JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 35, Issue 3
Displaying 1-8 of 8 articles from this issue
  • Kimiyuki Nishiguchi
    1966 Volume 35 Issue 3 Pages 215-224
    Published: March 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Fred L. Plummer
    1966 Volume 35 Issue 3 Pages 225-230
    Published: March 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • T. Embury Jones
    1966 Volume 35 Issue 3 Pages 231-236
    Published: March 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Takuro Kobayashi, Takeshi Kuwana, Yasushi Kikuchi
    1966 Volume 35 Issue 3 Pages 237-245
    Published: March 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Effect of the nitrogen partial pressures in the welding atmospheres of several gas mixtures and welding conditions on the nitrogen content and porosity of mild steel weld metals were studied by using an arc atmosphere controlled chamber. The results were summarized as follows ;
    1. The nitrogen contents of weld metals decrease with increasing welding current.
    2. The anomalous nitrogen absorption into weld metal is observed at low arc atmospheric pressures.
    3. The existence of oxidizing gas in arc atmosphere such as oxygen or carbondioxide con-tributes greatly to the nitrogen absorption into weld metals.
    4. In reducing gas atmospheres such as nitrogen-hydrogen mixtures, the nitrogen contents in weld metals show a tendency to obey the square root law.
    5. Some calculations for the nitrogen absorption into weld metals were made using thermo-dynamic data obtained by an equilibrium study.
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  • Theoretical analysis of contraction process by welding heat flow
    Kunihiko Satoh, Shigetomo Matsui, Masahiro Kobayashi
    1966 Volume 35 Issue 3 Pages 246-256
    Published: March 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    As a part of the research project on weld cracking of mild and high strength steels under hindered contraction, analytical attack was undertaken on the contraction process of weld joint during first-pass welding and cooling. Considerations on the heat flow in first-pass welding of heavy, steel plate show that contraction during cooling is proceeded by both weld metal contraction and decrease in thermal, expansion of mother plates. The latter is rather predominate. Contraction as the results of the decrease in thermal expansion of mother plate consists of two parts. The one is as the results of the decrease in temperature difference along thickness direction, and it is increased with increase of plate thickness (h). The other is as the results of overall heat loss from a part of the plate in a gauge length (l) over which contraction is measured. It is increased with decrease of heat capacity or thickness of plate, and is delayed with increase of gauge length even for a given thickness. As the results contraction is proceeded with different process as affected by thickness and gauge length. Some examples calculated for a usual arc-welding condition of mild steel are shown in Figs. 9, 10, 13 and 14.
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  • Syunzi Yamamoto, Syoziro Shibata, Takashi Sugitaya, Kiyoshi Asami
    1966 Volume 35 Issue 3 Pages 257-270
    Published: March 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Pure Ti and Ti alloy are generally welded by TIG or MIG welding method. Sometimes fine porosities are detected in these welds by a X-ray examination. It seems that these porosities decrease the fatigue strength in some case. So it is important to protect the pure Ti and Ti alloy welds from these porosities. A study was carried out to make clear the effect of the ultrasonic vibration and the electromagnetic stirring on the porosities. At the same time, the effect of these two methods on the grain refinement, the bead shape, the penetration and the spatter were investigated. It was concluded that :
    (1) the ultrasonic vibration
    (i) The porosities of the TIG Welds were reduced by the ultrasonic vibration (9KC, 0.5-2 KW out put)
    (ii) The grains of the MIG Welds were made finer by the ultrasonic vibration (9KC, 0.5-2 KW out put)
    (2) the electromagnetic stirring
    (i) The porosities of the TIG Welds were reduced by the electromagnetic stirring. (DC or 60c/s AC and 2000 AT.)
    (ii) When using the coarse surface welding wire or with the machine oil on the groove surface, the porosities increase. But even in these cases by the electromagnetic stirring the porosities were considerably reduced.
    (iii) The grain of the TIG or MIG welds made finer by the electromagnetic stirring, especially in the Ti alloy MIG Welds.
    (iv) The frequency of the coil current was changed between DC and 60c/s AC The most effective frequency was around 8c/s.
    (v) In case of MIG Welding, the spatter increased with the intensity of the magnetic field.
    (vi) The bead shape was changed according to the frequency of the electromagnetic stirring. The bead was the concave type around 30 c/s, but tended to chahge into the convex type gradually with a decrease of the frequency.
    (vii) The penetration decreased with the intensity of the magnetic field, especially in case of MIG Welding.
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  • Kohei Ando
    1966 Volume 35 Issue 3 Pages 271-281
    Published: March 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    The welders defined in the heading are developed in Japan in recent years. The electrical working manners are explained and discussed on static as well as dynamic characteristic in the limit of the pages allowed for the paper. It is indicated that the self demagnetizing AT generating in the gate windings due to the current passing through the impedance Zp (Fig. 1, 7) is nearly proportional to out put d.c. current In. Equ. (4), (6).
    The basic principle of the demagnetizing action of the various type of circuit Zp shown in Fig. 3 is quite similar in each other though the dynamic characteristics may differe in some types. See equ. (10).
    Diagram of eM, eN, potential of positive and negative d.c. terminal M, N and gate voltage are shown in Fig. 12-23 for several conditions of LD (d.c. side inductance), saturation curve (Fig. 11 (b), (c) etc.).
    The out put characteristics ED-ID are considered in Fig. 24-26, and is suggested that LD may effect to the curve.
    It is indicated that the working manners of static as well as dynamic characteristics of the circuit in Fig. 7 including the control circuit are quite similar to those of the separately excited differential compound generator which has the diverter circuit as shown in Fig. 10, except the point of the transient phenomena of the first half cycle period.
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  • Isao Masumoto, Eiji Kuribayashi, Ichiro Yamada, Masabumi Yasuda, Yuko ...
    1966 Volume 35 Issue 3 Pages 282-289
    Published: March 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Wires for the gas shielded arc welding are usually plated with copper to guarantee the good corrosion resisting property and low electric resisting. property. But there is a problem if this plated copper may have some effects on the welding and the properties of weld metal. The investigation was made to examine the influence of the copper plating on the corrosion of wire, the deposition loss of copper to weld metal and the influence of the copper content on the mechanical properties of weld metal by CO2-O2 arc welding.
    The results obtained were as follows :
    1) Copper plating of more than 0.5μ gives the considerable corrosion resisting even in wet atmo sphere.
    2) There is no deposit loss of copper to weld metal by CO2-O2 arc welding.
    3) If copper plating of wire is controlled within from 0.5, μ to 1.2, μ thick, the mechanical properties of weld metal will not be affected by the copper of wire.
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