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Welding history

Classification of welding

Effect of welding speed

Welding defects

Types of welding joints

Welding position

Welding electrodes

Types of welding flame

Welding flux

Welding techniques

Welding symbol

Welding edge preparation

Advantages of welding joints

Thermal properties of metal

Welding safety

Types of welds

Brazing

Soldering

Welding joints

Weld joints and symbols

Weld symbol is indicated the type of weld joint. Weld joints are classified according to the method of joining as butt joint, lap joint, strapped joint, tee joint and corner joints.


In butt joint, the two plates to be welded are placed in the same plane face to face before welding.


In fillet welding joint the two plates to be welded are place in contact each other in different planes.


The forms and dimensions of the edge preparation depends on the thickness of

the plates to be joined. No  edge preparation is required for the plate thickness up-to 5mm, whereas single ‘V’ can be employed to the plate thickness up-to 20mm and double ‘V’ can be provided where plate thickness is more than 20mm.

Welding joints and their symbols

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Weld joints and symbols