Investigation of microstructure and mechanical properties of pulsed tungsten inert gas welded aa5083 h111 and aa6082 t6 joints

Abstract

The quest for stronger and more durable welds has led to a newlineconvergence of techniques in the field of welding technology. These techniques newlinesynergistically blend novel approaches with standard ways to get the desired newlineeffect. In this thesis, we dig into the complex space of pulsed gas tungsten arc newlinewelded (PTIG) joints utilizing AA5083 and AA6082 aluminium alloys. newlineSpecifically, we investigate similar and dissimilar joints. Also, further newlinestrengthening the material by the tactical use of single pass Friction Stir newlineProcessing (FSP) is one of the focuses of the study. newlineThe delicate metallurgical examination that establishes the study newlinejourney is where the microstructural details of grains and precipitates are newlineuncovered using Scanning Electron Microscopy (SEM). SEM energydispersive newlineX-ray analysis (EDAX) elucidates the elemental composition of the newlinematerial. Experiments conducted with a Universal Testing Machine (UTM) are newlineused to investigate the mechanical environment, with the goals of methodically newlinedetermining the ultimate tensile strength, yield strength, and percentage newlineelongation. Using Vickers microhardness testing, a careful dissection of the newlinespatial distribution of hardness across weldments may be accomplished. newlineThe initial studies were focused on the similar PTIG welding of newlineAA5083-H111 aluminium alloy and similar PTIG welding of AA6082-T6 newlinealuminium alloy by varying Peak Current (PC), Pulse Frequency (PF) and newlineWelding Speed (WS). The optimization of PTIG WPP is done by using the newlinecentral composite design (CCD) of response surface methodology (RSM). The newlineDesign of experiments (DOE) uses 3 factors 5 level design to frame 20 newlineexperiments. The welding process is carried out using the experimental newlinecombinations framed by the DOE. newline