JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
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Volume 42, Issue 11
Displaying 1-7 of 7 articles from this issue
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  • Studies on Flux Action of Soldering
    Amine Hydrochloride
    Hiroshi Kihara, Ikuo Okamoto, Akira Omori
    1973 Volume 42 Issue 11 Pages 1065-1072
    Published: November 25, 1973
    Released on J-STAGE: August 05, 2011
    DOIhttps://doi.org/10.2207/qjjws1943.42.1065
    JOURNAL FREE ACCESS
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    In this report, various amine hydrochloride flux action of soldering was studied on the relation between the reaction of flux with base metal or with Sn-Pb alloy solder and spreading phenomenon.
    he experimental results obtained are as follows;
    1) Aniline hydrochlord idie reacted with Sn-Pb alloy solder at 250°C to give SnCl2, PbCl2 and aniline.
    The corrosion rate increased on going to Sn-36%Pb, to Sn-10%Pb and to Sn.
    2) The addition of SnCl2 to C6H5NH2HCI had little effect on improement of spreading of Sn-Pb eutectic alloy solder, because SnCl2 reacted with Pb in the solder to give PbCl2 and the property of the solder changed greatly.
    3) The increase in the corrosion rate of various fluxes with Cu plate caused the increase in spread of Sn solder with these fluxes.
    4) Aniline hydrochloride reacted with Cu plate to give aniline and CuCl2i which reacted with molten Sn to give SnCl4 and Cu. And the Cu produced dissolved into Sn solder.
    5) The addition of CuCl2 to C6H5NH2HCl had a great effect on improvement of spreading of all the solders, Sn, Sn-5%Pb and Sn-10%Pb. When CuCl2 added to C2H5NH2HCl, the effect was more great.
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  • Sulphide and Its Effect on Slidification Cracking in Weld Metal of Steel (Report 3)
    Fundamental Investigation of Oxysulphides in Fe-S-O Ternary Alloys
    Tomio Senda, Fukuhisa Matsuda, Hiroji Nakagawa, Tadahiro Iwasaki, Kiyo ...
    1973 Volume 42 Issue 11 Pages 1073-1084
    Published: November 25, 1973
    Released on J-STAGE: August 05, 2011
    DOIhttps://doi.org/10.2207/qjjws1943.42.1073
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    Shape and structure of oxysulphides formed in TIG-arc weld metals of Fe-S-O ternary alloys and their effects on solidification crack susceptibility have been investigated. At the same time the applicability of the law of coincidence for change in liquid compositions during non-equilibrium solidification has been examined. Main conclusions obtained are as follows:
    1) The shape and structure of oxysulphides and the crack susceptibility of weld metal can be classified by O/S ratio which was expected by the law of coincidence.
    2) Filmlike oxysulphide formed at columnar grain boundary in weld metal with low O/S ratio changes into globular shape with increase in O/S ratio.
    3) The shape of oxysulphide formed at cell or cellular dendrite boundary is always globular independent of O/S ratio.
    4) Solidification crack always occurs along the filmlike oxysulphide formed in weld metal with low O/S ratio. No crack is observed along the globular oxysulphide formed in weld metal with high O/S ratio.
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  • Studies on the Hot Dip Coating of Pb (Report 2)
    Effect of Chemical Displacement Reaction between Cu Chloride and Solder on Spreadability of Sn-Pb Solder
    Isamu Ueda, Masaaki Kawamura
    1973 Volume 42 Issue 11 Pages 1085-1092
    Published: November 25, 1973
    Released on J-STAGE: August 05, 2011
    DOIhttps://doi.org/10.2207/qjjws1943.42.1085
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    As reported in previous paper, the chemical displacement reaction between flux and solder or base metal can be determined by free energy of formation of metal chloride. In this report, authors describe to-behavious of CuCI, CuCl2 or CuO in ZnCl2 flux.
    CuCl or CuCl2 existing in molten ZnCl2 react with Sn-Pb solder to displace Cu. The spread area of Sn-Pb solder on Cu plate is increaded due to Cu produced by this displacement reaction between flux and solder.
