1. Powder-related factors

Powder quality: If the metal powder contains more impurities, these impurities may decompose and produce gas in the printing process, thus forming pores.

Powder adsorption gas: Metal powder has a large specific surface area, it is easy to adsorb gases in the air, such as nitrogen, oxygen and so on.

2.The printing process parameters

Energy input: The laser power is too high or too low may lead to porosity generation

Scanning strategy: The scanning path of the irrational planning will affect the solidification of the molten pool order and gas discharge.

1. The environmental factors of the equipment

Protective gas: If the flow of protective gas during the printing process is insufficient or insufficient purity, the surrounding air will be mixed into the printing area.

Print room environment: The cleanliness of the print room is also very important.

2. The material characteristics of factors: Some metal materials itself in the solidification process has a high degree of gas solubility.