JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 41, Issue 8
Displaying 1-5 of 5 articles from this issue
  • 1972 Volume 41 Issue 8 Pages 865
    Published: 1972
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Hajime Nakamura
    1972 Volume 41 Issue 8 Pages 866-900
    Published: 1972
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Kiyoshi Terai, Yoshio Nagai, Tamio Kurose
    1972 Volume 41 Issue 8 Pages 901-914
    Published: 1972
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • On the Heel Cracking
    Jinkichi Tanaka, Toyofumi Kitada
    1972 Volume 41 Issue 8 Pages 915-924
    Published: 1972
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Heel crackings occurring from the root of T -joint are often found in fillet welds of 50 kg/mm2 grade high strength steels. These crackings constitute a serious problem for the fillet weld of these steels. These crackings can be reproduced in laboratories by a, non-restraint T-type cracking test method. With a view to determining the nature and causes of heel cracking formation, we conducted various experiments. The test results obtained are summarized as follows:
    (1) Heel cracking is one of the hydrogen induced crackings and shows the tendency of delayed cracking.
    (2) As to the stress causing heel cracking, the mismatching of vertical pate caused by the thermal expansion and shrinkage must be taken into consideration.
    (3) As a factor representing the sensitivity of 50 kg/mm2 grade high strength steels to heel cracking, PN value is proposed.
    (4) Decarbonized surface layer of steel plate is effective for preventing heel crackings, which indicates that as-rolled steels are more crack-sensitive than the normalized steels and the quenched and tempered steels.
    (5) Heel crackings are different from lamellar tears usually considered.
    (6) Electrodes with low hydrogen content and low yield strength are effective for the prevention of heel crackings.
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  • Shigeru Kitahara, Isao Okane, Atsushi Hasui
    1972 Volume 41 Issue 8 Pages 925-930
    Published: 1972
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    The press-sintering process of the sprayed coating to improve the denseness and the bonding of the deposited coating has been developed. This new process is superior to the conventional fusing process in which the structural change and the thermal strain of the substrate take place during the treatment. Then, the press-sintering process is applied to a Nickel base self-fluxing alloy coating deposited by oxy-acetylene flame spraying process. Some properties of the press-sintered coating are also investigated.
    In conclusion, it is clear that the coating, sintered under suitable pressing, has almost the same denseness and bonding as the fused coating, and a higher wear resistance than the fused one.
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