Brazing in a high vacuum environment provides the most process control and produces the cleanest parts, free of any oxidation or scaling. It is the preferred brazing environment for brazing aerospace components, hardening medical devices and other applications that require the absolute highest part quality.

We offer two machine designs for vacuum brazing – Bell Jar Vacuum Systems and Induction Heating Vacuum Furnaces.

Bell Jar Vacuum Systems for High Vacuum Direct Induction Heating

In a bell jar vacuum system, parts are directly heated in a fully enclosed chamber, which can be pumped down to 5×10-6 Torr. Special fixturing can be designed for automatic part loading and unloading, This type of system is often used for vacuum brazing steel or nickel alloys with steel.

With a bell jar system, the parts are positioned before the bell jar is lowered into place and the controlled atmosphere is created. In this environment, a high degree of control over the overall process can be achieved and open-air issues of oxidation, scaling and carbon buildup can be virtually eliminated.

  • Protective Atmosphere Heating With Easy Access To Parts & Fixturing
  • Vacuum Level To 5×10-6 Torr At Moderate Temperatures
  • Can Be Adapted For Automatic, High Volume Operation
  • Auto/Manual Control with Easy-To-Use Touch Screen
  • Optional Temperature Control
  • Direct Induction Heating of Joint Area

Our Bell Jar Vacuum Systems offer amazing flexibility and ease-of-use in a very cost-effective package. For maximum accessibility, the vacuum chamber lifts up and completely out of the way at the touch of a button. So it’s easy to load and unload parts, adjust tooling or change components.

These compact systems are designed for induction brazing, heat treating, melting and general purpose heating. The single chamber unit shown is designed for laboratory use, prototyping and low volume manufacturing. This unit can also be adapted for high volume, automatic operation with fixturing to move parts in and out of the chamber, and to adjust position as needed. Multiple chamber systems can be driven by a single power supply and vacuum system.

Induction Heating Vacuum Furnace for Brazing and Heat Treating 

An alternative method for vacuum brazing is to use an induction heating vacuum furnace, which is often the best choice for brazing parts of unusual shapes or “orphans” from other heating processes. The difference is that the induction furnace will heat the entire part rather than just a narrowly focused joint area. Quartz viewports can provide access for infrared temperature sensing of each individual part.

The use of induction heating eliminates the long heat cycle-time requirements of a conventional vacuum furnace. Through the use of induction, the necessary heat is produced quickly, efficiently and directly into a small graphite susceptor, which radiates the heat uniformly into the part.

  • Indirect Whole Part Heating
  • Typical Ultimate Vacuum of 5×10-6 Torr
  • Up to 90% Reduction in Overall Cycle Times
  • Can Be Adapted For Automatic, High Volume Operation
  • Auto/Manual Control with Easy-To-Use Touch Screen
  • Optional Temperature Control

Our compact, lean vacuum furnaces bring all the benefits of quick, clean induction heating technology to your manufacturing cell or laboratory. Ideal for brazing and heat treating processes that require high part quality and heating consistency, these induction furnaces heat parts of virtually any shape in a high temperature, high vacuum environment or in partial pressure of an inert gas.

GH IA Induction Vacuum Furnaces offer unique advantages that traditional resistance heating systems cannot match:

  • Up to 90% reduction in overall cycle times
  • Compact footprint fits your manufacturing cell
  • Low cost of ownership

GH IA Induction heating vacuum furnaces are AMS 2750 compliant for thermal processing equipment used in metal heat treating applications. Our furnaces are protected by US Patents 6,649,887 and 7724045. Other patents pending.

Standard or Customized

Our current standard model VF-35 Vacuum Furnace (shown at right) features a 12×16″ hot zone, and accepts parts weighing up to 60 lbs. The furnace requires just 15 minutes to reach 1900° F., and the maximum operating temperature is 3200° F.

GH IA will also custom design a vacuum furnace to match your process specifications. Contact us today at 585.368.2120 or email to info@gh-ia.com.

VF-35 Data Sheet | VF-35 Photo Gallery 

Full Process Control with Whole Part Heating

In our vacuum systems, parts are loaded into a steel chamber which is then pumped free of air and other gases before the heating process begins. Brazing or heat treating in a high vacuum environment offers a high degree of process control and produces exceptionally clean parts – free of oxidation and scaling.

In contrast to flame heating and resistance heating, a vacuum furnace heats the entire part and not just the joint area. With induction heating, it is possible to specifically design the current flow that is induced into the part or susceptor (hot zone), thereby precisely controlling the heat pattern and therefore the amount and area of heat. Cycle times are greatly reduced, and parts may be quickly processed individually or in small quantities as needed.

Reduced Cost of Ownership with Lean Technology

For manufacturers and lab managers who are searching for new ways to improve energy efficiency and reduce operating costs, our induction vacuum furnaces provide an excellent example of how lean, green technology can have a positive impact on the bottom line. When compared to a traditional large vacuum furnace system, VF Series Vacuum Furnaces can reduce overall all cost of ownership by as much as 75%. It’s easy to set up a continuous manufacturing flow, run various processes throughout the day and realize up to 90% improvement in overall cycle time.

Due to the heat source (typically radiation/convection) generally used for vacuum processing, heat cycle times have been the limiting factor in reducing process cycle time. Now, by integrating innovative induction heating with a small vacuum chamber, continuous-flow manufacturing can be realized.

The use of induction heating eliminates the long heat cycle-time requirements of a conventional vacuum furnace. Through the use of induction, the necessary heat is produced quickly, efficiently and directly into a small graphite susceptor, which radiates the heat uniformly into the part. To learn more, please read our Vacuum Furnace NPV Analysis.

Induction Vacuum Furnace applications

The most common applications for vacuum furnaces include heating small lot sizes, brazing parts of unusual shapes, repairing “orphans” from other heating processes, and other applications which benefit from whole part heating:

  • Active alloy brazing
  • Nickel brazing
  • Heat treating nickel alloys
  • Induction hardening
  • Aerospace component repair
  • Copper brazing of steel
  • Silver brazing of copper and brass
  • Material processing
  • Hardening of precision medical devices

LEARN MORE

Free Feasibility Test for Vacuum Brazing

GH IA offers a free parts evaluation service for vacuum brazing. Simply send us samples of your parts and tell us about your process – we’ll analyze your application requirements, determine the optimum combination of RF power, inductor configuration and atmosphere for your parts and give you our best advice!

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