| 摘要 |
A method of and an apparatus for marking metal objects, especially metal billets at high temperature, are disclosed. The marking will enable selective identification of the object in question. A marking head (3) is utilized, having at least one electrode (4) for providing character is built up in a matrix form on the object (1) by means of an electric arc process. The characters consist of matrix parts in the form of welded-on projections, in which case a consumable electrode is utilized, preferably in conjunction with the principles for gas metal arc welding, or alternatively of matrix parts in the form of recesses, in which case a non-consumable electrode is utilized, preferably in conjunction with the principles for plasma arc cutting. The marking head (3) preferably comprises a sequence of electrodes (4) which are activated selectively in conjunction with relative displacement between the marking head and the metal object (1) to provide the desired character matrix parts. By sensing that necessary electrode current has been consumed in conjunction with an activation of an electrode, a confirmation can be obtained that the desired character matrix part has actually been provided. |
