Abstract
Laser cutting of intrusive rocks, including granite, gabbro, and diorite, is carried out in order to assess the cut characteristics through geometrical measurements, such as kerf width, melting width, and penetration depth. The absorption rate for each specimen at the wavelength of 1064 nm is measured using a spectrophotometer. A multimode fiber laser is used in this study with the power of 9 kW and different cutting speeds. Furthermore, nitrogen gas at 13 bar is applied as the assistant gas in order to remove the melted material effectively. As a result of the experiment, the relationship between the cutting speed and geometrical measurements is investigated. Furthermore, variations of penetration depth are performed in accordance with the number of laser cuts. In addition, through energy dispersive X-ray (EDX) element mapping, minerals that comprise the rocks are classified and characterized. Subsequently, the changes in the microstructure and chemical composition of each specimen, before and after laser cutting, are compared using scanning electron microscope (SEM) and EDX analyses. Experimental results demonstrate that the cutting characteristics vary, depending on the types of minerals that make up the rock. Based on a series of tests, it is identified that volume energy of more than 3.06E + 13 mathrm{J}/{mathrm{m}}^{3} is required to fully cut intrusive rocks that have a thickness of 25 mm.
Highlights
Laser cutting of intrusive rocks, including granite, gabbro, and diorite, is carried out in order to assess the cut characteristics through geometrical measurements, such as kerf width, melting width, and penetration depth
Granite collected at Pocheon city (Gyeonggi-do) is the most common intrusive rock, with silicon dioxide comprising more than 68% of its weight[18]
When laser cutting was at 4.5 m/min, the influence of the number of passes on the penetration depth was studied by comparing the results of 1 pass and 4 passes under the same laser parameters
Summary
Laser cutting of intrusive rocks, including granite, gabbro, and diorite, is carried out in order to assess the cut characteristics through geometrical measurements, such as kerf width, melting width, and penetration depth. Depending on the silicon dioxide ( SiO2 ) content of the bulk rock composition, intrusive rocks can further be classified into three categories: granite, gabbro, and diorite These rocks include various minerals and are ideally suited for application in construction, civil engineering, landscaping, and monumental spheres because of their aesthetic appeal and high resistance, which allows them to withstand adverse weather conditions due to their high material stability and durability. The influence of a particle water-jet on the evolution of damage and the rock failure process were studied using smooth particle hydrodynamics (SPH) together with the finite element method (FEM)—that is, the combined SPH-FEM method This process cuts rocks more effectively in comparison to diamond cutting but has disadvantages, such as a high noise level, a high kerf taper angle, and a tendency to break the workpiece down during water-jet processing. LAM has been applied in a wide range of industry fields despite the fact that it has higher investment costs than conventional cutting[7,8,9,10,11]
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