巻号一覧
41 巻, 4 号
選択された号の論文の10件中1～10を表示しています
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益本 功, 篠田 剛1972 年 41 巻 4 号 p. 354-367
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (4108K) -
石井 勇五郎1972 年 41 巻 4 号 p. 368-378
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (8183K) -
益本 功, 江原 隆一郎1972 年 41 巻 4 号 p. 379-384
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーAl-4.5%Mg合金の疲れ強さにおよぼす雰囲気の影響および被膜効果について,雰囲気調整タンク内での平板曲げ疲れ試験および小野式回転曲げ疲れ試験による実験結果から次のことが明らかになった.
1)Al-4.5%Mg合金の疲れ強さには,大気中の酸素および湿度の影響が同程度に顕著である.
2)Al-4.5%Mg合金の疲れ強さは,エポキシ樹脂の被膜によって改善でき,この改善効果は試験片の形状係数が大なる程,また被膜厚さが厚い程大である.
最後に,本研究を行なうにあたり,材料を提供していただいた住友軽金属株式会社,試験片の加工に御協力いただいた興和工業株式会社および走査型電子顕微鏡の使用を許可された日本電装株式会社に深甚の謝意を表したい.また,学部学生伊藤和俊君の熱心な協力にも感謝の意を表したい.抄録全体を表示PDF形式でダウンロード (1766K) -
脚長およびとけこみ量の影響佐藤 邦彦, 瀬尾 健二1972 年 41 巻 4 号 p. 385-393
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーIn the previous report, the effect of contour of fillet weld on the mechanical behaviour and strength of fillet welded joint was explained. The present report explains the effect of fillet size and depth of penetration on them. A model specimen, having a profile of cruciform fillet welded joint, is used for the experiments. Strain distributions in fillet weld are measured by using the Moire method. Experiments are performed in the range from 5 mm to 30 mm leg length and from -2 mm to 20 mm depth of penetration. The results obtained are as follows;
1) The yield strength of fillet welded joint is not affected by fillet size but the maximum strength decreases with incresae of fillet sixze.
2) The yield strength and the maximum sterngth of fillet welded joint are represented as a function of the penertation angle θp, and they increase with increase of the penetration angle θp.抄録全体を表示PDF形式でダウンロード (3404K) -
井川 博, 新 成夫, 森川 正樹1972 年 41 巻 4 号 p. 394-402
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリー2元系α+βTi合金と準安定βTi合金の冷却過程におけるΩ相の析出領域を検討するためにTi-Cr,Ti-Mn,Ti-V,Ti-Mo系合金の連続冷却変態図を作製し,つぎのことを明らかにした.β相温度域からの冷却過程においては,合金濃度と冷却速度の変化によりβ0→βI+α'+Ω(Ω'),β0→βi+Ω(Ω'),β0→βi+αの変態過程が存在する.Ω'は熱分析では確認できなかった.
Ω相に注目すれば冷却速度の増加にしたがいその析出度は漸次低下する傾向にある.冷却速度が遅い場合にはΩ相の析出はみとめられず,β相から直接α相が析出する.
Ti-Cr,Ti-Mn,Ti-V,Ti-Mo系合金の冷却過程におけるΩ相の析出領域は冷却速度と電子濃度によって整理すれば一つの領域に簡潔に図示できる.それゆえ2元系α+βTi合金と準安定βTi合金の溶接においては,この領域以外の条件ならば溶接部におけるΩ相の析出を防止することは可能である.抄録全体を表示PDF形式でダウンロード (8983K) -
佐藤 邦彦, 瀬尾 健二1972 年 41 巻 4 号 p. 403-414
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーThe present paper deals with the strength of fillet welded joint. Theoretical evaluation of the strength based on the theory of localized necking is presented and compared with the experimental results. In the theoretical analysis, Mises plastic potential and Henckys stress-strain relation are adopted. The theoretical results agree well with the test results.
The results obtained are as follows.
1) The yield strength of fillet welded joint can be evaluated with no regard for workhardcning of materials, but the maximum strength is affected by the rate of workhardening.
2) The yield strength is not affected by the size of the fillet weld, but the maximum strength decreases with an incresae of fillet size.
3) The yield strength and the maximum strength incresae with an increase of the fillet angle θf
4) The yield strength and the maximum strength are represented as a function of the penetration angle θp, and they increase with an increase of the penetration anlge θp.抄録全体を表示PDF形式でダウンロード (763K) -
空気雰囲気の場合小林 卓郎, 桑名 武, 木口 立而1972 年 41 巻 4 号 p. 415-424
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーUsing ten series of alloy steel electrode wires, mild steel was welded in an air atmosphere.
The individual influence of the alloying elements, C, Si, Mn, Nb, Mo, V, Co, Ta, W and Cu in the electrode wires on the nitrogen content of weld metals deposited at three current levels was systematically studied.
The results are summarized as follows;
1) The alloying elements in steel electrodes can be divided into the following three groups by the type of their influences on the nitrogen content of weld metals obtained in an air atmosphere;
(I) Nb, V, Ta, Mn, Al, Ti, Zr
(II) C, Si,
(III) Cu, Co, Mo, W
2) The elements in group (I) alloyed up to a certain amount reduce the nitrogen content of weld metals and an excess amount of them again increases the nitrogen content, at low welding currents. At high currents, the elements in group (I) generally increase the nitrogen content of weld metals.
