Preliminary Numerical Analysis for the Role of Speed Onto Laser Technological Processes

Abstract

<jats:p>Studying the impact of speed on a number of laser processes such as marking, engraving, cutting, welding and others is crucial for the optimization of these technological processes. The processing speed, along with the frequency of laser pulses and their duration, also determines the time of action in the processing area and hence the absorbed quantity of electromagnetic energy. Based on numerical experiments with specialized software TEMPERATURFELD3D, the report analyzes the temperature variation in the processing area as a function of speed. The researches were analyzed for processing with two types of lasers emitting in the visible and infrared areas of the electromagnetic spectrum and two types of steels (tool and structural). From the course of the obtained temperature fields the dependence of temperature on the speed at two power densities was obtained. The obtained results help to make a preliminary assessment the speed work intervals for the processes as laser marking, laser engraving, laser cutting, laser welding and others. In this way, it is assisted in building an optimal concept for the passing of a particular technological process in function of the laser source, the material and the type of the technological operation.</jats:p>

Temperature Measurement With Photodiode in Different Operating Modes

“…All this leads to an increase in the collection coefficient of non-core charge carriers. As a consequence, there is an increase in the maximum of the spectral sensitivity of the photodiode and its displacement in the long-wavelength region [9], [16]. These properties of the photodiode can be used in a pyrometer in order to simplify its design and increase the accuracy and sensitivity of pyrometric measurements [11], [13].…”

Features of Color Laser Marking on Metals

“…[6]. Dusser and his team demonstrated the achievement of material modifications using ultrafast laser pulses by creating polarization-dependent structures that can create specific color designs [7]. Color laser marking technology for coloring metals has also been researched at Gorny's research center.…”

Marking and Cutting of Non-metallic Products with CO2 Laser

“…Some of the information (alphanumeric, graphic or coded) is applied mainly to metal products, but in recent decades it is already used in nonmetallic materialsglass, plexiglass, textiles, wood, organic and inorganic compounds and many others, such as the territory of these materials expands with each passing year. Laser marking and laser cutting technology is now used in textile processing, with the cost of carrying out specific activities being significantly lower [7,8]. Increasingly, we also find laser-made inscriptions on organic and inorganic materials, and it is impossible to replace and edit them, unlike the methods used so far with ink application of information.…”