JPH03258488A - Agent for preventing sticking of welding spatter - Google Patents

Abstract

PURPOSE:To improve workability and environmental characteristic by compounding respectively specific concn. ranges of >=1 kinds of the metallic inorg. acid salts selected from the alkaline metal salts, alkaline earth metal salts, amine salts and ammonium salts of metallic inorg. acids and surfactants as essential components. CONSTITUTION:The agent for preventing sticking of welding spatters is constituted by compounding 5 to 35wt.% one or >=2 kinds of the metallic inorg. acid salts selected from the alkaline metal salts, alkaline earth metal salts, amine salts and ammonium salts of the metallic inorg. acids and 1 to 20wt.% surfactants as the essential components. The metallic inorg. acids are boric acid, aluminic acid, silicic acid, etc., and are used as various kinds of salts. While any surfactants among nonionic, anionic, cationic, and amphoteric systems are usable, the nonionic surfactants yield adequate results in many cases. This agent is not decomposed in spite of welding heat and can be easily removed by detergents of acids, alkalis, thinners, etc., after use. No problems are thus left in post stages.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coating agent for preventing spatter generated during arc welding of steel materials from adhering to base materials around welding, that is, welding spatter. It relates to, inter alia, the use of anti-adhesive agents.

[Conventional technology] Traditionally, welding spatter adhesion agent I) has been divided into two types: one is a direct coating type in which paint is applied directly over the coating while leaving the applied film after welding, and the other is a thinner to remove the applied film after welding. , a degreasing cleaning type that removes fat by degreasing with alkali, acid, etc.

The present invention relates to the latter type of cleaning, and conventional cleaning methods of this type can be classified into three types as shown below, each of which has its own drawbacks.

The first type is a dispersion type in which the main ingredients are inorganic powders such as talc, calcium carbonate, magnesium carbonate, and titanium oxide, which are dispersed in a solvent such as water with the addition of a thickener. The disadvantages include an increase in the number of stirring steps, the scattering of powder during cleaning, which degrades the environment, and the difficulty of disposing of cleaning waste liquid.

The second type is silicon-based, which is dissolved in a solvent or dispersed in water as an emulsion using a surfactant, and is called the silicon type and is used for stainless steel welding. The silicone type is difficult to remove after use without the use of highly toxic acids such as nitric acid or hydrofluoric acid.Additionally, the silicone film re-attaches when pickling is continued for a long time, resulting in uneven removal. exists.

Furthermore, the third type uses a water-soluble resin such as polyvinyl alcohol or polyethylene glycol as the main component, but the welding heat causes a portion of the resin to carbonize, and this carbonized portion is susceptible to acids and alkalis. It also has the disadvantage of being difficult to dissolve (resulting in poor removal), and if it is painted over without being removed, poor adhesion will occur.

[Problem to be solved by the invention] The present invention provides a sputter adhesion prevention LE that does not have the above-mentioned problems.
It was developed for the purpose of developing a chemical agent that can be easily removed in the cleaning process without increasing the number of conventional work processes, leaving no problems in subsequent processes, and without deteriorating the working environment. It is an object of this invention to provide a welding spatter adhesion prevention agent that has excellent spatter adhesion prevention properties, has high heat resistance, and can be used for a long period of time without forming suspended matter or sediment in a cleaning solution tank such as an acid or alkali. It is something to do.

[Means for Solving the Problems] In order to achieve the above object, a surfactant and various salts of metal inorganic acids such as boric acid, molybdic acid, and tungstic acid are used in combination as a cleaning type welding spatter adhesion prevention agent. When tested, it was found that a mixture of these ingredients in a predetermined ratio had very good performance.

That is, the present invention contains 5 to 35% by weight of one or more metal inorganic acid salts selected from alkali metal salts, alkaline earth metal salts, amine salts, and ammonium salts of metal inorganic acids;
and 1 to 20% by weight of a surfactant as essential components, a welding spatter adhesion inhibitor,
The main points are as follows.

Metal heat 411N in the present invention includes boric acid, aluminic acid, silicic acid, stannic acid, titanic acid, chromic acid, molybdic acid, tungstic acid, manganic acid, etc., and these are used as various salts as shown below. be.

