JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 35, Issue 10
Displaying 1-8 of 8 articles from this issue
  • Shigeo Akashi
    1966 Volume 35 Issue 10 Pages 953-968
    Published: October 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Itsuhiko Sejima, Masao Ishihara
    1966 Volume 35 Issue 10 Pages 969-987
    Published: October 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Tsuneo Nakai, Toshimi Yamane, Masao Tanaka, Akiho Otsubo
    1966 Volume 35 Issue 10 Pages 988-993
    Published: October 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    A new nickel base hydrochloric acid resistsnt alloy has been developed and welding tests were performed on this alloy.
    The compositions of the new hydrochloric acid resistant alloy named HZ Alloy CL were molybdenum 25, tungusten 3, copper 1, iron 1, titanium 0.2 weight % and nickel balance.
    Coated flux compositions of low hydrogen type on the new alloy electrods were determined. Using this newly developed alloy electrods coated with the flux, Hastelloy C plates were welded by direct current. These weld joints had over 75 kg/mm2 in tensile strength, and over 25% in elongation as welded.
    The new alloy plates were welded with the new alloy filler metal by TIG arc welding. The tensile strength of the weld joints was a little higher than that by the new alloy electrodes and elongation was almost the same as that by the new alloy electrodes. These deposited metal had almost the same hydrochloric acid resistance as the new alloy plates and casting. In welded parts, there were not observed precipitated second phases which deteriorated the ductility of metals.
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  • Minoru Okada, Kazumasa Tashiro
    1966 Volume 35 Issue 10 Pages 994-999
    Published: October 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    A plasma jet of low gas flow rate can be somehow generated by the usual plasma torch, but more easily by the A-type torch having a copper anode nozzle whose inner surface is smoothly and convergently curved.
    But this torch has some shortcomings. To eliminate these shortcomings the authors have devised the B-type torch having a gas guide nozzle which is electrically insulated from the cathode and the anode, and installed between them. This gas guide nozzle can constrict the arc and direct it along the torch axis.
    Generating the plasma jet whose arc current and argon flow rate were respectively 270 Amp and 3-12 1/min, some characteristics were investigated of the two types of torches to compare them. The distance between the cathode and the nozzle exit was changed in the range of 11-20 mm.
    Results obtained of the experiments are as follows:
    (1) The arc voltage is more stable for the B-type torch than for the A-type torch.
    (2) The regulation of the arc voltage is easier for the B-type torch than for the A-type torch.
    (3) The output power of the B-type torch can be larger than that of the A-type torch at a certain constant arc current and gas flow rate.
    (4) When the plasma jet is laminar, its flame is longer with the B-type torch than with the A-type torch.
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  • Effects of Oxygen Contents in Supplied Gas on Impact Values of Weld Metals of a Rimmed Steel
    Isao Masumoto, Koreaki Tamaki, Yoshihiko Asai
    1966 Volume 35 Issue 10 Pages 1000-1006
    Published: October 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    A rimmed steel (0.20% C, 0.01% Si, 0.49% Mn) was welded using CO2-O2 arc welding process with eight electrode wires. The silicon and manganese contents in each electrode wire were varied (0.33-1.26% Si, 1.44-0.90% Mn, respectly). Effects of chemical compositions of electrode wires and oxygen contents in supplied gas on V-notch Charpy impact values of weld metals were investigated and the following results were obtained:
    (1) Impact values of weld metals are generally increased with addition of oxygen to supplied gas, if electrode wires contain sufficient amounts of silicon and manganese.
    (2) Impact values of weld metals are high when silicon and manganese of electrode wires are contained in the field in which unsaturated silicate is produced by deoxidizing reaction with silicon and manganese in molten iron. But if electrode wires contain large amounts of non-metallic inclusions, the values are not always high, though their silicon and manganese contents may be the same as the above mentioned.
    (3) Therefore it is necessary to minimize the amounts of non-metallic inclusions of electrode wires as much as possible to increase the impact values of weld metals.
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  • Tetuo Kanda, Kimio Kimura, Sadasi Nisino
    1966 Volume 35 Issue 10 Pages 1007-1014
    Published: October 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    It was previously reported that a new spot welding machine, namely "Direct Spot Welder, "had been fabricated, which could produce good welds without any surface treatment prior to spot welding of aluminum alloys. The principle of this spot welding is breaking of the oxide film on the surface of sheets, that is, an electrical bridge as effective as the surface treatment is formed on the faying of sheets. And since the thickness of sheets was below 1.6 mm, shaking the electrode by compressed air was greatly useful.
    For the sheets over 1.6 mm, however, this method was practically of no use. Then, ultrasonic vibration was applied to break the oxide film.
    This report deals with the equipment for breaking the oxide film, the influence of factors of ultrasonic vibration, such as amplitude, vibrating time or pressure, etc upon the breaking of oxide film, the process of spot welding and the quality of spot welds.
    As the result of the investigation, it is made clear that this method is applicable to Direct Spot Welder for thick sheets.
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  • Effect of Heat Treatment on the Behavior of AlN and Mechanical Properties of Aluminum Nitride Bearing Steel
    Minoru Okada, Shigeo Shin, Yoshikuni Nakao, Hiroshi Misawa
    1966 Volume 35 Issue 10 Pages 1015-1024
    Published: October 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Recently, aluminum nitride bearing steel (AIN bearing steel) is researched as a material which has good mechanical properties, in particular higher ductility at low temperature.
    In this report, to clarify the weldability of the steel, the behavior of AIN under various conditions of heat treatment and mechanical properties of the steel affected by various thermal cycles are investigated.
    The results of these investigations are summarized as follows:
    (1) AIN is almost dissolved into matrix after solution treatment at 1350°C for 30 min.
    (2) Grain growth of the AIN bearing low carbon steel is not observed up to 1100°C.
    (3) Transition temperature of AIN bearing low carbon steel is lower than that of aluminum killed low carbon steel.
    (4) AIN bearing low carbon steel has higher ductility and better impact property than aluminum killed low carbon steel after treatment with various thermal cycles (max. temp. 1150°C).
    (5) AIN bearing low carbon steel has almost the same mechanical properties as aluminum killed low carbon steel after treatment with various thermal cycles (max. temp. 1350°C).
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  • Hot craking of weld metal
    Harujiro Sekiguchi, Isao Masumoto, Kaneyuki Imai
    1966 Volume 35 Issue 10 Pages 1025-1032
    Published: October 25, 1966
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    The present investigation was undertaken to find out the effect of nickel, manganese, sulphur and phosphor contents of weld metals of low nickel alloyed steels for low temperature service on their susceptibility to hot cracking, when welding was performed with various electrodes by CO2-O2 arc process.
    The following results were obtained:
    (1) Nickel and sulphur contents of weld metals have a very noticeable effect on their hot cracking. Particularly, even with the same sulphur content, hot cracking tendency of weld metals containing more than 2.50% nickel is much higher than that of those containing below 2.50% nickel.
    (2) It is necessary to keep the combined sulphur-phosphor content below 0.020% in order to prevent the hot cracking of weld metal containing 2.50 to 3.50% nickel.
    (3) Judging from distribution of concentration by X-ray microanalyzer, it is deduced that nickel concentration reduces in the grain boundary near hot cracks, but inversely sulphur concentration remarkably increases. Manganese concentration shows the same tendency as sulphur concentration, but phosphor concentration does not especially show any renharkable changes of concentration in the grain boundary near hot cracks.
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