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Volume 25, Issue 11
Displaying 1-10 of 10 articles from this issue
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C. Matsuda, M. Motoki, S. Yamazoe1956 Volume 25 Issue 11 Pages 599-600
Published: November 25, 1956
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn our previous report, it was first clarified that the radio noise was considerably generated during arc welding, arc cutting and oxy-arc cutting. Similar measurements of radio noise were carried out on arc welding machine with high frequency, the results of which are described here. The work performed are summarized as follows:
(1). Intense interfering radiation is produced at a wide frequency range during inert gas arc welding by airc welding machine with high freauencv venerated by spark gap oscillater.
(2). Field intensity of the radiation is almost inversely proportional to the square of the distance frome the noise source.
(3). Intense interfering terminal voltage is similarly produced in the distribution line and it is scarcely reduced by the use of a condenser.View full abstractDownload PDF (151K) -
Distribution of Fisheyes and Correlation between Fisheye and Tensile PropertiesS. Ando, S. Mori1956 Volume 25 Issue 11 Pages 601-608
Published: November 25, 1956
Released on J-STAGE: December 10, 2009
JOURNAL FREE ACCESSOn the tensile test specimens of ilmenite type arc welding electrodes for mild steele (4 and 5mm dia) which were tested in accordance with JIS G 3524 in the Report 1 authors further analysed statistically distribution of fisheyes and correlation between fisheye and tensile properties. The results are summarized:
1. If the size of fisheye is indicated by the diameter which is derived from the total area of all fisheyes, found in a fractured surface of test specimen, distribution of fisheyes and correlation between size of fisheye and tensile properties can be fairly well represented.
2. In very few electrodes, fisheyes are absent, and there is a slight stronger tendency for 5mm dla to develop fisheyes than 4mm dia.
3. There is an evident negative correlation between fisheye and elongation or reduction of area, but a less evident such relation, between fisheye and tensile strength or yield point. These correlations clearly indicated especially with contour ellipses.View full abstractDownload PDF (4248K) -
On the Idea of this ProcessH. Sekiguchi, I. Masumoto1956 Volume 25 Issue 11 Pages 608-611
Published: November 25, 1956
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSThe Carbon Dioxide-Sekiguchi's Filler Wire-Arc Welding Process, C. S. Arc Welding Process for short, is the carbon dioxide gas shielded metal arc welding process with steel filler wires containing deoxidizers, namely Sekiguchi's filler wires.
The idea of this process is as follows.
(1) The use of carbon dioxide gas to shield the electric arc and molten metals being in transfer and deposited.
(2) The use of bare steel filler wire containing deoxidizers, namely Sekiguchi s filler wire.
The following things are expected on this process. Bad effects of Oxygen and Nitrogen in the atmosphere are reduced to some extent by the use of carbon dioxide gas. On the filler wire, there is no coating which may have a provability of supply water vapor. Then hydrogen content of the weld metal is very little. The contents of iron oxide (FeO), produced by the dissociation of carbon dioxide at high temperature and the reaction between molten iron and the shielded gas, is reduced with deoxi dizers come from Sekiguchi's filler wire. Accordingly, contents of oxygen, nitrogen and hydrogen of the weld metals obtainek by this process are extremely little. Therefore, excellent welded joints are made by this process.
It was confirmed experimentally that the idea of this process is excellent. Next reports on this process will show the results of these experiments.View full abstractDownload PDF (336K) -
H. Suzuki, T. Murase1956 Volume 25 Issue 11 Pages 612-618
Published: November 25, 1956
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSVarious tests on the inert-gas metal -arc welding of a corrosion resisting aluminum-manganese alloy "ANP", have been performed with ANP-O and ANP-1/4H plates, 1/4 in. in thickness, and various.consumable electrode wires, 52S, A54S, 56S and ANP. The present report Part 2 discusses the effects of welding conditions, surface treatments, filler wires, preheat and back-chipping on the occurence of porosities in bead weld or buutt weld, as well as the cracking tendencies of various filler wires in welding a slit-type cracking specimen.
The essential factors to prevent porosities have been shown to be; chemical cleaning of filler wire, adequate arc length, higher heat input, less magnesium content, proper backing and precautions in the back pass, that is, back-chipping, slower welding speed or preheat. Electrode wires, ANP and A54S, were the least crack-sensitive.View full abstractDownload PDF (8179K) -
Special welding method for protecting penetrationI. Onishi, H. Nobuhara, T. Goto1956 Volume 25 Issue 11 Pages 618-621
Published: November 25, 1956
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSWhen the mild steel is surfaced with high alloy steel by welding, the penetration of overlayered metal into mother metal is so deep that the overlayered metal is diluted and damaged its mechanical properties. This report shows how to proteat the dilution of overlayered metal by mother metal.