In other words, alkali metal salts such as sodium salts, potassium salts, and lithium salts of metal inorganic acids, alkaline earth metal salts such as calcium salts and magnesium salts, and metal inorganic acids selected from the same amine salts, ammonium salts, etc. Fourteen or more types of acid salts are used.

Note 1: For example, when using an alkali metal borate, it may be used by mixing boric acid with a caustic alkaline solution, or it may be used as an alkali metal borate by dissolving boron oxide in a caustic alkali solution. It is.

Moreover, when used as the above-mentioned amine salt or ammonium salt, it is possible to use the following various types of amines in addition to ammonia.

Lower (mono, di, tri)alkylamines methylamine, ethylamine, propylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine,
Cyclic amines such as n-butylmethylamine, i-diethylamine, tributylamine, methyldiethylamine Diamines such as morpholine, pyrrolidine, piperidine Hydrazine Substituted amines such as methylhydrazine, 2-3 toluenediamine, ethylenediamine Hydroxylamine, ethanolamine Diethanolamine , butanolamine, hexanolamine, methyljetanolamine, octatoolamine, diglycolamine, other polyglycolamines, triethanolamine, methylethanolamine, n-7 minoethanolamine, etc. Polyamines diethylenetriamine, triethylenetetramine, hexamethylene The present invention, such as tetramine, contains one or more selected from the above various metal inorganic acid salts and a surfactant as essential components, and the proportion of the metal inorganic acid salts is 5 to 35% by weight. % is required.

If the proportion of the metal inorganic acid salt is less than 5% by weight, the effect of preventing spatter adhesion will be low.

On the other hand, if this proportion exceeds 35% by weight, welding defects such as blowholes and bits are likely to occur when the welding material enters the welding bead, and the cleanability with thinner is reduced.

Next, as the surfactant to be blended in the present invention, any of nonionic, anionic, cationic and amphoteric surfactants can be used, but nonionic surfactants are more likely to yield favorable results. There are many.

Examples of the nonionic surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene alkyl phenol ethers such as polyoxyethylene nonylphenol ether, and polyoxyethylene alkyl ethers such as polyoxyethylene monostearate. esters, polyoxyethylene rubitan monoalkyl esters such as polyoxyethylene sorbitan monolaurate, etc.
Examples of anionic surfactants include alkyl carboxylate fatty acid layer esters such as rosin soap, alkyl sulfates such as sodium dodecylbenzenesulfonate, and alkyl alcohol sulfate ester salts.

Further, as the cationic surfactant, N-alkyltrimethylenediamine salt, dialkyldimethylammonium chloride, polyoxyethylene alkylamine, etc. can be used.

Furthermore, examples of amphoteric surfactants include alkylbenzyldimethylammonium, laurylbetaine, imidazoliniumbetaine, distearyldimethylammonium chloride, and the like.

Such surfactants are used alone or in combination as appropriate, and are blended into the composition containing the above-mentioned gold m inorganic acid salt as a main component, and the blending ratio is in the range of 1 to 20% by weight. If this ratio is less than 1% by weight, it will be difficult to remove metal inorganic acid salts when cleaning with thinner after use, while if this ratio exceeds 20% by weight, carbides will be likely to be formed due to welding heat. This makes it difficult to remove carbides during the cleaning process.

The metal inorganic acid salt and surfactant in the present invention are mixed and dissolved in an appropriate solvent within the concentration range described above, and the solvent is not particularly limited, but may be water alone or water and water-soluble alcohol. The water-soluble alcohols include methanol, ethanol, impropatol, ethylene glycol, glycerin, and derivatives thereof.

In addition, when actually applying the spatter adhesion prevention agent of the present invention, appropriate amounts of rust preventive agent, thickener, leveling agent, coloring agent, fragrance, etc. may be added to the extent that does not impair its performance depending on the usage conditions. They may be used together.

[Function] The present invention is a welding spatter adhesion inhibitor having the above-mentioned structure, and contains no metal as the main component! Acid salts have high heat resistance and are not easily decomposed by welding heat, so even if there is a heat history from welding, they can be easily removed by dissolving in the pickling or alkaline washing process. When cleaning by immersing in an acid or alkali, no floating matter or sediment is generated in the cleaning liquid tank, and the cleaning liquid can be used for a long period of time.

