JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 40, Issue 5
Displaying 1-4 of 4 articles from this issue
  • 1971 Volume 40 Issue 5 Pages 353-440
    Published: May 25, 1971
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Ichiro Kawakatu, Tadashi Osawa
    1971 Volume 40 Issue 5 Pages 441-447
    Published: May 25, 1971
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    The joint strength of metals is usually tested by various methods, tensile, shearing, peeling, bending, impact and so on, but it is considered risky to judge the joint strength from only one kind of testing, because each testing has a characteristic. An investigation of soldered joint strength was undertaken to study on the peeling strength, that was most useful for inspecting the brittleness or toughness of the thin plate joint, in soldering of tin and zinc coated steels. The results obtained are as follows:
    (1) Peeling strength of soldered joint did not depend on soldering area and soldering clearance but on soldering width.
    (2) Peeling strength of soldered joint on tin cozated steel was dependent on tin content of the applied solder, being minimum at eutectic composition. An opposite relation was found between hardness or tensile strength of solder itself and peeling strength of soldered joint on steel and tin coated steel.
    (3) Peeling strength of soldered joint on zinc coated steel showed nearly a constant value of 0.38 kg/mm, independently of tin content of solder.
    (4) It was clarified that peeling mechanism of soldered joint on tin coated steel was different from zinc coated steel, the former peeled off the interface between solder and metallic compound FeSn2 formed in soldering process, and the latter off the metallic compound FeZn7 formed in zinc coating process.
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  • Fundamental Study on the Nitrogen Absorption by Fe-Cr-Ni Weld Metals (Report 3)
    Takuro Kobayashi, Takeshi Kuwana, Yasushi Kikuchi
    1971 Volume 40 Issue 5 Pages 448-458
    Published: May 25, 1971
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    The nitrogen contents of Fe-Cr-Ni weld metals deposited in the atmosphere of nitrogen or air were systematically determined. Some of them were compared with the solubility of nitrogen in the alloys concenred. The extent of porosity was also investigated. The main results are summarized as follows:
    1. The nitrogen contents of weld metals were shown as a function of the sum of chromium and nickel content.
    2. The nitrogen content of Fe-Cr-Ni weld metals were shown with contour lines of iso-nitrogen content in a ternary diagram.
    3. Comparing the nitrogen contents of the Fe-Cr-Ni weld metals with the solubility of nitrogen determined by Humbert and Elliott at 1600°C, it is found that the high chromium weld metals are not saturated with nitrogen up to the solubility limit.
    4. The blowholes in the weld metals seem to be reduced by increasing the chromium content of electrode wires.
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  • A Theoretical Study of Residual Welding Stresses and Deformations (Report 2)
    Tsugio Fujimoto
    1971 Volume 40 Issue 5 Pages 459-473
    Published: May 25, 1971
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    As an example of the applications of theoretical analysis of residual welding stresses based on the inherent strain, stress distributions in finite rectangular plates with slit-type butt welded joint are presented and compared with experimental results. In this report, the inherent strain distributions along welded joint are mathematically expressed by superposition of the basic functions which depend only upon the distance from an arbitrary point on the welded line. Residual stresses are calculated by applying the inherent stress theory developed in the first report by the author.
    The basic function is obtained as a solution of the Abel's integral equation for the distribution of inherent longitudinal strain in simple butt welded joint. The longitudinal and transverse components of inherent strain are determined by the superposition of the same basic functions, where the density of distribution is assumed to be uniform along welded joint for the longitudinal strain and convex for the transverse strain. The density of inherent transverse strain is determined by trial and error method such that the measured transverse shrinkage along welded joint may coincide with the inherent transverse shrinkage calculated from the inherent transverse strain supposed above. The magnitude of inherent longitudinal strain is determined on the assumption that the residual longitudinal stresses at midlength of joint are equal to the yield stress of weld metal, the value of which is presented in the first report as the result of elastoplastic analysis of welding stresses in simple butt joint.
    The numerical calculation is carried out by means of Fourier seriers., This procedure is a systematic treatment of rectangular plate problems. Figures 4 to 6 show the results of the calculated residual welding stresses in rectangular plates for various slit lengths. The experimental results are also plotted.
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