Sometimes China Die Casting is acceptable

Porosity varies in severity. Sometimes China Die Casting is acceptable, but most often it’s best to limit it as much as possible.

The most direct way to control for porosity is to work with all of your partners to create an efficient process for die casting, while ensuring the material you’re working with is of a high quality. Process monitoring should focus on equipment maintenance and stability, which can help guarantee an even and adequate amount of pressure throughout the casting.

Gas porosity, which is the formation of air bubbles inside of a casting as it cools, can be avoided by melting the material in a vacuum or in an environment of low-solubility gases, including argon. This porosity occurs because liquids can naturally hold in dissolved gas. Sometimes this can be addressed by exposing the melted material to another gas — the two gases react and pull each other out of the liquid.

If oxide formation is the cause of your porosity, then your materials will also benefit from being properly degassed after melting or filtered before using the metal for making the casting.

Hot tears and hot spots are metallurgical defects that occur because of problems during cooling. If this occurs, you’ll first need to make sure your casting is properly being cooled in that local area of the part. If hot spots persist, you will need to adjust the cooling practices by either more die spray or adding more localized cooling channels to that problem area.

Addressing Defects HPDC Aluminum Casting.