NOCOLOK technology

FROST Ltd. produces brazed aluminum heat exchangers according to NOCOLOK technology.
Brazing of heat exchangers is performed on the line in a controlled nitrogen atmosphere. Brazing line capacity: 700,000 heat exchangers per year.

This process involves joining components with:

Solder alloy (which is an Al/Si alloy)
Which has a lower melting point than the components.
Using a non-corrosive flux.

The solder alloy is placed next to or between the components, heated to a temperature above the melting point of the solder alloy but lower than the components.
On cooling, the alloy forms a metallic bond between the surfaces of the components.