Difinisi Kimpalan

At one time,the simple definition of welding are "Joining metals through heating them to a molten state and fusing them together."As technical progress in welding processes has advanced,the definition has had to change.

There are now two basic forms of welding;

1. Fusion
2. Non-fusion

The former is the most common,and it involves the actual melting of the parent metals being joined.Not all welding today involves mealting.Non-fusion welding is most commonly represented by soldering and brazing,two processes of joining metals where the parent metals is heated,but not melted,and a second or "filler" metals is melted between them,forming a strong bond when all are cooled.

Pressure and friction alone can weld  metals together,such as when a machinist turns down a piece of metal in a lathe.Often kinds of "cold" welding may today involve sound and light,as in sonic-welding or laser-welding.

Today,the term "welding" has even been applied to the processes of joining no-metallic materials,such as plastic-welding which sometimes involves a fusion of materials as a result of heat or chemical action. As kids,we have all played with plastic models that we constructed using "glues" that would react with and actually "melt-together" the two pieces we were joining.

For today's definition of welding to be all-encompassing,it would have to read "the joining of metals and plastics without the use of fasteners.