HU192947B - Welding electrode - Google Patents

Abstract

The invention relates to welding techniques, in particular to welding materials, namely welding electrodes. The object of the invention is to improve the welding technology properties of the welding electrode. The above goal is achieved by coating the coating material with pyroluzite and muskovite as well as marble as metal carbonate in the following composition: marble 5-7% rutile 18-22% chromium 1-10% pyroluzite 1-10% % Muscovite 4-6% by weight of flux 45-71% by weight. 192 947

Description

BACKGROUND OF THE INVENTION The invention relates to welding techniques, more particularly to welding materials, namely, welding electrodes.

It is known to have a welding electrode consisting of a high-alloy steel rod and a 5-coating coating,

filled by weight: ferroboron 12% dolomite 8% marble 31% cand 27% aluminum 1.5% FeSi 14% manganese 6.5% The electrode above disadvantages;

because it is not economical enough, its production is difficult and its welding technology is poor.

The inadequate economy of the above welding electrode is caused by the significant loss of boron 20, which is due to the fact that part of the boron during the welding process is burned due to its high affinity for oxygen and partly into the slag.

Significant amounts of deoxidizing agents (aluminum, manganese) are incorporated into the coating to reduce the loss of boron due to burnout, but the above solution is not effective enough.

The boron yield is in the range of 0.3-0.4. 30

In terms of composition, the closest known solution is disclosed in U.S. Patent No. 182,814. a welding electrode described in a Soviet copyright certificate, consisting of a high-alloy rod and a coating containing by weight 35% of the following:

chrysolite 6-10 can also be prevented. cand 35-40 The amount of the invention is other rutile 5-10 ski-forming ingredients in addition to 18-22% rutile clay 8-12 40 and providing 1-10% pyrrolusite magnesite 7-12 electrodes with excellent welding technology proprietary molybdenum 15-20 features (stable arc light, weld metals, manganese 6-10 responsible formation, easy removal of slag crust chromium 2-6. volíthatósága). However, this welding electrode 45 Provides 1-10% chromium in the weld satisfactory owner of welding equipment depending on the chromium content of the weld

characteristics associated.

It is therefore an object of the present invention to improve the welding technology properties of welding electrodes. 50

The object is achieved by providing a welding electrode consisting of a high-alloyed rod and a coating comprising a plume, a crown bonnet, rutile and chromium, the coating being supplemented with 55 pyrolucite and muscovite, the coating composition by weight is as follows:

marble 5-7 rutile 18-22 chromium 1-10 pyrolusite 1-10 muBzkovit 4-6 cand 45-71.

bi:

The composition of the rod in% by weight of base carbon 0.02-0.12 manganese 0.5 - 2 silicon 2-3 chromium 23 -26 nickel 18 -22 boron 0.5 - 0.8 iron 46.08-55.98.

Combined with the above composition in combination with the coating of the present invention, the welding of the metals results in an austenitic-boride weld which is resistant to crack formation and exhibits adequate heat resistance and heat resistance. The boron and silicon content of the welded metal is 0.4-0.6 and 1.8-3.0%, respectively. The yield of boron is 0.6-0.75. Increasing the yield of boron by using a boron-containing rod, which significantly reduces the contact surface of the liquid metal with the slag and does not trap boron in the slag, and by reducing the oxidation potential of the coating, 7%).

Muscovite content of 4-6% ensures greater plasticity of the coating mass during compression of the electrode during production of the electrode and, together with other desired amount of shape forming components, good welding technology characteristics of the electrode.

Since the coating does not contain manganese, the reaction between the manganese and the liquid water glass is inhibited, thereby increasing the plasticity of the coating mass and controlling the composition of the metals to be blistered and consequently providing the desired heat resistance of the welding metals.

To study the technological and welding characteristics of the electrodes and the application properties of the weld metals, the core of the test electrodes was made of 0.3 mm diameter wire, the chemical composition of which is shown in Table 1.

Tables 1, at

Chemical composition of experimental electrode wire

Wire Wire composition (% by weight) Component Electrode Identification Number Parts 1. 2. 3.

- coal

0:02

0:08

0:12

Wire Wire composition (% by weight) Identification number of component electrodes

parts First Second Third manganese 1.5 0.5 2.0 silicon 3.0 2.6 2.0 chromium 24.5 26.0 23.0 nickel 20.0 22.0 18.0 Skin 0.8 0.5 0.7 iron 50.18 48.32 54.18 The composition of the coating % By weight the 2. Table. The coating súlykoefficiense 0.4. Table 2 Composition of electrode coatings Coating Coating composition (% by weight) creative electrode identification number parts First Second Third marble 5 6 7 cand 60 58 52 rutile 22 20 18 muscovite 6 5 4 chromium 6 1 10 pyrolusite 1 10 9

The preparation of the above experimental electrodes according to methods known per se is not a problem. The coating mass, which is stored as a wet mixture in a polyethylene bag, retains the molding unit within 24 hours.

After forming, the electrodes are dried at 20 ° C for up to 24 hours and then annealed at 350 ° C for up to 2 hours.

No blistering of the coating was observed either at the wet electrode or during drying or heating.

Multi-wire welding is performed and 30 mm thick cast steel is blunt-welded. As a result of the experiments, it has been found that the electrodes of the present invention have better welding technology properties than the known electrodes, such as greater arc stability, less spattering and easier removal of the slag layer. The yield of boron is 0.64-0.75. The experimental results are summarized in Table 3.

Table 3

Welding characteristics of the electrodes of the invention

Electrode identification number, name Bórkiho- making will (%) Temperature resistance at 900 'C (200 hours, hours / m ^! ) Thermal strength at 900 ° C (100 hours, kg / mm ² ) 1 0.64 0.0235 3 2 0.75 0.0220 3 3 0.68 0.0228 3 known 0:33 0.0226 3

During the examination of the welded joints, no cracks were found either in the weld metal or in the weld zone. The heat resistance and heat resistance of the weld metal are not impaired compared to the parent metal (Table 3).

The welding electrode of the present invention is suitably used in construction, for the repair of cement-resistant furnaces, gas-pipe system components and other fixtures exposed to operating temperatures of 800-1000 ° C.

Industrial testing of the welding electrode of the present invention has shown that it provides high quality welding without tip cracks and pores and has good welding technology properties.

Claims (1)

Patent Claim Point Highly alloyed welding electrode, preferably 0.02-0.12 wt% carbon, 0.5-2 wt% manganese, 2-3 wt% silicon, 23-26 wt% chromium, 18-22 wt% nickel, 0.5- 0.8 It consists of a steel core containing 45% by weight of leather, 46.08 to 55.98% by weight of iron, and a coating containing folate, metallocalcarbonate, rutile and chromium, characterized by the addition of bevo and containing marble as metal carbonate in the following composition: marble 5-7 crowd% rutile 18-22 tőineg% chromium 1-10 crowd% pyrolusite 1-10 crowd% muscovite 4-6 crowd% cand 45-71 crowd%. Without drawing The Director of Economic and Legal Publishing is responsible for the publication