JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 37 , Issue 5
Showing 1-7 articles out of 7 articles from the selected issue
  • 1968 Volume 37 Issue 5 Pages 403-472
    Published: May 25, 1968
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    Download PDF (22851K)
  • Yoshiro Masuda
    1968 Volume 37 Issue 5 Pages 473-479
    Published: May 25, 1968
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    Download PDF (512K)
  • Kunihiro Iida
    1968 Volume 37 Issue 5 Pages 480-493
    Published: May 25, 1968
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    Download PDF (2525K)
  • Toshie Okumura, Kohsuke Horikawa
    1968 Volume 37 Issue 5 Pages 494-501
    Published: May 25, 1968
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    Download PDF (491K)
  • Kazuyuki Takeuchi, Hiroo Asada
    1968 Volume 37 Issue 5 Pages 502-508
    Published: May 25, 1968
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    Download PDF (2002K)
  • Takashi Nakamura, Hamasaki Masanobu
    1968 Volume 37 Issue 5 Pages 509-512
    Published: May 25, 1968
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    In spot welding, it has been believed that the hydraulic system for electrode force has less good performance than the pneumatic system, because the former has poor response of electrode and may cause expulsion on account of the non-compressibility or weaken the strength of spot weld through the increased electrode force because of restriction of electrode movement which results from the expansion of materials. However, it has been found that expulsion does not occur and the electrode force does not increase so much because it is absorbed by high pressure rubber hose as the result of its expansion.
    It has been also found that even in the hydraulic system the weld can be made satisfactorily without any troubles in mild steel and aluminum spot welding..
    Download PDF (247K)
  • Minoru Okada, Hiroshi Ikawa, Shigeo Shin, Yoshikuni Nakao, Hiroaki Osi ...
    1968 Volume 37 Issue 5 Pages 513-522
    Published: May 25, 1968
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    Ni-base heat resisting super alloys have been used for conponents of welded stuructures. However, most of Ni-base alloys are unweldable. And there are many reports on the weld cracking of such alloys.
    It is said that René 62 is weldable, in addition, it possesses favourable elevated temperature properties. Fundamental properties (including weldability) were investigated on Rene 62 and the following results were obtained.
    (1) Precipitating phases in René 62 are γ' phase {Ni3 (Al, Ti, Nb)} and Laves phase {(Fe, Cr)2 (Mo, Nb, Ti)}, and age hardening is caused by precipitation and growth of γ' phase.
    (2) Short time tensile strength of aged Rene 62 is approx. 100 kg/mm2 at room temperature and approx. 80 kg/mm2 at 750°C.
    (3) As the result of bead-on-plate test on solution-treated René 62, the H.A.Z., where maximum heated temperature is in the region of 850-900°C, is hardened by fine precipitation of γ' phase. However, hardening is not so large as that in high strength steels.
    (4) Welding of 7 mm thick Rene was made by Tig method. No weld cracking was observed, and the joint efficiency was very good.
    (5) In Ni-Al-Nb alloys shown in Table 2, Nb promotes the precipitation of γ' phase.
    (6) When AI content of René 62 is increased to 4.15%, weld cracking is formed in bead-on-plate test on as-cast materials. Decrease in ductility of matrix and decrease in γ' phase dissolved range at elevated temperature by increasing Al content are considered to increase the weld crack sensibility.
    (7) Therefore, in Rene 62, a low level of Al content is considered to be one of the important factors for good weldability.
    Download PDF (9459K)
feedback
Top