Vacuum Aluminum Brazing Furnace

It is widely used in aluminum brazing products such as aluminum plate-fin heat exchangers, automobile radiators, automobile air conditioner evaporators, condensers, radar network antennas and waveguides. Widely used in automotive, electronics, national defense, aerospace, aviation fields.

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Product Introduction

What is Vacuum Aluminum Brazing Furnace?

These furnaces have complete metal insulation with a low degassing rate, full-size pumping units to ensure the high vacuum level required for aluminium brazing and 6 heating zones to guarantee a thermal homogeneity of +/-3°C.

The vacuum furnaces are particularly well suited for the brazing of heat exchangers (honeycombs, plates, exchanges, etc.), sub-units for aeronautics and aerospace engineering (waveguides, etc.).

Equipment Working Conditions:

1. Power conditions: three-phase 380V (±6%); 50Hz.

2. Cooling water requirements: inlet pressure 0.1～0.2MPa; temperature ≤30℃; PH value is about 7; water quality is soft water without sediment and impurities; flow rate 40T/h.

3. Environmental conditions: Ambient temperature: higher than 0°C~35°C; ambient relative humidity ≤95% (25°C); altitude below 1000m;

4. Compressed air (power air source): pressure 0.4～0.6MPa.

5. Installation method: ground installation.

Main data parameters of vacuum aluminum brazing furnace
Model	Average temperature zone size	Maximum temperature	Ultimate pressure	Pressure rise rate	Temperature uniformity
RVSL-459	450×450×900	850	8.0×10-4	0.5	±3
RVSL-669	600×600×900	850	8.0×10-4	0.5	±3
RVSL-6612	600×600×1100	850	8.0×10-4	0.5	±3
RVSL-8716	800×700×1600	850	8.0×10-4	0.5	±3
RVSL-7112	700×1000×1200	850	8.0×10-4	0.5	±3
RVSL-7114	700×1000×1400	850	8.0×10-4	0.5	±3
RVSL-1325	1300×1100×2500	850	8.0×10-4	0.5	±3

Features of Vacuum Aluminum Brazing Furnace

It offers advantages such as no pollution, no flux, no pores, slag inclusion, and energy saving, making it an ideal equipment to replace salt bath brazing. It features multi-zone temperature control and good temperature uniformity.

The unique anti-deformation structure of the heating body ensures a long service life.

A trap is installed at the inlet of the vacuum system to prevent contamination of the vacuum system by welding.

Types of Vacuum Aluminum Brazing Furnaces

Typical vacuum aluminum brazing furnaces are either singlechamber (batch type) or multiple-chamber (semi-continuous). Batch type furnaces are usually loaded horizontally, but can be designed for a vertical loading operation. Semi-continuous furnaces are horizontally loaded and are typically automated using load carriers and external conveyor systems.

Batch furnaces tend to be simpler in design (one loading/unloading door) than semi-continuous furnaces, less expensive, and easier to maintain. Semi-continuous furnaces have higher production rates because of the multi-chamber design and operate more efficiently by not having to cool heating zones or heat cooling zones.

Benefits of Vacuum Aluminum Brazing Furnace

Good Welding Quality

Brazing the aluminum heat exchanger in a vacuum environment ensures that the aluminum material does not produce an oxide film during the welding process. The welding points at the welding site are full and firm.

Fully Automatic Control

Workers only need to place the aluminum heat exchanger into the chamber of the aluminum vacuum furnace, close the furnace door, and the equipment will automatically run according to the set brazing program, without the need for workers to supervise the entire process.

Reduce Environmental Pollution

The entire brazing process produces minimal smoke and dust, and the gas extracted by the vacuum pump passes through an air filter before being discharged into the atmosphere, ensuring no pollution.

Dedicated Forklift

This vacuum aluminum brazing furnace comes equipped with a dedicated forklift, allowing workers to quickly load and remove the aluminum heat exchanger from the furnace.

Widely Applicable

Suitable for welding various aluminum and its alloy materials, this furnace is applicable across industries such as aerospace, automotive manufacturing, and electronic components.

Good Insulation

The entire vacuum aluminum brazing furnace body features a cooling water circulation device. During high-temperature brazing, the surface temperature of the furnace body will not exceed room temperature, providing a comfortable working environment.

