JPS59150666A - Anti-spatter agent - Google Patents

Abstract

PURPOSE:To prevent sticking of spatter during welding at a high temp., multi- layer build-up welding and melt cutting by using an anti-spatter agent contg. zirconium oxide or a zirconium compd. forming zirconium oxide when heated as an effective component. CONSTITUTION:The reason for using zirconium oxide or a zirconium compd. lies in that the zirconium oxide has a high m.p. and does not change physically at the temp. generated in welding and that the zirconium oxide has the same coefft. of thermal expansion as metals and when said zirconium is coated on a steel plate, the coated film thereof is hardly strippable and has good adhesion. The zirconium oxide has small affinity to metals, has weak adhesion power to a molten metal so that the removal thereof is easy. The zirconium compd. stabilizes the arc and permits easy formation of slag. The zirconium compd. is exemplified by zirconium hydroxide, basic zirconium carbonate, zirconium stearate, etc. The zirconium oxide or zirconium compd. is used by using other inorg. pigment according to need in 50-90w% zirconium oxide or zirconium compd., compounding water, a solvent and a synthetic resin therewith and preparing the mixture into a past or paint form.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-resistant spatter adhesion inhibitor that prevents adhesion of spatter around the welding area that occurs when welding or fusing metal materials.

During the manufacturing process of ships, bridges, buildings, and other types of machinery, when welding and cutting are performed, if molten metal scatters and adheres to the area around the welding or cutting, rust will occur in the attached area. It is easy to paint, and even if you apply paint on top of it,
Since rust cannot be prevented from forming, it must be removed, but since the adhesion is strong, tools such as a disc grinder or chisel must be used to remove it. .

Since this work requires a considerable amount of labor and time, it is common practice to apply a spatter adhesion prevention agent to the steel plate in advance, and then weld and fuse the plate.

Conventionally, such scum locust adhesion prevention agents have generally used a dispersion of an inorganic pigment such as acid clay, titanium oxide, or calcium carbonate and a resin solution, or a resin dissolved or dispersed in a nonflammable solvent or water. , these have a complete lack of heat resistance and are not suitable for heat resistance or multilayer applications.

For heat-resistant and multi-layer applications, a method using molybdenum disulfide as an inorganic pigment has been disclosed in JP-A-53-6274, but molybdenum disulfide has the property of sublimating at 450°C in a rare gas. There is a drawback that molybdenum disulfide, which sublimes due to the high temperature during welding, easily enters the welded part where the metal is molten, increasing the sulfur content of the welded part and causing embrittlement. In addition, in the method disclosed in Japanese Patent Publication No. 48-30533 that uses graphite, since the coating film is mainly composed of graphite (10 to 90%), the graphite coating peels off due to welding heat and the metal melts. If mixed into the welded part, the amount of carbon in the deposited metal will be reduced.

As a result of intensive research into the above-mentioned problem, the present inventor found that the use of a zirconium compound as an inorganic pigment is effective and completed the present invention.

That is, the reason why the present invention uses zirconium oxide or a zirconium compound that produces zirconium oxide by heating as an effective acid compound is that the produced zirconium oxide has a melting point of 2700°C.
The temperature generated around the welding area is as high as 800~150℃.
At 0°C), there is no physical change, and the coefficient of thermal expansion is almost the same as that of metal, so it expands and contracts in the same way as metal, so the zirconium oxide coating that is applied to the steel plate and adheres to it is difficult to peel off and has good adhesion. good. In addition, zirconium oxide has a low affinity with metals, has a weak adhesion to molten metal, and is easy to remove, so welding work is easy in multilayer welding in which welding is performed in layers. Furthermore, zirconium oxide has the property of stabilizing the arc during welding and facilitating the formation of slag, so even if it adheres to the groove surface, it does not interfere with welding work, and in fact produces good results, so it is necessary to use special materials during welding. This is because it has characteristics that do not require consideration.

In addition to zirconium oxide, zirconium compounds that become zirconium oxide when heated during welding or fusing include zirconium hydroxide, basic zirconium carbonate, zirconium stearate, etc. For example, zirconium hydroxide is a basic zirconium compound. At 500-600°C, 3ZrO2.CO2@nH2O3zr02 zirconium stearate becomes zirconium oxide and exhibits the effects of the zirconium oxide.

It is used in the form of a paste or paint by adding other inorganic pigments and water, a solvent, or a synthetic resin if necessary.

The inorganic pigment used in combination with zirconium oxide or a zirconium compound in the present invention is calcium carbonate, silica, titanium oxide, calcium silicate, etc., and is used in an amount of 1 to 50%. These carbonates, oxides, and silicates have the effect of promoting the adhesion of the spatter adhesion prevention agent, and even if it accidentally adheres to the welding area, the peeling resin can be removed by phenol-modified alkyd resin,
Acrylic resin, epoxy resin, methyl cellulose, urea resin, melamine resin, polyurethane resin, etc. 1 to
Use 10%.

Water or a solvent is used as a solvent to impart fluidity to the spatter adhesion preventive agent and make it into a paste or paint form, but water or a solvent is not used for safety reasons. Lichloroethane, trichloroethylene, tetrachloro-1,2 dichloroethane, 1°1.2 trichlorofluoroethane and the like are preferred.

Further, the amount thereof to be blended can be arbitrarily determined within a range that satisfies the above-mentioned conditions for forming the paste-like or paint-like composition.

The method for producing the spatter adhesion prevention agent of the present invention is to stir the pigment in water or a solvent until it is uniformly dispersed in the case of a paste that does not use a synthetic resin, and to add the synthetic resin to water or a solvent in the case of a paint. The pigment is added to the dissolved resin solution and stirred until the pigment is uniformly dispersed.

