SU725854A1 - Electrode coating composition - Google Patents

Description

The invention relates to welding, in particular, to the composition of an electrode coating used mainly for welding low-carbon and low-alloyed steels.

There are various compositions of electrode coatings, such as coating d, containing the following components, wt.%:

Rutile

44.5 4.75

Ferrom arg anec 5.33

Ferrotitanium

Kaolin. 12.85

Quartz 2.75 2.96

Wood flour 21.5

Dolomite

Dextrin Oh, 99

However, when welding with this electrode coating, the weld metal is prone to cracking.

The closest in composition to the proposed is electrode coating 2, containing the following components, wt.%:

4O-5O

Rutile 15-18 Marble Talc. 7-10 Kaolin 3-5 1О-15

Ferromanganese Wood flour 1-1.5

The weld metal when using this electrode when welding low-carbon steel with a saturation layer of sulfur to O, O6-0, O9% has an increased tendency to hot cracks, poor weld formation when welding on a vertical plane, and low productivity.

The purpose of the present invention is to create electrons that provide high-quality welds when welding steels with a saturation surface layer with a sulfur content from O, O to 0, O9%, and an increase in the technological ability of the electrode.

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In order to reduce the tendency of the weld metal to crack, crack and increase the electrode's processability, the coating composition additionally contains ferromolybdep and silicocalcium, with the following ratios of components, wt.%: Marble 15-18 Talc, Kaolin Manganese Ferromolybdenum Silicocalcium 3-3.5 2.5 -3 Rutile Wood Flour Else The carbon core is low-grade wire, doped with margarite, up to 1.8-2%. The number of alloying elements in jiOKpbiTHH is calculated depending on the oir diameter of the rod used, taking into account the transition coefficients eyyo (LeITbv on the coating in the weld metal. In addition, the main requirement for the calculation of the coating is the content of manganese in the deposited metal within 5 5% The use of high-margandic wire and the introduction of metallic manganese makes it possible to eliminate ferromargans in the coating, which increases the technological efficiency of the coating production. manganese wire is higher than that of the coating. The weld metal is midday when welding low-carbon steel with sulfur content in the surface layer to a depth of 0.8-1.0 mm to O, O-O, O9 with electrodes with a surface s and coating , has the following composition, O, 8-O, 10 Carbon 3.1-4.6 Manganese 0.5-O, 83 Silicon 0.032-O, O35 Phosphorus 0.029-0.035 Followed Molybdenum Remaining Iron The structure of the weld metal is a carbide eutectic with the inclusion of manganese sulfides. Molybdenum grinds the structure of the weld metal and reduces the structure of cement-type carbides, instead of which molybdenum carbide MoC and (Mo) C is formed, as well as carbide eutectic. The incorporation of silicocalcium into the coating reduces the quality of the welding aerosol and manganese compounds released during welding. To obtain an electrode, three mixtures of components are prepared. The composition of the mixtures are given in table. 1 .. Table Ramor Kaolin Manganese Ferromolybdenum Silikokaltsy Wood 3.5 2.5 Electrode coating is applied by formulation. As a binder material in the manufacture of the coating, the ISPOL® is a liquid potassium-sodium glass {modulus 2.7-2.9j density 1.48-1.5 kg / cm). The chemical composition of the weld metal, welded by electrodes with the coatings listed in Table. 1, is given in table. 2. Table2

This electrode is used to produce samples that mimic the actual compound most often encountered in repair practice. The metal is taken on the apparatuses working under the conditions of contact with sulfur gases for at least 2 petres the sulfur content in the surface layer (О, О6-0.09). Visual inspection and

ultrasonic flaw detection of the seam and okoposhova zone showed no cracks,.

Conducting mechanical tests of flat discharge samples indicate. that the destruction occurs on the main metal, and not on the weld metal welded by the proposed electrode, less prone to the formation of hot cracks,

Claims (2)

1. The patent of Yugoslavia N9 23345, class, 49 (3) jCanalog). 2 .. GOST -946775, the MP-3 electrode (prototype). . .