Applications Industries

Heating, ventilation, air conditioning and refrigeration (HVAC&R)
Automotive

Aviation
Railway

Electronics and home appliances
Manufacturers of power generators and power plants

Components of Vacuum Aluminum Brazing Furnace

Stainless steel hot zone insulation and Nichrome heating elements
Multi-sided heating zones for precise temperature control
Specialized hot water chamber re-circulating system, set at 140 °F (60 °C), to prevent magnesium build-up on the cold walls
Larger pumping system designed to handle magnesium burst during the brazing process (poor vacuum = poor braze quality)
Vacuum gauge filter vapor traps
Multi zone proportional integral derivative (PID) control loop design to adjust to different part sizes and weights
Shielding for prevention of magnesium build up on door O-ring and main valve poppet ring
Double door for ease of maintenance.

The heating element ceramic insulator design and spacing is also different on a vacuum aluminum brazing furnace, which allows it to run for longer periods of time before replacement is needed.

Accessories

Dry Screw pumping systems
Stainless steel inner chamber walls
Cryogenic panels and pumping systems
Outer Loop Cooling System (Open or Closed)
Installation Services
Magnesium traps and condenser panels
Load tray and carriers
Manual and automated load handling systems
Process heating cycle optimisation features
Internal forced gas cooling systems
External air blast cooling systems

Industry-leading Brazing Solutions

Vacuum furnace brazing is a metal joining process that takes place in a chamber known as a vacuum furnace at well below atmospheric pressure. This joining technique offers significant advantages including durable, clean, flux-free braze joints of high structural integrity.

This brazing process is what enables signal cleanliness for microwave applications. The clean and controlled brazing process ensures the precision machined waveguide channels remain clear while providing a complete bond enclosing the waveguide channels. These two results of the brazing process produce high-performance waveguide assemblies with improved clarity and reduced signal loss.

Similarly, the vacuum brazing process provides a high strength joint between a liquid cavity and a cover which form internal fluid passageways. These passages are critical to high-performance liquid cooling. The vacuum brazing process empowers the engineering team to design an effective heat transfer pathway to remove heat from high power electronics chips, boards, and assemblies. Once brazed, the liquid channels can withstand high pressures to ensure a reliable hermetic seal within the liquid cooling system.

We have a wide variety of brazing capabilities that can support the brazing of aluminum and high temperature alloys:

Carbon steel, stainless steel, copper, aluminum, and ceramic are all applicable materials for using the vacuum furnace brazing technique.
Applicable standards specified by the AWS C3.7 Brazing Specification and AMS 2750 Pyrometry Specification for aluminum brazing.
Applicable standards specified by the AWS C3.6 Brazing Specification and AMS 2750 Pyrometry Specification for steels, stainless steels, copper, nickel, etc.

Tips for the Best Cleaning Cycle Before Brazing

The cutting oil residue (used for the production of plates, turbulators, separator elements, etc.) hinders the maintenance of ideal brazing conditions as the oil evaporated from the parts contaminates the furnace and diffusion pumps. This creates an obstacle to continuous brazing and therefore results in defects. Before loading the heat exchanger components into the furnace for vacuum brazing, you can the following cleaning cycle:

Plated components (4004, etc.)

Steam at 80° c

Ultrasound cleaning

Drying

Not plated components

Steam degreasing

Acid or alkaline solution

Rinsing in water

Nitric acid bath

Rinsing in water

Drying

Vacuum Aluminum Brazing Furnace Manufacturer – Shenyang Hengjin Machinery:

Shenyang Hengjin Machinery has engaged in Vacuum Heat Treatment Furnace research and manufacturing. We have received a lot of good feedback about the Vacuum Aluminum Brazing Furnace from our customers. It plays an sequential treatment of a large number of parts or materials without interruption. In addition to the Vacuum Aluminum Brazing Furnace, we provide vacuum brazing oven, vacuum aluminum brazing furnace, vacuum sintering furnace, Vacuum Heat Treatment Process, high temperature vacuum furnace, Vacuum continuous furnace,and so on. Please leave your requirement.

FAQ

Q: 1. What is the difference between aluminum dip brazing and aluminum vacuum brazing?

A: Aluminum Dip Brazing: Aluminum dip brazing involves placing brazing sheets in molten salt to break down metal oxides. The filler metal is initially positioned outside of the joint and heated to molten temperature before it enters it. As it travels through the joint, the filler metal expels the flux from it. Unlike aluminum vacuum brazing, this procedure does not apply pressure to a joint. As a result, it can be used on parts without large flat surfaces or similarly sensitive materials. Alloys subjected to aluminum dip brazing offer greater strength and an increased resistance to corrosion. Since they conduct heat effectively, they are also particularly useful for heat transfer applications.
Aluminum Vacuum Brazing: Aluminum vacuum brazing uses a clean vacuum environment without a flux. Because it applies pressure to the parts to be joined, it can only be used for flat, horizontal surfaces. In contrast, this process is designed for parts that are not flat. During aluminum vacuum brazing, pressure is applied to a metal part to break down its oxide layer. The filler metal is then diffused into the base metal. Because the filler metal is inserted into the joint before brazing begins, the process results in a cleaner and more precise joint. Aluminum vacuum brazing can be performed on metals with objects and cross-sections with different dimensions, making it a particularly versatile solution. Because it offers greater precision than dip brazing, it's best suited to any application that requires strict consistency.