3) The elements in group (II) reduce the nitrogen content of weld metals both at low and high currents.
4) The elements in group (III) have no important influence upon the nitrogen content.
5) The individual influence of the element can be explained satisfactorily with its affinity to oxygen and its influence on the solubility of nitrogen in molten iron.抄録全体を表示PDF形式でダウンロード (657K) -
炭酸ガスレーザによる熱加工荒田 吉明, 宮本 勇1972 年 41 巻 4 号 p. 425-435
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーThe CO2 laser was applied to a heat source for processing various materials such as welding, cutting and chilling.
Conclusions obtained are summarized as follows;
(1) Excellent fusion welding with narrow bead width and sufficient mechanical strength was performed by the CO2 laser in case of a thin metal. The surface treatment, which enhanced the CO2 laser beam absorptance of the metal, had no bad effect on the weld.
(2) New cutting technique, "laser gas cutting", of which the cutting energy consisted of laser beam energy, chemical reaction energy such as an oxidation energy and dynamic energy of gas jet, was developed, and fine cutting with narrow kerf width and heat affected thin layer was accomplished.
(3) Non-metallic material was easily heated by CO2 laser beam because of its high beam absorptance and poor thermal conductivity. In case of an easily evaporizing material such as acryl, a deep hole with a small diameter could be obtained by using the self-focusing effect of the beam. In case of a brittle material such as glass, a fine crack formed ahead of the beam spot facillitated the cutting.抄録全体を表示PDF形式でダウンロード (10426K) -
高周波アークにおけるアーク柱の特性について西口 公之, 黄地 尚義1972 年 41 巻 4 号 p. 436-445
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーThe high frequency (3kHz) arc characteristics using W-W electrodes were studied experimentally and theoretically comparing with those of 60Hz and D.C. arcs.
As the result of experimental research, it is recognized that the polarity exchange which is an undesirable property of A.C. welding arc is very easy, i.e. restriking voltage seems not to be necessary for high frequency arc in W-W electrodes and electrical dynamic characteristics of high frequency arc is resistive over all the current range of this experiment. (Fig. 5, 6 & 7)
The resistive characteristics of 3kHz arc suggests that the temperature of arc column is held constant, since the resistance of arc column directly depends on the instantaneous temperature distribution in it.
The radiation from 3Hz arc column is intensive even in the period of current zero and the phase of the small perturbation of radiation lags by about 1/4 cycle from that of the electric power input, while at 60Hz it is in the same phase as that of the instantaneous input. (Fig. 8, 9 & 10)
Such optical data mean that dynamic A.C. arc characteristics is affected remarkably by the thermal inertia of arc column.
In the second part of this paper, the thermal energy balance at A.C. arc column is discussed.
The experimental data are found quantitatively close to the results of theoretical analysis at 3kHz, qualitatively even at 60Hz.
From such a theoretical treatment, it is concluded that temperature change of A.C. arc column depends on current frequency ω, effective electric power and mean thermal energy of arc column as follows:
If ω»ω0(ω0=3e0i0/8M0Cp0T0), the dynamic characteristics of A.C. arc column becomes resistive, i.e. at a high frequency arc, the arc column can not respond to the instantaneous current, but is sustained nearly constant.
Accordingly, in arc with W-W electrodes, the polarity exchange becomes very easy at high frequency arc due to the residual plasma at current zero.
Thus, a high frequency arc has excellent characteristics for arc stability.抄録全体を表示PDF形式でダウンロード (5872K) -
恩沢 忠男, 石井 勇五郎1972 年 41 巻 4 号 p. 446-455
発行日: 1972年
公開日: 2011/08/05
ジャーナル フリーThe interface between explosively bonded metals exhibits a wave-like form, but the theory of formation of wave has not been fully studied. In this paper the relation between wavelength and collision angle was investigated by using the semi-cylinder method and angular method, and an attempt to explain the mechanism of wave formation was made. The results obtained are as follows.
1. The wavelength increased continuously with the collision angle until a critical angle, beyond which the wave-like profile vanished and a linear interface was observed. For a given value of collision angle, the wavelength increased with the plate thickness. However the collision velocity at the critical angle was constant independently of plate thickness.
In angular method, the wave tended to grow in the direction of bonding and none was observed for the distance of 20-30 mm from starting to bond.
2. The wave amplitude increased with the collision angle but the ratio of amplitude to wavelength was constant.
3. The material near the interface suffered extreme plastic deformation and the folw configuration, in particular wave-like profile, resembled the stream pattern in a fluid having a Karman vortex street, so the authors considered that a wavy interface resulting from Kármán vortex street occurred in the vicinity of collision point and they tried to calculate the wavelength λ. The following equation was used.
For a symmetric collision shown in Fig. 12 (a) : collision angle 2γ, λ=20h (1-cosγ)
For an asymmetric collision shown in Fig. 12 (b) : collision angle γ, λ=10h (1-cosγ) where h: the thickness of flyer plate.
The values calculated by using these equations agreed generally with measured values.
4. An increase in hardness at interface, when the collision velocity exceeded 1800 m/sec, was observed in bonding an iron flyer plate to a mild steel semi-cylinder. This fact might be attributed to martensite marking of the pressure-induced tranformation that appeared at a pressure more than 130 Kbar in iron.抄録全体を表示PDF形式でダウンロード (7717K)
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