schweisselektrode and procedures for electric lichtbogenschweissen

摘要

An electrode for electric arc welding in air containing alkali metal composites which comprise an alkali metal oxide in combination with one or more metal compounds of acidic or amphoteric nature, preferably iron oxide, manganese oxide, aluminum oxide or silicon dioxide. The alkali metal composite is less hygroscopic than the alkali metal compound it contains and is capable of being reduced to elemental alkali metal in the welding arc by reducing agents contained in the electrode. The alkali metal composite is provided in sufficient quantity so that the alkali metal obtained therefrom reduces the nitrogen content of the weld metal sufficiently to suppress nitrogen boil in the weld metal. Certain metal oxides and fluorides, preferably oxides of silicon, calcium, or aluminum and fluorides of calcium, barium, lithium or sodium are moisture barrier materials and may be included in the alkali metal composite to further enhance its resistance to absorption of moisture from the air.