Brazing

Brazing

A metal-joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint, the filler metal having a lower melting point than the adjoining metal
vacuum furnace brazing of stainless steel parts in a graphite lined cold wall vacuum furnace

Furnace Vacuum  
Brazing 

  • Vacuum Furnace Brazing is the most cost-effective method for joining precision components in corrosion and heat resisting materials. 
  • It is the preferred method for producing high integrity joints in stainless steels and nickel-based alloys using predominantly nickel based filler materials.
  • Brazing is carried out in a vacuum of around 10-4 mbar and without flux. 
  • Assemblies come out of the furnace clean and without discoloration and distortion.
  • The absence of flux means that the joint is completely filled without voids, ensuring joints of very high integrity.
Induction vacuum brazing of a steel aerospace component filler material can be seen in the part before melting

Induction Vacuum Brazing

  • Induction brazing in vacuum produces joints equal in integrity to that of vacuum furnace brazing. 
  • Heat is localised to the joint area which means that the process does not anneal the whole assembly. This is useful where it is desirable to retain as far as is possible the wrought properties of the parent materials. 
  • The brazement can be observed throughout the thermal cycle so very close control of the process is possible.
  • This technique is particularly suited to long tubular/rod assemblies that will not fit into a vacuum furnace and where it is desirable to retain the wrought properties of the tube/rod component.
  • Materials that can be joined by this technique are stainless steels, nickel alloys, titanium alloys and non-metallics such as alumina and diamond.
Share by: