JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 47, Issue 8
Displaying 1-9 of 9 articles from this issue
  • Hideo Kitagawa
    1978 Volume 47 Issue 8 Pages 470-473
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Download PDF (342K)
  • Hot Cracks in Stainless Steels and Aluminum Alloys
    Hiroji Nakagawa, Fukuhisa Matsuda
    1978 Volume 47 Issue 8 Pages 474-479
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Download PDF (7291K)
  • Yoneo Kikuta, Takao Araki, Toshio Kuroda
    1978 Volume 47 Issue 8 Pages 479-483
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Download PDF (2020K)
  • Kenji Shinozaki, Hiroji Nakagawa, Fukuhisa Matsuda
    1978 Volume 47 Issue 8 Pages 483-487
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Download PDF (6076K)
  • Yoshihiko Mukai, Masato Murata
    1978 Volume 47 Issue 8 Pages 488-493
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Download PDF (6656K)
  • Effect of Metallurgical Factors on the Deformability of Material at Stress Concentrated Region
    Hiroshi Ikawa, Yoshikuni Nakao, Shigeo Shin, Koji Yuwasa
    1978 Volume 47 Issue 8 Pages 494-500
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    In this study, the effect of metallurgical factors on the deformability of material at stress concentrated region was examined.
    It was made clear that the deformability of material at stress concentrated region was affected by the precipitation behaviors of γ' phase, grain diameter and Mg content.
    Consequently, it is considered that these metallurgical factors affect the post-weld heat treatment cracking susceptibility of Ni-base heat resistant alloys.
    Download PDF (5215K)
  • Yukio Ueda, Eiji Takahashi, Keiji Fukuda, Koichi Sakamoto, Keiji Nakac ...
    1978 Volume 47 Issue 8 Pages 500-506
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    An investigation into mechanical behavior of a multipass welded joint of a pressure vessel during stress relief annealing was conducted. The study was performed theoretically and experimentally on idealized research models.
    In the theoretical analysis, the thermal elastic-plastic creep theory developed by the authors was applied. The behavior of multipass welded joints during the entire thermal cycle, from welding to stress relief annealing, was consistently analyzed by this theory. The results of the analysis show a good, fundamentally coincidence with the experimental findings.
    The outline of the results and conclutions is as follows.
    (1) In the case of the material (21/4Cr-lMo steel) furnished in this study, the creep strain rate during stress relief annealing below 575°C obeys the strain-hardening creep law using the transient creep and the one above 575°C obeys the power creep law using the stational creep.
    (2) In the transverse residual stress (σx) distribution after annealing, the location of the largest tensile stress on the top surface is about 15 mm away from the toe of weld, and the largest at the cross section is just below the finishing bead. These features are similar to those of welding residual stresses. But the stress distribution after annealing is smoother than one from welding.
    (3) The effectiveness ofstress relief annealing depends greatly on the annealing temperature. For example, most of residual stresses are relieved at the heating stage with a heating rate of 30°C/hr. to100°C/hr. if the annealing temperature is 650°C, but if the annealing temperature is 550°C, the annealing is not effective even with a longer holding time.
    (4) In the case of multipass welding residual stresses studied in this paper, the behaviors of high stresses during annealing are approximated by ones during anisothermal relaxation.
    Download PDF (493K)
  • Equilibrium Wetting
    Eikichi Takahashi, Hisao Nagasawa
    1978 Volume 47 Issue 8 Pages 507-513
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Important factors in testing methods of quantitatively evaluating the wettability of a soldering system are discussed. It is shown that adhesion tension obtained directly by the surface tension method is a basic important factor governing wetting phenomena, and that the wetting behaviour may be interpreted from various points of view such as spreading or penetration characteristics of the soldering system. Experimental results obtained by surface tension methods on the equilibrium wetting of copper by tin-lead solders with rosin flux are described. These give an explanation of the discrepancies between the results of area-of-spread and capillary-penetration tests and give an insight into the slight difference between the results of area-of-spread tests and the practical assessments of soldering performance. It is found that adhesion tension exerts dominant influences on practical soldering, and the surface tension method can be expected to be useful for the quantitative evaluation of actual solderability.
    Download PDF (521K)
  • The mottling and high temperature ductility
    Toichi Watanabe, Shigeru Matsuda, Akiyoshi Yamanouchi
    1978 Volume 47 Issue 8 Pages 514-518
    Published: August 05, 1978
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Effects of the mottled appearance on the high temperature ductility was investigated. Longitudinal all-weld-metal specimens of as welded and annealed conditions with different levels of contrast were prepeared. The results may be summalized as follows.
    1. Progressive increase in the contrast produced a marked decrease in high temperature ductility.
    2. The decrease in ductility was observed for both specimens of as welded and annealed conditions. The results obtained seem to suggest a ceartain relation between the mottled appearance and the less ductility.
    Download PDF (3549K)
feedback
Top