SU942336A1 - Welding electrode - Google Patents

Description

The invention relates to the field of welding, in particular to welding materials, namely to a welding electrode. A welding electrode is known, consisting of a high-alloyed steel rod and a coating containing the following components, weight. %: Marble31 Fluorspar27 Aluminum1.5 Ferrosilicon14 Manganese6.5 Ferrobor12 Domolit8 The disadvantage of this electrode is its low efficiency, poor processability in manufacturing and low welding and technological properties. The low efficiency of the electrodes is due to significant losses of boron due to burnout during the welding process due to its high affinity to oxygen, as well as due to stuck in the slag. To reduce the loss of boron due to fading, a significant amount of deoxidizing agents (aluminum, manganese) is introduced into the coating, which, however, is quite effective. The boron conversion factor is in the range of 0.3-0.4. The closest in composition is a C 2J welding electrode consisting of a high-alloyed rod and a coating containing the following components. wt.%: Cryolite Fluorspar Alumina Magnesite Molybdenum Manganese However, the known electrode does not fabricate sufficient welding and technological properties. The aim of the invention is to increase the welding-technological properties. The goal is achieved by the fact that in a pile electrode consisting of a highly insulated rod and a coating containing fluorspar, metal carbonate, rutile and chromium, the coating additionally contains pyrolusite and muscovite, and as a metal carbonate contains marble in the following ratio of components, wt.%: Marble5-7 Rutile18-22. Chrome1-10 Pyrolusite1-10 Muscovite4-6 Fluorspar Remaining The core contains the following components, wt%: Carbon0.02-0.12 Manganese 0.5-2 Silicon 2-3 Chrome 23-26 Nickel18-22 Bor0.5-0.8 IronEverything Else The combination of the 08H25N20C2P1 wire with the selected composition of the coating provides a weld during welding of the metal with an austenitic-boride structure, resistant to cracking and possessing the required heat resistance and heat resistance. The content of boron and silicon in the weld metal is 0.4-0.6 and 1.8-3.0%, respectively. The boron transition coefficient is 0.64-0.75. Increasing the boron conversion factor is achieved both by using boron-containing wire, which significantly reduces the contact surface of the liquid metal with slag and eliminates the possibility of boron getting stuck in the slag, and by reducing the oxidizing potential of the coating as a result of increased fluorspar content and limiting carbonate content (5 -7%). Introduction of 4-6% muscovite contributes to increasing the plasticity of the coating mass when pressing electrodes and, in combination with the selected ratio of the remaining slag-forming ingredients, provides high welding-technological characteristics of the electrodes. The absence of manganese in the coating prevents the reaction of its interaction with liquid glass, which contributes to an increase in the plasticity of the coating mass and eliminates swelling of the cover, i.e. technological properties of the electrodes are improved. The introduction of 18–22% rutile and 1–10% pyrolusite into the coating in combination with the selected ratio of the remaining slag-forming ingredients provides high welding technologies. the electrode properties (stable arcing, good formation of the weld metal, easy separation of the slag crust). The introduction of 1-10% chromium allows you to adjust the composition of the weld metal depending on the content

Table 1 423364 chromium in the welding wire to provide the required heat resistance of the weld metal. 5 Coating compositions (wt.%) Are given in table. 1. The coating weight ratio is 0.4,

Marble

Fluorite

Rutile

Muscovite

Chromium

Pyrolusite

To evaluate technological and advanced experimental variants of electrodes with a core-technological characteristic of wire of the brand

electrodes, and also service harak-3008H25N20S2P1 with a diameter of 3 mm G

weld metal fabrications are made (Table 2). The manufacture of experimental S5 electrodes on standard equipment is not difficult. Cutting mass, preserved after wet mixing7

52 18

4 10

9

Table 2 neither in plastic bags, remains plastic for 24 hours and is suitable for crimping. After fabrication, the electrodes are dried at a temperature of 24 hours and then calcined at a temperature of 2 hours. The swelling of the coating, both on dry electrodes and in the process of drying and calcining, does not occur. Multilayer claddings are performed and butt-welded cast steel.

Studies of welded joints show the absence of cracks in the weld metal and heat-affected zone. By heat resistance and heat resistance, the weld metal is not inferior to the base metal of steel 08Kh25N20S2L (Table 2).

The use of electrodes is advisable in the manufacture and repair of carburizing furnaces, parts of gas systems and arc equipment operating at temperatures of 8001000s.

Experimental verification of these electrodes shows that they provide high quality welds (no cracks and pores) and good welding properties. 6 08Х25Н20С2Л with a thickness of 30 mm. The tests carried out show that the claimed electrodes have better welding and technological properties than the known electrodes: greater arc stability, less spattering, easy separation of the slag crust. The boron conversion factor is 0.64-0.75 (Table 3). Table 3

Claims (2)

- 1. WELDING ELECTRODE, consisting of a high alloy steel rod and a coating containing fluorspar, metal carbonate, rutile and chromium, characterized in that, in order to improve welding and technological properties, the coating additionally contains pyrolusite and muscovite, and as metal carbonate contains marble in the following ratio of components, wt.%: Marble 5-7 Rutile18-22 Chrome1-10 Pyrolusite 1-10 Muscovite 4-6 Fluorspar Rest 2. The electrode according to claim ^, characterized in that the high-alloyed rod contains the following components, weight. %: Carbon Manganese Silicon Chrome Nickel Bor Iron 0.02-0.12 0.5-2 2-3 23-26 18-22 0.5-0.8 Else