SU1342649A1 - Activating flux for electric arc welding of stainless and high-strength steels - Google Patents

Abstract

The invention relates to welding production, in particular, to compositions of activating fluxes for electric arc welding of parts made of stainless and high-strength steels in protective gas. The aim of the invention is to penetrate the arc melting ability during welding of thicker parts over 6-8 mm. Introduction of lithium hexafluoroaluminate and titanium dioxide containing 40-60% silicon dioxide, tellurium dioxide or germanium dioxide increases the depth of proplapting due to the fact that these refractory compounds reduce the resistance of the convective flow of the liquid metal from the active spot to the bottom of the bath, 3 tabl, SL .V

Description

one

The interpretation relates to the equipment proi-1R (5ds 1-tsu, l to the elec-

arc with activating fluxes, and can be used when welding parts made of stainless steel and high-strength 1P; 1X CTajieu; TSNI improve productivity and quality of welded joints.

The purpose of the invention is a higher IQ than mixtures I through V (Table 1), including the melting ability of the welding arc and, when welding, a toliash greater than 6-8 mm.

Weld pool metal melts

due to the heat released in the active g, silicon, mixtures from VI to X (Table 2)

Mr. The spot of the arc. In addition, it is reinforced by the welding current passing through the metal, since it has an active arc spot. From the active spot to the bottom of the bath, the convective flow of the liquid Taj Jia develops. If its electrical resistance is reduced in comparison with the surrounding metal, then a greater number of welding currents will pass through the convec :: ivny11 flux. This means that it additionally heats up and transfers more heat to the bottom of the bath. The depth of penetration increases.

For the indicated reduction of the electrical ZO is insignificant.

Whose resistance is most suitable for high-tension elemental elements that have an electrical resistance at the metal temperature of the weld pool that is less than the resistance of the base metal.

The melting resistance of Ge drops by a factor of 13, while in the melting state, its resistance is of the same order as that of stainless steel of the type 18-8. The same thing happens with silicon.

The resistance Te with an increase in the temperature above the melting temperature also drops 15.5 times.

At the temperature of the weld pool metal (for steel 2000 K), all Si compounds, and especially Ge and Te dissociate. Inside the liquid metal of the bath, these elements are in an atomic state, and oxygen leaves the bath due to a lower specific gravity.

The melting points or dissociations of the oxides of these elements are higher than the melting points of pure substances, therefore it is preferable to display them as oxides. Elements with a maximum jump in electrical resistance are introduced into the flux compositions

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Scientific research institute

the maximum temperature of the plan is to ensure that 01P1 is minimally evaporated from the surface of the pann and maximum c) The electrical resistance of the convec- tion 13) south of the liquid metal flow is maximized.

To obtain the flux, fifteen mixtures of components were prepared, contain as a refractory compound of an element with an abruptly decreasing electrical component: JK Dioxide melting resistance

inclusively - germanium dioxide, and mixtures from XI to XV (taOm.Z) including Y - tellurium dioxide.

Each argon mixture was used for argon welding with tungsten electrode welding on samples from the GHTNNYT core, 8 mm thick, welding current 300 A, welding speed 9 m / g. The ranks of the depth of glorification show

that for all compositions the optimal amount of additives lies in the range of 40-60 wt.%.

In the case of the use of the composition V, X and XV, an increase in the depth of

B

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When using the composition of the flux 1, VI and XI, the resistance of the electrode is not satisfactory, falls into laoB, which is unacceptable when welding important products.

In the case of using the flux composition P, VII and CP, the resistance of the electrode is satisfactory, the depth of penetration increases.

In the case of the composition of the flux IV, IX and XIV, an increase in the penetration depth is observed with good electrode resistance.

The composition of the flux Ш, V111 and ХШ is optimal, with good electrode resistance ;; maximum penetration depth increase.

In this connection, the optimum range of variation of the amount of the additive of the refractory compound of the element with an abruptly uulshischim electrical resistance during melting; - 40-60 wt.%.

Increasing the depth of proplanar 5 reduces the number of passes when welding products with a thickness of 10 mm from four to two, and the second pass is decarcive. It is done with an appropriate weeding on a reduced

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current. In connection with this, the cost price for the purpose of increasing the floating seam meter is reduced in two arc abilities, in particular, in a tightness.

Compound flux contains a component selected from the group of: silicon dioxide, germanium dioxide, tellurium dioxide, in the following ratio of flux components, wt%:

Claims (1)

Invention Formula Activating flux for electric arc welding of stainless and high-strength steels in a protective medium containing lithium hexafluoroaluminate, titanium dioxide and a refractory compound of the element with a stepwise decrease in resistance during melting, 17.5 20 7.5 20 6560 7,47,8 Lithium hexafluoroaluminate, wt.% Titanium dioxide, wt.% Germanium dioxide, wt.% The resulting penetration depth, mm in order to increase the arc floating capacity of the arc, in most cases Compound flux contains a component selected from the group of: silicon dioxide, germanium dioxide, tellurium dioxide, in the following ratio of flux components, wt%: Lithium hexafluoroaluminate 20-30 Titanium dioxide20- S A refractory compound selected from the group: silicon dioxide, germanium dioxide, two thirty 32.5 25 thirty 32.5 50 40 35 7.2 6.3 table 2 25 25 50 thirty thirty 40 32.5 32.5 35 7,6 7.0 6.560 7.37.7 Editor A.Vorovich Compiled by T.Arest Tehred M.Hodanich Order 4553/11 Circulation 974 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Project, 4 Table 3 50 40 35 7.1 6, / Corrector S.Cherin