Investigation on Mechanical properties of dissimilar joints of TIG welded AISI 304 and AISI 310 steels using Response Surface Method
Abstract
Joining of dissimilar metals has found its use extensively in power generation, electronic, nuclear reactors, petrochemical and chemical industries. A variety of problems come up in dissimilar welding like cracking, large weld residual stresses, migration of atoms during welding causing stress concentration on one side of the weld, compressive and tensile stresses, stress corrosion cracking, etc. In the present work dissimilar joints of AISI 304 and AISI 310 steels are produced using Tungsten Arc Welding (TIG) welding. Welding current, flow rate of gas, welding speed and edge included angle are considered as input parameters and tensile strength, Impact strength and Maximum bending load are considered as output responses. Response Surface Method (RSM) is adopted using Central Composite Design (CCD) and 31 experiments were performed for 4 factors and 5 levels. Tensile strength, impact strength and maximum bending load are measured. Effect of welding parameters on output responses are studied and optimal combination of welding parameters are identified for desired weld quality.
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