Welding Types and Definitions Notes

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Welding Definitions

Welding is a process of joining of two metals, same or different with the application of heat and with or without pressure and also with filler Rod or without filler rod.

The use of welding is extensive in today’s technological advancement. Welding is not used only in Mechanical Industries but in every branch of Science and Technology such as computer industries, Electronic Industries, petrochemical industries, etc.

Joining Process

On the basis of the composition of the Joint, the Joining Process are basically of three types-

  1. Homogeneous Process- In this type of Joining Process a Filler Rod (Electrode) is used and the two same metals are joined without the application of pressure.
  2. Heterogeneous Process– In this type of Joining Process Filler metal is soluble in both the parent metal which themselves are soluble in each other.
  3. Autogeneous Process– In this type of welding process no filler rod is used but the pressure applied is very high. Examples- Resistance Welding, Friction Welding, etc.

Types of Welding Process

The type of Welding Processes are kept under two categories-

  1. Pressure Welding
  2. Non-Pressure Welding

These two types of welding processes are further subdivided into these following categories-

Pressure Welding

  • Thermit Welding
  • Resistance Welding (Sub-divided)
  • Blacksmithy Welding (Sub-divided)
  • Solid-State Welding (Sub-divided)

Non-Pressure Welding

  • Gas Welding (Sub-divided)
  • Electric Arc Welding (Sub-divided)
  • Thermit Welding

Advantages of Welding

  • Welding joints are as strong as a base metal.
  • Many similar and dissimilar metals can be welded easily.
  • Welding is a permanent joint.

Limitations of Welding

  • A skilled Person is needed for welding purposes.
  • Special Jig and Fixtures are required
  • Distortion due to high temperature is possible in the Workpiece.

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