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Volume 28, Issue 6
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1959 Volume 28 Issue 6 Pages 364-370
Published: June 25, 1959
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (2831K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1959 Volume 28 Issue 6 Pages 371-377
Published: June 25, 1959
Released on J-STAGE: June 12, 2009
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Microscopical Observations of the Structural Changed Layers of the Worn SurfaceS. Ito, K. Honta, K. Ishiyama1959 Volume 28 Issue 6 Pages 378-383
Published: June 25, 1959
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSThe high frictional temperature and mechanical work during dry rubbing of steel produce gross structural changes of the surface layers.
Microscopical observations by the taper sectioning method and micro hardness tests have been performed on these layers.
The structural changed layers may be classified to three different types.
That is, an oxide layer, a heat transformed layer, and a ruptured grain layer.
The worn surfaces include the complex combinations of these types.
The oxide layer is very hard and brittle, and exhibits gray colour etched with an alcoholic solution of 2% nitric acid under micdoscope.
The heat transformed layer is yellow or brown etched with alcholic solution of 2% nitric acid, and often has lamina texture.
The formation processes of these layers were determined.View full abstractDownload PDF (9464K) -
1959 Volume 28 Issue 6 Pages 383
Published: 1959
Released on J-STAGE: June 12, 2009
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M. Watanabe, K. Kamachi, Y. Mukai1959 Volume 28 Issue 6 Pages 384-390
Published: June 25, 1959
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSSome experiments were made about the transition of morphology of fractured parts of Zn against temperature.
Single crystals and poly-crystalline specimens were fractured by tension test startically at various temperature, and the fractured part were observed with microscope and Xray diffaction methods.
We found that deformation twins are often produced after cracking, and cleaved plane of single crystal are suffer considerable plastic deformation. And the maximum peak of fracture stresses when they are plottes aginst temperature, is correspond to the transition point.View full abstractDownload PDF (10325K) -
S. Ohta1959 Volume 28 Issue 6 Pages 391-395
Published: June 25, 1959
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn this report, the author explains the compressive test results of the inclined fillet weld, discusses them in comparison with the tensile test results reported formerly and L. J. Vandeperre's test results, and intends to show that both tensile and compressive strengths of the inclined fillet weld can be explained well by the internal friction theory.
The relation (experimental) between α and the inclination of the breaking surface of inclined fillet weld (α=0°(end fillet)-90°(side fillet) ) under the tensile and compressive loads seems to approximate to the theoretical value by the internal friction theory (angle of friction φ=5°(tension) and (-) 45°(compression) ). Assuming that the tensile strength equals to the compressive strength of the side fillet weld, and that in tensile load, the smaller the angle α, the larger the frictional resistance between plate and strap, and correspondingly there is a substantial increase in the strength of the joint, by referring to Dr. Van der EB's test results, both tensile and compressive strengths of the inclined fillet weld will be well explainable by the internal friction theory.View full abstractDownload PDF (293K) -
Polyvinyl Chloride and PolyethyleneI. Onishi, H. Kimura, H. Urata1959 Volume 28 Issue 6 Pages 396-400
Published: June 25, 1959
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn order to secure the best conditions of plastic welding, two kinds of plastics, polyvinylchloride and polyethylene which are widely used in the industry, were choosen. They were welded in several conditions of welding. temperature, welding velocity and welding gas pressure. The tensile test have been done with these specimens. The results of these experiments are comsidured to show that these plastics has a tendency to have maximum strength at certain temperature and gas pressure, as shown in Fig. 2, 3.
As to the effects of acid and irradiation in various welding conditions, polyvinyl chloride has been affected more than polyethylene.View full abstractDownload PDF (281K) -
T. Toshida, T. Abe, H. Onoue1959 Volume 28 Issue 6 Pages 401-407
Published: June 25, 1959
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIt is a very valuable subject to study how at ease we can weld or operate with a specific welding electrode, and there may be many different opinions as to the factors of "USABILITY" of welding electrode, if we so call it.
We have tried to clarify such factors of "usability" of welding electrode, though with difficulties, and according to our investigations it is considered that "fluidity of slag" (fluid condition of slag), amongall, has very close relations with the usability of welding electrode.
One of our investigations about the usability, therefore, has been directed to the molten slag of welding.
For this purpose we took a 50-frames-per second 16 mm colour film, to closely observe the fluid condition of welding molten slag. The several electrodes with typical types of coating, i.e. iluminite, high cellulose, rutile, low hydrogen, high iron oxide and iron powder, and some other electrodes on the market were presented for filming.
In these photographs, the characteristics of each molten slag in its fluidification and solification called our great interest. Especially, rutile and low hydrogen type electrodes showed the extremes in fluidity.
Furthermore, using the low hydrogen type electrode which are not so good in usability, the aspect of molten slag was found as remarkably distinguished from the others.
We thus could reach a conclusion that the fluid conditions of molten slag was connected with physi-cal properties, such as viscosity, surface tension and specific gravity at various temperatures, and also with the solidificable and the fluidable temperature.
The ESAB OK-53P double coated electrode is known as being able to effect the complete "back wave welding" without back sealing run on the Vee Groove joint. This complete back wave welding could also be well understood by observing the specific feature of the aspects of the molten slag in our movie.View full abstractDownload PDF (1557K)
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