巻号一覧
45 巻, 3 号
選択された号の論文の9件中1～9を表示しています
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益本 功, 篠田 剛1976 年 45 巻 3 号 p. 180-185
発行日: 1976/03/05
公開日: 2011/08/05
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渡辺 竹春, 斎田 保, 菅原 健, 井上 章吾, 川内 守夫1976 年 45 巻 3 号 p. 186-195
発行日: 1976/03/05
公開日: 2011/08/05
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P.C. Gupta, D. Rehfeldt, F. Erdmann-Jesnitzer1976 年 45 巻 3 号 p. 196-202
発行日: 1976/03/05
公開日: 2011/08/05
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溶接結果におよぼす水圧の影響村尾 安一, 住友 敬, 浜崎 正信1976 年 45 巻 3 号 p. 203-207
発行日: 1976/03/05
公開日: 2011/08/05
ジャーナル フリーAuthors have been studied the underwater fire cracker welding and already papered that good results were obtained about not only the butt joint, but also the vertical fillet joint. But these experiments were carried out at water depth of 0.3 m. This time, therefore, as the result of welding in greater water depth by use of high pressure chamber, the following conclusions were obtained.
(1) Excellent result was secured at depth of 120 m, not to speak of welding at shallow depth, on the bead-on-plate welding.
(2) Blowholes were a little recognized with increasing water pressure on the vertical fillet welding, because water comes to welded joint from gap. But the satisfactory welds were given at depth of 50 m.
(3) No noticeable reduction of composition of weld metal occured at progressively greater depth.
(4) Good results of bending test and tensile test were obtained on the butt welding at depth of 70 m.抄録全体を表示PDF形式でダウンロード (6888K) -
水素気中アークにおける黒鉛陽極消耗と陽極形態西口 公之, 松縄 朗1976 年 45 巻 3 号 p. 208-214
発行日: 1976/03/05
公開日: 2011/08/05
ジャーナル フリーIn this paper are described the anode consumption phenomena of a graphite electrode in which chemical reaction takes place between the evaporated carbon vapor and ambient hydrogen gas. Main reacted substance in a low pressure hydrogen arc is highly concentrated acetylene and the carbon origin is the vapor from the anode spot of the graphite anode. The chemical reaction in an arc gives great effect on the anode mode as well as the anode consumption characteristics. When reaction between carbon and hydrogen in and around the arc column becomes eminent, the evaporation rate of graphite anode is accelerated to increase due to the reduction of carbon species in front of the electrode, which results in significant heat loss by the evaporation. Thus, the anode drop increases and a new anode mode appears in carbon arc in active ambient gases.抄録全体を表示PDF形式でダウンロード (600K) -
井町 正樹1976 年 45 巻 3 号 p. 215-221
発行日: 1976/03/05
公開日: 2011/08/05
ジャーナル フリーThe kinetics of wetting and adhesion of adherends (base materials) by molten polyethylene in argon gas were investigated. The former were followed by the rate of change of cosin of contact angle and the latter by the increase in peel strength according to heating time.
A summary on the results is shown below:
(1) It is confirmed that the dependence of wetting of glass, copper and teflon on time and temperature follows a law of time-temperature reduction and the master curves obtained on these adherends almost coincide with eachother.
(2) Wettability is closely related to adhesiveness but the rate of adhesion is considerably greater than the rate of wetting.
(3) The wettability and adhesiveness of copper adherend are respectably inferior to those of glass adherend, in consideration of the wettability by molten polyethylene and surface energy of both adherends. This is explained by the assumption that the numbers of bonds between polyethylene and adherend on unit interface are smaller in the case of copper than glass.抄録全体を表示PDF形式でダウンロード (2253K) -
切欠角変形付広幅引張試験による検討正岡 功, 谷田 正三, 佐々木 良一, 喜多 久直1976 年 45 巻 3 号 p. 222-229
発行日: 1976/03/05
公開日: 2011/08/05
ジャーナル フリーBrittle fracture initiation characteristics of manual arc and submerged arc welded joints of 60 kg/mm2 high strength thick steel plates were investigated by testing wide plate tension specimen with angular distortion and with a surface notch. The test results were analized by fracture mechanics. The results are summarized as follows.:
(1) The lowest V-charpy impact toughness in the weld zone was obtained at the weld fusion line.
