CN103192151B - Aluminum alloy vacuum brazing method with directional magnesium vapor slow-release - Google Patents
Aluminum alloy vacuum brazing method with directional magnesium vapor slow-release Download PDFInfo
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- CN103192151B CN103192151B CN201310129320.2A CN201310129320A CN103192151B CN 103192151 B CN103192151 B CN 103192151B CN 201310129320 A CN201310129320 A CN 201310129320A CN 103192151 B CN103192151 B CN 103192151B
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Abstract
The invention relates to an aluminum alloy vacuum brazing method with directional magnesium vapor slow-release. The method includes the specific steps: 1, placing magnesium chips into stainless steel cylinders with two ends open and open stainless steel boxes respectively by placing magnesium chips into each stainless steel cylinder and each stainless steel box; 2, placing a to-be-brazed aluminum alloy workpiece into a vacuum furnace, covering the to-be-brazed workpiece with a stainless steel process cover, placing two stainless steel boxes contained with the magnesium chips inside and outside the stainless steel cover respectively so as to decrease oxygen content in a furnace cavity and the process cover, placing more than one stainless steel cylinder nearby a brazing seam of the to-be-brazed workpiece, and enabling cylinder openings of the stainless steel cylinders to face towards the brazing seam; 3, closing a furnace door of the vacuum furnace, and heating for brazing. By the method, oxygen content in the vacuum furnace can be decreased greatly, surface oxidation and burning loss of the welded workpiece are reduced as compared with that of the prior art, brazed rate of the brazing seam is increased, and ultrasonic testing shows that cold joint area is decreased by about 20%.
Description
Technical field
The invention belongs to metal welding techniques field, be specifically related to Aluminum Alloy Vacuum Brazing technique.
Background technology
Vacuum Soldering Technology be widely used in Al and Alalloy connection manufacture in, there is welding deformation little, the advantages such as various complicated shape weldments can be welded.But vacuum generally can only reach 1.0 × 10 in vacuum drying oven
-3about Pa, due to the existence of oxygen in stove, postwelding surface of the work there will be oxidization burning loss phenomenon; And aluminum alloy surface exists the oxide-film of one deck densification, the existence of this oxide-film can reduce the wetability of solder, hinders solder sprawling on mother metal, makes soldered seam occur the defects such as rosin joint.By means of some metal activation agent, as magnesium (Mg), bismuth (Bi) etc., effectively can destroy the oxide-film of aluminum alloy surface densification, strengthen the wetability of solder.It is generally acknowledged the removal mechanism of oxide film of activator: on the one hand, oxygen residual in activator and vacuum and water react, and eliminate them to illeffects during aluminium soldering; On the other hand, under magnesium vapor infiltration film, surface material layer forms the Al-Si-Mg alloy of low melting point together with the silicon of diffusion, during soldering, this alloy melting thus destroy the combination of oxide-film and mother metal, make the solder of fusing be able to wetting mother metal, under film, mother metal is sprawled, and skin covering of the surface is floated and removes.
Summary of the invention
In order to eliminate oxygen (O remaining in vacuum brazing body of heater
2) and increase the wetability of solder, improve welding quality, the invention provides a kind of Aluminum Alloy Vacuum Brazing method with magnesium vapor directional sustained-release.
The concrete operation step with the Aluminum Alloy Vacuum Brazing method of magnesium vapor directional sustained-release is as follows:
(1) magnesium chips is put into stainless steel cylinder and stainless steel box respectively; The open at both ends of described stainless steel cylinder, is respectively equipped with four layers of nickel screen in open at both ends; Described stainless steel box is open box, adds a cover four layers of nickel screen at the box mouth of stainless steel box; Place 0.5 ~ 1g magnesium chips in each stainless steel cylinder, in each stainless steel box, place 2g magnesium chips;
(2) workpiece to be welded cleaning the aluminum or aluminum alloy assembled is put into vacuum drying oven, cover on workpiece to be welded with stainless steel art cover, and inside and outside stainless steel art cover, place the stainless steel box that is equipped with magnesium chips respectively, to reduce oxygen content in burner hearth and technique cover; The stainless steel cylinder that more than one is equipped with magnesium chips is placed near the weld seam of workpiece to be welded, and by the nozzle of stainless steel cylinder facing to weld seam;
(3) close the fire door of vacuum drying oven, heat up by the temperature curve formulated and weld.
Described stainless steel cylinder is of a size of internal diameter 6mm, length 40mm, wall thickness 1mm; Described stainless steel box is of a size of long 40mm, wide 16 mm, high 20mm, wall thickness 1mm.
