Effect of laser engraving parameters on surface morphology and quality of low carbon steel

Hussain, Rudi Aktar Ali (2022) Effect of laser engraving parameters on surface morphology and quality of low carbon steel. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Laser engraving is a machining process that is using laser to engrave the material. In recent year, Master Oscillator Power Amplifier (MOPA) Fiber Laser have been introduced for laser engraving. This research objective is to use Master Oscilator Power Amplifier (MOPA) Fiber Laser Engrave Machine to conduct laser engraving and surface cleaning on Low Carbon Steel. This research is to study the surface morphology and quality after laser engraving process on Low Carbon Steel. The experiment utilises two sample which the first sample conducted laser engraving directly on low carbon steel surface while sample 2 perform surface cleaning by using laser cleaning method before laser engrave on the sample.The design is done using Adobe Illustrator to design the square boxes to represent different laser parameters then transfered to the Laser Engraving Machine software that is EzCAD software to complete the engraving . The influence of the important laser parameters such as laser power, laser speed and pulse frequency of the laser beam is studied in this research. The laser engraving process requires certain important parameters that is needed to complete the laser engraving process and to determine the best laser parameters needed to achieve the best quality of laser engravement on the low carbon steel surface. In order to identify the quality of the laser engrave on the surface of low carbon steel, the results of the laser engraving with the surface morphology and quality are analysed to determine the microstructure and surface roughness of the low carbon steel. The microstructure of the material is analysed through a Nikon Eclipse Lv100 to observe the microscopic structure on the laser engraved region. Plus, the surface roughness of the engraved boxes is analysed with Mitutoyo Surftest SJ-410 stylus profilometer to obtain the roughness value (Ra).

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