Study on Newer Techniques of TIG Welding and Microstructure of Welded Parts of Aluminium Composites and Alloys: A Review

Over the years, alloys and metal matix composites (MMC) has developed into an essential material for modern manufacturing processes. Especially, aluminium based MMCs have a widespread importance due to their physical and chemical properties making them applicable for aviation and aerospace industries. Also, lightness and high strength-to-weight ratio are two important factors for their widespread usage. Manufacturing in these industries involve joining processes, wherein welding plays primary role. In welding of aluminium, Tungsten Inert Gas (TIG) welding process is highly preferred. Although, aluminium welding confronts a major problem due to formation of alumina (Al2O3), however this is overcome due to usage of pulsed TIG welding. In this process, one half of the pulse breaks the alumina layer to aid in welding. This paper investigates various modern techniques of welding aluminium alloys and metal matrix composites. Also, the findings regarding microstructure and mechanical properties of the welded parts are studied.