JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 23, Issue 1-2
Displaying 1-7 of 7 articles from this issue
  • K. Ono, K. Watanabe
    1954 Volume 23 Issue 1-2 Pages 3-12
    Published: 1954
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    Cr-Ni austenitic stainless steel electrode wire were welded by submerged arc welder. In this case as the welding composition, grade 90 and 20 flux made by Linde Air Product Co. were used, and 18-8-Cb, 20-10-Mo, 17-13-Mo and 26-23 Cr-Ni welding rods made in our laboratory and comercial mild steel and two kinds of stainless steel mother plate were used on trial. Research on penetration, hardness and microstructure at welded part by single bead, recovery of hardness at heat affected zone by annealing, strength of austenitic stainless steel junction and mechanical properties and corrosion resistance of austenitic stainless steel weld metals was carried out.
    The results obtained are as follows:
    (1) Each single bead by submerged welding has very fine appearances and hardness of austenitic stainless steel is nearly equal to that of the austenitic steel mother plate, but is increased by being poor of Cr and Ni on welding to mild steel and 13 Cr stainless steel. In order to reduce the maximum hardness on heat affected zone and weld metal, it is necessary to be annealed and to be welded by the use of high Cr-Ni austenitic stainless steel electrode wire such as 26 Cr-23 Ni. Both penetration and amount of deposited metal on welding to stainless steel plate are larger than the mild steel.
    (2) From the mechanical test of junction it was recognized both I and V butt welding are good, and grade 90 flux is superior to grade 20 one, and 22 Cr-10Ni-Mo is most desirable in all electrode wires. This result is nearly equal to that of manual weld.
    (3) Mechanical properties of weld matal are not inferior to that by manual welding and it was known that grade 90 flux is somewhat excellent after mechanical test of weld metals, While acid resistivity of weld metals prepared by using grade 20 is excellent especially in H2SO4, except in HCl, but some stress corrosion cracks were seen on the specimens occasionally.
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  • M. Okada, Y. Arata
    1954 Volume 23 Issue 1-2 Pages 13-22
    Published: 1954
    Released on J-STAGE: July 14, 2010
    JOURNAL FREE ACCESS
    Fundamental researches upon the deterioration of mechanical strength owing to the graphitization in weld heat-affected zone has been done, and reported in this paper.
    Theorical foundation and experimental verification are as follows;
    1) The following reaction was confirmed from the result of the magnetic research of quenched carbon steel during tempering.
    2Fe2C→Fe3C+Fe+C
    2) The fact that weld heat-affected zone preferentially graphitized was theoretically explained from above-mentioned reaction.
    3) The formation of chain graphite was confirmed and its forming mechanism was explained in detail.
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  • Effect of Heat-Treatment on the Rimmed and Killed Steel
    N. Nagai, T. Owa, T. Godai
    1954 Volume 23 Issue 1-2 Pages 23-28
    Published: 1954
    Released on J-STAGE: December 10, 2009
    JOURNAL FREE ACCESS
    There are several methods to judge the weldability, but the results determined by some method does not coincide necessarily with the result by the other method. The authors want to investigate the relation among the results of different methods about the brittleness of Heat-affected zone, and the results attained will be reported in the succeeding announcements. In the experiments Izod impact test, Hardness measurement, Microscopic and Xray observations are used, and the new method of Izod impact test revieled some interesting facts about the methods judging weldability of welded part.
    In this report, as the fundamental test, the variation of properties by heat-treatment about Killed and Rimmed steels are investigated.
    As the results of this experiment it was concluded that:
    1) Rimmed steel of low carbon content became most brittle state by the water quench from 700°C., and Killed steel by the same quench from 800°C.
    2) The most brittle state attained by 700°C. water quench will mainly be caused by the precipitation of carbide from Ferrite super-saturated with carbon, and the brittle ness after 800°C. water quench is mainly caused by the fundamental variation of the microstructures of Eutectoid.
    3) Oxygen in steel accerelates extremely the precipitation and coagulation of cabide.
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  • Brittlfying by Single Bead Weld
    N. Nagai, T. Owa, T. Godai
    1954 Volume 23 Issue 1-2 Pages 28-35
    Published: 1954
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    In this experiment the authors investigated the true reasons causing the brittleness in the range of heat-affected zone by observing Izod impact test, hardness measurement and Xray diffraction method in the single bead weld, and compared the states of the brittleness about both Killed and Rimmed steel. As the result it was recognized that the main factor to cause brittleness is the precipitation of super-saturated carbon in ferrite grain, and that state is used to caused by the rapid cooling from the neighbour-of A1 transformation point, and the most brittle part of Killed steel seems to somewhat above A1, Rimmed steel somewhat below A1, i. e. the mechanisms causing brittleness are somewhat different. The brittleness of Rimmed steel is more predominent than Killed steel.
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  • M. Otani, S. Ota
    1954 Volume 23 Issue 1-2 Pages 35-40
    Published: 1954
    Released on J-STAGE: December 10, 2009
    JOURNAL FREE ACCESS
    A longitudinal bead was laid on the surface of kahn tear test piece to investigate the effect of manual arc welding on the notch sensitivity of structural mild steel plates.
    The saw cut was located perpendicular to the deposited bead to evaluate the notch sensitivity of welds when a crack, originated in the heat-affected zone, propagates toward the base material. Welded plates generally showed higher transition temperatures than unwelded plates, ranging from 5 to 14°C in 13 mm thick plates and 1 to 11°C in 23 mm thick ones. These adverse effects of welding were almost the same when the crack propagated along the heat-affected zone. Accordingly, it is reasonable to conclude that the fracture transition temperature is nearly determined by the starting condition of brittle failsure with a rapid velocity of propagatian.
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  • Change in Residual Stresses by Natural Aging
    T. Kobayashi
    1954 Volume 23 Issue 1-2 Pages 40-42
    Published: 1954
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    The welding residual stresses at the Point 1 and 4 in the mild steel rectangular specimens, which had a weld bead along one edge as shown in Fig. 1, were measured seven times between one and 180 days after welding by the X-ray diffraction method.
    The relaxation of residual stresses by natural-aging was not almost found from the results of the experiment contrary to the expectations.
    The results are shown in Fig. 2 and 3.
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  • 1954 Volume 23 Issue 1-2 Pages 47-48
    Published: 1954
    Released on J-STAGE: June 12, 2009
    JOURNAL FREE ACCESS
    Download PDF (83K)
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