SU863264A1 - Welding electrode wire composition - Google Patents

Description

(54) COMPOSITION OF WELDING WIRE

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The invention relates to metallurgy and can be used for the manufacture of welding wire alloys, mainly for welding high-strength stainless steels. In modern engineering for the manufacture of critical parts working under conditions of periodic heating in the temperature range of 350-500 ° C, stainless steels are used: high-strength steels. Welding of such materials (with known welding wires does not allow to obtain high-quality joints due to their tendency to embrittlement under the influence of operational heating,

The composition of the {I welding wire, containing the following COP, wt.%, Is known:

Carbon 0,01-0,09

Silicon 0.6-3.5

Manganese 0.6-1.5

Chrome 10,5-12

Nickel8,5-9,5

Molybdenum1,8-2,3

Titan0.01-0.35

Zirconium 0.02-0.1

ALUMINUM 0.01-0.15

Calcium, 0.01-0.05

Bor1 0.0001-0.003

IronErest

This type of welding wire provides joints when welding stainless stashes with a SGG strength of 110 kg / mm without conducting a hardening heat treatment. In the case of subsequent heat treatment (eakalka + aging 350-500 C,

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1h) the strength properties of the weld, although slightly increasing (to 120-130 kg / m), however, the level of toughness decreases by 1.52 times. Especially severe embrittlement

15 is observed in. the process of operational heating of the weld metal in the range of aging temperatures, which prevents the use of welded structures in the condition of prolonged heating at 350,500 s.

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The purpose of the invention is to increase the strength of the welded joint after prolonged heating in the range

25 temperatures of 350-500s.

The goal is achieved by the fact that the composition additionally contains copper, vanadium, rare earth metals (REM) with the following ratio of components, wt.% 1 Carbon 0.02-0.12 Silicon1.0-1.5 Manganese, 0.3-1.0 Chromium, 0-14.9 Nickel4.0-8.0 Molybdenum2.4-3.5 Copper0.3-1.2 SEM, 0.001-0.05050-0.06 and at least one of the group of components: Titan0.01-0 , 20 Aluminum 0,01-0,20 Zirconium 0,01-0,20 Iron Other if conditions are met: titanium + aluminum + zirconium 0,01-0,20. Copper is included in the composition to improve the strength properties of the weld metal without reducing the ductility index and impact strength. Vanadium crushes the structure of the weld metal, increasing its strength and ductility properties. SEMs have a modifying effect on the morphology of cast, tallest weld metal and increase its impact strength. An increase in the content of molybdenum provides an additional increase in the strength properties of the weld metal without a significant reduction in impact strength in the process of operational heating. The introduction of titanium and aluminum is carried out within the limits of, ensuring the increase of the technological strength of the metal | weld. In the composition of the welding wire, zirconium and calcium alloying additives are modified, modifying the cast structure of the weld metal, helping to clean the grain boundaries and increasing the technological strength of the welded joint. Boron was excluded from the composition of the welding wire due to its negative effect on the resistance to the formation of hot cracks. The range of carbon content is expanded in the direction of its increase, which ensures obtaining maximum values of the technological strength of the weld metal. Example. Compositions are made to produce welding wire. Welding wires are produced from the produced alloys of the indicated composition, which are used for welding of high-strength stainless EPES17-G STASHES with a thickness of 10 mm. Before welding, plates made of steel EPV17-F are annealed with air cooling. Manual argon arc welding with non-plated electrode with filler wires is used. After welding, the plates are cut into samples subjected to full hardening heat treatment according to the following conditions: quenching from 1000-10 ° C, cooling in water, cold treatment for 2 hours, tempering, aging 5l5i, 1-1.5 hours air cooling with subsequent long exposures at 400 and for 500 hours simulating operational heating. Mechanical tensile and toughness tests are conducted. The table shows the composition for welding wire.

The use of the proposed welding wire for welding stainless steel of high strength. provides, in comparison with the known wires, the possibility of achieving equal strength of the welded joint with the base metal when performing standard heat treatment; the possibility of using welded products under the conditions of exposure to long-term heating in the temperature range of 350-500 C. This significantly improves the quality and reliability of products made from these materials and makes it possible to achieve a significant economic effect by reducing the weight of the structure.

Claims (1)

1. USSR author's certificate 270475, cl. At 23 K 35/30.