1. Fluxes
Veerankutty
ME S4
NO: 56

2. Functions of Flux
Remove any oxides that form as a result of heating the parts
Promote wetting
Aid in capillary action

3. Flux in General
When heated to its reacting temperature must be thin and flow through the gap provided at the joint
As it flows through the joint it absorbs and dissolves oxides, allowing the molten filler metal to be pulled in behind it.
Once the joint is complete the flux material should be completely removable

4. Types of Fluxes Solids Powders Paste Liquids Sheets Rings Washers
They are also available mixed with filler metal, inside the filler metal or on the outside of filler metal

5. Fluxing Action
Will remove light surface oxides, promote wetting, and aid in capillary action
But they do not eliminate the need for good joint cleaning
Flux will not remove oil, dirt, paint, glue, heavy oxides or other surface contaminants

6. Soldering & Brazing Fluxes
Soldering Fluxes are chemical compounds such as
Muriatic acid (hydrochloric acid)
Sal ammoniac (ammonium chloride)
Rosin
Brazing Fluxes are chemical compounds such as
Fluorides
Chlorides
Boric acids
Alkalies

7. Thank you