Thursday, 14 November 2013


In today's world the importance of welding spread over a range,in most of the modern fabrication works welding science has numerous applications in different forms, covering a fairly wide range of such work.

Welding is an alternative method for casting or forging and as a replacement for bolted and riveted
joints. It is also used as a repair medium, i.e., to reunite metal at a crack to build up a small part that has broken off such as gear tooth or to repair a worm surfaces such as bearing surfaces.

Features of welding:

1. The welding structures are normally lighter than riveted or bolted structures.
2. The welding joints provide maximum efficiency, which is not possible in other type of joints.
3. The addition and alterations can be easily made in the existing structure.
4. A welded joint has a great strength.
5. The welding provides very rigid joints.
6. The process of welding takes less time than other type of joints.


Now question is what is the basic concept of welding ? 
And the best possible answer is 

" Welding is a process of joining two similar or dissimilar metals with the help of heat or pressure or by some other means." The cost of welding is very less as compared to other processes and forms a strong joint.

For this reason it is largely used in the following fields of engineering:

1. Manufacturing of machine tools, auto parts, cycle parts, etc.
2. Fabrication of farm machinery & equipment.
3. Fabrication of buildings, bridges & ships.
4. Construction of boilers, furnaces, railways, cars, aeroplanes, rockets and missiles.
5. Manufacturing of television sets, refrigerators, kitchen cabinets, etc.

A weld will inherit the common drawback of brittleness, which is a disadvantage. The emphasis in welding technique should, therefore, be preventing this brittleness to the maximum possible extent.