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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 edge preparation

Weld joint edge preparation

The edge preparation is very essential for making good quality welding joint. In this consists of cutting the edges of the places to be joint by welded in suitable shapes and proper cleanness must required. Which is free from dust, soil, oil, grease and other external harmful particle. According to the method of cutting the edges are face to face, single ‘V’, double ‘V’, single ‘U’, double ‘U’, single bevel, double bevel, single ‘J’, double ‘J’.


When face to face or plain face to be welded which is allow only up-to 5mm thickness of plate.

Joint


Particulars


Welding joint edge preparation

Plain face to face welding joint.


Square for maximum thickness up-to 5mm.

Single ‘V’ welding joint.

Single ‘V’ for sizes between 5mm to 20mm thickness.

Double ‘V’ welding joint.

Double ‘V’ edge for the minimum  thickness 12mm.

Single bevel welding joint.

Single bevel for sizes between 5mm to 20mm thickness.

Double bevel welding joint.

Double bevel for the minimum thickness of 12mm.

Single ‘U’ welding joint.

Single ‘U’ edge produced for the plate thickness between 8 mm to 37 mm.

Double ‘U’ welding joint.


Minimum 20mm. thickness plate should be produced double ‘U’ edge shape.

Single ‘J’ welding joint.


The single ‘J’ edge produced for the plate thickness between 8 mm to 37 mm.

Double ‘J’ welding joint.


For the double ‘J’ welding joint the minimum plate thickness should be 20 mm.

One side fillet welding.


Both side fillet welding.

‘K’ welding.

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Edge preparation