A method for precision control of vacuum brazing of aluminum alloys

Abstract

The application discloses a method for precisely controlling aluminum alloy vacuum brazing, a magnesium element detector is installed in a vacuum brazing furnace, the monitoring position can be around the furnace body or close to the part position; by monitoring the change of the magnesium element in the vacuum brazing furnace, the melting state of the filler metal in the vacuum brazing furnace is confirmed, so that the flowability of the filler metal is controlled, and the method is particularly suitable for brazing of parts with narrow air channels / water channels, so as to prevent internal channel blockage caused by improper temperature control and holding time. The magnesium element content detector is linked with the vacuum brazing furnace for centralized control, so that the heating time of the vacuum brazing furnace is automatically controlled, and the holding time and on-off time can also be controlled. The vacuum brazing furnace judges the welding state by monitoring the magnesium content data. The application precisely controls and monitors the melting state of the welding filler metal, realizes precise welding of parts with narrow flow channels, is stable in the welding process, the welding joint surface is completely fused, the internal flow channel is not blocked, and the welding success rate is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of precision welding technology for IC equipment, aerospace components and electronic devices, specifically a method for precision control of vacuum brazing of aluminum alloys. Background Technology

[0002] The components of water-cooled plates and spray plates are widely used in fields such as IC equipment, aerospace parts, and electronic equipment. They are made of aluminum alloy. Their structure consists of 2-10 layers of sheet metal stacked together and brazed. The internal design incorporates unidirectional or spiral flow channels, which are welded to form closed or semi-closed states, allowing the flow of liquids, gases, or the reflection of light waves. The width and depth of the flow channels are typically 1mm to 20mm.

[0003] Because brazing involves heating the entire part to a temperature that reaches the melting temperature of the brazing filler metal but is lower than the melting temperature of the base material, the internal brazing filler metal melts and becomes liquid with fluidity. The flow pattern and direction need to be precisely controlled. For parts with an internal groove width of less than 5×5mm, liquid brazing filler metal often flows into the groove, clogging the flow channel and rendering the entire part unusable.

[0004] Traditional brazing methods that rely on monitoring furnace temperature and calculating holding time are unstable. They are affected by the volume of parts in the furnace each time they are heated and by different batches of brazing filler metal. It is difficult to accurately monitor key factors such as the melting state and melting time of the brazing filler metal, thus making it difficult to meet the requirements of precision brazing for multiple products. Summary of the Invention

[0005] This invention discloses a method for precisely controlling vacuum brazing of aluminum alloys. It utilizes the characteristic that the aluminum brazing filler metal and magnesium in the aluminum alloy rapidly volatilize under vacuum and certain high temperature conditions during the vacuum brazing process. By monitoring the changes of magnesium in the furnace, the melting state of the brazing filler metal can be confirmed, thereby achieving the purpose of precisely controlling the quality of vacuum brazing of aluminum alloys.

[0006] To achieve this objective, the technical solution adopted by the present invention is as follows:

[0007] A method for precise control of vacuum brazing of aluminum alloys is disclosed, wherein a magnesium element detection instrument is installed inside the vacuum brazing furnace. The monitoring position can be around the furnace body or close to the part. By monitoring the change of magnesium element in the vacuum brazing furnace, the melting state of the brazing filler metal in the vacuum brazing furnace can be confirmed, so as to control the fluidity of the brazing filler metal. This method is particularly suitable for brazing narrow air / water channels inside parts to prevent blockage of internal channels caused by improper temperature control and holding time.

[0008] The magnesium content detector is centrally linked to the vacuum brazing furnace, enabling automatic control of the furnace's heating time, holding time, and power on / off.

[0009] Vacuum brazing furnaces determine the welding status by monitoring magnesium content data.

[0010] A method for precisely controlling vacuum brazing of aluminum alloys includes the following steps:

[0011] Step 1: Chemically clean the aluminum alloy material and brazing filler metal to be welded;

[0012] Step 2: Assemble all the parts to be welded and the brazing filler metal, and use tooling to press them together to confirm that the assembly meets the process requirements;

[0013] Step 3: Clean and confirm that the magnesium element probe / sensor connector is clean and free of stains;

[0014] Step 4: Place the parts to be welded in the vacuum brazing furnace and fix the magnesium element probe or sensor.

[0015] Step 5: Close the furnace door and begin vacuuming and heating;

[0016] Step 6: Once the magnesium element probe or sensor measures the amount of volatile magnesium in the furnace to the set value, start heat preservation for 2-30 minutes and then turn off the power;

[0017] Step 7: The parts are cooled in the furnace and welding is completed;

[0018] Step 8: Remove the components and clean the magnesium element probe or sensor.

[0019] Step 9: After the components have cooled to room temperature, inspect the weld quality.

