JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 30, Issue 8
Displaying 1-6 of 6 articles from this issue
  • The Welding of JRR-3 Heavy-Water Cooler
    Tsuneo Kurokawa, Masato Ueda
    1961 Volume 30 Issue 8 Pages 524-533
    Published: August 25, 1961
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Download PDF (11716K)
  • Aluminium Killed Steel and Low Nickel Steel
    Toshikage Ikkai
    1961 Volume 30 Issue 8 Pages 534-540
    Published: August 25, 1961
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    This paper reports on the automatic welding of aluminium killed steel and nickel steel, since properties of those steels, those heat-treatments and manual welded electrodes have been already reported in many other papers. This paper describes the relation among chemical components, gas analysis values and inclusions in connection with impact values. The author examined to determine suitable component ranges of wires and welding conditions for the purpose of obtaining those results which give ones more than standard impact value.
    Download PDF (455K)
  • Kazuo Kato
    1961 Volume 30 Issue 8 Pages 541-550
    Published: August 25, 1961
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    In the previous reports, the author separated the oxide inclusions using alcoholic iodine method and observed, analysed or determined these crystal forms. In this report, sulphide inclusions in mild steel weld metals are separated and determined these crystal forms using x-ray diffractometer. This method of separation is alcoholic iodine method but is different from the previous one in a few point. A piece of 10-15g of specimen is rotated slowly dipping in alcoholic iodine solution under pure H2 atmosphere, stop the rotation when the half of specimen is desolved, filter the solution and wash the residue. It is proved analytically that about 80% of sulphides are separated as residue after these process, but all of sulphides are desolved and oxides are only remained as residue if the method in the previous report is used.
    From the results of diffraction, three forms of sulphides are detected; FeS, MnS and FeS-MnS solid solution. FeS-MnS solid solution has the same crystal system (Cubic) with pure MnS but slightly smaller lattice parameters. Ionic radius of Fe is smaller than Mn and FeS-MnS solid solution can be exist according to the phase diagram, so the crystal form of this solid solution seemed to be same as of FeS-MnS.
    The specimens used in this experiments have several contents of Mn and S. Only MnS can be detected in the weld metals containing more than 1% Mn, only FeS in the ones containing fewer than 0.1% of Mn and MnS, FeS-MnS or FeS-MnS and FeS can be detected in the ones containing 0.3-0.9% Mn. After these experiments the relation between the crystal forms of sulphide inclusions and ratio [Mn]/[S] in weld metals is examined. If [Mn]/[S]>5, the sulphides are only MnS, 5>[Mn]/[S]>4 FeS-MnS, 4>[Mn]/[S]>1 FeS-MnS and FeS, 1>[Mn]/[S] only FeS.
    Download PDF (11492K)
  • Haruysohi Suzuki, Tatsuya Hashimoto, Hukuhisa Matsuda
    1961 Volume 30 Issue 8 Pages 551-570
    Published: August 25, 1961
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    Mechanical and corrosion resistance properties were investigated of welded joints of Zircaloy-2 sheets, 1 and 2 mm thick, which were welded in a controlled atmosphere welding chamber filled with either pure argon or impure argon mixed with an impurity gas of air, nitrogen, oxygen or hydrogen.
    Characteristics of welded joints which welded in pure and impure argon atmospheres, namely, hardness, microstructure, tensile and bending properties and corrosion resistance against high temperature high pressure water were studied and the following conclusions were obtained ;
    (1) Weld metal was the most hardened zone in welded joint because its microstructure consisted of α'+α structure. The heat-affected zone was more hardened than base metal.
    (2) Tensile strength of weld metal was stronger than that of base metal at each temperature in the range of room temperature up to 500°C. Thus tensile fracture of welded joint occured in base metal.
    (3) Rupture strengths at 1000 hr. of weld metal and base metal at 316°C were about 19 kg/mm2 and 16.5 kg/mm2, respectively.
    (4) Corrosion resistance of welded joint against high temperature high pressure water was better than that of base metal when was pickled after welding.
    (5) It is recommended for zircaloy-2 to pickle (HF 5%+HNO345%+H2O 50%, at room temperature for 30 sec) after welding for high temprature high pressure corrosion test.
    (6) The effects of impurity gases in argon atmosphere on mechanical and corrosive properties of weld metal are as follows (shown in Table 2) :
    (a) More than 5×102-103 ppm (vol.) of air, N2 gas and 103-5×103 ppm of O2 gas embrittled the mechanical properties, and hardness of the weld metal.
    However, H2 did not change the hardness and tensile strength although more than 102-5×103 ppm it enbrittled the weld metal.
    (b) More than 7 × 102 ppm of air and 102 ppm of N2, O2 and H2 gas if specimens would not be pickled after welding decreased greatly the corrosion resistance against high temperature high pressure water. On the contrary, if specimens would be pickled after welding, up to 104 ppm of air, 5 × 103 ppm of N2, 104-105 ppm of O2 and H2 gas did not decrease corrosion resistance.
    (7) As far as the controlled atmosphere welding is concerned, it seems to be necessary for reactor purposes to use on initial vacuum less than 10-1 mmHg and filling with high pure grade (99.99% up) argon to one atmosphere and to pickle (HF 5%+HNO3 45%+H2O 50%) the specimens after welding.
    Download PDF (20791K)
  • On the Weldability and the Selection of the Suitable Welding Conditions for Titanium
    Minoru Okada, Shigeo Shin
    1961 Volume 30 Issue 8 Pages 571-579
    Published: August 25, 1961
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    In the inert-gas arc welding of titanium, we must most pay attention to shielding the weld metal and its neighbourhood (heat affected zone) from atmosphere. For this purpose, it is desirable to weld titanium in the chamber which inert-gas is filled up, or with proper jigs.
    And to examine how the welding conditions affect the weld properties of materials, it is very important for the determination of the proper welding conditions and the study of the weldability for titanium.
    In this investigation, the following terms which were seemed to be most important for the welding of titanium, were studied the effect on the weld properties of titanium, and the suitable welding conditions were obtained.
    1) Surface preparation for titanium
    2) Joint design
    3) Number of welding pass for thick plates
    4) Sielding method
    5) Design of fixture and backing plate
    6) Purity and flow of Ar gas
    7) Diameter of electrode
    8) Welding current
    9) Welding speed, etc.
    Titanium welds obtained with the suitable welding conditions have almost as good mechanical properties as the base metal, Therefore, titanium can be said to have good weldability.
    Download PDF (13924K)
  • On the Structural Change of the Heat Affected Zone in Titanium Welds
    Minoru Okada, Shigeo Shin
    1961 Volume 30 Issue 8 Pages 580-582
    Published: August 25, 1961
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    In this investigation, were studied about the structural change of the heat affected zone in titanium welds.
    The structures in titanium welds were, in order from the base metal to the weld metal, α, grown α, α'+α and α' (all of these are H.C.P. structure).
    The zone which were thought to have been heated about 900°C or so, was softest and the structure was grown α.
    In the tensile test of titanium butt joints, the specimens were failued in this part, however the destruction had plenty of ductility.
    Download PDF (3332K)
feedback
Top