Optimizing The Machining Parameters For Minimum Surface Roughness In Turning Al/6% SiC/6%RHA Hybrid Composites

AbstractThis paper discusses the use of the Taguchi experimental design technique to find the optimal parameters while machining Al/6% SiCp/6%RHAp metal matrix hybrid composites. The hybrid composites were fabricated using the stir casting technique. The objective of this work is to investigate the effect of the controllable variables like spindle speed, feed and depth of cut on surface roughness while turning the hybrid composite. Taguchi's L9, orthogonal arrays under different combinations are used for experimentation. The influence of the parameters is also evaluated using signal to noise (S/N) ratio analysis. Optimum parameters which give minimum surface roughness are obtained. S/N plot is drawn and the results are validated using analysis of variance (ANOVA) and the percentage of contribution of each parameter is determined. The scanning electron microscope was used to investigate the worn machined surface of the hybrid composites and the related mechanisms are explained and presented. The 3D surface topography parameter (roughness, skewness, Kurtosis) is also analyzed to predict the worn machined surface of hybrid composites using SPIP software

Advances in Plasma Arc Welding: A Review

The nature of welding in the aeronautical industry is characterized by low unit production, high unit cost, extreme reliability and severe service conditions. These characteristics point towards more expensive and more concentrated heat sources such as plasma arc, laser beam and electron beam welding as the processes of choice for welding of critical components. Among various precision welding processes, Plasma Arc welding has gained importance in small and medium scale industries manufacturing bellows , diaphragms etc because of less expensive and easy to operate. This paper reviews the works on Plasma Arc welding and associated phenomena such as Micro Plasma Arc Welding, Variable Polarity Plasma Arc welding and Keyhole Plasma Arc Welding. The review covers works carried out by various researchers on various metals using different modes of plasma arc

Influence of dislocation density on the residual stresses induced while machining Al/SiC/RHA hybrid composites

The present study aims at finding the residual stresses on aluminum hybrid composites during turning operation. The composites with varying percentage by weight reinforcement of 2, 4, 6 and 8 RHA and SiC in equal proportions were fabricated using two stage stir casting process. X-ray diffraction was used to study the residual stresses on the surface layer of the machined surface. It was observed that the residual stresses generated during casting were considerably larger when compared to the stresses generated during machining of composites. It was also noticed that the residual stresses were found to decrease with the increase in the reinforcement and increases with the increase in cutting speed. The related mechanisms are explained and presented in this work

Study on Weld Quality Characteristics of Micro Plasma Arc Welded Austenitic Stainless Steels

AbstractMicro Plasma Arc Welding (MPAW) is one of the important arc welding process commonly using in sheet metal industry for manufacturing metal bellows, metal diaphragms etc. The paper focuses on weld quality characteristics like weld bead geometry, grain size, hardness and ultimate tensile strength of MPAW welded joints of various austenitic stainless steels namely AISI 316L, AISI 316Ti, and AISI 321. From the analysis carried out it is noticed that for the same thickness of work piece material and same welding conditions, AISI 304L has achieved sound weld bead geometry, highest tensile strength and hardness. However it is noticed that AISI 316L has attained lowest tensile strength, AISI 321 has lowest hardness and grain size