Professor of School of Engineering, Design and Built Environment, Western Sydney University, Australia. His research interests cover Industry 4.0, Additive Manufacturing, Advanced Engineering Materials and Structures (Metals and Composites), Multi-scale Modelling of Materials and Structures, Metal Forming and Metal Surface Treatment.
Abstract—The AFNOR 15CDV6 steel is high strength steel with relatively low level alloy content. By
processing the steel through ESR with inoculation a marginal increase in strength and further
increase in ductility and notch toughness can be obtained. The strength of the steel is inadequate
for its use in fabrication of rocket motor casing in the Indian Space Programme. By increasing
both carbon and chromium content of the AFNOR 15CDV6 steel strength can be increased,
primarily as a cost effective for space launch vehicle applications. Welding is a major step in the
fabrication of most of the pressure vessels, structures and equipments. Steels with carbon
equivalent in excess of 0.40wt% shows a tendency to form martensite on welding, and therefore
are considered difficult to weld. This ESR modified 15CDV6 material has a carbon equivalent
value of nearly 1.0 that classified it as a very difficult to weld steel. In the present work, ESR
modified 15CDV6 material welding was carried out successfully by Auto GTAW as well as Manual
GTAW, without preheating. This was carried out by modification of welding parameters, cleaning
process, tacking sequence etc. Mechanical Properties of the Weld are meeting requirements.
Index Terms—AFNOR 15CDV6, ESR, GTAW, Chromium, Molybdenum, Vanadium, Bainitic steel
Cite: M Chandra Sekhar, D Srinivasa Rao and Dasari Ramesh, "Welding Development in ESR Modified 15CDV6 Material," International Journal of Mechanical Engineering and Robotics Research, Vol. 3, No. 3, pp. 499-504, July 2014.
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