Process Parameters Optimization of an Aluminium Alloy with Pulsed Gas Tungsten Arc Welding (GTAW) Using Gas Mixtures

Abstract

ABSTRACT

Development of a predictive model for determining mechanical properties of AA 6061 using regression analysis

“…Also these researchers determined the measured % Elong of AA 7039 to be between 1.84 and 5.9%, whereas the predicted value of the % Elong is within the range of 1.72-6.32%. Kumar et al (2011) applied the modified Taguchi method to optimize process parameters. In their research work, they determined UTS and % Elong of AA 6061, the experimental results obtained for UTS are within the range of 256.40-386.07 MPa, with a corresponding predicted UTS of 389.31 MPa.…”

“…In this study, the ductile material considered is the AA 6061 aluminum alloy. Kumar, Kolhe, Morey, and Datta (2011) wrote that aluminum alloy 6061 (Al-Mg-Si) is widely used for the fabrication of food processing equipment, chemical containers, passenger cars, road tankers, and railway transport systems due to its high specific strength, excellent weldability, and resistance to corrosion. These aluminum alloy 6061 plates were welded with the gas metal arc welding (GMAW) equipment used to make weld deposits.…”

Effects of Heat Input on the Mechanical and Metallurgical Characteristics of Tig Welded Incoloy 800Ht Joints

“…3 shows the sensitization issue that has occurred in the HAZ for experiment 4 due to the high heat input concentration. Sensitization is a breakdown in corrosion resistance associated with the precipitation of chromium-rich carbides such as M 23 C 6 and M 7 C 3 along grain boundaries. Interstitial carbon can diffuse rapidly whereas chromium diffuses much more slowly.…”

“…Titanium is added to incoloy 800H to act as a carbide-and nitride-former, thereby encouraging the precipitation of titanium nitrides and titanium carbides. At temperatures between 700°C and 800°C, both M 23 C 6 and TiC are commonly present. Although TiC is more thermodynamically stable at these temperatures, the kinetics frequently favored the formation of M 23 C 6 [5].…”

“…Tungsten inert arc gas welding (TIG) uses a tungsten electrode protected by an inert gas like helium or argon to shield the molten weld pool and red hot filler wire from atmospheric contaminants. This process can be used for joining a number of common metals such as steel, magnesium and aluminium of thickness 1-6 mm in almost all positions [6]. The performance of the welded structures is usually limited by failure commencement within the heat affected zone (HAZ) of the base metal, particularly inside the coarse-grain area of the HAZ next to to the weld metal.…”