[0020] The beneficial effects of this invention are:

[0021] This invention proposes a method for precise control of vacuum brazing of aluminum alloys, compared with the traditional method of monitoring aluminum alloy brazing by setting furnace temperature profiles. This invention provides more precise control and monitoring of the melting state of the brazing filler metal, thereby achieving precision welding of parts with narrow internal flow channels. The welding process is stable, the weld joint is completely fused, and the internal flow channels are unblocked, greatly improving the welding success rate. Furthermore, centralized control enables automated batch welding of multiple product types. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of the invention. Figure 1 .

[0023] Figure 2 This is a schematic diagram of an embodiment of the invention. Figure 2 . Detailed Implementation

[0024] Combined with appendix Figure 1-2The invention will be further described in detail below with reference to the accompanying drawings.

[0025] A method for precise control of vacuum brazing of aluminum alloys is disclosed, wherein a magnesium element detection instrument is installed inside the vacuum brazing furnace. The monitoring position can be around the furnace body or close to the part. By monitoring the change of magnesium element in the vacuum brazing furnace, the melting state of the brazing filler metal in the vacuum brazing furnace can be confirmed, so as to control the fluidity of the brazing filler metal. This method is particularly suitable for brazing narrow air / water channels inside parts to prevent blockage of internal channels caused by improper temperature control and holding time.

[0026] The magnesium content detector is centrally linked to the vacuum brazing furnace, enabling automatic control of the furnace's heating time, holding time, and power on / off.

[0027] Vacuum brazing furnaces determine the welding status by monitoring magnesium content data.

[0028] A method for precisely controlling vacuum brazing of aluminum alloys includes the following steps:

[0029] Step 1: Chemically clean the aluminum alloy material and brazing filler metal to be welded;

[0030] Step 2: Assemble all the parts to be welded and the brazing filler metal, and use tooling to press them together to confirm that the assembly meets the process requirements;

[0031] Step 3: Clean and confirm that the magnesium element probe / sensor connector is clean and free of stains;

[0032] Step 4: Place the parts to be welded in the vacuum brazing furnace and fix the magnesium element probe or sensor.

[0033] Step 5: Close the furnace door and begin vacuuming and heating;

[0034] Step 6: Once the magnesium element probe or sensor measures the amount of volatile magnesium in the furnace to the set value, start heat preservation for 2-30 minutes and then turn off the power;

[0035] Step 7: The parts are cooled in the furnace and welding is completed;

[0036] Step 8: Remove the components and clean the magnesium element probe or sensor.

[0037] Step 9: After the components have cooled to room temperature, inspect the weld quality.

[0038] Based on the characteristics of magnesium in brazing filler metal and aluminum substrate being active and easily volatilized at high temperatures, this invention allows for direct monitoring of magnesium changes and content within the furnace using a magnesium element detection instrument. This enables the determination of the melting state of the brazing filler metal, thereby achieving precise control of the melting time and holding time. This facilitates precise welding of narrow-space channels and prevents overflow from clogging the channels.

Claims

1. A method for precisely controlling vacuum brazing of aluminum alloys, characterized in that: A magnesium element detection instrument is installed inside the vacuum brazing furnace. The monitoring position is around the furnace body or close to the part. By monitoring the change of magnesium element in the vacuum brazing furnace, the melting state of the brazing filler metal in the vacuum brazing furnace can be confirmed, so as to control the flowability of the brazing filler metal. This is used for brazing narrow air / water channels inside the parts to prevent the blockage of internal channels caused by improper temperature control and holding time.

2. The method for precision-controlled vacuum brazing of aluminum alloys according to claim 1, characterized in that: The magnesium element detection instrument is centrally linked to the vacuum brazing furnace to automatically control the heating time of the vacuum brazing furnace, as well as the holding time and power supply.

3. The method for precise control of vacuum brazing of aluminum alloys according to claim 1, characterized in that: Vacuum brazing furnaces determine the welding status by monitoring magnesium content data.

4. The method for precise control of vacuum brazing of aluminum alloys according to claim 1, characterized in that: Includes the following steps: Step 1: Chemically clean the aluminum alloy material and brazing filler metal to be welded; Step 2: Assemble all the parts to be welded and the brazing filler metal, and use tooling to press them together to confirm that the assembly meets the process requirements; Step 3: Clean and confirm that the magnesium element probe is clean and free of stains; Step 4: Place the parts to be welded in the vacuum brazing furnace and fix the magnesium element probe; Step 5: Close the furnace door and begin vacuuming and heating; Step 6: Once the magnesium probe measures the amount of volatile magnesium in the furnace to the set value, start heat preservation for 2-30 minutes and then turn off the power; Step 7: The parts are cooled in the furnace and welding is completed; Step 8: Remove the components and clean the magnesium probe; Step 9: After the components have cooled to room temperature, inspect the weld quality.

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