The Change of Contrast Is Investigation of 75 Steel Samples Laser Marked With Different Modes

Abstract

The quality of the marked surfaces changes the optical characteristics. The aim of the study is to optimize the contrast in laser marking of Steel 75. The influence of the step in the raster marking and the influence of the repetition frequency of the pulses on the reflection coefficient were analysed. The experimental investigations of the reflectance were carried out using a spectrophotometer. For the marked samples, it was found that when directing electromagnetic radiation with a wavelength in the studied range, there are areas with absorption and reflection of light. The reflectance is plotted as a function of marking step and laser frequency for the marked Steel 75 samples.

Investigation of Laser Marking on Chromium-Nickel Samples

“…What is characteristic of this study is that up to 5 Watts the change is linear and smoothly increasing, and then there is a sharp change and the larger the step, the more SQ decreases. For larger powers, no measurement was made because the results obtained have no practical significance [5], [14], [15], [16].…”

“…A dual-axis galvanometer scanning system (hurry SCAN II 14 digital scanning head from SCANLAB corp.) was installed to move along the X and Y axes. A focusing lens with a focal distance 100 mm [10], [11], [12]. Additional horizontal movements and vertical movements can be performed using a multi-axis linear motor coordinate stage, which allows the extension of the working space to 250×250 mm.…”

Multi-Criteria Research of Geometric, Mechanical, Energetic Andtemporal Indicators Depending on Laser Hardening Parameters

“…Tribological issues, and in particular those related to wear resistance, need to be identified before the process of designing treatment modes when it comes to thermal treatment. Similar research is described in the monograph [12], [13], where the relationship between the goal parameters and the technological factors of the modes for processing are defined.…”