Optimization of fibre laser parameters for micro-texturing in piston ring manufacturing. - PATIL, Atulkumar; BELDAR, Pankaj; KUSHARE, Prashant; WAKCHAURE, Vishnu; SHIRSAT, Uddhav (Sigma: Journal of Engineering & Natural Sciences / Mühendislik ve Fen Bilimleri Dergisi, 2026)