溶接学会誌
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
42 巻, 4 号
選択された号の論文の7件中1~7を表示しています
  • 佐藤 邦彦, 瀬尾 健二, 樋口 元一, 矢田貝 隆夫
    1973 年 42 巻 4 号 p. 302-314
    発行日: 1973/04/25
    公開日: 2011/08/05
    ジャーナル フリー
    This report deals with the strength of partial penetration groove welded joint which has become a subject of general interest in architecture but of which little information is available. In this report it is found that the theoretical evaluation of the strength based on the theory of localized necking agrees with the experimental results. In the series of experiments the results obtained are as follows.
    1) The yield strength and the maximum strength of throat area increase with an increase of the depth of penetration (p) and decrease with an increase of the leg length (f) (cf. Fig. 8, 12, 14, 20).
    2) The maximum laod of the welded joint increases with an increase of the depth of penetration (p) and the leg length (f) (cf. Fig. 9, 13, 15 21).
    3) The fracture mode is affected with a ratio of p/f. When p/f is smaller than 1.5, the fracture arises in the fillet weld metal, and when p/f is larger than 1.5, the fracture arises between the base matel and the heat affected zone. (cf. Photo. 1, 2, 3, 5).
    4) In the usual design of the joint, the theoretical equation (2) or Fig. 4 is well applicable.
  • 主として粗さと残留応力の関係について
    末沢 芳文
    1973 年 42 巻 4 号 p. 315-323
    発行日: 1973/04/25
    公開日: 2011/08/05
    ジャーナル フリー
    According to the researches already carried out, it is clear that brazed joint strength of specimen with coarse brazing surface is greater than that of ones with smooth brazing surface. It is considered that these phenomena depends on the effect of the following factors:
    1) Actual contact area of brazed joint.
    2) Residual stress of brazed joint.
    3) Hardness distribution of brazed joint.
    This paper presents some experimental evidence of residual stress measured by X-ray stress maesuring process and hardness distribution measured by micro-Vickers hardness tester. To obtain smoe experimental data, 10 × 32 × 2.6/m/m mild steel as the base metal and BAg-8 as a filler metal were prepared, and the abutting surfaces of base metals were Polished with various emery papers (No. 60, 120, 240, 400, 600mesh) to set up various roughnesses on the brazing surface. These specimens were brazed with BAg-8 filler metal in the 35 kW resistance furnace operated in hydrogen atmosphere. Residual stress measuremtnt was carried out by means of an X-ray Rstess measurement diffractometer manufactured by Tokyo Shibaura Electric Co.
    These examinations gave the results as follows:
    1) Residual stress of brazed joint with coarse surface was larger than that of ones with smooth brazing surface.
    2) Eesidual stress of y directio n (Fig. 7, 8) was larger than that of x direction; it is considered that these phenomena were caused by soliditic shrinkage of filler metal at the brazed joint.
    3) Most of these residual stresses were tension stresses, their max value being 4.5kg/mm2 and their min, value being 0.1kg/mm2.
  • 被覆アーク溶接で母材へ拡散する水素の測定
    坪井 潤一郎, 西馬 三郎
    1973 年 42 巻 4 号 p. 324-332
    発行日: 1973/04/25
    公開日: 2011/08/05
    ジャーナル フリー
    It has widely been accepted that the hydrogen which diffuses from weld metal into base metal in the arc welding plays an important role in embrittlement and formation of delayed cracks in the heat affected zone of weldment, but the direct measurement of such hydrogen has scarecely been reported. This paper describes a new device has been used to determine the volume of hydrogen diffusing from weld metal into base metal as a function of time, and the effects of moisture in the coating of electrode, strength of steel and preheating temperature on the behavior of hydrogen diffusing into the heat affected zone are investigated.
    The mian results obtained are as follows;
    1) By the use of a vacuum system, the technique can accurately estimate the hydrogen diffusing from weld metal into base metal for a comparatively simple device.
    2) When electrode containing the same humidity is used, the hydrogen content in the heat affected zone of weldment decreases with increasing strength of steel.
    3) The hydrogen content in the heat affected zone increases with the increase in preheating temperature, and the magnitude of increment decreases as steel increases its strength.
    4) It is necessary to consider the chemical composition of base metal in the hydrogen test of weld metal, because about half of the diffusible hydrogen estimated by JIS method may be the hydrogen diffusing into base metal.
    5) The behavior of hydrogen in the heat affected zone of weldment during and after the arc welding may be dealt with engineering parameter D proposed in this paper on an assumption of unidimensional diffusion of hydrogen.
  • 益本 功, 玉置 維昭, 沓名 宗春
    1973 年 42 巻 4 号 p. 333-342
    発行日: 1973/04/25
    公開日: 2011/08/05
    ジャーナル フリー
    It is well known that a low melting point filmy sulfide causes hot cracking in a steel weld metal. Especially, in the case of nickel steel weld metal containing over 2.5% of nickel, the occurrence of such hot cracking becomes more significant even in a small amount of sulphur, such as 0.01 %. In this paper, the effect of alloying elements, which can effectively change the iron sulfide film into other sulfides of higher melting point and of globular form, was studied to prevent such not cracking.
    The experimental result showed that hot cracking of 3.5% Ni steel weld metal can be prevented by addition of strong sulfide forming elements, like zirconium or titanium. These elements are much more effective to prevent such hot cracking than manganese. Sulfide inclusion of these elements seems to be globular type of MnS, TiS or ZrS, respectively.
  • 溶接金属中の拡散性水素と各種われの関係について
    坪井 潤一郎, 寺嶋 久栄
    1973 年 42 巻 4 号 p. 343-355
    発行日: 1973/04/25
    公開日: 2011/08/05
    ジャーナル フリー
    拡散性水素量の異なるフラックスを用いてHT-80鋼のサブマージアーク溶接における窓型拘束われ試験およびすみ肉拘束われ試験を行ないつぎのことを明らかにした.
    (1)多層盛り突合せ溶接金属に認められる横われは,最終層下部からその直下の層の上部附近で発生し,水素の影響を著しくうける.
    (2)すみ肉溶接における横われは,ビード縦方向の変形をフランジ材裏面のビード方向に取付けた防撓材で拘束した細長い試験板で再現でき,縦われは比較的小型の試験板でウェブ材のたおれこみを拘束すれば再現できることがわかった.
    (3)すみ肉溶接金属に発生する横われには,ルート部から発生するものと溶接金属中で発生するものとがあり,いずれも水素の寄与が著しい.
    (4)突合せ溶接金属とすみ肉溶接継手の溶接金属中で発生する横われは同種のもので,おもにオーステナイト粒界に沿って伝播する.
    (5)すみ肉溶接金属に発生する縦われは水素によるルートわれであるが,拡散性水素量を少なぐするフラックスを用いる場合には,予熱や後熱によりあるいは溶接金属の強度を下げることにより防止することができる.
  • 木原 博, 佐藤 邦彦, 豊田 政男
    1973 年 42 巻 4 号 p. 364-378
    発行日: 1973/04/25
    公開日: 2011/08/05
    ジャーナル フリー
  • 1973 年 42 巻 4 号 p. 379-382
    発行日: 1973/04/25
    公開日: 2011/08/05
    ジャーナル フリー
feedback
Top