Engraving

In the past, as well as today, people looked for ways how to make use of that what the nature offered. The knowledge how to gain, process and use metals, up today belongs to the most important skills. Names of the first known metals, bronze and iron, had given names to the two important historic epochs. The processing of metals can not be done without heating. To the classical methods, fire, gas flame, electric current and electric arc, the new science added two other methods, the laser and electron beams. The technological applications of the latest we shall pursued in the following paper.