Optimization of Mechanical Properties of Friction Stir Spot Welded Joints for Dissimilar Aluminum Alloys (AA2024-T3 and AA 5754-H114)

Abstract

In this work, friction stir spot welding (FSSW) was performed for dissimilar aluminum alloys (AA2024-T3 and AA5754-H114) sheets of 2 mm thick at different tool rotational speeds (800, 1000 and 1250 rpm), plunging times (30, 60 and 90 s) and tool pin profile or geometry (threaded cylindrical with flute, tapered cylindrical and straight cylindrical). Process parameters were optimized by using Taguchi technique and depending on design of experiment (DOE), and data analysis based on the Taguchi method is performed by utilizing the Minitab 17 to estimate the significant factors of the FSSW and main effects using few experimental tests only. It was found that maximum shear force was (2860 N) obtained at best welding process parameters: 800 rpm of rotation speed, 60 s of plunging time and taper cylindrical pin which are obtained from the DOE. Pareto chart of the standardized effects of tensile shear results showed that the pin profile was the most effective parameter than other welding parameters (rotation speed and plunging time). Also it was found that the contribution percentage was 61.5 % for pin profile followed by tool rotation speed 20.1 % and plunging time 18.4 %.

Parametric optimization of microwave reflux extraction of spice oleoresin from white pepper (Piper nigrum)

“…The optimum response means was computed at different operating level for each of the extraction factor as reported by Abbass et al (2016). (2016).…”

Experimental investigation to limit the effecting of friction stir welding factors on the strength of AA6061-T651

“…Welding processes are classified into two major classes: fusion without exerted forces and solid state welding with large exerted pressure [1][2][3]. Solid-state methods consist of a set of welding processes that produce joining by the application of pressure at a temperature less than melting points of the parent metal and filler.…”

“…FSW has a remarkably simple concept. A non-consumable rotating tool with a specially designed pin and shoulder is plunged into the surface of the contact surfaces of two plates to be joined as shown in figure (1). The friction stirring tool consists of a shoulder and a probe (pin).…”

“…They observed that the strength and hardness are gradually increased at 1200 rpm and the efficiency of joining reached 94%. Mustafa et al [17] analysed the effect of processing parameters on the mechanical and metallurgical properties of dissimilar joints of AA6082-AA6061 produced by FSW. Different FSW samples were produced by changing the welding speeds as 50 and 62 mm/min and by changing the alloy positioned on the advancing side of the tool.…”

“…Standard chemical composition and chemical analysis were conducted in a specialized institute of engineering industries for the aluminium alloy. According to the examination certificate number 122 and as represented in the table(1), the test was conducted at 21.5 о C with 41% humidity.…”