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Module 1: Weld Connections

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ntroduction to Weld Connection
 
Weld is basically a process of joining metal pieces by the application of heat, with or without pressure.
 
Types of welding process: 
 


Forge welding
Gas welding,
Electric-arc welding
Thermit welding
Resistance welding

There are basically three types of weld:

Fillet weld
Butt weld
Plug weld

Design of Butt Welds
A butt weld is used when the plates to be joined are in the same plane or when a T join is desired. The effective length of a butt weld should not be less than 4 times the size of the weld.
Reinforcement is the extra weld metal which makes the throat dimension at least 10% greater than the thickness of the weld material.
The design strength of butt weld in tension, compression, or shear is governed by yield. This design strength depends on the effective thickness of the weld.
Design of Plug and Slot Welds
Plug and slot weld is a type of fillet weld. They have a limited length of joint. In order for the length of the joint to accommodate an additional length, some portion of overlapping portions will have to be cut in terms of slot or plugs and then filled with welded materials. This also increases the strength of the joint.
When the slot is small and completely filled with weld metal, it is called plug weld. But if the periphery of the slot is filled with weld metal then it is called slot weld.