RU1834775C - Welding wire composition - Google Patents

Abstract

Usage: automatic submerged arc welding and mechanized in shielding gases high-quality steel welding. SUMMARY OF THE INVENTION: the composition of the welding wire includes the following ingredients, May.%: Carbon 0.01-0.05. silicon 0.05-0.60. Manganese 1.10-1.60. Nickel 2.00-2.40. aluminum 0.01-0.05, nitrogen 0.005CH), 025. titanium 0.03-0.12. sulfur 0.001-0.012. phosphorus 0.001-0.015, iron the rest. In doing so, the following additional restrictions must be observed: t. .7-102 (4.60-Ni) -0.02,%. 2.S +.% Z.A1 / 2 + T1 / 3.4 N. The invention provides a weld metal having a high level of resistance to brittle fracture at low temperatures. 6 tab.

Description

The invention relates to welding production, namely to filler materials (welding wire, rods for the manufacture of coated electrodes) used for manual as well as for submerged arc welding and mechanized in shielding gas welding methods. The field of application of the welding materials based on the wire of the claimed composition is the manufacture of critical structures made of high quality steels with a yield strength of 385 to 550 N / mm, characterized by high ductility and fracture toughness at low climatic temperatures up to minus 60 ° C.

The purpose of the invention is to reduce the critical temperature of brittleness of the weld metal, i.e. creation of low carbon welding

a wire containing the necessary ratio of the main alloying elements and providing a weld metal with a high level of resistance to brittle fracture at temperatures up to minus 60 ... 70 ° C ..

The goal is achieved by using in the composition of the ingredients in the following ratio, wt.%:

carbon0.01-0.05

silicon 0.05-0.60

Manganese .1.10-1.60

nickel 2.00-2.40

aluminum 0.01-0.05

nitrogen 0.005-0.025

titanium 0.03-0.12

sulfur 0.001-0.012

phosphorus 0.001-0.015

iron ore

00 gj

sj

Vj

SL

With

In doing so, the following additional restrictions must be observed:

1.In order to ensure the optimal plasticity and cold resistance of the weld metal structure, the amount of carbon in the welding wire should not exceed the value

C 2; 7-10 2- (4.60-NIH) .02,%,

2. In order to ensure the purity of the weld metal and the specified cold resistance threshold, the content of sulfur and phosphorus should not exceed

, 021,%.

3. In order to bind free nitrogen and modify the weld metal with nitrides, the ratio

%

Within the scope of the claimed composition, depending on the silicon content, a welding wire may be used:

-for the manufacture of electrodes and automatic submerged arc welding at a silicon doping level of 0.05-0.35;

-for mechanized welding in a protective gas environment at a level of doping with silicon of 0.35-0.60%,

In accordance with the foregoing, in order to determine the practical suitability of the welding wire at the Central Research Institute of KM Prometey, steel of two groups A and B of compositions (see Table 1) was smelted within the framework of the invention (smelting N ° 1-4), as well as smelting with a prohibitive content alloying elements (No. 5-7).

Welding wire of 4.0 mm diameter was made from the steels of group A melts, which was tested as a part of coated electrodes of type 48XH-4, as well as automatic submerged arc welding 48ANK-59. From experimental melts of steel of group B, a welding wire with a diameter of 1.2 mm was made for mechanized welding in a protective gas environment. The coating composition of the electrodes made on the steel wire of the experimental melts is shown in Table 2. Determination of the mechanical properties of welded joints

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5

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5

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during welding of cold-resistant medium-hard-alloy steel of grade 12XH2MD-Sh (AB1-SH) according to TU14-1-3116-81 40 mm thick with symmetrical X-shaped cutting of edges of type C25 according to GOST 5264-80 in the modes in accordance with Table 3 . Information on the mechanical properties and cold resistance of the weld metal, estimated on the basis of serial tests of Charlie specimens with a sharp notch, is given in Tables 4, 5 and 6. The results obtained indicate high ductility values (characteristics (d B and) and cold resistance of weld metal which are superior to those of known analogues of welding consumables of the considered strength category.

For example, in terms of cold resistance of the weld metal according to the parameter KV 41 J, in international practice for high-strength shipbuilding steels, experimental welding consumables made on the basis of a welding wire of steel of the claimed composition can be used for the design operating temperatures of structures minus 50 .. .70 ° C.

Claims (1)

SUMMARY OF THE INVENTION The composition of a welding wire comprising carbon, silicon, manganese, nickel, aluminum, nitrogen, titanium, sulfur, phosphorus, iron, characterized in that the ingredients of the composition are contained in the following ratio, wt.%: Carbon 0.01-0.05 Silicon 0.05-0.60 Manganese. 1.10-1.60 Nickel 2.0-2.40 Aluminum 0.01-0.05 Nitrogen 0.005-0.025 Titanium 0.03-0.12 Sulfur0.001-0.012 Phosphorus 0.001-0.015 IronOther the amount of carbon should not exceed the value calculated by the formula 2, (4.60-Ni) - 0.02%, the total sulfur and phosphorus content should not be more than 0.021%, and the following ratio should be observed: f +,%. The content of the ingredients in the experimental compositions of the welding wire The symbol indicates transcendental values of numerical values in accordance with further limitations of the claims. Name of coating components Marble Feldspar concentrate Rutile concentrate Diopside concentrate Ferrosilicon Ferrotitanium Ferromanganese Aluminum Magnesium Alloy Powder CMC soda ash glass, over 100% dry weight charge table 2 Mass dol elements. % 4,5 - 47.0 22.0 14.0 7.0 3.0-4.0 4.0 O- 1.5 2.0 T.O. 23-25 Table 3 Mechanical properties of metal welds made by pilot welding wires Table A Coated Electrodes Based Table 5 Mechanical properties of the weld metal in automatic submerged arc welding with pilot wires compositions The mechanical properties of the weld metal with mechamziro experimental compounds B 6 6 b 6 6 No.-655 J5 668-bdo 51G1 679-686 552 682-697 652 578-588 Щ662-691 T7jt 637; 212 00 601-612 W 620-631 6T7 616-627 67l 62I-6J7 -5ft- "SSg-W 5E 618-622 5gZ 627-63E IG 15.1-26.273.6-7S, 0186-200178-187 2175 7T.T tWP7 22,, 1-73.7161-178138-160 277t 727T GT2 | T5 22.3-23.371.0-73.5164-180H3-158 2TG8727J TJV - I T 22.11-23.7 72.0-73.5 0-73.5 I7C-.I85 I1 77. J8-163 fTl- 25.3-26 7b, 0-75.1. 187-201 (48-159 2673 7lf75 F35 1P " 22.8-23. 70.0-70.5I51-15S118-127 .737Г 70ТЗ I5T V2 3 Part 2 9l ° 6M-65.2I8-1275 i-7e .18T6 6 li, 7G2G 68 Table 6 nth saark in a protective gas wire 92-130 TlS 87-115 -T6- 90-119 --5-3- 85-100 -53 "1-52 T6- H-57 Tl 58-108 I $ 65-85 77 62-92 65-83 75 27-39 -5 29- I 35-72 T9 11-65 17 3 H8-57 Tj- J9-35 Ifff 21-28 2T. 24-37 32 18-21. TT