PL9991B1 - Electrode for electric welding by means of a light arc. - Google Patents

Description

Enveloping the refractory coating of electric welding electrodes is already known. Experience has shown that the flame resistance of the electrode coating does not need to be as perfect as previously believed. Namely, it was believed that the coating must have about the same refractoriness or the same melting point as a small metal bar. It shows, however, that this notion is not entirely correct and that it is generally sufficient if the mixture surrounding the electrode withstands a temperature of about 1000 ° C. The operation of the electrode depends on the energized circulation of air around the light arc, as a result of which the coating of the electrode cools. This makes it possible to use relatively thin coatings with a lower melting point. But the electrodes could be used in a variety of working positions, namely from bottom to top, horizontally or from above, there is no need to change coating thickness. Instead, its refractoriness may be adapted to the type of work. The electrode coating should be mechanically strong enough to withstand manipulations that are not always carried out with too careful care. This is achieved with the cost of reducing the refractoriness as well as the previously required porosity. As the main components of the coating material, which has the required fire resistance, it is possible to use luka, chrysotile, chrysolite or derivatives of these materials, or a mixture of mechanical components. In order to obtain the required refractoriness of the coating, treat the mentioned materials with any known binder, such as sodium or potassium silicate, glucose, dextrin, etc. When making the electrodes, on the one hand, the chemical properties of the metal subject to fusion must be preserved electrodes, on the other hand, to give it some new properties. For this purpose, carbon is added to the coating material in such a form that, under the influence of the luminous arc during welding, it reacts at a temperature not higher than the melting point of the electrode coating or the alloys added. This carbon is used in such an amount that the alloy materials can penetrate into the welded material, and possibly the decaying electrode carbon is replaced with new carbon, or even that the amount of carbon in the molten metal is slightly increased. metal of the electrode, or even increase the content of individual components, or weld these or other alloys with the electrode material, the coating material is added in an appropriate amount and form (e.g. in the form of a powder) suitable for this purpose alloys or combinations thereof which, on reduction, give the intended alloy constituents. These include acid, oxygen or metalloid metal compounds. Finally, a strong refining agent is required to remove from the molten metal which may still be present in it; gases and free oxides. For this purpose, fluorine compounds have proven to be particularly advantageous, namely the combination of fluorine with aluminum, calcium, magnesium, etc. It is best to add binder-forming materials to the fluorine compounds in order to advantageously separate them in the bag. When producing the electrodes, it is best to proceed in such a way that the metal bar is immediately surrounded by a reducing, alloying and refining material using a suitable binder, and then the main materials are applied: slate, chrysolite, and hence also using a suitable means binding. PL PL

Claims (4)

1. Patent claims. 1. Electrode for electric welding by means of a light arc, made of a metal core surrounded by a coating, characterized by the fact that the coating has a refractoriness lower than that of the metal core and is mainly made of materials such as slate, chrysolite, chrysolite As many or a mixture of two or more of them, or of derivatives of these materials, or of a mixture of mechanical components contained in these materials, with the addition of suitable reducing agents, alloying materials and refining agents to these materials. form, as well as any known binder. 2. The electrode according to claim 1, the significant point is that the reducing agent is carbon in such a form that, under the influence of the light arc, it reacts at a temperature no higher than the melting point of the coating or of the added alloys. 3. The electrode according to claim 1, the material is that acidic, oxygen-containing or metalloid metal compounds are used in suitable form (eg in powder form) as the alloying materials. 4. The electrode according to claim 1, it is noted that fluorinated compounds or similar materials are used as refining agents in appropriate form and quantity. - 2 - 5, Method of making electrodes according to claims The method is characterized by first applying the reducing agents, alloying materials and refining agents with suitable binders directly to the metal core, and then using a suitable binder mentioned in claim 1. 1 main materials. Oscar Kjellberg. Deputy: M. Skrzypkowski, patent attorney. Duke L. Boguslawski, Warsaw. PL PL