Mechanical and Micro-Structural Characterisations of Submerged Arc Welded Steel Plates

Abstract

The goal of the study is to find out how the welding parameters current (I), voltage (V), and speed (S) affect the mechanical characteristics and mechanical characterization of the submerged arc welding (SAW) process. Tensile strength, Microhardness, Impact load was determined using the universal testing machine (UTM), micro Rockwell Hardness machine and Impact load by Charpy and Izod method. With the help of several Submerged Arc Welding (SAW) factors, notably welding voltage (V), welding current (I), and welding speed, this research aims to examine and analyze the mechanical characteristics of welded connections. (S). The investigation involves cutting and machining samples of welded joints, which are then tested for mechanical qualities using tensile, impact toughness, and hardness methods. Analyses were done on how welding parameters affect the mechanical characteristics of welded joints. It has been noted that when heat input increases, the hardness of the weld first increases up to 100 HRC before declining as heat input continues to increase. The ultimate tensile strength and yield strength of the welded joints increases as the heat input increases, but it decline as the heat input increases more. The slower cooling rate has been achieved with high input heat consequent the coarse grains achieved in the weld metal. In contrast the low input heat results in the faster cooling and finer microstructure.