ANALYSIS, INVESTIGATION AND TESTING OF ADAPTABILITY OF PLASMA ARC WELDING FOR MILD STEEL PLATES

This project is to make plasma arc welding of mild steel plates of various thickness. For that the edge preparation of the plates is done by filing the edges of the pieces with 45 degrees inclination. Later the plasma arc machine is make ready by filling the torch with distilled water and acetone on 50:50 volume by volume basis. This is further continued during compete welding processes. While doing welding the voltage, current and resistance are generated were recorded and found. And in addition the time required to weld, against length of tool travel for weld recorded. All these are analyzed for finding the interrelationships among the parameters. Later the hardness, microstructure were derived. After that the testing is done for knowing the weld strength and defects present if any. The hardness is found using brinnel's hardness machine. And the testing is done in two ways. They are Non destructive testing and destructive testing. In the non destructive testing Radiographic testing and Die penetrate testing were used. And in destructive testing compression and tensile tests were used.