Pyrometric Monitoring of Gas-Assisted Cutting of Steel Using Fiber Laser

Dubrov, A.V.; Institute On Laser And Information Technology Of Russia Academy Of Science -ILIT RAS 1 Svyatoozerskaya St., Shatura, Moscow Region, 140700 Russia, Zavalov, Y.N.; Institute On Laser And Information Technology Of Russia Academy Of Science -ILIT RAS 1 Svyatoozerskaya St., Shatura, Moscow Region, 140700 Russia & Dubrov, V.D.; Institute On Laser And Information Technology Of Russia Academy Of Science -ILIT RAS 1 Svyatoozerskaya St., Shatura, Moscow Region, 140700 Russia
Measurements of the temperature in zone of action of laser radiation on the molten metal have been performed. The results are reported for different speed of cutting of mild-steel plate of 3 mm-thick with high-power fiber laser; oxygen was used as an assisted gas. Researches demonstrate that fluctuations of local temperature are related to unequal radiation absorption that associates with local deformations of surface of melt. Thus noise spectrum of those fluctuations reflects turbulent surface...