The definition of welding according to : Deutsche Industrie Normen is a metallurgical bond on a metal or alloy metal joint that is carried out in a melted or liquid state. In other words, welding is the local connection of several metal rods using heat energy. In this connection process sometimes accompanied by pressure and additional material .
Simple welding techniques have been found in the span of time between 4000 to 3000 BC. After electrical energy is used easily, welding technology is rapidly advancing so that it becomes a cutting edge connection technique. Until now, more than 40 types of welding have been used.
In the initial stages of the development of welding technology, welding is usually only used in the connections of less important repairs. But after a lot of experience and practice and a long time, now the use of welding processes and the use of welding constructions is common in all countries in the world.
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