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Aghakhani, Masood
- Surface Modifications Through Plasma Enhanced Shielded Metal Arc Welding Process (PESMAW)
Authors
1 Deptt. of Mechanical Engineering, Indian Institute of Technology Delhi, (IITD), New Delhi, IN
2 Dept. of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta, CA
3 Dept. of Mechanical Engineering, Indian Institute of Technology Delhi, (IITD), New Delhi - 110016., IN
4 Dept. of Mechanical Engineering, Raazi Engineering College University of Raazi, Kermaanshah - 67139, IR
Source
Indian Welding Journal, Vol 36, No 2 (2003), Pagination: 27-30Abstract
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.Keywords
Surfacing, Surface Melting, Wear Resistance, Tribology of Steels, Surface Alloying, Hardness, Plain Carbon Steels, Plasma Enhanced Shielded Metal Arc Welding.
- Welding Current in Submerged Arc Welding
Authors
1 Dept. of Mechanical Engineering, Indian Institute of Technology, Delhi, IN
2 Dept. of Mechanical Engineering, SBCET, Phirozpur, Punjab, IN
3 International Division, DST, New Delhi, IN
4 Dept. of Mechanical Engineering, Raazi Engineering College, Kermaanshah, IR
Source
Indian Welding Journal, Vol 36, No 1 (2003), Pagination: 16-22Abstract
A relationship between welding current and various welding parameters has been proposed. The relationship can be used to predict welding current and melting rates in submerged arc welding process. Two-level half-fractional factorial design was used to investigate and quantify the direct and interaction effects of four process parameters on welding current in SAW of mild steel.
Wire feed rate, open circuit voltage, welding speed and plate thickness were taken as the welding parameters to investigate the main and interaction effects on the welding current. A model has been proposed for predicting the welding current in submerged arc welding. The adequacy of the model was tested by the use of analysis of variance technique and the significance of the coefficients was tested by the student’s ‘t’ test. The estimated and observed values of the weakling current have been compared through a scatter diagram. The main and interaction effects of different parameters involved have been presented in graphical form.