Purpose of the electrode and its electrode characteristics is an important link in the technology of electric arc welding it is intended to supply electrical current to the subject of welding. Today there are many types and brands welding electrodes, each with its narrow specialization. The electrodes must meet the following conditions: constant flow of arc burning, the formation of high-quality weld; metal in the weld should be defined chemical composition; rod electrode and the coating melt evenly; welding with high efficiency at the lowest spraying metal electrode; obtained by welding slag is easily separated; saving technological and physical-chemical characteristics during a certain period (storage); low toxicity in the production and during welding operations. How are the electrodes for their manufacture conducting electric current is used welding wire or rods of metal, the chemical composition of which determines the quality of the electrodes. The electrodes may consist of a metal rod (wire), such welding electrodes are called uncovered. If the rod electrode is covered with a special composition, designed to improve the quality of welding electrodes is a cover. Coating is applied in several types: sour basic, rutile, cellulosic and blended. According to the purpose coating is divided into two types: defensive (tolstopokrytye electrodes) and ionizing (tonkopokrytye electrodes). To better understand the differences between these types of coatings, it should be noted that the quality of welding electrodes coated with ionizing inferior welding electrodes with protective coating, the first type of coating can not protect the weld from the nitration and oxidation.