JPS6032559B2 - Method for producing welding flux containing B - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a flux for uniformly dispersing and distributing a B compound in a welding flux for the purpose of uniformly adding B to a weld metal.

In recent years, Ti has been added to the weld metal to ensure the toughness of the weld metal.
-There is a tendency to become B. Therefore, flux containing B,
Welding materials such as wire are becoming more common. Conventionally, welding fluxes that do not contain B compounds have been manufactured by mixing all of the components at once.

However, when attempting to produce a flux containing B compounds using such conventional flux production methods, "In order to uniformly disperse the B compounds in the flux, it is necessary to use a fine material of 60 mesh or less, and this B compound must be used. Because the compound has high hygroscopicity and tends to form lumps, it is difficult to uniformly disperse and distribute the B compound in the flux. , B in the weld metal
It was found that it was difficult to uniformly reduce and add the These shortcomings should be improved. Upon investigation, the reason for the non-uniform dispersion as described above is that the entire amount of the flux components is mixed at once, and most of the components have a specific gravity similar to that of the B compound. It was found that this was due to the fact that the particles of compound B could not be separated en masse and became agglomerated to a certain size.

Therefore, in order to uniformly disperse and distribute the B compound, which is fine and easily absorbs moisture, in the flux without clumping, it is necessary to
By adopting a so-called partial mixing method in which one or more of the metals and alloys with high specific gravity among the flux constituents and the B compound are mixed in advance, the B compound is solidified into particles by the metal or alloy with high specific gravity. As a result, it became clear that it was possible to disperse and distribute the particles uniformly in the flux. The present invention has been made based on the above findings.

That is, in the production of a welding flux containing B, the present invention involves pre-mixing a compound containing B with one or more of the metals and alloys among the constituents of the flux, and then mixing the mixture with a composition other than the above. This is a method for producing a welding flux containing B, which is characterized by mixing the B-containing flux with the B-containing welding flux.

The welding flux used in the present invention is a general term for flux such as fired flux for latent arc welding, coating material for covered arc welding, electroslag, coating agent for coating consumable nozzles used in electrogas welding, etc. It is something to do. In addition, the compound having B mentioned here is
Sodium commercially available for industrial use or as a reagent
Used as meta-, 2-, 4-, 5-, 6-, and 8-alkali acid salts of alkali metals such as potassium and lithium, calcium-based compounds such as colemanite, magnesium-based compounds such as polasite, or B additives for steelmaking. The MB agent, which has been used as a secondary acid, refers to shelf acids such as metastasic acid and lateral acid.The present invention will be described in detail below.

First, a flux containing B is mixed with all the flux components at once, and one or more metals or alloys among the flux components and a compound containing B are mixed in advance, and then this mixture and other components are mixed together. Figure 1 shows the results of measuring the distribution of 8 in these fluxes using an X-ray microanalyzer.

In the figure, b is the case where all the flux components are mixed at once, and a is the flux manufactured by a partial mixing method in which one or more of the flux components and a compound containing B are mixed in advance with one or more metals or alloys. These are the measurement results.

As is clear from the figure, in the flux obtained by the manufacturing method in which the entire amount is mixed, the B peak is not present in some parts, indicating that B is not uniformly distributed in the flux.

On the other hand, in the flux produced by the partial mixing method, the peak width of B is wide as shown in FIG. 1a, and it is clear that B is uniformly distributed in the flux. Therefore, when producing a flux containing B, as in the present invention, a compound containing B and one or more metals or alloys are mixed in advance among the flux components, and then mixed with other components. It can be seen that a production method involving recombination, so-called partial mixing, must be used.

The effects of the present invention will be illustrated in more detail with reference to Examples below.
Examples Of the constituents of the flux for submerged arc welding, the constituents shown in Table 1, excluding the B compound and metals/alloys, were used.

Further, the amount of the B compound added was 0.36% based on &0% odor. The partial reaction time between compound B and metal or alloy is 2
The mixing of this mixture with other constituents is 25 minutes.
It was a minute.

metal used.

Table 2 shows the types of alloys or B compounds, their specific gravity and amount added, the type and concentration of the fixing agent, the firing temperature, and the amount of B in the latent arc weld metal using these fluxes. In this case, the flux particle size is constant at 12 mesh or less, and submerged arc welding is performed with 3 fluxes for each flux.
B analysis was conducted in each weld metal. Table 1 Female position; Registrar 'Cq) Group' of N <.

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Satoshi 40 Ripu Katsuo 0 ni Itsuki et al. × Azusa L. Brain S Renme l Keikimanya Risan'Fukkyoku SQ Tosenzu 〇Dokugu N [Misasasafunebude no Shigeru※※ * Figure 2 shows submerged arc welding metal using each flux shown in Table 2 The analysis results for B in the diagram are illustrated.

Sample No. of Machine Axis Table 2 The figure corresponds to the case where the flux containing Kamegawa B is produced by mixing the entire amount, and the 1 to 1 spots indicate the B analysis value in the weld metal when the flux produced by the method of the present invention is used. It is something that

As is clear from the figure, the amount of B in the weld metal using flux produced by mixing all the flux constituents at once varies widely. On the other hand, it can be seen that the reduction of B into the weld metal using the flux obtained by the production method of the present invention is stable, and the analytical values thereof also show approximately constant values.

Although this example shows an example in which the method of the present invention is applied to the production of fired flux for submerged arc welding, the present invention is not limited to this, and the present invention can be applied to the production of the various welding fluxes described above. Needless to say.

If flux is produced by the method of the present invention as described above,
The B compound can be uniformly distributed in the flux, and as a result, the reduction and addition of B to the weld metal can be carried out stably.

[Brief explanation of the drawing]

Figure 1 shows the results of measuring B distribution in flux using an X-ray microanalyzer, and Figure 2 shows the results of analyzing B in latent arc weld metal using flux according to the present invention method and conventional method. It is. 'Pictures of Buddha) 'Tai'Europe's 2 pictures

Claims (1)

[Claims] 1. When producing a welding flux containing B, after pre-mixing a compound containing B with one or more metals and alloys among the flux constituents, the mixture and constituents other than the above are re-mixed. B characterized by mixing
A method for producing a welding flux containing.