15-10-2014, 10:05 AM
Abstracts: Welding is widely used by manufacturing engineers and production personnel to quickly and effectively set up manufacturing processes for new products. This study discusses an investigation into the use of Taguchi’s Parameter Design methodology for Parametric Study of Tungsten Inert Gas Welding of Stainless Steel & copper. In this research work, bead on plate welds were carried out on AISI 304 & Copper plates using Tungsten Inert Gas welding (TIG) process. Taguchi method is used to formulate the experimental design. Design of experiments using orthogonal array is employed to develop the weldments. The input process variables considered here include welding current, welding voltage & gas flow rate. A total no of 9 experimental runs were conducted using an L9 orthogonal array, and the ideal combination of controllable factor levels was determined for the hardness to calculate the signal-to-noise ratio. After collecting the data signal-to-noise (S/N) ratios were calculated and used in order to obtain optimum levels for every input parameter. Subsequently, using analysis of variance (ANOVA) the significant coefficients for each input parameter on tensile strength & the Hardness (PM, WZ & HAZ) were determined and validated by the brinell hardness . Brinell tests have long been the preferred method of as saying the hardness of metals during forming operations. Methods and apparatus for performing Brinell hardness test measurements produce hardness numbers and average Brinell indentation diameter readings automatically and minimize operator intervention and hence, operator error. The only objective of Measurement of Hardness by using Brinell Hardness Test. The most common uses for hardness tests is to verify the heat treatment of a part and to determine if a material has the properties necessary for its intended use. Establishing a correlation between the hardness result and the desired material property allows this, making hardness tests very useful in industrial and R&D applications.