被覆原料および被覆剤中の全水分の測定
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概要
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At present, the method published by C.T. Gayley and W.H. Wooding has been utilized broadly on the determination of total water content in electrode coatings. In this report, the total water content in electrode coatings and its materials used generally in the field of manufacturing welding electrode were determined after the discussion on the method. Still more, the absorption velocities of moisture in 90% relative humidity were investigated for some of the low hydrogen type commercial electrode coatings. Results obtained are summerized as follows. 1. On the discussion of the method reported by C.T. Gayley and W. H. Wooding; 1) In this experiment, a quartz glass combustion tube was used instead of the high temperature McDanel combustion tube. When used a rubber stopper at the one end of the tube, it was necessary to cool by tap water, because of considerable amounts of water evolved from the stopper at high temperature such as 1200℃, but it was more succesful to replace it with a ground quartz glass cap. 2) As the air intruded into combustion tube when the stopper was opened to insert the sample into it and gave a considerable error on the results, it was advisable to correct the water content obtained in the case of more than 50% relative humidity. 3) When concentrated sulfuric acid in drying tower was used as a desiccant for oxygen, it gave a drying effect on de-hydrite in "U" tubes, therefore 90% sulfunic acid was replaced. The result was satisfactory as reported by C.T. Gayley and W.H. Wooding. 4) It was necessary to ignite the combustion clay boat (N.T.K.B.) at 1200℃ for about 2 hours for one boat and 4 hours for two boats in the same time. However, the time required to ignite was reduced to about a half by pre-heating the boat with a gas burner. 2. On the determination of total water content in coating and its materials; 1) The determination of total water content in twenty two coating materials were made from air dried condition. 2) Water content of manganese dioxide, asbestos, talc, mica, No. 2 sodium silicate, No. 3 sodium silicate, potassium silicate kaolin, and commercial welding electrode coating were determined at various temperatures for one hour. Above all, the total water content and the temperature necessary to evolve it for mica, talc, and asbestos were higher than the others. 3. Relation between the total water content in electrode coating and the volume of hydrogen evolved from deposit metal was liner for a given electrode. 4. The absorption velocities of moisture in 90% relative humidity for five commercial electrode coatings were different remarkably each other.
- 社団法人溶接学会の論文
- 1956-04-10