WELDING DEFINITION

A welded joint is a permanent joint used extensively in fabrication process. An electronic process for fusion welding arc or gas welding is used for fusion of the material. It is also used for repairwork build up a small part that has broken off e.g. to repair a worn surface.

CLASSIFICATION OF WELDING

Welding processes are mainly classified as:

1. Fusion welding
2. Forge welding

Fusion welding

In this process the part to be joined are held in proper position while the molten metal is supplied to the joint. By heating the joint surface become plastic or molten. When the molten metal fuses the joint is formed.

Forge welding

In this type of welding the parts are first heated to a proper temperature in a furnace or forge and then hammered

Advantages:

In this type of welding the parts are first heated to a proper temperature in a furnace or forge and then hammered

The following are the advantages of welding

1. Welded joints are greater in strength
2. The process are noiseless
3. Welded joint can easily be repaired
4. Welded joints have low initial cost
5. Less matching is required after welding

Disadvantages:

In this type of welding the parts are first heated to a proper temperature in a furnace or forge and then hammered

The following are the advantages of welding

• Welded joints can not be used for collision and vibration.
• Welded joints can not be assembled and reassembled.

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