(Received 16 May 2013; accepted 28 April 2014)
Published Online: 31 December 2014
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This study was carried out to evaluate the effect of hardfacing processes on the ballistic performance of armour grade quenched and tempered (Q&T) steel welded joints. Two joints were fabricated using 4 mm thick tungsten carbide (WC) hardfaced middle layer, above and below which austenitic stainless steel (SS) layers were deposited on both sides of the hardfaced interlayer. Plasma transferred arc (PTA) hardfacing and shielded metal arc (SMA) hardfacing processes were used to deposite WC interlayer. In both joints, SS layers were deposited by shielded metal arc welding (SMAW) process. The fabricated joints were tested for its ballistic performance and the results were compared with respect to depth of penetration (DOP) on weld metal and HAZ locations. From the ballistic test results, it is observed that both the joints successfully stopped the bullet penetration at weld center line. Of the two joints, the joint made with SMA hardfacing offered a maximum resistance to the bullet penetration with a DOP of 16 mm without any bulge at the rear side of the weld center line. The gradual increment in hardness in the front layer is the primary reason for the successful intact of the bullet with a lesser depth of penetration.
Associate Professor, Department of Mechanical Engineering, M. Kumarasamy College of Engineering (Autonomous), Thalavapalayam, Karur, Tamil Nadu
Professor, Center for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Tamil Nadu
Madhusudhan Reddy, G.
Scientist G, Group Head, Solidification Technology Division, Metal Joining Group, Defence Metallurgical Research Laboratory (DMRL), Kanchanbaugh, Hyderabad,
Stock #: MPC20130021