Moreover, the metal inorganic acid salt film is easily removed even during the thinner washing process due to the surfactant blended in an appropriate amount with the metal inorganic acid salt, and due to the action of this surfactant, the metal inorganic acid salt film is removed easily. adheres uniformly to the weld base metal.

This highly heat-resistant, uniform film reliably prevents spatter from adhering to the base material, eliminates appearance defects after painting and plating, and eliminates the cause of rust.

Furthermore, as mentioned above, the inhibitor of the present invention can be easily removed in a cleaning process such as pickling or alkaline cleaning after use, so it does not leave any problems in subsequent processes, and there is no scattering of powder or contamination from cleaning solutions, which improves workability and the environment. The quality is also excellent.

[Example] Examples 1 to 6 in which the following various metal inorganic acid salts a to f and various surfactants of I/L were blended as shown in Table 1, and a comparison in which they were blended as shown in Table 2. Examples 1-4 were each prepared.

Metal inorganic acid salts (each inorganic acid + each alkali solution) a...Sodium borate b...Boric acid monoethanolamine salt C...Aluminate jetanolamine salt d...Magnesium aluminate e...・Sodium molybdate f...ammonium tungstate surfactant a...polyoxyethylene lauryl nitrate...
Polyoxyethylene dodecyl phenyl ether ha... Monoalkyl quaternary ammonium salt Table 1 Table 2 (Incidentally, each numerical value is weight %) (In addition, each numerical value is weight %) Each of the above Tables 1 and 2 Each of the compositions was applied by brushing to the weld base metal, and a welding test was conducted under the following welding conditions.

Welding conditions Carbon dioxide arc welding Welded a mild steel plate with a thickness of 9cm using a T-shaped fillet Welding current: 300A Arc voltage: 30V Welding speed: 50cm/min Wire diameter: 1.2*φ Gas flow rate... 20 sentences/min Table 3 Evaluation The number of spatter deposits and the number of pits generated in 100 cl' after welding were measured for each composition test, and the cleaning properties with thinner, acid, and alkali were tested. did.

These results are shown in Table 3.

Note that the symbols in the table indicate the following contents.

■...Good cleaning performance with no decomposition products.

O: A slight amount of decomposed product remains, but there is no problem in the subsequent process.

Δ: A small amount of film remains, causing problems in subsequent processes.

×: Most of the film remains and cannot be removed.

From Table 3, it can be seen that the examples of the present invention exhibit excellent spatter adhesion prevention properties, have no welding defects, and have excellent film cleanability in both thinner acid and alkali. It is.

On the other hand, when both the amount of metal inorganic acid salt and the amount of surfactant are insufficient, as in Comparative Example 1, the number of spatter deposits increases, and as in Comparative Example 2, the amount of surfactant is insufficient. In addition, if there is too much surfactant as in Comparative Example 3, welding defects may occur, and the detergency with acids and alkalis decreases. If there is too much salt, there will be more welding defects.
The cleaning performance is also lowered, and in particular, the cleaning performance with thinner and alkali is significantly inferior.

[Effects of the Invention] The effects of the present invention are as detailed in the effect section, but can be briefly summarized as follows.

(1) It is a spatter adhesion inhibitor that does not decompose even under welding heat due to the high heat resistance of the metal inorganic acid salt as the main component.

(2) Therefore, after use, it can be easily cleaned with a cleaning agent such as acid, alkali, thinner, etc., and no problems will remain in subsequent processes.

(3) When this blended composition is washed by immersing it in an acid or alkali, it can be used for a long period of time without forming suspended matter or sediment in the washing solution.

(4) Easy to apply to welding base metal (forms a uniform film and has excellent spatter adhesion prevention properties).

(5) Workability and environmental friendliness are also good.

As described above, the sputter adhesion inhibitor of the present invention has various excellent effects and is extremely useful in the field of welding technology.

Claims (1)

[Claims] 1. 5 to 35% by weight of one or more metal inorganic acid salts selected from alkali metal salts, alkaline earth metal salts, amine salts, and ammonium salts of metal inorganic acids, and 1 to 20 weight % of a surfactant. %, as an essential ingredient.