The thickness of described magnesium chips is 0.1 ~ 0.2mm, and shape is web-like.
The box mouth of described stainless steel box is provided with lid, and described lid is evenly equipped with through hole.
The total amount of once welding magnesium chips used is not more than 20g.
Method of the present invention can effectively reduce oxygen content in vacuum drying oven, and postwelding surface of the work oxidization burning loss degree weakens greatly than not using this technology, and makes soldered seam ratio of brazing area greatly increase, and ultrasonic testing results display rosin joint area reduces about 20%.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
embodiment 1
Waiing upon welder's part is cold drawing and the cover plate with water channel, length 300 mm of cold drawing, width 300 mm, thickness 30 mm; Cover sheet thickness 4mm, cover plate and cold drawing material are 6061 aluminium alloys.Adopt the concrete operation step of the Aluminum Alloy Vacuum Brazing of magnesium vapor directional sustained-release as follows:
(1) magnesium chips is put into stainless steel cylinder and stainless steel box respectively; Stainless steel cylinder is of a size of internal diameter 6mm, length 40mm, wall thickness 1mm; The open at both ends of stainless steel cylinder, is respectively equipped with four layers of nickel screen in open at both ends; Described stainless steel box is of a size of long 40mm, wide 16 mm, high 20mm, wall thickness 1mm, and stainless steel box is open box, adds a cover four layers of nickel screen at the box mouth of stainless steel box.The thickness of magnesium chips is 0.1 ~ 0.2mm, and shape is web-like.Place 1g magnesium chips in each stainless steel cylinder, in each stainless steel box, place 2g magnesium chips;
(2) workpiece to be welded cleaning the aluminum or aluminum alloy assembled is put into vacuum drying oven, cover on workpiece to be welded with stainless steel art cover, and inside and outside stainless steel art cover, place the stainless steel box that is equipped with magnesium chips respectively, to reduce oxygen content in burner hearth and technique cover; The stainless steel cylinder that ten are equipped with magnesium chips is placed near the weld seam of workpiece to be welded, and by the nozzle of stainless steel cylinder facing to weld seam; The total amount of magnesium chips used is 14g;
(3) close the fire door of vacuum drying oven, heat up by following temperature-time process conditions and weld:
Homogeneous heating to 300 DEG C in 40min, insulation 30min;
400 DEG C are heated to, insulation 240min in 25min;
520 DEG C are heated to, insulation 240min in 40min;
570 DEG C are heated to, insulation 180min in 25min;
610 DEG C are heated to, insulation 180min in 25min;
540 DEG C are cooled to, insulation 50min in 10min;
500 DEG C are cooled to, insulation 30min in 5min;
400 DEG C are cooled to, insulation 95min in 15min;
300 DEG C are cooled to, insulation 240min in 15min;
In 80min, be cooled to normal temperature, complete welding.
In intensification welding process, magnesium chips acts on commissure with the form of magnesium vapor by the nozzle of stainless steel cylinder, and the magnesium chips in stainless steel box is full of in vacuum drying oven with the form of magnesium vapor.
The soldered fitting obtained is well shaping, brazed seam flawless, and ultrasound detection occurs without phenomenons such as rosin joints, meets connector instructions for use under normal circumstances.
embodiment 2
Waiing upon welder's part is cold drawing and the cover plate with water channel, length 400 mm of cold drawing, width 400 mm, thickness 30 mm; Cover sheet thickness 4mm, cover plate and cold drawing material are 6061 aluminium alloys.Adopt the concrete operation step of the Aluminum Alloy Vacuum Brazing of magnesium vapor directional sustained-release as follows:
(1) with embodiment 1;
(2) at the box lid upper box cover of stainless steel box, lid is evenly equipped with through hole; The stainless steel cylinder that 13 are equipped with magnesium chips is placed, the other the same as in Example 1 near the weld seam of workpiece to be welded; The total amount of magnesium chips used is 17g;
(3) with embodiment 1.
The soldered fitting obtained is well shaping, brazed seam flawless, and ultrasound detection occurs without phenomenons such as rosin joints, meets connector instructions for use under normal circumstances.
