Millisecond Pulsed Laser Micro-drilling of Stainless Steel – Optimizing Hole Quality Using Response Surface Methodology

• DOI: 10.2961/jlmn.2023.03.2012
• Publication Date: 2023-11-26T06:24:02Z
• Authors: Arvind Kumar Gupta; R. K. Singh; Deepak Marla
• Keywords: Millisecond; Laser drilling; Pulsed laser

Quasi-continuous wave (QCW) fiber lasers have revolutionized micro-hole drilling in various industries by generating highenergy pulses lasting milliseconds.A single pulse of this laser can drill micro-holes with aspect ratios exceeding 10 on metal sheets ranging from 1-5 mm thick.However, challenges like hole taper and burr formation limited their widespread adoption.Despite being introduced 2011, there is research QCW lasers.To overcome the challenges, understanding quality optimizing process parameters are required.Therefore, experiments been conducted when energy greater than threshold 3 thickness SS304 sample to identify an optimal range.A 2-factor, 3-level face-centered central composite design employed power duration range.Optimal conditions were determined: a 308 μm minimum entry diameter at 3000 W 1 ms width (yielding ratio 10), 0.38° angle 5902 8 width, 39 mean height 4779 2 width.These findings pave path for enhanced methods create superior micro-holes.