Soldering And Welding In Dentistry

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

Read And Learn More: Dental Materials Question and Answers

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
  • 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 In Dentistry

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

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