and X and Y deflection amplitudes of a scanning function, changing the width of a welding seam and realizing the process requirement;
6) setting the type and frequency of the electron beam scanning function, adjusting the cross section shape of the welding bead, optimizing the root of the welding bead, stirring the molten pool and preventing the internal defects of the welding bead.
The invention has the advantages that:
1. the method can effectively overcome the defects of easy generation of pores, cracks, brittle fracture and the like in molybdenum-rhenium alloy welding, and provides welding technical support for the application of the molybdenum-rhenium alloy in the industrial field.
2. According to the invention, the generation of internal pores and cracks in welding is controlled by setting parameters such as electron beam welding working distance, vacuum degree, pre-welding preheating and the like, acceleration voltage, beam current size, welding speed and the like; the width of a welding seam is changed by setting the focus position of an electron beam and X and Y deflection amplitudes of a scanning function, so that the process requirement is met; by setting the type and frequency of the electron beam scanning function, the cross section shape of the welding bead is adjusted, the root of the welding bead is optimized, and the internal defects of the welding bead are prevented.
Detailed Description
The molybdenum-rhenium alloy is used as a material manufactured by powder metallurgy, is sensitive to environmental carbon, nitrogen and oxygen, is easy to oxidize at high temperature and under the condition, is easy to form pores, brittle phases and cracks in the welding process, and realizes high-quality welding seams and forming of the molybdenum-rhenium alloy by utilizing the characteristics of various parameters of vacuum electron beam welding;
1) the working distance is 400mm, and the penetrability of the electron beam is improved;
2) vacuum electron beam welding to high vacuum < 1 x 10-4mbar, which reduces the influence of air on the weld quality and effectively improves the penetrability of electron beams;
3) preheating before welding can facilitate air hole overflow and control the generation of cracks;
4) controlling the welding speed, adjusting the electron beam acceleration voltage and beam current, and controlling the heat input quantity;
5) setting the focus position of an electron beam and X and Y deflection amplitudes of a scanning function, changing the width of a welding seam and realizing the process requirement;
6) setting the type and frequency of the electron beam scanning function, adjusting the cross section shape of the welding bead, optimizing the root of the welding bead, stirring the molten pool and preventing the internal defects of the welding bead.
Examples
Adopts a 1.5mm molybdenum-rhenium alloy plate full penetration electron beam welding technology.
The gap of the assembly before welding is less than 0.03mm, and the plate step difference is less than 0.05 mm. And mechanically polishing the surface, and cleaning the welding surface by acetone.
The welding process is as follows:
working distance: 400 mm;
vacuum degree:＜1*10-4mbar；
preheating before welding: 150 ℃;
focusing current: 2580 mA;
acceleration voltage: 150 KV;
beam current: 6.5-7 mA;
speed: 150 mm/min;
function type: circular waves;
function amplitude: 0.1 mm;
function frequency: 10000 HZ;
and maintaining the pressure for 5min after welding to prevent oxidation.
Claims (1)
1. The application of vacuum electron beam welding on molybdenum-rhenium alloy welding is characterized in that the molybdenum-rhenium alloy is used as a material manufactured by powder metallurgy, is sensitive to environmental carbon, nitrogen and oxygen, is oxidized at high temperature and easily under the condition, is easy to form pores, brittle phases and cracks in the welding process, and realizes high-quality welding seams and forming of the molybdenum-rhenium alloy by utilizing the characteristics of various parameters of vacuum electron beam welding;
1) the working distance is 400mm, and the penetrability of the electron beam is improved;
2) vacuum electron beam welding to high vacuum < 1 x 10-4mbar, which reduces the influence of air on the weld quality and effectively improves the penetrability of electron beams;
3) preheating before welding can facilitate air hole overflow and control the generation of cracks;
4) controlling the welding speed, adjusting the electron beam acceleration voltage and beam current, and controlling the heat input quantity;
5) setting the focus position of an electron beam and X and Y deflection amplitudes of a scanning function, changing the width of a welding seam and realizing the process requirement;
6) setting the type and frequency of the electron beam scanning function, adjusting the cross section shape of the welding bead, optimizing the root of the welding bead, stirring the molten pool and preventing the internal defects of the welding bead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071586.2A CN112276328A (en) | 2020-10-09 | 2020-10-09 | Application of vacuum electron beam welding on molybdenum-rhenium alloy welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071586.2A CN112276328A (en) | 2020-10-09 | 2020-10-09 | Application of vacuum electron beam welding on molybdenum-rhenium alloy welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112276328A true CN112276328A (en) | 2021-01-29 |
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|---|---|---|---|
| CN202011071586.2A Pending CN112276328A (en) | 2020-10-09 | 2020-10-09 | Application of vacuum electron beam welding on molybdenum-rhenium alloy welding |
Country Status (1)
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499834A (en) * | 2016-01-27 | 2016-04-20 | 江苏科技大学 | Brazing material for brazing molybdenum-rhenium alloy, preparation method and brazing method |
| CN107009025A (en) * | 2017-04-26 | 2017-08-04 | 西安交通大学 | A kind of microalloying method for improving molybdenum and molybdenum alloy arc-seam weld obdurability |
| CN108188521A (en) * | 2018-01-25 | 2018-06-22 | 山东建筑大学 | A kind of high-frequency induction heating method for welding of Mo Re alloys foil |
| RU2664746C1 (en) * | 2017-10-11 | 2018-08-22 | Федеральное государственное унитарное предприятие "Научно-исследовательский институт Научно-производственное объединение "ЛУЧ" (ФГУП "НИИ НПО "ЛУЧ") | Method of electron-beam welding of thin-wall tubes made of molybdenum alloys |
| CN109848538A (en) * | 2018-11-29 | 2019-06-07 | 沈阳富创精密设备有限公司 | Application of the vacuum electron beam welding in tantalum alloy welding |
-
2020
- 2020-10-09 CN CN202011071586.2A patent/CN112276328A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105499834A (en) * | 2016-01-27 | 2016-04-20 | 江苏科技大学 | Brazing material for brazing molybdenum-rhenium alloy, preparation method and brazing method |
| CN107009025A (en) * | 2017-04-26 | 2017-08-04 | 西安交通大学 | A kind of microalloying method for improving molybdenum and molybdenum alloy arc-seam weld obdurability |
| RU2664746C1 (en) * | 2017-10-11 | 2018-08-22 | Федеральное государственное унитарное предприятие "Научно-исследовательский институт Научно-производственное объединение "ЛУЧ" (ФГУП "НИИ НПО "ЛУЧ") | Method of electron-beam welding of thin-wall tubes made of molybdenum alloys |
| CN108188521A (en) * | 2018-01-25 | 2018-06-22 | 山东建筑大学 | A kind of high-frequency induction heating method for welding of Mo Re alloys foil |
| CN109848538A (en) * | 2018-11-29 | 2019-06-07 | 沈阳富创精密设备有限公司 | Application of the vacuum electron beam welding in tantalum alloy welding |
Non-Patent Citations (2)
| Title |
|---|
| 李亚江等: "《高硬度材料的焊接》", 30 April 2010, 冶金工业出版社 * |
| 钟培全编译: "钼-铼合金焊缝的显微组织和机械性能", 《中国钼业》 * |
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Application publication date: 20210129 |