Welding and its Type

Welding : It is defined as joining of two metal (same or different) with or without pressure , with or without the use of filler material and with or without the use of heat.

Types of welding:

• Pressure Welding: In this type of welding metal is  upto welding temperature(below melting point) then pressure is applied on it to join the metal
  Example : Forge Welding , Resistance Arc Welding
• Fusion Welding : In this metal is heated upto its melting temperature and union is produced on subsequent solidification.
  Example : Gas Welding , Arc Welding , Thermit Welding

Advantage of Welding:

• Low manufacturing cost
• Strong joints are formed as compare to bolt and rivet joint
• Can repair broken and defective metals. Because of that it prevents us from re buying the things
• Save material while making joint
• Reduce Labour cost
• Without welding you can't imagine a single plane or rocket welding is necessity in this modern times.
• No unwanted noise produce while making joint like riveting process

Disadvantage of Welding:

• Skilled person is required to do welding
• Some welding are expensive but necessity so they increase cost (example plasma arc welding,electron beam welding etc)
• Defects arise during welding process are difficult to detect (example air pocket , slag inclusion)
• Low fatigue strenght due to brittle nature of the welding