Induction Brazing Systems

Your Partner for Induction Brazing & Soldering

Induction brazing is a process of joining materials together using induction. An induction coil quickly transfers heat precisely to the joint, melting a compatible filler material through capillary action. Filler metals include lead, tin, copper, silver, nickel, and their alloys. Lead-tin soldering (soft soldering) is conducted below 840 degrees Fahrenheit. Silver brazing is conducted at temperatures from 840 to 1,600 F. Copper brazing is conducted at temperatures from 1,900 to approximately 2,000 F.

The success of these processes depends on chemical cleanliness, temperature control, and the clearance between the surfaces to be joined. Cleanliness is usually obtained by introducing a flux that cleans, dissolves, and floats off any dirt or oxides, however, fluxes should not be relied on as the primary cleaning agent in the process. Some filler metal and base metal combinations do not require the use of a chemical flux, such as when brazing copper base metals with a BCuP filler metal. The phosphorus contained in this filler metal family reacts with the copper base metals and reduces any oxides on the part. The flux also covers and protects the area by shielding it from oxidation during the process. It may, to some extent, reduce the surface tension of the molten metal to promote free flow. The worst contamination is usually due to oxidation during the brazing process. Many operations are conducted in a controlled atmosphere with a blanket of inert gas to shield the operation and eliminate the need for a flux. Temperature control, although influenced by fixture design, is dependent primarily on the heat application method.