SMAW Welding

Welding is the process of switching between two or more metals by using heat energy. Metal around the welds / connections, will experience a rapid thermal cycling which leads to complex changes, metallurgy, deformation and thermal stresses. It is very closely related to the strength, weld defects, and so forth which in general will have a fatal effect on the safety of welded construction. Welding process involves heating and cooling, in general, the microstructure of the metal depends on the speed of the cooling of the initial phase formation temperature up to room temperature. Because of this structural change on its own mechanical properties owned are also changing. Basically the weld area consists of three parts, namely the weld metal (weld metal), heat affected area is often referred to as the Heat Affected Zone (HAZ), and a metal stem that is not affected by heat. Weld metal region is part of the metal during welding melts and then freezes. Regional influence of heat or base metal HAZ is adjacent to the weld metal during welding thermal cycles of heating and rapid cooling. Unaffected parent metal heat is part of the basic metal welding where the heat and the temperature did not cause changes in the structure and properties. In addition there are three parts of other parts of the area which limits the area between the weld metal and HAZ are called the limit of welding. All events during cooling of the welding process is similar to cooling in the foundry difference is: 1. Cooling in the welding speed is higher 2. In the weld heat source moves straight 3. Thawing and freezing in the welding occurs continuously 4. freezing of weld metal from the metal wall of the parent which can be equated with the walls of the casting mold, only in the welding, the weld metal should be the one with the parent metal, while the foundry should be otherwise.