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Volume 24, Issue 7
Displaying 1-8 of 8 articles from this issue
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K. Ono, K. Watanabe1955 Volume 24 Issue 7 Pages 241-244
Published: 1955
Released on J-STAGE: December 10, 2009
JOURNAL FREE ACCESSThe relation between corrosion attack in boiling Strauss' solution and heat treatment of stainless steel (SEC 15) parts was investigated. The results obtained are as follows.
(1) In the corrosion tests, having no change of dimension but indicating the differential effect of corrosion due to heat treatment, Strauss' solution as corrosive is superior to HNO3.
(2) Though it is the most desirable for corrosion resistivity that solution treatment above 1, 000°C is designed after welding, as-welded or stress relieved condition below 500°C is tolerable, and weldment shall not be treated at temperatures from 600°C to 900°C.
(3) In corrosion test by Strauss' solution the line of fusion is more corroded than the heat affected zone, and the welded specimen treated at 700°C is attacked most severely.View full abstractDownload PDF (5710K) -
H. Suzuki1955 Volume 24 Issue 7 Pages 245-250
Published: 1955
Released on J-STAGE: December 10, 2009
JOURNAL FREE ACCESSIn the second report, a mathematical analysis of temperature distribution during flash welding is presented to discuss satisfactorily the establishment and the form of the stabilized temperature distribution, and to introduce mathematically the fundamental non-dimensional parameters which are essential in correlating the temperature data in various metals and alloys. Linear, parabolic as well as the general flashing patterns are discussed. The fundamental parameters are: Ψ=(T-T0)/(Tm-T0), and n=(na/kn)1/(2n-1)ξ, where T is the temperature, T0 the initial temperature, Tm the melting point of the material being flashed, and ξ is the distance from the instantaneous flashing interface, k the thermal diffusivity, n and a are constants to determine the displacement of moving platen with a relation Xp=atn, t being the time from the start of flashing.
In parabolic flashing, η=(gp/k2)1/3ξ where gp is the platen acceleration. The effect of cooling by the clamping jaws is the more pronounced when a parameter: η1=(gp/k2)1/3(l0-Bc+vD) is the smaller, where l0 is one half the initial clamping distance, D the diameter or thickness of speciamen, v=1/2 for round and v=1 for rectangular sections, and Bc the critical burn-off per specimen. The critical burn-off is estimated with: Bc=(gp/k2)-1/3.
It has also been shown that the effect of heat of transformation in steels is negligible, and a reasonable and theoretical determination of the average value of thermal diffusivity over the temperature range from room temperature to melting point, has been proposed.View full abstractDownload PDF (404K) -
I. Onishi, Y. Kikuta1955 Volume 24 Issue 7 Pages 251-258
Published: 1955
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn the previous paper, the authers reported the results of experiment on the relation among the volume of the potential hydrogen in electrode coatings, the partial pressure of hydrogen in arc atmosphere and the dissolved hydrogen in deposit metal, using 4 kinds of experimental electrodes. And the following conclusions have been obtained;
(1) The more the potential hydrogen in coatings is contained, the more the partial pressure of hydrogen in arc atmosphere and the volumes of the dissolved hydrogen in deposit metal increase, provided same type electrode coatings are used.
(2) When the different types of coatings, for example, limestone type and deoxide type are compared, more partial pressure of hydrogen and the more volume of dissolved hydrogen in deposit metal collected with glycelin method are indicated in the latter case than in the former case, while almost same volume of potential hydrogen in coating is contained in both types. And when potential hydrogen in coating is changed to the hydrogen component in atmosphere by the lime type, it is diluted with CO and CO2 produced from limestone, while by the deoxide type, its dilution was much less than that by the limestone type.
In this report, anthers used many of commercial electrodes manufactured and used for industrial purposes in Japan, and made experiments by almost same process as these in the previous report, except that process of cellecting method of dissolved hydrogen in deposit metal. The dissolved hydrogen was extracted in mercury at 240°C, 24-48 hr., instead by the glycelin method.
The characteristics of coating were almost same with these shown in report 1.
The results of experiments were almost same with these shown in report 1. The characteristics of coating were distinct only low-hydrogen type was used. When other types were used, their characteristics were not clear, mainly because the compenents of coatings and the volume percent of them were not reported by the manufacturers in public.View full abstractDownload PDF (675K) -
T. Naka1955 Volume 24 Issue 7 Pages 258-267
Published: 1955
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSAuthor's papers on anistropic mechanical properties of structural rolled steels were already presented as prereports to the annual meeting of the Architectural Institute of Japan, May 1954, which were distributed to the members of IIW through Commission No.15, as Doe. XV-28-54. after Florence Meeting in this year. Rolled steels have smaller reliability of mechanical properties in their thickness direction, while it is the natural way that the economical welded connections of steel structures are reduced to use rolled steel plates loaded normally to their rolled surfaces. In such cases the safety of structures should be considered from the point of view of anistropy of rolled steel plates used.View full abstractDownload PDF (10297K) -
K. Kawakatsu, T. Yamaguchi, R. Kawarago1955 Volume 24 Issue 7 Pages 268-275
Published: 1955
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSThe residual stresses of the Unionmelt arc welded pressure vessel were measured on the longitudinal and circumferential weld lines. For the longitudinal seams, the same measurement was made after the 2.5 hours annealing at the temperature of 625±25°C, and tested the effect of stress relief by annealing.
For the thick plate such as this test drum, the residual stresses are triaxial and have certain distribution in the direction of thickness. Therefore, the successive slicing method, developed by D. Rosenthal and J. T. Norton, was used for this investigation.
As the result of measurement, the residual stresses of maximum about 50kg/mm2 was found in the both longitudinal and transverse directions df the interior of the longitudinal weld lines. These stresses were diminished to abut 10kg/mm2 by annealing.
In the interior, the residual stresses on the circumferential weld lines are about 20kg/mm2 in tension. This value is less than those of the longitudinal weld line ; on the both surfaces, they are in compression.
The residual stresses in the direction of thickness are highest in the middle part but they are very small and less than 1 kg/mm2.View full abstractDownload PDF (500K) -
[in Japanese]1955 Volume 24 Issue 7 Pages 276-280
Published: 1955
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (7509K) -
1955 Volume 24 Issue 7 Pages 281-284
Published: 1955
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (338K) -
[in Japanese], [in Japanese], [in Japanese]1955 Volume 24 Issue 7 Pages 285-290
Published: 1955
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (544K)
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