Surface Modifications Through Plasma Enhanced Shielded Metal Arc Welding Process (PESMAW)
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Authors
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Deptt. of Mechanical Engineering, Indian Institute of Technology Delhi, (IITD), New Delhi ,IN
Sunil Pandey -
Dept. of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta ,CATahir I. Khan
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Dept. of Mechanical Engineering, Indian Institute of Technology Delhi, (IITD), New Delhi - 110016. ,INS. Thiruchitrambalam
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Dept. of Mechanical Engineering, Raazi Engineering College University of Raazi, Kermaanshah - 67139 ,IRMasood Aghakhani
Keywords:
Surfacing, Surface Melting, Wear Resistance, Tribology of Steels, Surface Alloying, Hardness, Plain Carbon Steels, Plasma Enhanced Shielded Metal Arc Welding.Abstract
Low alloyed steels are widely employed in the agricultural, transport and metal processing industries and are often treated to improve surface wear resistant properties. In this study, the surface of plain carbon steel is melted using a metal arc heat source and the surfaces are simultaneously alloyed using a metallic powder and nitrogen gas. This process is novel in that the nitrogen gas carries metallic powder through the electrode and into the plasma created between the tip of the electrode and substrate surface. The changes in wear characteristics of the modified surfaces are monitored using a pin-on-plate wear testing machine and micro-indentation hardness measurements as a function of depth from the surface. Preliminary results indicate a significant increase in wear resistance for surfaces alloyed with nitrogen and chromium powder compared to the untreated surfaces. These changes in wear properties are explained through changes in micro structural features within the solidified surface.
