Discuss functions of flux used to welding. Identify properties of material suitable for flux and state two materials used as flux.

Discuss functions of flux used to welding. Identify properties of material suitable for flux and state two materials used as flux.
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1 Answer

Answer :

Functions of flux

1. A flux is a material used for removal of oxides and other undesirable substances.

2. Flux is a material used to prevent dissolve or facilitate removal of oxide.

3. During welding, flux chemically reacts with the oxides and a slag is formed that floats to and covers the top of the molten puddle of metal and thus keep put atmospheric oxygen and other gases

Properties of flux: 

1. It has a low density

2. It can deoxidise the melt.

3. It can form a slag layer.

4. It can absorb gases.

5. It should not produce any harmful gases.

6. Melting point should be less.

Materials used for flux-

1. For welding aluminium and its alloy: - Flux may contain potassium chloride, lithium chloride etc.

2. For welding Copper and copper alloy:- Borax (fused), di-sodium phosphate, magnesium silicate, lime etc

3. For welding ferrous metal :- Mixture of borax, sodium carbonate and potassium bicarbonate; sodium carbonate and sodium bicarbonate; borax ,sodium carbonate and sodium nitrate or borax alone used as flux

4. For welding carbon steel:- Dehydrated borax and calcium oxide dissolved in liquid

5. For welding alloy steel:- Mixture of boric acid , Dehydrated borax and calcium fluorides
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