The thus obtained spatter adhesion inhibitor of the present invention has a sufficient adhesion prevention effect for applications that require particularly heat resistance, such as welding special steels at high temperatures that require preheating, multilayer welding, and fusing. It gives

The effects of the present invention will be specifically explained below with reference to Examples.

Example 1 Using a container with a capacity of 50 (1+ m!) equipped with a stirrer, acid
6- Put zirconium 1502 oxide in a container, then 1,1°1
80f of trichloroethane is placed in a container and stirred for 40 minutes to knead 1,1.1) dichloroethane and zirconium oxide. Next, the remaining 1.1.1) dichloroethane 46F was added and stirred for 15 minutes to sufficiently suspend the mixture to obtain a sputter adhesion inhibitor.

Example 2 Using the same equipment as Example 1, 231 g of zirconium oxide
, put calcium carbonate (particle size 01-1 μm) 152 into a container, then add water 1202, stir for 40 minutes, and then add Aloron 580 (alkyd emulsion, trade name, manufactured by Nippon Shokubai Chemical Industry Co., Ltd.) 15f and Rust Preventive Agent 159 were added and stirred for 15 minutes to fully suspend the mixture to obtain a spatter adhesion inhibitor.

Example 3 Using the same equipment as in Example 1, zirconium hydroxide 150
S' and silica 151F were placed in a container, and then water 9931 was added, stirred for 40 minutes, and thoroughly kneaded. 257V (as described above) was added and stirred for 15 minutes to sufficiently suspend the mixture to obtain a sputter adhesion inhibitor.

Example 4 Using the same equipment as in Example 1, basic zirconium carbonate 1
202 in a container, then add 9Qf of water and stir for 4 hours.
After 0 minutes and sufficient crosstalk, No. 1 potassium silicate (JT
S standard product) 39, Aroron 580 (mentioned above) 252 and water 5
7 g was added and stirred for 15 minutes to suspend, thereby obtaining a sputter adhesion inhibitor.

Example 5 Using the same equipment as in Example 1, zirconium oxide 807,
Put 79 grams of heavy calcium carbonate into a container, 1.1.1
) Add 90 f of dichloroethane, stir for 40 minutes, and thoroughly knead.
Add product name, Dainippon Ink Kagaku Kogyo Hitsugi) 241,
The suspension was stirred for 15 minutes to obtain a sputter adhesion inhibitor.

Example 6 Using the same equipment as Example 1, zirconium oxide 45f1
Place heavy calcium carbonate 451 in a container, add trichlorethylene 1202, stir for 40 minutes to ensure sufficient crosstalk, then add trichlorethylene 6847 and veracasite 1100 (mentioned above) 17.12 and stir for 15 minutes and suspend. The mixture was made cloudy to obtain a sputter adhesion inhibitor.

Example 7 Using the same equipment as in Example 1, zirconium hydroxide 48.
9f, basic zirconium carbonate 48.9f.

Place 6 f of heavy calcium carbonate in a container, add 1,1.1 trichloroethane 1209, stir for 40 minutes and thoroughly knead, then add 1,1.1) IJ dichlorothane 58.5 f, veracasite 1100 ( Previous) 17.
IV was added and stirred for 15 minutes to suspend the mixture to obtain a sputter adhesion inhibitor.

Example 8 Using the same equipment as in Example 1, zirconium oxide 402,
Zirconium hydroxide 40f1 silica 26-9=y, titanium oxide 62, heavy calcium carbonate 20y1 tyrene 302, and peracasite 1100 (described above) 27V were added and stirred for 15 minutes to suspend, thereby obtaining a spatter adhesion inhibitor.

Comparative Example 1 Using the same equipment as Example 1, magnesium oxide 150
f, 302 kg of titanium oxide, and 1.59 kg of heavy calcium carbonate were placed in a container, 120 kg of water was added, and the mixture was stirred for 50 minutes to thoroughly knead and suspend to obtain a spatter adhesion preventive agent.

2.Pour 60 liters of Perakasite 1100 (mentioned above) into a container, add 180 liters of 1,1.1) dichloroethane, and
Stirring was performed for 50 minutes to thoroughly knead the mixture to obtain a spatter adhesion inhibitor.

Performance evaluation test of anti-spatter adhesion agent Surface sanded, size 400 x 165-1
Mild steel (8841) between 0 = ×19 was used as the base material, and the anti-spatter adhesion agents of Examples 1 to 8 and Comparative Examples 1 to 2 were applied to approximately 150 mm on both sides of the butted base material and the groove part. After air-drying for 1 hour, carbon dioxide arc welding was performed using a welding wire (JIS Y eW, diameter 1.2 φ) under welding conditions of 260 A welding current, 25v1 welding voltage, and 6 layers of deposited metal. After welding is completed, the condition of the coating film on the surface coated with spatter adhesion prevention agent and the number of spatter adhesion near the weld line over the entire length of 400 mm are investigated, and the influence of the spatter adhesion prevention agent applied to the groove surface is investigated using X-ray transmission method. The number of pits and blowholes in the metal was measured and investigated. These results are shown in Table 1.

As shown in Table 1, Examples 1 to 8 had good adhesion with no peeling of the paint film, no adhesion of spatter, and no pits or blowholes in the weld metal, and the X-ray transmission test was grade 1. Met.

In Comparative Examples 1 and 2, there was partial peeling and peeling near the weld line, and spatter was also attached and difficult to remove. Further, Comparative Example 2 had good results, but Comparative Example 1 had pits and blowholes in the welded metal, and the X-ray transmission test was grade 2.

Table 1 *I Patent applicant according to JIS Z 2343
Nihon Yushi Co., Ltd.

Claims (1)

[Claims] A sputter adhesion prevention agent whose active ingredient is zirconium oxide or a zirconium compound that generates zirconium oxide when heated.