Influencing Factors of Critical Power Density of Titanium Alloy by Nd-YAG Laser Welding
Laser welding is becoming increasingly popular among the welding process, especially in the metal industry.. With the advantages of high efficiency, low energy consumption and convenient operation, laser welding has been widely used in the production industry. The strength and quality of a welded joint also depends on the quality of its weld. Therefore, it is important to determine the critical power density of the material in order to get a good weld joint. In this paper, the effect of Nd-YAG laser welding on the critical power density of titanium alloy will be discussed.
The critical power density of a material refers to the maximum power density that can be absorbed by the material without causing overheating and melting. To achieve the best welding parameters, it is important to know the critical power density of the material. Nd-YAG laser welding is widely used in various industries because of its characteristics such as high power density, high peak power and long focal length allowing it to penetrate deep into the material. Therefore, it is essential to determine the critical power density of titanium alloy by Nd-YAG laser welding in order to get the optimal results.
A study by Chen et al. (2020) was conducted to investigate the effect of Nd-YAG laser welding on the critical power density of titanium alloy. In the experiment, they used an un-stabilized Nd-YAG laser welding machine with the welding parameters including power ranging from 0.5kW to 2kW, pulse frequency from 30Hz to 50Hz and pulse duration from 0.2ms to 2ms. The results showed that the welding process was successful up to a certain power density and beyond that it had little effect. The critical power density of the material was determined to be 8.9X106 W/m2.
The authors concluded that the Nd-YAG laser welding has a significant effect on the critical power density of titanium alloy and thus should be taken into consideration when designing the welding parameters.
The critical power density of titanium alloy by Nd-YAG laser welding is influenced by several factors. One of the factors that can affect the critical power density is the laser power. A higher laser power will result in higher power density and thus it will increase the critical power density. Thus, it is important to adjust the laser power according to the requirement. Moreover, the pulse frequency and the pulse duration also have a great influence on the critical power density of the material. A higher pulse frequency and a longer pulse duration will result in higher power density and thus it will increase the critical power density.
Apart from these factors, the material properties of the titanium alloy also play an important role in determining the critical power density of the material. The microstructure and chemistry of the material, such as grain structure, element composition and volume fraction of alloy, can all affect the absorption of laser energy and consequently the critical power density. Lastly, the laser focusing angle can also affect the critical power density since a correct beam angle can lead to less power loss.
In summary, it is important to determine the critical power density of the material before Nd-YAG laser welding in order to achieve the optimal welding parameters. The critical power density of titanium alloy by Nd-YAG laser welding is influenced by several factors such as laser power, pulse frequency and pulse duration, material properties of the titanium alloy and laser focusing angle. It is essential to understand these factors in order to get the best welding results.
