Abstract
As a common mechanical material for mining machinery, Q345 is prone to oxidation due to the moist working environment. At present, laser cleaning is often used to remove rust oxides from the substrate. The pollutant of mining machinery is comprised of a heavy oxide layer and organic ingredients, which are difficult to remove and require high energy per pulse. However, excessive energy is capable of easily destroying surface integrity, such as increasing surface roughness (Ra), generating ablative pits, oxidizing, decreasing microhardness (HV), and decreasing corrosion resistance. Therefore, this paper focused on investigating the surface integrity of mining parts under different laser powers, repetition rates and overlapping rates of the laser spots. The results showed that the surface integrity of the samples gradually improved as the energy per pulse and overlapping rates increased. However, excessive energy caused a negative effect on surface integrity. Based on the comprehensive analysis, optimal parameters were obtained when the power was 280 W, the repetition rate was 10 kHz (pulse duration 84 ns), and the overlapping rate of the laser spot was 70%. This work can provide theoretical guidance for the laser cleaning of mining machinery.
Highlights
As an important part of the manufacturing industry, there is a huge annual demand and production volume of mining machinery worldwide
The power and repetition rate both determine the energy per pulse, while the overlapping rates of the laser spot are related to the cleaning rate
The power and repetition rate both determine the energy per pulse, the of the laser spot are to related to the Surface roughness is not onlywhile related to overlapping the efficiencyrates of laser cleaning, and the coating cleaning rate
Summary
As an important part of the manufacturing industry, there is a huge annual demand and production volume of mining machinery worldwide. Considering that Q345 steel has high strength and hardness, good wear resistance, and thermal conductivity, it is widely used in mining machinery parts. The working environment in the mining field is harsh, and the steel reacts electrochemically with oxygen to form rusty oxides, which greatly reduces the life and performance of the parts and causes huge economic losses. Traditional cleaning technology in the industrial field, e.g., high-pressure water jet technology, shot blasting and chemical cleaning, causes great damage to the surface of the sample, but is contrary to the national environmental protection and green cleaning requirements [1,2]. Laser cleaning meets the needs of industrial development and is gradually replacing traditional industrial cleaning technology due to its non-contact cleaning, precision, high adaptability, and eco-friendliness
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