What type of water is used as a dielectric fluid for wire EDM machines?

In wire electrical discharge machining (EDM), the dielectric fluid plays a crucial role in ensuring the proper functioning of the system. Deionized water is the correct choice for a dielectric fluid because it has had most of its ionized contaminants removed through a process of ion exchange. This results in a high level of purity, which is essential for maintaining the electrical characteristics needed for the machining process.

Using deionized water prevents the formation of conductive particles and minimizes the risk of short circuits during the EDM operation. It also helps enhance the precision and surface finish of the machined parts by providing better flushing of the eroded material. Other types of water, such as distilled, tap, or spring water, may contain minerals or ions that could negatively impact the machine's performance, create conductivity issues, or lead to unwanted residues. Therefore, deionized water is specifically chosen for its properties that support optimal wire EDM machining operations.