巻号一覧
33 巻, 2 号
選択された号の論文の8件中1～8を表示しています
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増渕 興一1964 年 33 巻 2 号 p. 80-85
発行日: 1964/02/25
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (469K) -
中根 守久1964 年 33 巻 2 号 p. 86-92
発行日: 1964/02/25
公開日: 2011/08/05
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上山 文男1964 年 33 巻 2 号 p. 93-100
発行日: 1964/02/25
公開日: 2011/08/05
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再現溶接金属の連続冷却変態図の作成方法と二,三の溶接金属の連続冷却変態図木原 博, 鈴木 春義, 稲垣 道夫, 高木 乙麿, 西 茂, 鈴木 和久, 下山 仁一1964 年 33 巻 2 号 p. 101-110
発行日: 1964/02/25
公開日: 2011/08/05
ジャーナル フリーThis report describes the method of plotting the continuous cooling transformation (CCT) diagram of weld metal, of which columnar structure and transformation on cooling are reproduced, and also describes the CCT diagrams of synthetic weld metals which contain Si and Mn ; Si, Mn and Ni ; and Ni, Cr and Mo. The results are follows.
1) The microstructure of actual weld metal can be reproduced by melting the center of the specimen (4.5 mmφ×70 mml) with induction heating. and CCT diagrams of synthetic weld metals can be plotted by this method.
2) The microstracture and hardness of synthetic weld metal are coincide with them of actual weld metal.
Der UmriB : Der Bericht beschreibt die Methoden des Zeichens des ZTU-Schaubildes fur kontinuierliche Abkühlung des kunstlichen wiederproduzieren Schwissmetalls, dessen Mikrostruktur and Umwandlung auf der Abkühlungen wewieder-produziert wird, and ouch beschreibt die ZTU-Schauild für kontinuierliche Abkühlung desküstlichen wieder produzieren Schwissmetalls, die enthalten Si and Mn ; Si Mn and Ni ; und auch Ni, Cr and Mo. Die Resultäter der Experimentes sind folgend.
(1) Die Mikrostruktur des tatsächlichen Schwissmetalls kan mit der Mitten der Prüflings (4.5mmφ ×70mml) zu shmelzen durch die Hochfrequenzinduktionhitzen wiederproduziert werden, and die Umwandlung auf der Ackühlungen kan mit der Hitzanalysen gemessen werden. Das ZTU-Schaubild für kontinuierliche Abkühlung des künstlichen wiederproduzieren Schweissmetalls kan mit der Methoden gezeicht werden.
(2) Und wir konnte tatsächlich gebeweiren, daß die Mikrostruktur and Härte des künstlichen wiederproduzieren Schweissmetalls haben die des tatsächlichen Schweissmetalls übereinstimmen.抄録全体を表示PDF形式でダウンロード (8126K) -
前田 豊生, 内木 虎蔵, 小杉 貞夫1964 年 33 巻 2 号 p. 111-119
発行日: 1964/02/25
公開日: 2011/08/05
ジャーナル フリーIn the welding of copper and its alloys we encounter several difficulties of somewhat different nature from those of ferritic steels. Weld metal cracking is one of these, which generally is hot cracking. This is largely due to the grain growth of crystals during welding. Refinement of them by heat treatment can not be expected, because most of the copper alloys undergo no trasformation of crystal structures. The cracking was found to be largely affected by alloy content. It was also shown that in TIG-welding, the controllable range of heat input was very narrow. Considering these, we may say that the measures to be taken for the prevention of cracking are (1) employment of filler material of dissimilar composition ; (2) lowering the amount of impurity in the base metal and the filler ; and (3) employment of other welding process. (1) is most effective and widely adopted in practice. In the case where the chemical analysis is to be the same for base and filler metals, measures (2) or (3) should be considered.
Besides these, there should be another means. Grain refinement of weld metal which solidifies from the fusion zone of base metal would be effective, if a certain measure were taken to make the grain size fine in the base metal adjacent to the fusion line. Cold working of welding groove by, for example, peening prior to welding would make the base metal recry stallize by subsequent heating of welding, make its grain size small.
