Souvenir Containing Abstracts - YMCA University of Science ...

National Conference on Trends and Advances in Mechanical Engineering
MECHANICAL PROPERTIES OF FRICTION STIR WELDED DISSIMILAR METALS
1* 2 3
Ratnesh Kumar Raj Singh , Rajesh Prasad , Sunil Pandey
1
Research Scholar, IIT Delhi, New Delhi, India
2
Associate Professor, Department of Applied Mechanics, IIT Delhi, New Delhi, India
3
Professor, Department of Mechanical Engineering, IIT Delhi, New Delhi, India
TAME-2012
OCT 19-20, 2012
The aim of present study was to analyse the influence of the microstructures and mechanical properties of friction stir
welded butt joint of 6101 aluminium alloy and pure copper plates in 3 mm thickness. With this aim, welds were produced
using Tungsten Carbide tools, with a cylindrical pin tool having 5 mm and 20 mm diameter of pin and shoulder respectively.
Copper plates were kept in advancing side of weld. The microstructure of weld were studied by optical microscopy and grain
size in different regions were analyze. Vicker's microhardness test (as per ASTM E384-89) were done in transverse direction
of weld to check the hardness distribution in weld nugget. Transverse tensile test (as per ASTM E8 M) were performed to
evaluate the weakest portion of weld joints. Scanning Electron Microscope were used to observe the fracture surfaces.
EDAX analysis were done to find out the mixing characteristic of two metals.
Key words: Friction Stir Welding, Aluminium alloy, Pure Copper, Hardness, Tensile testing
***
MICROSTRUCTURE AND WELDABILITY EVALUATION OF DISSIMILAR METAL
JOINT USING PASTE TECHNIQUE FOR BUTTERING LAYERS
1 2 3
Dinesh Rathod , Hariom Choudhary , Sunil Pandey
1
Research Scholar, dineshvrathod@gmail.com
2 3
Research Scholar, Professor,
Department of Mechanical Engineering, IIT Delhi
The main objective of present work was to study the micro-structural changes due to buttering deposit on AISI 1020 steel for
dissimilar metal joint of AISI 1020 steel to SS 304 steel. Dissimilar metal joints are extensively used in many industrial
applications but due to weldability related issues, they cannot perform satisfactory life. The difference in chemical
composition, coefficient of thermal expansion and mechanical properties affects the weldability of the joint. For
maintaining elemental compatibility, buttering technique is often used for such joint. It is quite difficult to select the
consumables for the buttering layers, which will satisfy the requirement of desirable chemical composition. Carbon
migration is one of the major causes for buttering layer deposits. Nickel act as a barrier for carbon migration, so paste
technique was used to deposit the buttering layer. The paste was prepared with Nickel powder, ferro-vanadium and ferrotitanium
powders and deposited using Tungsten Inert Gas (TIG) welding and Shielded Metal Arc (SMAW) welding.
Subsequent layer deposit was made using SMAW using Inconel 182 consumables. Weld joint was prepared between said
base metals using SMAW process and Metal Inert Gas (MIG) welding. Micro-structural analysis and micro-hardness
analysis were carried out. Nickel rich paste layer deposited using TIG observed micro-cracks or solidification cracks. When
deposited with SMAW, due to dilution effect, nickel composition reduced and ferrite content changes in buttering layer
hence no any cracks observed. Nickel paste with controlled parameters with direct deposit using SMAW can be successfully
applied for such dissimilar metal joints.
Keywords: Paste technique, Dissimilar Metal Joint, Buttering, Carbon migration, welding
***
ELECTRICAL DISCHARGE GRINDING (EDG): A REVIEW
1* 2
Ravindra Nath Yadav ,Vinod Yadava
Department of Mechanical Engineering, Motilal Nehru National Institute of Technology, Allahabad, India
*Corresponding author; Email: *rnymnnit@yahoo.com; vinody@mnnit.ac.in
The machining of thin and fragile material is very difficult for manufacturing industries and rapid demand of requirement
could not be achieved. Electrical discharge machining is more acceptable machine tool for machining hard and brittle
electrically conductive materials but its productivity is very slow. In past decade, researchers are focus on electrical
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Department of Mechanical Engineering, YMCA University of Science and Technology, Faridabad