Claims (4)
1. there is the Aluminum Alloy Vacuum Brazing method of magnesium vapor directional sustained-release, it is characterized in that concrete operation step is as follows:
(1) magnesium chips is put into stainless steel cylinder and stainless steel box respectively; The open at both ends of described stainless steel cylinder, is respectively equipped with four layers of nickel screen in open at both ends; Described stainless steel box is open box, adds a cover four layers of nickel screen at the box mouth of stainless steel box; Place 0.5 ~ 1g magnesium chips in each stainless steel cylinder, in each stainless steel box, place 2g magnesium chips;
(2) workpiece to be welded cleaning the aluminum or aluminum alloy assembled is put into vacuum drying oven, cover on workpiece to be welded with stainless steel art cover, and inside and outside stainless steel art cover, place the stainless steel box that is equipped with magnesium chips respectively, to reduce oxygen content in burner hearth and technique cover; The stainless steel cylinder that more than one is equipped with magnesium chips is placed near the weld seam of workpiece to be welded, and by the nozzle of stainless steel cylinder facing to weld seam;
(3) close the fire door of vacuum drying oven, heat up welding.
2. there is the Aluminum Alloy Vacuum Brazing method of magnesium vapor directional sustained-release according to claim 1, it is characterized in that: described stainless steel cylinder is of a size of internal diameter 6mm, length 40mm, wall thickness 1mm; Described stainless steel box is of a size of long 40mm, wide 16mm, high 20mm, wall thickness 1mm.
3. there is the Aluminum Alloy Vacuum Brazing method of magnesium vapor directional sustained-release according to claim 1, it is characterized in that: the thickness of described magnesium chips is 0.1 ~ 0.2mm, and shape is web-like.
4. there is the Aluminum Alloy Vacuum Brazing method of magnesium vapor directional sustained-release according to claim 1, it is characterized in that: the total amount of once welding magnesium chips used is not more than 20g.
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| CN201310129320.2A CN103192151B (en) | 2013-04-16 | 2013-04-16 | Aluminum alloy vacuum brazing method with directional magnesium vapor slow-release |
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| CN103192151B true CN103192151B (en) | 2015-04-29 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105057826A (en) * | 2015-08-06 | 2015-11-18 | 贵州航天电子科技有限公司 | Vacuum brazing method for radio fuze antenna radiator |
| CN107876932A (en) * | 2017-12-15 | 2018-04-06 | 艾普尔换热器(苏州)有限公司 | A kind of soldering body of heater magnesium powder collection device |
| CN110480111B (en) * | 2019-07-31 | 2022-03-22 | 安徽博微长安电子有限公司 | Liquid cooling shell vacuum brazing method |
Citations (6)
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| JPH01228669A (en) * | 1988-03-10 | 1989-09-12 | Furukawa Alum Co Ltd | Vacuum brazing method for aluminum product |
| SU1511033A1 (en) * | 1987-07-02 | 1989-09-30 | Тольяттинский политехнический институт | Method of brazing aluminium and alloys thereof |
| JPH0579765A (en) * | 1991-07-29 | 1993-03-30 | Ishikawajima Harima Heavy Ind Co Ltd | Vacuum aluminum brazing furnace |
| JPH0985431A (en) * | 1995-09-26 | 1997-03-31 | Furukawa Electric Co Ltd:The | Vacuum brazing method for aluminum product |
| CN1836815A (en) * | 2005-03-24 | 2006-09-27 | 郜长福 | Soft vacuum brazing process for aluminum alloy workpiece |
| CN102744482A (en) * | 2012-07-31 | 2012-10-24 | 郑州机械研究所 | Vacuum brazing device and method using device to braze aluminum alloy workpiece |
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2013
- 2013-04-16 CN CN201310129320.2A patent/CN103192151B/en active Active
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| SU1511033A1 (en) * | 1987-07-02 | 1989-09-30 | Тольяттинский политехнический институт | Method of brazing aluminium and alloys thereof |
| JPH01228669A (en) * | 1988-03-10 | 1989-09-12 | Furukawa Alum Co Ltd | Vacuum brazing method for aluminum product |
| JPH0579765A (en) * | 1991-07-29 | 1993-03-30 | Ishikawajima Harima Heavy Ind Co Ltd | Vacuum aluminum brazing furnace |
| JPH0985431A (en) * | 1995-09-26 | 1997-03-31 | Furukawa Electric Co Ltd:The | Vacuum brazing method for aluminum product |
| CN1836815A (en) * | 2005-03-24 | 2006-09-27 | 郜长福 | Soft vacuum brazing process for aluminum alloy workpiece |
| CN102744482A (en) * | 2012-07-31 | 2012-10-24 | 郑州机械研究所 | Vacuum brazing device and method using device to braze aluminum alloy workpiece |
Non-Patent Citations (1)
| Title |
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| 镁在铝合金真空钎焊过程中作用的研究;张玉华等;《焊接学报》;19830630;第4卷(第2期);第55-71页 * |
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