SU1316774A1 - Flux for soldering steel,copper and nickel alloys - Google Patents

Abstract

The invention relates to the field of soldering, in particular to the composition of the flux for soldering steel, copper and nickel alloys. The aim of the invention is to reduce the temperature range of flux activity, increase its fluidity and fluxing activity. The flux contains the following components, wt%: potassium fluoride 20-25; boric anhydride 10-18; cadmium chloride 5-13; sodium chloride 4-10; eutectic: bora-potassium boroftoristy - 45-60. The flux has a temperature range of activity of 430-650 ° C. The flux can be used when soldering with gas burners, immersion, in furnaces, and heating with high frequency current. The flux provides high-quality repair work using solders that melt at a temperature of 450-500 ° C. 2 tab. se (L

Description

67742

10% of the flux melting point.

The flux is prepared as follows. .

5 First, the eutectic composition is melted: 31% borax and 69% potassium boron fluoride. Melting is carried out at a temperature of about 350-380 ° C. The prepared eutectic alloy is ground to powder. 45-60% powder is added to the remaining flux constituents and mixed thoroughly.

The flux can be used when brazing with gas torches, immersion, in furnaces and with high frequency heating. After servicing, the flux is rinsed in running warm water.

The examples of the performance of the flux are given in Table 20. one .

Table 1

15

Composition

25

The ratio of components wt.%

 Till

IV

1131

The invention relates to soldering, in particular, to the composition of the flux used to solder steel, copper and nickel alloys at 430-650 ° C, mainly silver solders, and can be used in the engineering, energy and appliance industries in the production of repairing of brazing products. .

The purpose of the invention is to reduce the temperature range of the flux activity, increasing its fluidity and fluxing activity.

The flux has the following composition, in wt.%:

Potassium fluoride 20-25

Boric anhydride 10-18

Cadmium chloride 5-13

Sodium chloride 4-10

Eutectic: Bura-potassium boron fluoride 45-60

The specified composition is established experimentally, has a t 350-370 C and a temperature range of activity 430-650 C.

The introduction of borax into it, which forms a low-melting eutectic with potassium borofluoride at a ratio of 31% and 69%, respectively, with t 320 ° C, reduces the temperature range of activity. When the eutectic content is less than 45%, the lower limit of the activity interval and the flux viscosity increase, while the eutectic content exceeds 60%, the flux activity decreases.

Cadmium chloride contributes to a more complete wetting of the surface with solder, resulting in a decrease in the number of pores; Due to the exchange reaction, a film of liquid cadmium is planted from the flux on the surface of the flux; it partially transforms into a vapor groove, which contributes to an increase in the strength of the solder joint. When the content of cadmium chloride is less than 5%, the flux activity deteriorates, and when the content of cadmium chloride is more than 13%, the melting point of the flux increases.

Sodium chloride is introduced into the flux as an active ingredient in order to increase the fluidity of the flux. When the content of sodium chloride is less than 4%, the flowability of the flux deteriorates; when using the proposed flux, the content of sodium chloride more ensures high-quality performance

As a criterion for assessing the activity of this flux, the spreading property of silver solder on the melted surface is presented, which is presented in Table. 2

Table 2

2

10% of the flux melting point.

The flux is prepared as follows. .

The eutectic composition is first melted: 31% borax and 69% potassium boron fluoride. Melting is carried out at a temperature of about 350-380 ° C. The prepared eutectic alloy is ground into powder. 45-60% powder is added to the remaining flux constituents and mixed thoroughly.

The flux can be used when brazing with gas torches, immersion, in furnaces and with high frequency heating. After servicing, the flux is rinsed in running warm water.

Examples of performance of the flux are given in table. one .

Table 1

Composition

The ratio of components, wt.%

 Till

IV

As a criterion for evaluating the activity of a given flux, the spreading property of silver solder over the melted surface is given in Table. 2

Table 2

repair works with the use of solders melting at AZO-ZOO C on products made of steel, nickel, copper and its alloys, made using more high-temperature solders, and thus provides a reduction in production losses: increases the yield of suitable products, prolongs their operational period ; Improving the wettability of the paired surfaces provides a higher quality of soldering and, consequently, higher strength characteristics of the solder joint, for example, copper butt joints, soldered under flux F284 with SOO-SZO C, showed a tensile strength of 2.1- 4.5 kg / mm, the samples brazed with the same solder with the proposed flux showed a strength of 5.1-a, 2 kg / mm.

There is a flux in the liquid, which contributes to a more complete wetting of the immersed surface with it, as well as a better component L. Abrosimova Editor M. Tovtin Tehred N. Glushchenko

Co. By

2384/11 Circulation 975

. VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Who flush after cleaning and soldering. Invention Formula  The flux for soldering steel, copper and nickel alloys containing potassium fluoride, boric anhydride and potassium borofluoride, which is different from the fact that, in order to reduce the temperature range of activity of the flux, increase its fluidity and fluxing activity, it additionally contains cadmium xnopHCTbuj sodium chloride and borax In the form of eutectic with potassium borofluoride in the following ratio, wt.%: Potassium fluoride 20-25 Boric anhydride Cadmium chloride5-13 Sodium chloride 4-10 Eutectic: borax - potassium borofluoride 45-60 Proofreader M. Sharoshi .Subscription