Some studies into weldability of rice husk ash aluminium matrix composites using TIG welding

Abstract

The rice husk generated during cultivation of paddy crop is considered as a waste. Due to its non-biodegradable nature it creates problems like dumping, disposal and soil pollution which makes the land infertile. The rice husk ash (RHA) is a successful advancement of recycling technology that allows its use for making metal matrix composite. The density of composites decreases, whereas hardness and tensile strength increases with the reinforcement of rice husk ash. Strength and quality of weldments depends largely on the weight % of RHA. The present study investigated an experimental design approach to study weldability and the performance of AA 6063/10% RHA metal matrix composite using TIG welding process. Taguchi’s L9 orthogonal array design matrix has been followed. Mechanical Testing-tensile testing, impact testing and micro hardness testing have been performed to check the performance of welded joints. The results indicated that ultimate tensile strength is affected mainly by shielding gas flow rate; impact strength by welding current and micro hardness is affected mainly by welding speed. The AA 6063/10% RHA metal matrix composites are recommended for fabrication by using TIG welding process.