CS257124B1 - A way of adjusting the packaging material of coated electrodes for welding - Google Patents

Abstract

The solution concerns a method of treating the coating material of coated electrodes for electric arc welding of steels by means of frequency oscillations. The coating material prepared for pressing onto a steel core is treated with vibration before pressing with an oscillation frequency in the range from 10 to 120 Hz for a period of 1 to 10 minutes. This achieves high resistance of the electrode coating to moisture.

Description

257124

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a method for treating an envelope mass of coated electrodes by welding an electric arc with frequency oscillations.

The welding electrode casing is made by molding the packaging material onto the electrode core. Packaging material is prepared by blending or mixing dry homogeneous mixtures of selected non-metallic powder powders such as limestone, fluorspar, rutile and metal, such as ferro-manganese, ferro-silicon, iron powder, and the like with a water-glass and binder to achieve plasticity. Conformity of kneaded material.

The coated electrodes thus produced usually have a tendency to become wet, exposed to ambient air. The capsule receives moisture, that is, water from the air if the relative humidity of the air is high. However, the wetted electrodes exhibit deteriorated technological and metallurgical properties, thus, for example, giving porous welds, having a large spatter during welding, feeding a large amount of hydrogen into the weld metal and the like.

Several methods of protection are used to counteract this affection. Thus, for example, substances for the preparation of packaging material are added with substances intended to prevent the ingress of water vapor from the air into the interior, or especially substances which reduce the ability of the dried water glass in the dried electrode to receive water are added to the water glass, or the finished electrodes are covered with a thin layer of protective coating, aiming at! to prevent the water vapor from accessing the surface of the package. Further, a method for storing the dried electrodes in hermetically sealed sheet-metal storage containers is known until they are consumed in the workplace.

While the aforementioned means provide some protection to the coated electrode from moisture contained in the air, but the use is associated with considerable disadvantages. Adding various materials to the blend to produce packaging material or waterglass results in a reduction in the plastic properties of the packaging material. Covering the finished electrodes with protective layers is a work-no.

According to the method of the invention, said non-advantages are largely eliminated. The essence of adjusting the packaging material of the coated electrodes for welding and welding of steels by electric arc is that the wrapping material is vibrationally processed by the oscillation frequency from 10 to 120 Hz before it is pressed in for 1 to 10 minutes. An advantage of the method of treating the packaging massed welding electrodes according to the invention is that a relatively long, high wetting resistance of the electrode shell is achieved, which represents a substantial improvement in the technological properties, and it is not necessary to use much more expensive electrode protection methods. . • The way of editing is explained in more detail in the following examples. Example 1 no. 1

The 440 MPa base electrode packet mass prepared by over-killing the homogeneous, dry potassium glass slide was placed in a 10 kg container. This canister was placed on a vibration table and fixed to it. Vibration was performed at 60 Hz and 8,000 duty cycles were performed, which took 2.2 minutes. The steel thus processed was then pressed into the steel core of the electrode used so far. To compare the properties, the packaging material of the same quality, prepared by the same kneading technology, was vibrated. After drying the electrodes at 200 ° C and 350 ° C for two hours, both electrodes were tested for wetting under the same conditions. The electrodes were placed in a humidifying chamber at 20 ° C and a relative humidity of the chamber of 84%. Even after 6 hours of the electrodes being tested in the wet chamber, the difference in wetting of the electrodes was found to be significant. The electrode made by pressing a non-vibrated packaging material showed a 1.35% wavelength while the same material processed according to the invention gave the package such high resistance to wetting that its wetness was only 0.45% by weight. 2 Next, the effects of vibration and vibration frequency on the same electrode coating mass as <in Example 1 were tested. The packaging material was vibrated at 120 Hz for 4.8 minutes after treatment with potassium water glass, whereby moisture was obtained mass 0.41% by weight. 3

The vibration of the same packing mass of example 1 at 10 Hz vibrated for 10 minutes. The moisture content of the coating mass was 0.49% by weight.

The way the packaging material is treated according to the invention can be used in the production of coated welding electrodes, especially for the manual arc welding of steels.

Claims (1)

257124 FRED MET A method of treating the wrapping of coated electrode for welding and surfacing with an electric arc, characterized in that the wrapping material undergoes a vibration frequency of from 10 to 120 Hz prior to pressing it for 1 to 10 minutes before being pressed.