Active and Passive Filling Stir Repairing of AISI 304 Alloy

• DOI: 10.3390/met14080911
• Publication Date: 2024-08-14T09:23:27Z
• Authors: Vincenzo Lunetto; Dario Basile; Valentino Razza; Pasquale Russo Spena
• Keywords: passive filling friction stir repair; 0209 industrial biotechnology; Mining engineering. Metallurgy; repair; active filling friction stir repair; passive filling friction stir repair; pinless tool; automotive; aerospace; repair; TN1-997; automotive; 02 engineering and technology; pinless tool; aerospace; active filling friction stir repair

This study investigates active filling friction stir repair (AF-FSR) and passive (PF-FSR) for repairing AISI 304 stainless steel sheets, focusing on addressing the challenges posed by high melting point metals. The research involved overlapping 2 mm thick sheets with pre-drilled holes of 2, 4, 6 diameters, simulating broken components. Various process parameters, including rotational speed, dwell time, use metal fillers, were tested to evaluate their impact quality. results demonstrated that PF-FSR provided superior mechanical strength AF-FSR, particularly larger pre-hole diameters. achieved higher shear tension due better defect reduced void formation, strengths exceeding 25 kN pre-holes lower variability in measurements. AF-FSR was less effective pre-holes, resulting significant voids strength. Microstructural analysis revealed facilitated more efficient material mixing filling, minimizing unrepaired regions. However, excessive speeds times led deformation flash highlighting need optimal parameter selection. Although further studies are needed, this confirms feasibility FSR techniques small defects steels, offering valuable insights sustainable manufacturing practices industries such as automotive aerospace, where reliable methods critical.