Soldering And Welding Important Notes
1. Soldering And Welding Soldering
It is a process of joining metals by the use of a filler metal that has a lower fusion temperature than that of the metals being joined.
Soldering Types:
- Investment soldering
- Freehand soldering
2. Soldering And Welding Welding
Involves the joining of two metals without introducing a third metal
3. Soldering And Welding Flux and antireflux
- Flux – means flow
- Important for good solder joint
Flux and antireflux Uses:
- Removal of oxide coating of solder
- Dissolves impurities
- Prevents oxidation
- Reduces melting point
Flux and antireflux Composition:
- Borax glass – 55%
- Boric acid – 35%
- Silica -10%
- Antiflux – Confines flow of molten solder
- Example. Lead pencil markings
- Graphite lines
- Iron rouge
Soldering And Welding Short Essays
Question 1. Soldering and Welding.
Answer:
Soldering – It is a process of joining metals by the use of a filler metal that has a lower fusion temperature than that of the metals being joined.
Soldering and Welding Types:
1. Investment soldering:
- Indication – Presence of large contact area between metals
- In need of precision
- Procedure – By embedding metals in investment
2. Freehand soldering:
- Indication – Common orthodontic procedures
- Procedures – Soldering by holding metals precisely
Soldering and Welding Steps:
- Clean the surfaces
- Assemble the parts Select the proper solder and flux
- Select proper joint
- Flux application
Read And Learn More: Dental Materials Question and Answers
- Application of solder
- Quenching
- Welding – involves the joining of two metals without introducing a third metal
- Procedure:
-
- Selection of electrode
- Placement of metals between 2 electrodes
- Maintain pressure on it
- Switch on electrode
- Keep it for sometime
Soldering And Welding Short Question And Answers
Question 1. Soldering flux.
Answer:
Soldering flux
- Flux – means flow
- Important for good solder joint
Soldering flux Uses:
- Removal of oxide coating of solder
- Dissolves impurities
- Prevents oxidation
- Reduces melting point
Soldering flux Composition:
- Borax glass – 55%
- Boric acid-35%
- Silica -10%
Question 2. Requirements of dental solder.
Answer:
Requirements of dental solder
- It should melt at a temperature below the solidus temperature of the parent metal
- When melted it should be wet and flow freely over the parent metal
- Its color should match that of the metal being joined
- It should be resistant to tarnish and corrosion
- It should resist pitting during heating and application