Abstract
This paper describes the design of a device for marking metal items by tracing alphanumeric and
graphical symbols on their surface by the method of electroerosion ~a plasma marker! and
an algorithm for operating it. A low-power air-fed plasma torch of original design attached to a
compact two-coordinate table is used in the device as the writing module. Results are
given for an investigation of the parameters of the air-fed plasma torch in the 2 – 10-A current
range. It is shown that the plasma torchÂ’s best operating regime for marking steel items
uses a current of 2.5– 3.0 A and an air flow of 7–8 L/min.
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