The purity of the assist gas is extremely important – impurities in the assist gas can create extensive damage to the cutting head, resulting in downtime and expensive repairs. Cutting head failures are the leading cause of machine downtime. Impurities in the assist gas (such as oil, solder flux residue, Teflon tape, and other impurities from the gas source, or the installation of the gas lines, end up on the cover glass (cover slide) in the cutting head. Here, they create hot spots on the cover glass and initially cause poor cut quality – and quickly lead to additional expensive damage if the cover glass breaks. For this reason, the purity required for laser assist gas should be higher than standard compressed gas cylinders.
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