Soldering and Welding - Dental Materials

Soldering is a process of building up a localized area with a filler metal or joining two or more metal components by heating them to a temperature and filling the gap between them to a molten with a liquidus temperature below 450°C . While welding is a process of fusing two or more metals parts through the application of heat, pressure or both, with or without a filler metal, to produce a localized union across the interface between the parts

1. Soldering and Welding Dr.Shiva

2. SOLDERING Process of building up a localized area with a filler metal or joining two or more metal components by heating them to a temperature and filling the gap between them to a molten with a liquidus temperature below 450°C

3. SOLDERING

4. Brazing Process of building up a localized area with a filler metal or joining two or more metal components by heating them to a temperature and filling the gap between them to a molten with a liquidus temperature below 450

5. Ideal requirements of dental solder It should melt at low temperature It should match the metal being joined It should be Resistant to tarnish and corrosion It should be resistant to pitting during heating

6. Components of soldering Parent metal Flux Anti flux Solder/ filler metal

7. Investment soldering Free-hand soldering

8. Composition of gold solders

9. Composition of silver solders

10. FLUX “A flux is a material that is used to prevent oxidation, removes any preexisting oxide coat on the metal surface and allows free flow of solder”

11. Ideal Requirements of Flux Should be resistant to tarnish and corrosion. It should flow freely when it melts so that a layer of the solder should be formed over the parts united. It should be as strong as the parts joined. The fusion temperature of a solder should be less than that of the solidus temperature of the parent metals by at least 100°C. It should not cause pitting of the soldered joint. The solder should have a color that matches the color of the parts joined

12. Anti flux The material used to restrict the flow of solder are know as anti flux.

13. Welding Process of fusing two or more metals parts through the application of heat, pressure or both, with or without a filler metal, to produce a localized union across the interface between the parts

14. Welding

15. Laser welding Spot welding / resistance welding

16. Thank you