Method for brazing compact efficient titanium alloy plate-fin heat exchanger

A fin heat exchanger, titanium alloy plate technology, applied in welding equipment, heat exchange equipment, metal processing equipment and other directions, can solve the problems of low high temperature strength of joints, low fatigue strength, impact resistance, etc., to ensure the quality of operation , Improve the manufacturing quality and ensure the effect of brazing quality

Inactive Publication Date: 2010-01-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Ag-based solder has a suitable melting point, and the brazing joint has good plasticity. The disadvantage is that the Ag-based solder is very sensitive to chloride ions, which reduces the corrosion resistance of the brazed joint and the high-temperature strength of the joint.
The price of A1-based solder is cheap, the melting point is far lower than the transformation temperature of β phase, the brazing temperature is low, and the solder fluidity is good, but after brazing, there is the formation of TiAl intermetallic compounds and the aggregation of Al, and its brazed joints Disadvantages such as low strength, high brittleness, low fatigue strength, and impact resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a brazing method for a compact and high-efficiency titanium alloy plate-fin heat exchanger, the brazing method being:

[0025] 1) Parts preparation: partitions, seals, connecting pipes, etc. are processed according to the required size, and the material is TC4 alloy; the fins are stamped from 0.1mm thick TA1 titanium foil on an automatic forming machine with a forming die;

[0026] 2) Cleaning before welding: The parts of the titanium alloy plate-fin heat exchanger must be thoroughly cleaned before brazing to remove all foreign matter and grease attached to the surface; pickling is used to remove oil, dirt, and oxides, and then use Washing with high pressure water;

[0027] 3) Parts assembly and brazing material arrangement: All the connection methods of the main parts of the titanium alloy plate-fin heat exchanger, including fins, partitions, seals, and connecting pipes, are formed by one-time brazing; before assembly, in addition to strict cle...

Embodiment 2

[0038] This embodiment provides a brazing method for a compact and high-efficiency titanium alloy plate-fin heat exchanger, the brazing method being:

[0039] 1) Parts preparation: partitions, seals, connecting pipes, etc. are processed according to the required size, and the material is TC4 alloy; the fins are stamped from 0.1mm thick TA1 titanium foil on an automatic forming machine with a forming die;

[0040] 2) Cleaning before welding: The parts of the titanium alloy plate-fin heat exchanger must be thoroughly cleaned before brazing to remove all foreign matter and grease attached to the surface; pickling is used to remove oil, dirt, and oxides, and then use Washing with high pressure water;

[0041] 3) Parts assembly and brazing material arrangement: All the connection methods of the main parts of the titanium alloy plate-fin heat exchanger, including fins, partitions, seals, and connecting pipes, are formed by one-time brazing; before assembly, in addition to strict cle...

Embodiment 3

[0052] This embodiment provides a brazing method for a compact and high-efficiency titanium alloy plate-fin heat exchanger, the brazing method being:

[0053] 1) Parts preparation: partitions, seals, connecting pipes, etc. are processed according to the required size, and the material is TC4 alloy; the fins are stamped from 0.1mm thick TA1 titanium foil on an automatic forming machine with a forming die;

[0054] 2) Cleaning before welding: The parts of the titanium alloy plate-fin heat exchanger must be thoroughly cleaned before brazing to remove all foreign matter and grease attached to the surface; pickling is used to remove oil, dirt, and oxides, and then use Washing with high pressure water;

[0055] 3) Parts assembly and brazing material arrangement: All the connection methods of the main parts of the titanium alloy plate-fin heat exchanger, including fins, partitions, seals, and connecting pipes, are formed by one-time brazing; before assembly, in addition to strict cle...

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Abstract

The invention relates to a method for brazing a compact efficient titanium alloy plate-fin heat exchanger, which adopts an amorphous titanium based brazing filler metal brazing titanium alloy with lower melting point which is between 820 and 840 DEG C, wherein the optimum clearance of the amorphous titanium based brazing filler metal brazing titanium alloy is between 20 and 90 microns, the optimum brazing temperature is between 850 and 900 DEG C, the optimum brazing time is between 10 and 15 minutes, the heating rate before soaking a workpiece is between 10 and 15 DEG C per minute, the heating rate for brazing after the soaking is 15 DEG C per minute, the cooling rate for the brazing filler metal to become solid from liquid is not less than 15 DEG C per minute, and a vacuum system only can be closed when the temperature is below 150 DEG C. Through strict selection and purchase of materials, precise part machining, careful part cleaning, brazing filler metal arrangement according to a process, precise assembling and clamping, and performing brazing according to a stated brazing process, a helium gas leakage test shows that the integral leakage of the product is 9*10<-8>PaM<3>/S which is in accordance with the standard requirement.

Description

technical field [0001] The invention relates to mechanical welding science, and in particular provides a brazing method for a compact and high-efficiency titanium alloy plate-fin heat exchanger. Background technique [0002] Compared with the traditional shell-and-tube heat exchanger, the plate-fin heat exchanger has many advantages: high heat transfer efficiency, compact structure, light and firm, strong adaptability, and can be used as gas-gas, gas-liquid and liquid-liquid Heat exchange can also be used for condensation and evaporation. It can be used in reverse flow, forward flow, cross flow or wrong reverse flow, and is suitable for heat exchange of many different media in the same equipment. Therefore, the plate-fin heat exchanger is particularly widely used. For example, aluminum plate-fin heat exchangers are most widely used in industries such as automobiles and home appliances, but in petrochemical, refrigeration, medicine, atomic energy, aerospace and other fields,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20B23K101/14
Inventor 吴昌忠陈怀宁林泉洪黄春玲吴晓红陈永东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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