Welding is among one of the grafting technique to melt some metals with the parent metal and filler metal with or without pressure and with or without metal enhancer and generate connections continue.
The scope of the use of welding techniques in the construction is very broad, covering shipbuilding, bridges, steel frame, pressure vessels, pipes rapidly, pipelines and so on.
In addition to the manufacture, welding processes can also be used for reparations for example, to fill the holes in the castings. Make a layer of solidified weld on tooling parts are worn and various other repairs.
Welding is not the main purpose of construction, but only a means to achieve better production economies. Therefore the design of welding and welding means should really pay attention and show the correspondence between the properties lasdengan usability and usefulness of the surrounding construction.
Welding procedure seems very simple, but actually in it many of the problems to be overcome where the solution requires a variety of penngetahuan.
Yet, in welding, penngetahuan must participate accompany the practice, in more detail can be said that the design of buildings and machinery construction with welded joints, should be planned also about the ways of welding. This method of inspection, welding material and the type of welding to be used, based on the function of parts of buildings or machinery designed.
Based on the definition of DIN (Deutch Industrie Normen) welding is a metallurgical bond at the junction of metal alloys that are implemented in a molten or liquid state. From these definitions can be further elaborated that the weld is the local connection of several metal rods by using thermal energy. At this time has been used more than 40 types of welding including welding carried out by pressing the two metals to be joined so that the bonding occurs between atoms of molecules from metal disambungkan.klasifikasi of welding methods will be explained further.
At this time of welding and cutting welding workmanship is very important in the production technology with metal raw materials. From the first development is very fast has a lot of new technologies that are found. So it may be said almost no metal can be cut and welded in ways that exist at this time.
In this chapter will be explained several ways penngelasan and cuts that have been widely used while the application in practice will be explained in other chapters