Here are several method deviced for this purpose. Among them, it was confined that the mother metal coating method, had shown the best results. In this method, mother metal is coated with the powdered, or the coating flux which are riched with alloying element (for example, Ferro-manganese powder) and the arc which is generated between two mild steel welding rods connected to one A. C. welder is used for melting and alloying coating flux and molten metal from two welding rods on the surface of the mother metal, but the heat energy of arc is scarecely used for melting the mother metal and then the penetration is little here are some data and results as regard to these method but these experiment is on the way. Thence more development is hoped.View full abstractDownload PDF (2183K) -
The Effect of Testing Speed on Hydrogen BrittlenessI. Onishi, Y. Kikuta, K. Kawai, M. Kakuno1956 Volume 25 Issue 11 Pages 623-628
Published: November 25, 1956
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn the previous paper, authors reported the results of a few experiments on hydrogen brittleness of mild steel. In this paper, authors reported mainly the effect of testing speed on hydrogen brittleness.
(1) Hydrogen was charged in mild steel specimens by cathodic electrolysis (5% H2SO4 and with catalyser a few drops of P+CS2 solution were used).
(2) Partially charged specimens were tested for the depth and the degree of brittle part in the specimens.
(3) Tensile and bending tests were carried out in accordance with the three kinds of testing speed, i.e., statically (6mm/min, 150mm/min) and dinamically (Charpy Impact).
In consequency of these tests, ratio of reduction in area and elongation on tensile test, and lateral contraction and absorbed energy on bending tests were remarkably decreased inaccordance with increase of charging hours, and in the case that charging hour was more than two hours (about 7ccH2/100gr-Fe), testing results were almost settled. It is interested that under high testing speed, these decreases of reduction in area and etc. were not so remarkable. The degree of hydrogen brittleness becomes remarkably when slower testing speed was used.
(4) In the case that the specimens were aged up 4 days after charging, the ductility of the specimens was almost recovered to that of virgin specimen when pre-strain had not given, besides the ductility was hardly recovered when suitable pre-strain was given.View full abstractDownload PDF (2238K) -
M. Watanabe, K. Kamachi, Y. Mukai1956 Volume 25 Issue 11 Pages 628-634
Published: November 25, 1956
Released on J-STAGE: July 14, 2010
JOURNAL FREE ACCESSUsing X-ray, measurement of the degree of plastic deformation about charpy impact tention tested specimen were made, from the point of view that the difference of the values of absorbed energy on brittle transition curve must be due to the difference of mechanism of plastic deformation, hence the energy for it, when the specimens were fractured at various temperature.
Just the side of fractured were exposed by X-ray beam, monochromated with LiF crystal, and back-reflected Debye rings from (310), (220), and (211) planes were recorded on rotating films, whilst same rings from fractured surface, on startic films.
Then the broadening of Debye rings were measured using microphotometer.
The half peak maximum were plotted against fractured temperature. Moreover, Debye rings on cylin-films were taken, and the half peak maximum of them were plotted against Bragg angle. drical Thus, consideration were made about these results.View full abstractDownload PDF (5874K) -
T. Yosida, W. Matsunaga, K. Terai1956 Volume 25 Issue 11 Pages 634-641
Published: November 25, 1956
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn the previous report authors have decided the practical use of 47mm thick ship steel plates, basing on the investigation made from the view point of the performance of the plates and weldment of the upper deck construction of 45, 000 DWT ore and oil carrier.
In this paper we report the result of joinability tests of 40mm and 47mm steel plates when they are welded.
In welding such thick steel plates, the first problem we meet is the crack sensitivity of the weldmeut and the deflection of the welded joints, so for the experiment we selected the following two tests and applied them in equal manner on steel plates of thickness, 25mm, 30mm, 40mm, and 47mm, respectively.
1. Lehigh restraint test (cf. Fig. 2)
2. The measurement test of the deflection of welded joint. (cf. Fig. 3, 4)
By these tests we could obtain each of the following conclusions.
As it may be evid nt, in the joinability of 40mm and 47mm thick plates we noticed a quite different tendency in comparison with that of the plates whose thickness is either 25mm or 30mm.
(1) So far as we make it a problem the crack of the bead of the first layer, the extent of the employment of ilmenite type electrode is restricted according to the thickness of the plate.
In such case if the thikness of plates be 40mm or 47mm, it is very difficult to prevent crack, no matter whether the preheating practice have been applied or not. (cf. Fig. 2)
(2) By using the low hydrogen type electrodes it is very effective in preventing restraint crack even when the thickness of the plates goes up to 47mm. (cf. Fig. 2)
(3) So far as the deflection of the welded joint is made a problem, when the plate thickness is either 25mm or 30mm, the ratio of the depth of the final pass side and backing pass side may be 2: 1(or 7: 3). In this case the deflection is hardly affected by the welding position. (cf. Fig. 6, 7) (4) When the plate thickness is either 40mm or 47mm, the deflection receives a large effect by the welding position. In the case of the butt joints of upper deck assemblies (backing pass side : overhead position, final pass side : flat position) the ratio of the depth is desirable to make 1: 1. (cf. Fig. 5, 6, 7)
Besides, for the supplement (Appendix) we attached the record of welded joint (cf. Fig. I, II, III, IV and Table A) and others (cf. Fig. V, VI).View full abstractDownload PDF (12430K) -
[in Japanese], [in Japanese], [in Japanese]1956 Volume 25 Issue 11 Pages 642-644
Published: November 25, 1956
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (3637K) -
[in Japanese]1956 Volume 25 Issue 11 Pages 645-650
Published: November 25, 1956
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (402K)
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