Investigations for Statistically Controlled Resistance Spot Welding Solution of Stainless Steel

Abstract

Abstract:The purpose of the present investigations is to study sensitization point of view) for 304 stainless steel (SS) INTRODUCTIONSensitization is a major problem in welding of SS that affects the alloys durability 1 . SS is commonly welded by resistance spot welding process process requires the application of both heat and pressure to achieve a sound joint. The heat generated depends upon the current/ voltage, the time current is passed and the resistance at the interface The resistance is a function of the resistivity and surface condition of the parent material, the size, shape and material of the electrodes and the pressure applied by the electrodes 4 . The literature review reveals that lot of work has been reported on the optimization of physical/mechanical properties of welded joints and reduction of sensitization during welding of 304 SS by different techniques hitherto no work has been reported on controlled RSWP based solution of 304SS from sensitization point of view. So, in the present work effort has been made to investigate controlled RSWP solution of 304 SS Taguchi model) with focus on sensitization. Table and 2 respectively shows chemical composition of workpiece material and input parameters (namely: welding time, voltage and coolant flow rate (CFR and their levels based upon Taguchi L9 investigation of sensitization phenomenon in 304 SS. The output parameter set for study are hardness and tensile strength. EXPERIMENTATIONBased upon Table 2 and Table 3 shows observations (with three repitations) for hardness (H1, H2 and H3) and tensile strength (T1, T2 and T3) of welded joints with RSWP.Further based upon