SU1049225A1 - Composition of powder wire for welding low-carbon steel - Google Patents

Description

This invention relates to open carbon steels with an open arc. The composition of powder wire is well-known, consisting of steel shells and powdered components containing the following components, wt.%: Calcium oxide .5-2.5 Hydrofluoric. 5-8 Rutyl 4.8-7.5 concentrate 1.5-2 , 5 Ferrotitanium 1.6–2.4 Aluminum 1–1.5 Ferromanganese 0.4–0.7 Cremetium Iron pore shock Steel cobalt of the barrel The disadvantage of this composition is low separability of the slag of the crust, a tendency to porosity of the weld. also the composition of f2 of the bulk wire, consisting of a sheath and a powder blend containing the following codes, weight,%: Marble 1,7-2,4 Plavic feldspar 5-6,8 Rutklovy concentrate 4.8-6.4 Ferromanganese 0.9-1.2 Iron poros 16-21 shock 1.4-2 Ferrotitanium 1.8-2.2 Alcnium 0, L-0,6 Silicon Staln The rest of the titanium and aluminum are introduced in a ratio of 1: 4. The mechanical disadvantages of the well-known sos are low inclination of the seam of the weld, porosity. the composition of the flux-cored wire welding low carbon steels, consisting of a steel sheath and powdered mixture containing marble, fluorspar, rutile con, centrate, ferromanganese, iron powder, aluminum, Ferrotitanium, additionally contains nickel, ferrosilicon and hafnium in the following ratio, wt.%: Rutile 4.0-5.0 concentrate 1 , 0-1.5 Fluorized marble 4.0-6.0 Ferromarga spar1, 2-1.5 mineral 2.0-2.4 Aluminum 1.5-2.0 Ferrotitanium 0.6-0.8 Ferrosilicon 0, 1-0.3. Hafnium Nickel 0.5–0.7 Iron po37, 5–20.0 Roshok Steel and Other Rest In order to increase the plasticity of the weld, hafnium was introduced into the wire. Hafnium, lowering the lawn of the seam increases its plasticity. Vigorously interacting with oxygen, nitrogen, carbon, hafnium forms stable chemical compounds and therefore reduces gas evolution during the crystallization of the weld, thereby significantly increasing its resistance to pore formation. The introduction of ferrosilicon in the composition of cored wire improves the strength of the weld metal. Nickel is introduced into the powder wire to increase the ultimate strength and impact strength. Due to the dissolution of nickel in the ferritic phase, the strength and impact strength of the weld metal increase. The use of nickel also reduces the tendency of porosity due to its property of reducing the mobility of hydrogen in the tadium of van1 g. Nickel content; Etalle stitch contributes to its corrosion resistance. Cored wires of ribbed section are made, specific saws of which are listed in Table. I.

Table

For the manufacture of flux-cored wire, steel strips are used; marks of 08 cl with a size of 0.642 mm.

Butt-welds on steel plates Art. 3 x 250 mm in the following modes: welding current 300-320 A, arc voltage 24-25 V, welding speed 20 m / h. During welding, stable melting of the wire, low spattering of the electrode metal, good weld formation, and complete penetration of the metal being welded are observed. Powder wire provides the following composition of the weld metal,%:

,one; Si-0i3-0, Mn-0.9-1.1; , 3-0 ,.

The propensity for porosity is determined by the number of pores in the bead welded into a V-shaped groove, into which rust has been previously filled. Cutting is carried out in a plate with a thickness of 20 mm to a depth of 6 mm, an opening angle of 90. After the surfacing, the surface of the bead is shot and inspected, the results are shown in Table. 2

Table 2

Claims (2)

COMPOSITION 23 K 35736, 04/15/74. USSR certificate 23 K 35/36, 06/13/72 _____ POWDER WIRE FOR WELDING LOW CARBON STEELS, consisting of a steel shell and a powder mixture containing rutile concentrate, marble, fluorspar, ferromanganese, aluminum, ferrotitanium, iron powder, and The reason is that, in order to increase the mechanical properties of the weld metal and reduce the tendency of the weld metal to porosity, the composition of the charge additionally contains hafnium, ferrosilicon and nickel with the following constituents, wt.%: Rutile concentrate Marble Ferromarga fluorspar ec Aluminum Ferrotitan Ferrosilicon powder Hafnium Nickel Iron Steel shell ratio kom4,0-5,0 1.0-1.5 4.0-6.0 1.2-1.5 2.0-2.4 1.5-2.0 0.6-0.8 0.1-0.3 0.5-0.7 • a 17, 5-20.0 Rest