Types Of Welds|Weld Types

Different types of welds are used to get different welding joints .The different types of weld are Bead weld, Groove or butt weld, Fillet weld, Plug or slot weld.

Contents

Types of welds

Bead weld
Groove or butt weld
Fillet weld
Plug or slot weld

Bead weld

Bead weld is a type of weld composed of one or more stringer or weave beads deposited on an unbroken surface to obtain the desired properties and dimensions.

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Butt weld or groove weld

Butt weld or groove weld is a weld made in the groove between two members to be joined as butt joint.

Groove welds are also done on T fillet joints if the plate thickness is more than 12mm.

Fillet welds

Fillet weld is a weld, having a triangular cross-section, joining two surfaces at right
angle to each other such as:

Lap joint
Tee joint
Corner joint

a) Butt joint. In this joint type, the parts lie in the same plane and are joined at their edges.
b) Corner joint. The parts in a corner joint form a right angle and are joined at the corner of the angle.
c) Lap joint. This joint consists of two overlapping parts.
d) Tee joint. In a tee joint, one part is perpendicular to the other in the approximate shape of the letter ‘‘T.’’
e) Edge joint. The parts in an edge joint are parallel with at least one of their edges

Plug welds and slot welds

Plug or slot welds are welds used to join two over-lapping pieces of metal by welding
through circular holes or slots.

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These welds are often used in the place of rivets.

a Plug welds and slot welds are used for attaching flat plates, as shown in Figure below, using one or more holes or slots in the top part and then filling with filler metal to fuse the two parts together.

Plug welds are placed in around holes and slots welds are place in elongated holes. In each case, the weld meatal is place in the hole up to a certain depth (partial penetration or full
penetration).

The penetration depth of plug or slot weld is difficult to inspect visually, so such welds are not often preferred

Plug and slot welds are used to:
1- Transmit shear in lap joint
2- Connect components of built up members (such as web doubter plates) to prevent
buckling.
3- To conceal connection for steel that are exposed to architectural reason
4- To add strength to connection with fillet welds
5- Neither plug nor slot welds should be used where tension force is normal to the
plane pf the faying surface
6- Nor should they be used to support cyclical loads

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