THE USE OF AN ARC WELDING PROCESS TO INVESTIGATE WELD PROPERTIES ON LAP JOINT

The main objective of shielded metal arc welding is to perform arc welding using a covered metal electrode to shield the weld joint, welding is one of the most popular ways to combine two metal parts into one and to observe the influence of pre-welded heat treat mention heat affected zone when joining heavy thickness plates while performing SMAW.in this process the pre-welded heat input strongly affected the HAZ. Micro structure and hardness This work on the principle of heat produced by the electric arc the electrode used in the process is consumable the current type used in the process either AC or DC depending on base metal. The parameters of this process weld process are current, length of the arc, angle. SMAW arc welding uses the arc heat to melt the base metal and tip of a consumable electrode. The electrode and base metal are part of the electric circuit or welding circuit. The welding starts when the tip of the electrode and the base metal come to contact and here should be some distance between the base metal and electrode. The heat melts the tip and the surface of the work. Tiny globlues of molten metal form on the electrode tip then to the arc into the metal pool. Filler is deposited as the electrode is consumed. The flux coating disintegeres and gives off vapour’s that serve as a shielding gas and provides a protective layer of slag. After chipping and cleaning the destructive and non-destructive testing is done. This process is widely used in many industrial applications due to its versatility, simplicity and indoor and outdoor applicability. SMAW process is commonly used across range of including aerospace, automotive, energy and construction among others.