SU967746A1 - Additive material composition - Google Patents

Description

1, The invention relates to welding materials, in particular, to flux-cored wires, intended for welding and surfacing of steels and alloys used in chemical engineering. The known welding flux-cored wire 13 is made of a low-carbon frill and a mixture of the following composition, weight. %: Metallic chromium51-56 Nickel (electrolytic) 19.5 -24 Manganese 4.5-7.0 2.5-4.0 Calcium carbonate 2.2-3.8 Calcium fluoride 6.5-10.0 Titanium dioxide 2, 8-4.2 Ferroniobium 0.5-1.5 Hematite This wire is suitable for making joints on corrosion-resistant steels of the type 18-8. However, she has some drawbacks. In particular, it is self-shielding, and for this reason it is characterized by low sanitary-hygienic indicators. At the same time, as the data of its practical use are detailed, such wire often allows one to achieve guaranteed accuracy of the weld metal to the formation of pores due to imperfect recipes of the charge. Also known is the composition of steel C23, coaxing the following, components, weight. %: 0.01-0.05 Carbon 10.0-15.0 Nickel 4.5-6.5 Molybdenum 1.5-3.5 Manganese 0.3-0.6 Silicon 0; 55-0.7 0 , 1-0.5 O, 1-O, 3 0, O5-O, 5 It, tri. 0.05-0.2 0.1-0.25 Iron Else

39677464

This compound can be applied to Chromium introduced into the charge wire with

the quality of the filler material when welded to give an acceptable corrosion ke under the flux layer corrosion-resistant

steels, however, it does not provide sufficient resistance of the weld against intergranular 5, a manifestation of the propensity of chromium-containing corrosion of the base metal to passivation in particular, for example, an increase in the resistance of the weld metal to intercrystalline corrosion. The purpose of the invention is achieved by the fact that the composition of the material containing chromium, nickel, titanium, rhenium, additionally contains aluminum in the following ratio of components, weight. %: Nickel (electrolytic) 18-2 6 Rhenium 0.7-1.3 Titanium 2-4 Aluminum 2-6 Chromium. (metal) Else For manufacturing metal wires, conventional low carbon steel is used. . Let us analyze the quantitative effect of the components included in the charge of the proposed wire on the quality of the directional metal and the sanitary conditions associated with its melting, for which we look at the results and look at the results of comparative tests (table For the experiments, a mixture of consistently contained (in the form of metal powders),%: 0.5; 0.7; 0.9; 1.1; 1.3 and 1.5 rhenium; 16.0; 18.0; 2O, O; 24, 26.0 and 28.0 nickel; O; 1.0; 2.0; 3.0; 4.0 and 5.0 titanium; O; 1, O; 2.0; 4, Q; 6.0 and 8, 0 aluminum, and also chrome, with the remaining additional part (up to 100%). Experimental compositions of the proposed 3 mm diameter wire are made of low carbon tape with a filling ratio of 0.4%. All experiments are performed by welding the main flux from commercial power sources on samples in The form of sheet plates 50Xx25Xx12 mm in size from chromium-nickel steel of type 18-8 and special corrosion-resistant alloy of grade EI-943. According to the results of the experiments presented in the table, the gapped wire provides little gassing during melting and contributes to the creation of normal working conditions for welders-operators.

Claims (2)

resistance to welded seams. This role is fairly well known and is associated with well-known production media, for example, with concentrated solutions of nitric and sulfuric acids. Nickel also belongs to the known components introduced into the charge for the intended purpose. Its positive effect is to provide a given austenitic structure of the weld metal with a simultaneous message to the latter of the required corrosion resistance. However, the limits of the optimal content of this element in the charge of the wire are 18–26%, which is associated with the following experimental facts. In the case of the introduction of nickel less than 18% and the content of other components in the claimed limits, the welds, as a rule, have an increased concentration of ferrite, which results in their reduced mechanical properties - first of all, impact strength (less than MJ / m) and ductility (not more than 2% Cl) versus 1.3-1.6 MJ / m and 3035% cGsB if it is optimally contained. Exceeding nickel versus 26% (for example, 28%) causes a slight decrease in technological properties due to the formation stable austenitic structure and, as a result, extremely low The crack-resistance of the deposited metal. Titanium, referred to as active carbide formers, is introduced into the mixture in order to achieve durability of intercrystalline corrosion in welds. Such an effect is known, however, within this wire composition, the concentration of this component is not arbitrary. , and taking into account the results of the experiments performed, for example, a decrease in the titanium concentration of less than 2% (in particular, O and 1.0%) leads to susceptibility to intergranular corrosion in welds, and A subsequent excess of more than 4.0% (in particular 5.0%), without affecting the further improvement of the quality indicator under consideration, causes a certain decrease in mechanical properties due to the occurrence of excessive 5 9 ferrite content in the structure of the seams and Aluminum-known gamma-solid solution, the doping of which is carried out practically within known limits by a known direct purpose — to shred the structure and thereby provide the required, from the point of view of processability, mechanical their metal properties, Swiss However, compared with the technical solution E, aimed at improving the ductility of the welds by incorporating alumina - in charge of this wire upper limit of this element is above and is 6%, which is due to the presence in its composition of rhenium. With further increase in aluminum (for example, 8%), the metal deposited by the proposed wire is characterized by slightly lower plastic indices. The doping of the charge with rhenium, carried out in order to achieve one of the objects of the invention, leads to an increase in the corrosion resistance of the weld metal. It can be presumed to conclude that the positive role of rhenium is in a peculiar effect on the mixing of stationary passivation potential in the region of positive values, i.e., on individual 6 electrochemical characteristics of the weld metal. The results of the experiments show that the best corrosion resistance in highly corrosive environments is manifested by welds welded with wire, from 0.7-1.3% in the charge. At the same time, the introduction of less than 0.7% of this component into the mixture (for example, 0.5%) has little effect on the quality indicator under consideration, and an excess (over 1.3%) practically does not lead to a further improvement in corrosion resistance. On this basis of the scientific research institute, the upper limit of the rhenium content in the charge is advisable to limit 1.3%, and the lower - 0.7%. The wire provides high corrosion resistance of the weld metal and good sanitary and hygienic conditions for welding, especially inside closed vessels, containers, etc., and is also characterized by availability in production. The proposed wire can be widely used in welding chemical equipment. Its use significantly improves the reliability of welded structures, reduces the requirements for technological discipline in the manufacture of wire and welding of the structure and improves working conditions. 9 96 Claim of the invention The composition of the filler material mainly of the charge of the flux-cored wire for welding of corrosion-resistant steel, copper and alloy containing nickel, chromium, titanium, rhenium, characterized in that, in order to increase the resistance of the weld metal to intergranular corrosion, it also contains the ratio of components, weight. %: 18-26, - 0.7-1.3 610 Titanium 2.0-4.0 Aluminum i2, O-6.0 Chrome Else Sources of information taken into account during the examination i. USSR Author's Certificate No. 527278, cl. B 23 K 35/368, 22.O4.75. 2. USSR author's certificate No. 485173, cl. C 22 C 38/50, 04/29/74 (prototype).