Page 1 of 1
5. A steel sheet having 4 mm thickness is scanned with a laser beam of diameter 3 mm, at a scan speed of 2.4 m/min, with
Posted: Thu May 05, 2022 6:29 pm
by answerhappygod
- 5 A Steel Sheet Having 4 Mm Thickness Is Scanned With A Laser Beam Of Diameter 3 Mm At A Scan Speed Of 2 4 M Min With 1 (31.28 KiB) Viewed 33 times
5. A steel sheet having 4 mm thickness is scanned with a laser beam of diameter 3 mm, at a scan speed of 2.4 m/min, with 700 W laser power. Determine whether the scanned surface shall reach the melting temperature or not. Consider the ambient temperature to be 27 °C and the following properties of the sheet: Thermal conductivity, K = 15 W/m.K, Specific heat = 480 J/kg.K, Density = 7900 kg/m³, Absorptivity = 30%, Melting point = 1450 °C H8 Temperature rise, VT = ; 6 = 2√√kt; K√π H is the absorbed laser power intensity, K the thermal diffusivity and t the laser beam interaction time.