Fluxes
Unfortunately, there is no universal flux that covers the entire temperature range from 600 ° C to 1000 ° C and that satisfies all the above requirements. Boron-based components which are completely satisfactory at the highest temperatures lack flowability and activity below 750 ° C and are therefore ineffective. To solve this problem, a series of compounds containing low melting fluorides have been developed, each of them with specific characteristics of use. The key features of our complete series of fluxes are described in the table below.
The residues of some fluxes disappear during cooling. Others must be eliminated by washing, mechanically or chemically.
Fluxes for silver soldering, for light metals, zinc and its alloys: brush in hot water and rinse (do not use wire brushes). The residues of Pastin 1-2 fluxes are removed with hot water, Pastin 3 with benzuene or thuluol.
Hammer, scraper, metal brushes, grinding wheel, cleaner, emery cloth, sandblasting, etc.
Here are some solutions that can generally be used depending on the base metal.
It is necessary to carry out a thorough cleaning of the faces of the joint to be brazed before brazing, in order to eliminate grease and foreign substances, but also to use a flux to obtain a good brazing.
A flux is a chemical compound based on potassium tetraborate or potassium fluoride, it comes in the form of a paste or powder. Its role is:
A flux must possess other qualities according to its composition:
The use of potassium components avoids the flare caused by sodium during torch brazing. However, fluxes must be used with caution and it is preferable to avoid contact with the skin for a long time and not to breathe the degassed vapours (fumes). Hence, the need to ventilate the workplace well.
Fluxes are selected based on:
Type / description | Interval | Fluidit | Activities | Life | Available in | |
---|---|---|---|---|---|---|
C | Dust | Pasta | ||||
N. 1 - FLUX 1 F | 530-750 | Very good | Very good | Media | And | And |
N. 2 - FLUX 1100 | 550-800 | Good | Good | Very long | And | And |
N. 3 - BLACK FLUX | 600-1000 | Good | Good | Very long | No | And |
N. 4 - DRY FLUX | 550-850 | Good | High | Very long | And | And |
N. 5 - FLUX 751 | 550-800 | Good | High | Media | No | And |
FLOW 707 | 180-350 | Good | High | Media | No | And |
The new fluxes 16/14, 16/17 and 16/18 for silver alloys replace the old formulation fluxes.
The flux series 16 comply with REACH - CE 1907/2006, Annex II - Rev. 16/01/2012 and do not require ADR transport.
Type | Description | Interval | Fluidit | Activities | Life | Available in | |
---|---|---|---|---|---|---|---|
C | Dust | Pasta | |||||
FLOW 16/14 | Universal. For metals, copper and its alloys, iron, stainless steel. | 530-750 | Very good | Very high | Media | And | And |
FLOW 16/17 | Universal. For strong thicknesses, stainless steel, tungsten carbides. | 600-1000 | Good | Good | Very long | And | And |
FLUX 16/18 IND. | Universal. Induction brazing on heavy metals. | 550-850 | Good | High | Very long | And | And |
For information on fluxes, fill out the form and ask for a quote