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Aluminum alloy vacuum welding method capable of eliminating silicon segregation

A technology of vacuum welding and aluminum alloy, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc. It can solve the problems of unreasonable parameters and low weld strength, so as to improve the uniformity of the structure, reduce the unevenness of the temperature, and avoid The effect of silicon segregation

Inactive Publication Date: 2013-04-10
GUIZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defect that the existing vacuum welding process parameters are unreasonable so that the weld strength is not high, and to provide a vacuum welding method for aluminum alloys that can eliminate silicon segregation, so that the structure of the obtained weld is uniform greatly improved sex

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  • Aluminum alloy vacuum welding method capable of eliminating silicon segregation
  • Aluminum alloy vacuum welding method capable of eliminating silicon segregation

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Embodiment Construction

[0022] Clean the aluminum alloy parts according to the conventional method, put the cleaned parts into a drying room with constant temperature and humidity control for forming assembly, calibration, and then vacuum brazing according to the following process steps and parameters:

[0023] (1) Preheating: After assembling the aluminum alloy parts to be welded and the aluminum-silicon-based solder, place them in a vacuum brazing furnace, heat them to 200-300°C at a heating rate of 8-10°C / S, keep them warm for 30min, and vacuum them. degree>5×10 -2 Pa;

[0024] (2) Membrane rupture: heat up to 540°C at a heating rate of 6-9°C / S, keep warm for 30min, and vacuum >5×10 -3 Pa;

[0025] (3) Welding: heat up to 600-620°C at a heating rate of less than 5°C / S, keep warm for 60-90min, and vacuum >3×10 -3 Pa;

[0026] (4) Cooling: The welded parts are cooled to 530°C with the furnace, and then taken out and air-cooled to room temperature.

[0027] After the vacuum welding, observe the ...

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Abstract

The invention discloses an aluminum alloy vacuum welding method capable of eliminating silicon segregation. The method comprises the following steps of: (1) preheating, namely assembling aluminum alloy to be welded and aluminum-silicon solder, placing parts into a vacuum brazing furnace, heating the parts to 200 to 300 DEG C at the heating speed of 8 to 10 DEG C / s, and preserving heat for 20 to 40 minutes at the vacuum degree of 5*10<-2> Pa; (2) breaking a membrane, namely heating to 530 to 550 DEG C at the heating speed of 6 to 9 DEG C / s and preserving heat for 20 to 40 minutes at the vacuumdegree of 5*10<-3> Pa; (3) welding, heating to 600 to 620 DEG C at the heating speed of less than 5 DEG C / s and preserving heat for 60 to 90 minutes at the vacuum degree of 3*10<-3> Pa; and (4) cooling, namely cooling the welded parts to 520 to 540 DEG C along with the furnace, taking out the parts, and performing air-cooling on the parts to room temperature. Vacuum brazing process parameters arecontrolled, so the silicon segregation phenomena are greatly reduced, even are avoided, and tissue uniformity of welding joints of aluminum alloy products is improved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy welding, in particular to an aluminum alloy vacuum welding method capable of eliminating silicon segregation. Background technique [0002] With the development of modern engineering machinery, the requirements for the strength of the brazing seam are getting higher and higher when the vacuum brazing process is used to weld aluminum alloy radiators. At present, most of the brazing filler metals used in vacuum brazing are aluminum-silicon based brazing filler metals. The segregation of a large amount of Si elements in the weld seam greatly reduces the strength of the weld seam, which is far from meeting the performance requirements. The main reason is that the understanding of vacuum brazing is not deep enough, the process parameters formulated are unreasonable, and cannot meet the requirements of weld formation, so it is difficult to produce radiator products with high-strength welds. Con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008
Inventor 赵飞陈召松梁益龙张占铃
Owner GUIZHOU UNIV
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