The metal oxides of marine steel affect, the quality of welding seriously. The laser is used to remove metal oxides, and improve the surface properties such as interfacial bonding strength. However, the important part of laser removal of metal oxides is mechanism research. In this paper, in order to reveal the physical mechanism of laser removal of metal oxides, laser-induced plasma spectroscopy was used to collect the spectral information of laser removal of oxides from marine steel(Q235B). Temperature rise model of laser heating was used to analyze the spectral intensity of metal substrate and oxide. The intensity and electron density of the spectrum were studied, and the mechanism of laser removal was discussed.
The surface pretreatment of marine steel corroded by seawater is crucial procedure for the marine transportation and shipbuilding industry. This paper presents the laser cleaning of the corrosion products on marine steel using the pulsed fiber laser. The surface morphology as well as chemical composition of corrosion surface is compared with the cleaned surface. The Laser induced breakdown spectroscopy (LIBS) technology is used to guide and control the laser cleaning process.
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