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Brazing repair method for local leakage of core body of vacuum brazed aluminum plate-fin heat exchanger

A repair method and brazing technology, which is applied in the direction of welding/welding/cutting objects, welding media, hollow objects, etc., can solve problems affecting the production process, etc., and achieve the expansion effect of easy operation, easy coating, and avoiding leakage defects

Inactive Publication Date: 2020-05-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat exchanger core is scrapped due to local leakage that cannot be effectively repaired, which will not only bring great direct economic losses, but also seriously affect the production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The core size of a certain type of coolant-air flow two-channel aluminum plate-fin heat exchanger is (length × width × height): 1440 × 150 × 488mm. The material of the side plate is 3003 aluminum alloy plate, the size is (length×width×thickness): 1440×150×4mm; the material of the fin is 3003 aluminum alloy plate, the thickness is 0.2mm, zigzag fin; the separator is Q515 aluminum alloy The cladding plate, the size is (length×width×thickness): 1440×150×0.8mm; the material of the seal is 3003 aluminum alloy, and the size of the airflow side cold seal is (length×width×height): 1440×8×3mm, cooling The size of the heat seal on the liquid side is (length × width × height): 150 × 12 × 9.5mm; the brazing material for brazing between the side plate and the fin and the seal is a 0.1mm thick 4004 brazing filler metal sheet, the size is (length × Width): 1440×150mm. The sealing test of the heat exchanger core after vacuum brazing found that there were 3 external leaks, all of which...

Embodiment 2

[0039] The core body size of a certain type of oil-air flow two-channel aluminum plate-fin heat exchanger is (length × width × height): 367 × 150 × 472mm. The material of the side plate is 3003 aluminum alloy plate, the size is (length×width×thickness): 367×150×6mm; the material of the fin is 3003 aluminum alloy plate, the thickness is 0.2mm, zigzag fin; the separator is Q515 aluminum alloy The size of the cladding plate is (length×width×thickness): 367×150×0.8mm; the material of the seal is 3003 aluminum alloy, and the size of the cold seal on the air flow side is (length×width×height): 367×8×3mm, engine oil The size of the side heat seal is (length × width × height): 150 × 12 × 9.5mm; the brazing material for brazing between the side plate and the fin and the seal is a 0.1mm thick 4004 brazing filler metal sheet, the size is (length × width ): 367×150mm. After the vacuum brazing of the core of the heat exchanger, the sealing test found that there was one leakage: it was loc...

Embodiment 3

[0048] The core body size of an aluminum plate-fin heat exchanger with two heat exchange channels for oil-air flow is (length×width×height): 427×102×190mm. The material of the side plate is 3003 aluminum alloy plate, the size is (length×width×thickness): 427×102×8mm; the material of the fin is 3003 aluminum alloy plate, the thickness is 0.2mm, straight fin; the separator is Q515 aluminum Alloy cladding plate, the size is (length×width×thickness): 427×102×0.8mm; the material of the seal is 3003 aluminum alloy, and the size of the airflow side cold seal is (length×width×height): 102×6×3mm, The size of the heat seal on the oil side is (length × width × height): 427 × 3 × 8mm; the brazing material for brazing between the side plate and the fins and seals is a 0.1mm thick 4004 brazing filler metal sheet, and the size is (length × width ): 427×102mm. The seal test of the heat exchanger core after vacuum brazing found that there were 3 leaks: 2 were located between the cold seal on ...

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Abstract

The invention discloses a brazing repair method for local leakage of a core body of a vacuum brazed aluminum plate-fin heat exchanger, and belongs to the technical field of aluminum alloy welding. Themethod is applied to repairing the local leakage of the core body of the vacuum brazed aluminum plate-fin heat exchanger by matching traditional oxyacetylene brazing and a paste aluminum alloy solder. The method is simple; the paste solder is easy to coat; the oxyacetylene facilitates heating; the operability and the controllability are high; and the repair qualification rate is high. The meltingpoint of the paste aluminum alloy solder is lower than 490 DEG C; and when the oxyacetylene is used for heating, the expansion of a leakage defect and the damage of a component, such as a fin, causedby great thermal stress in repairing can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy welding, and in particular relates to a rapid brazing repair method for local leakage of a core body of a vacuum brazed aluminum plate-fin heat exchanger. Background technique [0002] Aluminum plate-fin heat exchanger is a new type of high-efficiency heat exchanger with aluminum alloy corrugated fins as the heat transfer element. It is the most advanced heat exchanger at home and abroad. It is compact, small in size, light in weight, strong in adaptability, sturdy and durable, and economical, and can be designed to exchange heat with more than ten streams of fluids at the same time. It was originally used in military fields such as aviation and submarines, and is now widely used in Petrochemical, aerospace, electronics, atomic energy, ships and power machinery and other fields, and are constantly replacing traditional shell-and-tube heat exchangers, rapidly expanding their scope of applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/20B23K35/28
CPCB23K1/0008B23K1/206B23K35/025B23K35/286B23K2101/14B23K2103/10
Inventor 罗伟严密周健胡磊许文韬吴琛
Owner ZHEJIANG UNIV
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