A vacuum brazing furnace is a high-precision thermal processing system that joins metal components in a highly controlled vacuum environment. It eliminates oxidation and contamination, producing strong, clean, and repeatable brazed joints. Vacuum brazing is widely used in industries like aerospace, automotive, tooling, and heat exchanger manufacturing.
What Is a Vacuum Brazing Furnace?
A vacuum brazing furnace heats assemblies in a vacuum chamber to a temperature above the brazing filler metal’s melting point, but below the base materials’ melting point, allowing the filler to flow into joints by capillary action. This process creates a strong metallurgical bond without oxidation or flux.
How Vacuum Brazing Works
The typical vacuum brazing process includes:
- Preparation: Clean and assemble parts to remove oils, oxides and contaminants.
- Vacuum Evacuation: Air and gases are pumped out to reach the required vacuum level.
- Heating: The furnace heats the assembly uniformly to brazing temperature.
- Brazing: Filler metal melts and flows into joint clearances by capillary action.
- Cooling: Controlled cooling under vacuum preserves joint integrity.
Advantages of Vacuum Brazing Furnaces
Compared with conventional brazing, vacuum brazing provides:
- Oxidation-free, clean joints without discoloration or scaling
- High repeatability and joint integrity
- Minimal distortion of components
- Ability to join dissimilar and precision parts
- Reduced need for post-brazing cleaning
- Environmentally friendly and energy-efficient
Industrial Applications
Vacuum brazing furnaces are commonly applied in:
- Aerospace components and assemblies
- Automotive heat exchangers and complex assemblies
- Cutting tools such as CBN, PCD brazed tools
- Stainless steel and copper alloy parts
- Heat exchanger cores and precision joints
The flexibility of vacuum brazing allows large assemblies or batches to be brazed simultaneously with high precision and repeatability.
The following video presents the exterior structure and chamber configuration of a vacuum brazing furnace, illustrating its industrial design and system layout.
Vacuum brazing furnace exterior and chamber structure overview.
Types & Models Offered
Brother Vacuum Brazing Furnaces can reach up to 1350℃ normally, 1500℃ Max. with vacuum chambers suitable for many brazing applications, including stainless steel, tool steels, copper alloys, and diamond-based tools.
Our furnaces feature PLC programmable temperature control, high vacuum capability, and customizable chamber sizes, ensuring reliable results for both small and large brazed components.
FAQ – Vacuum Brazing Furnace
What metals can be brazed in a vacuum brazing furnace?
Metals such as stainless steel, copper, nickel alloys, tool steels, and some carbide tools can be vacuum brazed with appropriate filler metals.
Why choose vacuum brazing over traditional brazing?
Vacuum brazing prevents oxidation, improves joint cleanliness, and reduces post-processing, making it ideal for high-precision and high-reliability assemblies.
Can vacuum brazing handle complex shapes?
Yes. The controlled environment allows complex and dissimilar parts to be joined with high integrity and minimal distortion.
Contact Us for Customized Solutions
If your application requires specialized vacuum brazing solutions or consulting on furnace configuration, contact our engineering team for customized support.
Technical Specifications
| Working Temp. | 750℃ (Alloy tube heaters) |
| 1100℃ (Heating wires) | |
| 1350℃ (Molybdenum strap heaters ) | |
| 1500℃ (Customizable) | |
| Furnace chamber | 750℃ (Stainless steel sheets) |
| 1100℃ (Ceramic fiberboard) | |
| 1350℃ (Molybdenum sheets and Stainless steel sheets ) | |
| 1500℃ (Customizable） | |
| Furnace Structure | Double layers Carbon steel casing with water cooling system to ensure the surface is below 30℃ |
| The furnace door inside is polished stainless steel | |
| Working Voltage | 380V 50HZ 3P (or according to your standard) |
| Max. Power | 3KW–180KW |
| Temperature control system | |
| Temperature Control | 50 segments programmable and PID auto control or PLC |
| Upper limited alarm and deviation alarm | |
| Temperature Accuracy | +/- 1℃ |
| Heating Rate | ＜ 20℃/min |
| Temperature Alarm | Over-temperature alarm |
| Broken thermal-couple alarm | |
| Thermocouple | K / S type |
| Touch Screen | 10 inches LED touch screen |
| Over 30 working programs can be set | |
| Heating curves can be saved | |
| Vacuum system | |
| Maximum Vacuum | 7×10-4Pa |
| Working Vacuum | 7×10-3Pa with Mechanical pump and Diffusion pump |
Standard Size: (other sizes can be customized)
Stainless steel chamber up to 750℃
| Model | Chamber size | Max Temp. | Power | Voltage | Max. vacuum |
| BR-QHS-223 | 200*200*300mm | 750℃ | 12kW | 380V | 7×10-3 Pa (7×10-5 mbar) |
| BR-QHS-334 | 300*300*400mm | 750℃ | 21kW | 380V | |
| BR-QHS-446 | 400*400*600mm | 750℃ | 34kW | 380V | |
| BR-QHS-557 | 500*500*700mm | 750℃ | 46kW | 380V | |
| BR-QHS-669 | 600*600*900mm | 750℃ | 64kW | 380V |
Ceramic fiber chamber up to 1200℃
| Model | Chamber size | Max Temp. | Power | Voltage | Max. vacuum |
| BR-200BF | Dia200*400mm | 1200℃ | 8 | 380V | 7×10-3 Pa(7×10-5 mbar) |
Molybdenum chamber up to 1350℃
| Model | Chamber size | Max Temp. | Power | Voltage | Max. vacuum |
| BR-QHM-223 | 200*200*300mm | 1350℃ | 34kW | 380V | 7×10-3 Pa (7×10-5 mbar) |
| BR-QHM-334 | 300*300*400mm | 1350℃ | 60kW | 380V | |
| BR-QHM-446 | 400*400*600mm | 1350℃ | 98kW | 380V | |
| BR-QHM-557 | 500*500*700mm | 1350℃ | 132kW | 380V | |
| BR-QHM-669 | 600*600*900mm | 1350℃ | 180kW | 380V |
If you need Max. Temp. 1500℃ Vacuum Brazing Furnace, please contact us for more details.
Vacuum Brazing for Aluminum Components
Vacuum brazing of aluminum requires precise temperature control and a clean, oxygen-free environment due to aluminum’s low melting point and oxide sensitivity.
For applications involving aluminum components and heat exchangers, a dedicated vacuum aluminum brazing furnace is typically used to ensure stable brazing quality and repeatable results.
Vacuum Brazing Tips for High-Quality Brazed Joints
Achieving high-quality brazed joints in a vacuum brazing furnace depends on proper material preparation, joint design, and precise process control.
To learn more about key factors such as surface cleanliness, joint clearance, heating uniformity, and cooling control, see our detailed guide: Vacuum Brazing: How to Achieve High-Quality Brazed Joints
