MUMBAI, India, Oct. 12 -- Intellectual Property India has published a patent application (202641118888 A) filed by Vallurupalli Nageswara Rao Vignana Jyothi Institute Of Engineering And Technology on October 05, 2026, for An Optimized Friction Stir Welding Method For High-Strength Joining Of Dissimilar Aa2014-T3 And Aa7075-T6 Aluminum Alloys.
Inventor includes Dr. B. V. R. Ravi Kumar.
The application for the patent was published on October 09, 2026, under issue no. 41/2026.
Abstract: ABSTRACT [0060] For aerospace and defense, stronger, yet lighter joints between dissimilar metals are growing in need. Metals such as the high strength aluminum AA2014-T3 and AA7075-T6 have high strength-to-weight ratios making them an attractive solution to many engineering problems. Yet, traditional fusion welding processes typically produce porosity and solidification cracks in welds in precipitation-hardened aluminum alloys like these. With its absence of melting, and creation of bond through plastic shear, the Friction Stir Welding (FSW) solid-state process has become a reliable solution to produce consistent joints with no solidification defects in the heat affected zone. [0061] This invention conducts an experimental investigation to evaluate the effect of different FSW system parameters on the mechanical overall performance, surface profile, and beauty of diverse AA2014 and AA 7075 buttwelds. The study focuses on the essential evaluation of the tool inclination angle (0°, 1°, and a few°) that controls fabric confinement and downward forging force. This study uses a Taguchi L9 Design of Experiments (DOE) to evaluate some elements. The selected variables included rotational speeds of 900, 1200, and 1500 RPM; welding speeds of 40, 50, and 60 mm/min; and 3 specific device pin shapes: cylindrical, square, and hexagonal. The welding experiments were conducted on a modified vertical milling machine with specially designed and inflexible tool retention mechanisms and heat-treated AISI H13 tool steel equipment. Ultimately, the objective of this research is to understand the relationship between the method parameters and the subsequent first-class joint, and to decide the appropriate parameters to achieve unconsolidated and high-strength joints for compressive aerospace cargo packages.
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