What is welding?
Welding is a fabrication process which is used to join materials (usually metals), by causing fusion. This Fusion is done with the help of temperature (and or pressure).
It is most common fabrication process, usually used with steels or stainless steel.
Joints obtained by It are permanent in nature which means to detach welded parts we have to damage them.
Types of welding
According to place and work material, it has different types.
1. Oxy-fuel welding
It uses fuel gases and oxygen to weld metals. It requires filler material.
2. Shielded metal arc welding (SMAW)
It is a manual arc welding process that uses a consumable electrode covered with a flux to lay the weld.
3. Gas tungsten arc welding (GTAW)
4. Gas metal arc welding (GMAW)
5. Submerged arc welding
6. Electric resistance welding
Advantages of welded joints over riveted joints
- They are lighter
- Cost of welded joint is lower
- They are tight and leak proof
- Their production time is less
- There is no problem of stress concentration
- It has good appearance
- Their strength is high
- It is easy to do in many parts which is difficult to riveting
Advantages of welded structures over cast iron structures
- They are lighter in weight
- It offers more flexibility
- Its machining is easy
- Capital investment is lower
Disadvantages of welded joints
- Their capacity to damp vibrations is poor
- Parts manufactured by It are prone to thermal distortion due to heat generated
- Quality of parts manufactured depends on skills of operator
- Inspection of welded joints is costly and requires specialist