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Device for plasma marking of metal items

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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 torch’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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