(2) At temperatures above 0°C, the fracture initiation stress obtained from the wide plate specimens was not so lower than the yield strength of the steel.
At lower temperatures, however, the fracture initiation stress was greatly lowered. The decrease was particularly remarkable below -10°C in transversely welded W(1) joints and below -5°C in T-type welded W(1)+W(2) joints and also repair welded joints with some residual stress.
(3) The fracture toughness was calculated quantitatively from the fracture initiation stress. The values calculated in the transversely welded W(1) joints, the T-type welded joints and the repair welded joints decrease in a single band as a function of temperature.
(4) The fracture toughness in the weld fusion line of the welded joints for 60 kg/mm2 high strength thick steel is high value above 0°C, but it is remakably lowered in the temperature range of -5-20°C and shows larger dependency on temperature than that for, 80 kg/mm2 high strength thick steel. And this steel does not show the embrittlement by stress relief annealing. Therefore, there is little difference in frecture toughness between as-welded spcimen, stress relieved specimen and repair welded specimen.
(5) The fracture toughness values of the manual arc welded metal and of the submerged arc weld fusion line are almost equal to that of the manual arc weld fusion line.抄録全体を表示PDF形式でダウンロード (3120K) -
渡辺 健彦, 岡根 功1976 年 45 巻 3 号 p. 230-237
発行日: 1976/03/05
公開日: 2011/08/05
ジャーナル フリーIn this study, the effect of isothermally holding nearly just below a melting temperature of high strength steel on the notch toughness of the heat-affected zone adjacent to a weld bond was investigated.
The result of this work has shown that an isothermally holding at high temperature in a large heat input welding process has a deleterious effect on the impact toughness of the weld heat-affected zones, and that it is caused by a overheating associated with a resolution of sulfide inclusions during heating and their subsequent reprecipitation as very fine arrays of inclusions on a high temperature austenite grain boundaries.
And so, it was indicated that the resolution of sulfide inclusions and their subsequent reprecipitation on grain boundaries as well as prior austenite-grain coarsening and a formation of upper bainite structure, so far shown, were unnegligible factors causing a reduction in notch impact toughness of a weld heataffected zones.抄録全体を表示PDF形式でダウンロード (10088K) -
ラメラテアの研究(2)金沢 正午, 山戸 一成, 井上 尚志1976 年 45 巻 3 号 p. 238-244
発行日: 1976/03/05
公開日: 2011/08/05
ジャーナル フリーThe present paper discusses possible means of assessing lamellar tearing susceptibility of steel plate, taking into consideration factors for initiating lamellar tearing, referred to the preceding paper. Also discussed is the standard for steel graduation with respect to lamellar tearing tendency, giving a typical example of it.
Various testing means for assessing the lamellar tearing, tendency have been suggested up to now. The present authors, however, are of opinion that a synthetic consideration will be required from a viewpoint of their correspondence to the performance in real structures, reproducibility, easiness in testing procedures and so forth, before some of these are qualified to be the appropriate assessing means.
The present work points out the ploblems involved in the above-mentioned testing means, presents tentative standard testing procedures, and studys the correlation between these and the Z-type window test (the window test in which restraint stresses act in thickness direction).
Its outline is as follows:
(1) It is shown that both the reduction of area, in tensile test in the through-thickness direction, and the content of sulphur are the best engineering measures of lamellar tearing tendency. The specific characteristics of each testing means are also discribed.
(2) An example is given of steel graduation according to the above-mentioned engineering measures.抄録全体を表示PDF形式でダウンロード (2189K)
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