In addition, the splashing on the surface of the solidified layer will affect the next layer of powder, resulting in the next layer of powder being uneven and uneven, and even damaging the scraper. Physical process of interaction between laser molten pool and laser beam In order to keep the metal powder bed from being contaminated by spatter, a high-speed protective gas flow can be used to remove the spatter. However,titanium tubing price, excessive airflow will affect the surface quality of the powder layer, and how to optimize the airflow technology has become the direction of manufacturers'continuous efforts. 2. Spheroidization Expand the full text Spheroidization is a unique metallurgical defect in the manufacturing process of metal-based powder bed. Spheroidization occurs when the liquid metal solidifies into a spherical shape under the action of surface tension. If the laser beam energy density is too high or too low, it will lead to this phenomenon. If the energy is too low, the metal powder will not be completely melted, which will lead to spheroidization. If the energy is too high, the liquid metal will splash on the unmelted metal powder, which will also lead to spheroidization. Spheroidization will affect the quality of the next layer of powder,titanium bar grade 5, affect the surface quality of components, and also lead to defects such as poor fusion and slag inclusion. Further, spheroidization reduces the tensile strength and fatigue resistance of the member. To reduce and avoid spheroidization, it is necessary to optimize the printing process and find the optimal parameter combination. Defects in 3D printed Ti6Al4V alloy and examples of their existence as fatigue cracks 3. Air Holes Porosity is the main defect type of SLM components, and it is one of the defects that have the greatest impact on the mechanical properties of SLM components, and it is also one of the focuses of industry and academia. In the process of SLM, the rapid melting and solidification of the material and the violent fluctuation of the molten pool will lead to the formation of pores. The size, number, morphology and location of the pores have an important impact on the mechanical properties of the component. The higher porosity will shorten the fatigue life of the molded parts, and the pores near the surface have a greater impact on the fatigue properties of the molded parts than those at other locations. According to the formation mechanism of stomata, it can be divided into raw material-related stomata and laser-induced stomata. The process of pore formation is very complex and closely related to the process parameters. Reasonable printing process and uninterrupted process optimization for material use times are still important conditions to avoid pores. 4. Surface quality With the development of SLM technology, the types of printable materials are more and more abundant, ti6al4v ,Titanium welding pipe, and the mechanical properties of components have been greatly improved, but the relatively poor surface quality is still one of the main obstacles limiting the development and industrial application of SLM. Powder spreading is the key step of SLM manufacturing, the quality of the powder layer is directly related to the absorption of the material to the laser, the thickness of the powder layer will affect the stability of the molten pool, too thick powder layer will cause defects such as lack of fusion, pores and so on,titanium bar gr5, too thin powder layer will reduce the manufacturing efficiency, therefore, strictly controlling the quality of powder spreading is of great significance to improve the quality of SLM components. Return to Sohu to see more Responsible Editor:. yunchtitanium.com