In order to distinguish this process from the usually employed peening process, we christened it "Pre-peening", from which refinement can be expected not ont only in the heat affected zone of base metal, but also in the first loyer weld metal which is adjacent to the former.
The effect of Pre-peening on the reduction of cracking susceptibility as well as ductility in weldments was noticed in Cu-Zn, Cu-Si, Cu-Ni and Cu-Sn alloys. For alloys for which high preheat temperature was needed, this effect seemed to be canceled by increased heat input, which gave rise to grain growth before welding.
We may expect similar improvement in weld metal properties by use of Pre-peening in metals other than copper of similar metallurgical features.抄録全体を表示PDF形式でダウンロード (6232K) -
安藤 弘平1964 年 33 巻 2 号 p. 120-124
発行日: 1964/02/25
公開日: 2011/08/05
ジャーナル フリーEquation (8) shows the general expression of thermal equivalent current for a single phase source when many intermittent loads are connected. In the equation I1, I2……are currents, α1, α2. are duty cycles and φ1, φ2……are lagging power factor angles of individual loads.
The equation was deduced from equation (3) which shows the instantaneous source current, ε1, ε2……being unity or zero (See equ. (2).) whose probabilities of being unity are α2, α2…….
Equation (19) shows the result for A phase source of delta-connected three phase system of A, B, C with single phase intermittent loads.
The equation was deduced from (12), in which ka, kb, kc are as defined in equ. (13), za, zb, zc being the internal impedance of source transformers.
Equation (20) shows the result when the current, duty cycle and power factor are equal in a given phase, nA, nB, nC being the number of loads.
In the case of V-connection, where the C phase source transformer is disconnected, ka, kb, kc in equ. (19) arc given by equ. (24).抄録全体を表示PDF形式でダウンロード (323K) -
ビード形成の機構石崎 敬三1964 年 33 巻 2 号 p. 125-131
発行日: 1964/02/25
公開日: 2011/08/05
ジャーナル フリーThe mother drop in arc welding is always confined within the surface of penetration. The shape of the latter determines the shape of the former, and accordingly the shape of weld bead. In this paper, the author discussed on the inter-relationship among the surface of penetration, mother drop and weld bead, and the following results were obtained.
(1) If the surface of penetration, resulting from a very small fixed heat source, is shallow and its angle of penetration Op is less than the angle of contact θ0 of a molten liquid drop of the same metal, the contact line of the drop will slip inward and stand still leaving the bare surface of penetration.
(2) A similar bare surface is also conceivable on the surface of penetration in arc welding. If Op is smaller than θ0 at any point along the melting line, the bare surface of the base metal will be wide there, so that it will be liable to induce the direct digging action of the arc, causing uniform penetration along the melting line.
(3) The first approximation of the weld bead section is proved to be of a circular arch in the case of very small sectional area, or of the typical liquid drop shape with flat top surface under the gravitional force.
(4) Inter-relation between penetration and bead shape was explained, in the case when welding current and speed were fixed so as to keep the sectional area constant, and arc voltage was variable and then the self-regulation mechanism of weld bead configulation in arc welding was made clear.抄録全体を表示PDF形式でダウンロード (5084K) -
藤井 政夫, 佐治 実, 土井 丈士1964 年 33 巻 2 号 p. 132-138
発行日: 1964/02/25
公開日: 2011/08/05
ジャーナル フリーThe X-ray flaw detection of austenitic stainless steel welds has been complicated by abnormal beam transmission. This phenomenon is often detected as a linear faint contrast in a radiograph which easily produces a misleading image corresponding to incomplete penetration of welds.
This paper accounts for this contrast due to diffraction of X-rays transmitting through the welded zone where the anstenite crystals exhibit pronounced preferred orientation, as called columnar structure.
Several evidences of diffration contrast in continuous X-rays are obtained, and it is concluded that, in general, microstructures such as coarse crystals or preferred orientations in metals are expected to have influence on the X-ray radiograph.抄録全体を表示PDF形式でダウンロード (9386K)
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