巻号一覧
21 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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可視酸素気流の長さと末廣ノズルについて中村 虔一, 中村 吉宗1952 年 21 巻 4 号 p. 105-108
発行日: 1952年
公開日: 2009/12/10
ジャーナル フリーAs the first step of the research on oxy-acetylene gas cutting, the authors measured the cutting speed under the same cutting pressure, thickness of plate and standard drag, using the controllable-speed gas cutting machine ; fitted No. 2 blow-pipe with No. 1 nozzle (1 mm dia.) and found the oxygas volume necessary to cut a meter length of the plates. Then the relation of the length of visible gas stream to cutting efficiency of blow-pipes was clarified and the tentative design and manufacture of a divergent nozzle with ρ the increasing ratio of cross-sectional area of nozzle was carried out and comparison made between cutting efficiency of this nozzle and that of a straight nozzle.
It is concluded that the length of visible oxy-gas stream of a nozzle can be regarded as representative of cutting efficiency and gas cutting speed can be raised 10-15/ with the divergent nozzle as compared with the straight one.
Further, there is a critical cutting pressure for increase of cutting speed to the diameter of nozzle, the value for 1.0 mm dia. being 5 kg/cm2.抄録全体を表示PDF形式でダウンロード (294K) -
銘柄格付試験合格率および熔着金属の不均質性について横田 清義1952 年 21 巻 4 号 p. 108-113
発行日: 1952年
公開日: 2009/06/12
ジャーナル フリーThe mild steel covered arc-welding electrodes marketed in Japan are slag shield type of which the chief ingredient is ilmenite (FeO. TiO2). They have been developed remarkably since before World War II, the number of brands, submitted for official approval, ten years.
The results of mechanical tests upon them can be classified into three categories in the following table, is e., class I, accounting for 16.5%; class II, 38%; and class III, 18.50, having no connection with the kind of the core wire.
Next, the author discussed on the heterogeneity of deposited metals, citing the difference of me. chanical test values of two test pieces taken from one deposited metal specimen, and proposed the allowable limit of these deviations as follows:
Tensile strength, 3.7 kg/mm2 and elongation, 12.2 % for tensile test. Charpy impace value, 4:5 kg-m/cm2 for inpact test.抄録全体を表示PDF形式でダウンロード (488K) -
鋼材の切欠感度識別に関する簡易試験法について(第1報)渡辺 正紀, 合田 進1952 年 21 巻 4 号 p. 113-124
発行日: 1952年
公開日: 2009/12/10
ジャーナル フリー一般に材料の切欠感度を識別するにはいわゆる遷移温度がcriterionとして用いられ,普通の機械試驗(たとえば引張試驗など)で鋼定する事はできないと考えられている
しかしながら工場において材料の遷移温度を求めることは非常に繁雜である.かゝる観点から筆者らは普通の引張試驗結果とUおよびVタイプ標準シヤルピー試驗結果を詳細に調査した.たゞし使用材料は代表的な本邦縁付鋼4種(第I,II表参照)で,試驗は-80℃～+200℃のゆ温度範囲で行つた.
引張試驗結果は第7-13図に示す如くである.もちろんこれらの結果から材料の切欠感度を識別することは困難である.そこで筆者らは次の如き原点および降状点から最大荷重点迄の歪硬化量を表わす量を採用した.(第20図参照)
φ=最大荷重点における真応力/最大荷重点における歪
φ'=(最木荷重点における真応力)-(降状点)/最大荷重点における歪
たゞし最大荷重点の真応力,σtおよび歪,εtはMc Gregorにしたがつて破断後局部收縮部より離れた点の断面積から算定した.(第5章の記号参照)
調査の結果φ,φ'の値について次の如き顯著な特性を得た。
(a)φ,φ'の値は-80℃～+100℃の温度範囲で一定を保ち,+100℃以上温度の上昇するにつれ大となる.(第王8,19図参照)
(b)シヤルピー遷移温度と上記-80℃～+100℃の温度範囲におけるφ,φ'の値との関係については第22,23図に示すごとくφ,φ'の値の大なる材料程遷移温度は高い.
以上の事実に基いて筆者らは材料の切欠感度に対するindexとしてφ,φ'を採用することを提案するものである.抄録全体を表示PDF形式でダウンロード (2724K) -
浮田 勇, 井上 信雄, 灰川 昭三1952 年 21 巻 4 号 p. 124-129
発行日: 1952年
公開日: 2009/06/12
ジャーナル フリーIn the case in which two bodies are joined together, the natural frequency changes according to the degree of joining. In view of this fact, the authors considered it possible to presume the strength of spot weld by measuring the natural frequency of spot-welded materials.
Theoretical study and experiments were conducted with materials of super-duralmin.It was ascer-tained by this that the theory coincides with the experimental results.抄録全体を表示PDF形式でダウンロード (407K) -
ガス熔接及び再熔解・鋳造実験栗山 良員, 本多 靖正, 吉富 英雄1952 年 21 巻 4 号 p. 129-136
発行日: 1952年
公開日: 2009/06/12
ジャーナル フリーIn the present experiments gas welding of nodular graphite cast iron (3 kinds of Cu-Mg, Fe-Si-Mg and Ca-Fe-Si-Mg system by casting methods) was mainly carried out supplementarily with remelting and casting experimentations of the same samples.
Concerning gps welding:
1) In order to take full advantage of the high toughness of this cast iron, the structure of welded parts was made as near as possible to the nodular graphite structure of mother plate.
This was accomplished by using welding core of same material and other cast iron and adding some Mg alloy to welding flux.
2) Welding was done by heat treatment so as to avoid the chilling and marternsite tendency of welded parts.
3) Mg alloy addition to the flux was found useful in developing graphite spheroids.
4) The results were compared with the data obtained from operations with other than the above non-castiron welding cores.
Concerning remelting-casting experiments:
1) Tendency of disappearance or fine-graining of graphite grain under heating temperature, of this cast iron and tendency of chilling effect with varying cooling velocity were observed to know roughly the cooling-speed effect on appearnce of spheroid graphite and chilling in welding.
2) Under the heating temperature of gas welding, some of the graphite grains become finer, but others remain to grow during the cooling process.
3) At the cooling speeds of weld metals, around 6°C/sec or less, (temperature range of melting point-A1 point), chilling did not occur.抄録全体を表示PDF形式でダウンロード (11230K) -
應和 俊雄, 雛本 節夫1952 年 21 巻 4 号 p. 136-137
発行日: 1952年
公開日: 2009/06/12
ジャーナル フリーIn the preceding papers one of the authors stated that nitrogen in the weld metal would have a noticeable effect of disturbing the systems of weld metals and that the cooling speed had little effect on the activation energy for stressrelief in the case of hand-welding. This time the authors used the unionmelt weld metals as the specimens observing the activation energies to prevent the personal errors in welding from influencing the state of weld metals, and to keep the welding conditions constant.
As a result of testing they reached the following conclusions:
1) Mn has little effect on the activation energies for stress-relief.
2) C, Si and P etc., have great influences, i. e., they increase the activation energies of weld metals and tend to greatly disturb the ferrite structure system in weld metals.抄録全体を表示PDF形式でダウンロード (2135K)
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