SU517443A1 - The composition of the filler rod - Google Patents

Description

(54) COMPOSITION OF GRADE BAR FOR WELDING AND PAYKOSWARK OF GRAY PIG IRON

The invention relates to the composition of an additive material intended for gas welding and brazing of gray iron, and can be used in various fields of engineering, in particular, in iron foundry and in the repair of cast iron parts that have been out of service.

The composition of the filler rod is known, containing the following components, its components, and weight. %:

3-3,4

Carbon 3-3,6

Silicon

Manganese 0.4-0.7 0.2-0.5

Nickel 0.1-0.2

Titanium

Copper

1-2 0.1-0.3

Tin Rest

Iron

However, the use of a known filler rod is possible only with a flux, which complicates the technological process and narrows the application area of the additive, since powdered fluxes do not provide a continuous slag noKipoBa on the surface of the weld pool. This leads to uneven structure in different parts of the weld and Obsh, her process instability. In addition, the discontinuity of the slag cover on the one hand contributes to the formation of nonmetallic inclusions, and on the other hand to the penetration of gases into the metal of the weld pool, which increases the possibility of the formation of porosity in the welded joint. In order to improve the quality of the welded joint and provide the properties of the sagging of the filler rod, the composition additionally contains boron, cerium and yttrium in the following ratio of components, weight. %: Carbon3,4-3,7

Silicon2.7-3.7

Manganese0.4-0.7

Nickel0.1-0.6

Titan0,1-0,2

Copper0.01-2.5

Tin 0,01-0,5

Bor0.05-0.2

Cerium 0.05-0.25

Yttrium0.02-0.15

IronErest

When the copper content is above 1.5%, the tin content may be at the lower limit; when the tin content is above 0.3%, the copper concentration in the filler material may be at the lower limit of its content.

Claims (2)

The composition of the filler material can be introduced chromium to 0.1%. The sulfur and phosphorus content should not exceed, respectively, 0.08 and 0.25%. The news that., The content of boron in cast iron is more definite excepting: wok, improve its properties. The experiments showed that the addition of rare-earth metals to the cast-iron welding rods results from welding of self-fluxing phenomena. Pilot production work was carried out to study the influence of the main and alloying elements in the cast iron of the filler bars on the characteristics of the nano-metal. The developed filler rod during welding without the use of fluxes in the welding vain ensures a dense weld with the structure of gray pearlite cast iron, both when repairing castings in the iron foundry and when repairing parts made of cast iron, which were in operation for a long time under the impact of arresive media. Example 1. Cast iron for filler bars of the following composition (wt.%): 3.44 ° C; 3.52 Si; 0.45 Mp; 0.13 P; 0.04 s; 0.08 Cr; 0.48 Ni; 2.26 C; 0.01 Sn; 0.12 V; 0.08 Ce; 0.05 Y was melted in an induction high-frequency electric furnace with a capacity of 20 kg. The metal in the furnace was superheated to 1450 ° C and kept at this temperature for 20 minutes. The bars were cast in the chill. In the process of gas welding and brazing of gray cast iron and gas welding of cast iron with a coarse structure without additional flux in the weld pool, the cast rods give a dense weld metal with the structure and hardness of gray pearlitic cast iron. Example 2. Cast iron for additional bars of the following composition (wt.%): 3.4 ° C; 2.77 Si; 0.43 MP; 0.19 P; 0.07 S; 0.06 Cg; 0.36 N1, 1.95 C; 0.01 Sn; 0.09; AT; 0.06 C1; 0.03 Y was melted in the cupola. In the digger, the metal was held for up to 20 minutes. The bars were cast in the chill. In the process of gas welding and brazing of gray cast iron without the use of fluxes, cast rods provide self-fluxing and give a dense welded neck, with the structure and hardness of gray pearlitic cast iron. The proposed composition expands the possibility of gas welding, allowing to increase the range of defects in iron castings, which can be qualitatively corrected. The invention The composition of the filler rod for welding and brazing gray iron, containing carbon, silicon, manganese, nickel, titanium, copper, tin, iron, characterized in that, in order to improve the quality of the welded joint and to ensure the self-fluxing properties of the filler rod, the composition additionally contains boron, cerium and yttrium in the following ratio of components, weight. %: Carbon3,4-3.7 Silicon2.7-3.7 Manganese0.4-0.7 Nickel0.1-0.6 Titanium0.1-0.2 Copper0.01-2.5 0.01-0, 5 0.05-0.2 0.05-0.25 0.02-0.15 Yttrium Rest Iron