The mechanism of remote cutting of metals by CO2-laser radiation

Attenuation of laser radiation by the flame of burning hydrocarbons and efficiency of remote cutting of metals

“…It is seen, that at I 0 = 10 6 W/cm 2 as maximal velocity as well as the efficiency exceed these factors at I 0 = 10 4 W/cm 2 for all values of the plate thickness. The reason of this is increase of the role of the vapour recoil momentum at melt removal [8], the influence of which can neglect at removal under action of the gravity force [9,10] The efficient remote cutting by laser radiation with an increased intensity ∼10 5 W/cm 2 is possible also at cutting of the metals of largest thickness typical for cutting of the fittings at the accident. As an example in figure 6 the picture of the frontal cut on the verticality A40G steel plate with a thickness H = 60 mm is shown.…”

Simulation of the main physical processes in remote laser penetration with large laser spot size

“…The only difference is the laser spot size used in this article is a lot larger, on the order of few cm 2 . This is driven by applications that aim at clearing well mouths from damaged equipment during emergency and recovery work in oil and gas fields and dismantling radioactive structures found in obsolete nuclear plants first described by Tahmouch et al 7 and Antonova et al 8 or at demining from a safe distance by using extremely powerful solid-state laser developed by a team of Livermore physicists and engineers as reported by Heller in a series of Lawrence Livermore National Laboratory Science and Technology Review articles. 9,10 This effort won a 2004 Research and Development 100 Award for its promise of revolutionizing the practice of demining.…”