    The spread area of solder is governed by test temp., composition of Sn-Pb solder and added quantity of CuCl or CuC12 to ZnCl2. In this case, the spreading characteristics may be classified into three different categories. Namely
    (1) The marked secondary spreading causes in definite range of test temperature.
    (2) The marked secondary spreading causes at all range of test temperature.
    (3) The slight secondary spreading causes at all range of test temperature.
    When flux added CuO to ZnCl2 aqu. solution is used, the spreading characteristic of Sn-Pb solder with this flux on Cu plate is similar to ZnCl2-CUCl or ZnCl2-CuCl2 fluxes. Namely, when ZnCl2 aq. solution is concentrated on heating, HCl is produced. This HCl reacts with CuO to produce CuCl or CuCl2
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  • Improvement of the Fatigue Strength of Welded Steel Joints by Metal Bath Dipping and Rapid Cooling (Report 5)
    Improvement of the Fatigue Strength of Welded Steel Beams by Rapid Cooling after Hot Galvanizing
    Isao Masumoto, Mitsumasa Iwata, Tadashi Watanabe
    1973 Volume 42 Issue 11 Pages 1093-1099
    Published: November 25, 1973
    Released on J-STAGE: August 05, 2011
    DOIhttps://doi.org/10.2207/qjjws1943.42.1093
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    A method is proposed for improving the fatigue strength of welded steel joints, which consists of rapid cooling in water after hot galvanizing. The effect of this method has been confirmed experimentally by tests on two kinds of welded I-beams. Fatigue test results for these beams show the considerable improvement of fatigue life which can be obtained by the above-mentioned treatment. The reasons for the improvement are also explained experimentally by age hardening and compressive residual stress on the joint surface.
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  • Study on Initiation of Brittle Fracture transit from Delayed crack in thicker Weldments
    Yasuhiro Nishio, Katsuya Kajimoto, Tsuneto Hirozane, Yasuyuki Yoshida
    1973 Volume 42 Issue 11 Pages 1100-1107
    Published: November 25, 1973
    Released on J-STAGE: August 05, 2011
    DOIhttps://doi.org/10.2207/qjjws1943.42.1100
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    It is reported that brittle fracture have occured in no defected pressure vessels under water pressure testing. In this paper, the cause of such phenomnon occurance was investigated by reappearing above mentioned brittle fracture in test piece.
    The result of tests are summarized as follows:
    (1) Thicker weldment contains diffusible hydrogen for a long period, which cause and prolong delayed cracks under the loading of water pressure testing.
    (2) Prolonged delayed cracks transit to brittle fracture when the stress intensity factor Ki becomes larger than Kc which is material constant for the brittle fracture initiaiton.
    (3) Above phenomenon are illustrated in Fig. 11.
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  • Examination for Establishment of Method of Taper Hardness Test
    Michio Inagaki, Yoshiki Muramatsu
    1973 Volume 42 Issue 11 Pages 1108-1115
    Published: November 25, 1973
    Released on J-STAGE: August 05, 2011
    DOIhttps://doi.org/10.2207/qjjws1943.42.1108
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    To examine the relation between the maximum hardness of weld heat-affected zone and the cooling time from 800 to 500°C the method of taper hardness test has been used. At the standardization of this method for JIS, the authors corrected the defects of the old specification of the Japan Welding Engineering Society (WES) and carried out the measurement for studying the effects of bead length and heat reflection by the back and thinner edge of the specimen on the cooling time from 800 to 500°C, and for examination the difference of cooling time between the taper and flat specimen, and some calculations were carried out, too.
    At the thinner part oflocal thickness, the cooling time from 800 to 500°C is controlled mainly by the bead length laid before and after passing of arc over the measured or calculated point and secondly by the effect of the thinner edge of the specimen. Measured value and calculated value were nearly equal and similar tendencies were obtained between them.
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  • High Productive Technique on Welding
    Tomomichi Hotta
    1973 Volume 42 Issue 11 Pages 1116-1157
    Published: November 25, 1973
    Released on J-STAGE: August 05, 2011
    DOIhttps://doi.org/10.2207/qjjws1943.42.1116
    JOURNAL FREE ACCESS
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