Welding & Different Types of Welded Joints

The welding is a process of joining two similar or dissimilar metals by fusion, with or without the application of pressure and with or without the use of filler metal. The welding is broadly divided into the following two groups:

1. Forge or pressure welding (under pressure without additional filler metal)
2. Fusion or non-pressure welding (with additional filler metal)

Forge or Pressure Welding

Fusion or Non-pressure Welding

Types of Welded Joints

The commonly used joints in fusion welding are lap joint, butt joint, corner joint, edge joint and T-joint. The lap joints are employed on plates having thickness less than 3 mm. In butt welds, the plate edges do not require beveling if the thickness of plate is less than 5 mm. If the plate thickness is 5 mm to 12.5 mm, the edges should be beveled to V or U-groove and plates having thickness above 12.5mm should have a V or U-groove on both sides.

Different types of welding processes i.e. electric resistance welding and its types, arc welding, gas welding and oxygen cutting have been described in relevant sections of this website.

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