A REVIEW PAPER ON PRE-HEAT TREATMENT ON WELD JOINTS

The main objective of shielded metal is welding or stick 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. To observe the influence of pre welded heat treatment on heat affected zone when joining heavy thickness plates while performing SMA W. In this process the pre-welded heat treatment and heat input strongly affected the HAZ microstructure and hardness. This works 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, manipulation, and speed. 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 and are struck between the tip of the electrode and base metal. The heat melts the tip and the surface of the work. Tiny globules of molten metal form on the electrode tip then transfer to the arc into the molten pool. Filler is deposited as the electrode is consumed. The lux coating disintegrates and gives off vapor’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.