Q: 2. What is the structure of a vacuum brazing furnace?

A: A vacuum brazing furnace consists of a heating chamber, vacuum chamber, pump system, control system, and heat exchanger. The pump system includes a maintenance pump, mechanical pump, diffuser pump, and Lutz pump. The valve system comprises high valves, front valves, maintenance pump valves, and bypass valves, among others. The heating chamber consists of a heating chamber shell, heater, reflective screen, insulating piece, hearth, and electrodes.

Q: 3. What is vacuum brazing furnace?

A: Furnace brazing is a semi-automated process by which metal components are joined using a dissimilar lower filler metal. Furnace brazing allows design and manufacturing engineers to join simple or complex designs of one joint or multi-joint assemblies.

Q: 4. What is aluminum vacuum brazing?

A: During aluminum vacuum brazing, pressure is applied to a metal part to break down its oxide layer. The filler metal is then diffused into the base metal. Because the filler metal is inserted into the joint before brazing begins, the process results in a cleaner and more precise joint.

Q: 5. What is the difference between vacuum brazing and brazing?

A: Brazing alloys can be utilized in the form of wires, foils or powders/pastes. The melting of the base material further leads to a considerably greater distortion during welding than during brazing. Since the vacuum brazing process is carried out in a furnace with uniform heating, the distortion is especially low.

Q: 6. What are vacuum furnaces used for?

A: Vacuum furnaces are used to carry out processes such as annealing, brazing, sintering and heat treatment with high consistency and low contamination. Characteristics of a vacuum furnace are: Uniform temperatures in the range. 800–3,000 °C (1,500–5,400 °F).

Q: 7. What is vacuum furnaces and how does it work?

A: It operates by heating materials in an environment where the air has been removed, creating a vacuum. This unique setup offers several advantages for various heat treatment and material processing applications.

Q: 8. What is the temperature of a vacuum brazing furnace?

A: Vacuum brazing is usually a high temperature (typically 1700°F/927°C - 2250°F/1232°C), fluxless process using nickel-base, pure copper and less frequently precious BFM. There are several advantages to brazing under vacuum conditions: The purity level of the atmosphere (vacuum) can be precisely controlled.

Q: 9. Can you vacuum braze aluminum?

A: Vacuum Aluminum Brazing is the go-to process for joining aluminum components that cannot tolerate the risk of flux or salt bath corrosion inherent to other brazing methods, and for designs that cannot tolerate the stress and distortion of welding or requires a joint configuration welding is incapable of achieving.

Q: 10. What materials are used in vacuum brazing?

A: The vacuum technology allows to braze a wide range of materials, from single structural steels to high-alloy cold and hot work steels, to super alloys, as well as non-ferrous metals such as copper and titanium and even ceramics, hard metals, and the cutting materials cBN and diamonds.

Q: 11. What are the methods of aluminum brazing?

A: The most important brazing method for aluminium is furnace brazing (in particular for the production of heat exchangers). But the traditional aluminium brazing techniques like dip (flux) brazing and manual flame (torch) brazing still find their specific applications.

Q: 12. What are three types of brazing?

A: There are four main types of brazing heating methods: torch or manual brazing, induction brazing, resistance brazing, and vacuum brazing.

Q: 13. What is the introduction of vacuum brazing?

A: Brazing is a method of joining two or more metals by melting a filler metal, or the brazing alloy. When alloys are used instead of a pure metal for the process in a vacuum furnace, they do not contain fluxes, there is therefore no need to remove the slag by mechanical methods and the weld appears clean.

Q: 14. What is the difference between welding and brazing Aluminium?

A: Aluminum brazing is not as strong as welding. In brazing, the two pieces to be joined are never melted. They are heated only enough to allow the brazing alloy to "wet" the surface, that is too flow freely into the area to be joined.

Q: 15. What is the vacuum level of a vacuum furnace?

A: The base vacuum furnace comes standard with an evacuation system for vacuum levels down to 10-2 Torr (mbar), and an inert gas system for operation in Argon. An optional blower on the roughing pump brings down the operational pressure to 10-3 Torr (mbar).

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