Iron and steel industry is an important fundamental of national economic development, with the expansion of the scale of development of the iron and steel industry, steel and its derivatives industry competition is becoming more and more intense, the vast majority of enterprises will focus on turning to reduce consumption, reduce costs, increase varieties, improve the quality of production as well as the green environmental protection and other aspects. Laser cleaning as a new type of green cleaning, its diversity and adaptability compared to the traditional cleaning process in the application of steel has unparalleled advantages.
Diversity of laser cleaning
Laser cleaning using high-energy pulsed laser beam irradiation of the surface of the workpiece, so that the substrate material with a different surface of the foreign matter (and the substrate material is different from the material) to occur instantaneous evaporation or expansion of the stripping, in the removal of foreign matter at the same time, but also protect the substrate from wear and tear. Now more applications include steel surface laser rust removal, oil removal, paint removal, removal of coatings, removal of oxidized layers.
Adaptability of laser cleaning
Laser cleaning is applicable to a variety of materials, steel, aluminum, non-ferrous metals, ceramic insulators, glass, stone, etc. In particular, it is most widely used on steel and its derivatives, especially in industrial applications.
Laser cleaning before plate and strip welding
Laser cleaning machine can be integrated with CNC machine tools or robots, the implementation of remote control cleaning, can realize the automation of the equipment, the formation of product line operation, intelligent operation. Production line laser cleaning in the steel mill is mainly used for strip surface in addition to the coating, as the last process before welding. Pre-welding laser cleaning can replace the traditional welding method of grinding and sand blasting process, while reducing the formation of porosity and defects in the weld to ensure the quality of the weld.
Pre-welding laser cleaning
Production line laser cleaning is also used for post-welding laser cleaning. Welding process heat treatment will lead to oxidation at the interface, the formation of oxide layer, timely cleaning of post-welding oxide, slag skin, spatter, etc., is conducive to the observation of post-welding welding defects and probing, and timely detection of surface defects and be eliminated, repair, to ensure that the surface quality of the product. Laser cleaning after welding can replace the dangerous chemical cleaning methods, and use the same production line immediately after welding to clean stainless steel, effectively improve production efficiency.
Profile steel refurbishment anti-corrosion treatment
Applying an anti-corrosion covering on the surface of the profile steel pipe is the most effective way to prevent corrosion of the steel structure. Before applying the first primer, it is necessary to remove the dust, oil stains and other impurities on the surface, and thoroughly remove the surface rust spots, residual oxidized skin, old paint and residues, to ensure that the surface is cleaned up, it should be coated immediately, so as to avoid secondary rust. Laser cleaning is powerful, not only to clean dust, oil, rust, oxidized skin, paint, etc., but also to precisely locate and target a certain part of the cleaning, and does not damage the substrate material.
Steel Structure Renovation
Steel structure building is a new type of building system, with the increasing maturity of the use of technology, it gradually becomes the mainstream construction process, mainly used in factories, gymnasiums, railway stations, TV towers, ironmaking blast furnaces, derricks and so on. Coating the surface of steel pipe with anticorrosive covering layer is the most effective way to prevent corrosion of steel structure. Even though the steel structure has been treated with anticorrosion treatment at the early stage of construction, corrosion can occur due to the environment, construction factors and other reasons that cause the surface coating to fall off as well as oxidize. Therefore, regular renovation of the corroded part can effectively control its adverse effects on the whole building. First of all, it is necessary to clean off the foreign matter in the corroded part, including paint, rust, oxidized layer, etc., which will reduce the adhesion between the corrosion-resistant layer and the steel structure, leading to cracking or peeling off of the corrosion-resistant layer. Laser cleaning can accurately clean the surface paint, rust, oxidized layer, etc. by pinpointing a certain part, and the resulting pollutant particles can be collected as waste to avoid environmental pollution.
Renovation and maintenance of metal parts
The cleaning of metal parts should be very careful, first of all, to ensure that the metal parts will not be corroded, and secondly, the cleaning process will not produce residues, including dirt and unfavorable to the subsequent processing of the cover layer. Laser cleaning is "dry" cleaning, and can only be cleaned with the substrate material different from the surface coating, will not damage the substrate. The cleaned metal parts can go directly to the next production process.
Laser descaling of automotive parts
The pulsed laser used in the laser cleaning machine has a long service life, usually up to 100,000 hours, stable quality and good reliability. No consumption of consumables in the process of use, low operating costs, and later only need to clean or replace the lens on a regular basis, low maintenance costs, close to maintenance-free. It is widely used in steel and derivative industries.
