巻号一覧
40 巻, 10 号
選択された号の論文の10件中1～10を表示しています
- |<
- <
- 1
- >
- >|
-
五代 友和, 竹馬 一紘1971 年 40 巻 10 号 p. 958-972
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (10524K) -
吉田 亨1971 年 40 巻 10 号 p. 973-977
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (3510K) -
三沢 昌之1971 年 40 巻 10 号 p. 978-988
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (9596K) -
小林 盛家1971 年 40 巻 10 号 p. 988-994
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (8909K) -
関口 春次郎, 三宅 洋1971 年 40 巻 10 号 p. 995-1000
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーFrom the viewpoint of the prevention from being cracked by welding, it is greatly significant to adopt a post heating process in order to bring down the hardness of the hardened part in the welding heat-affected zone. Though there may be various kinds of post heating process, it seems the easiest to make use of gas flames. It was, however, not easy to heat exactly the part containing weld metal and heat-affected zone below the Al transformation point or above the As transformation point or at any other desired temperature. But "A process for local heating at constant maximum temperature with gas flames", which was published before by one of the authors, has made it quite easy. In this work, the outline of this post heating process was described first, and secondly the result of the experiment in which post heating of welded Dart of high tensile steel was done by using the equipment for this process was clearly shown.
The experiment has confirmed that the hardened part in the welding heat-affected zone was surely softened by this process. Besides it was clarified that the hydrogen removal before immersion of welded part in glycerin was increased remarkably, if post heating is done just after completion of welding. But it goes without saying that the degrees of softening and hydrogen removal differ with the height of the maximum temperature and the proceeding rate of heating torch.抄録全体を表示PDF形式でダウンロード (1498K) -
温度曲線安藤 弘平, 津堅 房弘1971 年 40 巻 10 号 p. 1001-1015
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーTransient temperature rise is calculated by using the newly derived formula
n=eLR∝F0(δ)
which is reported in Reference (2). Temperature curves of many points near arc starting and stopping points are drawn and comparison between them and those of quasistationary state is described and discussed.
Fig. 1 and 2 show the calculated temperature curves of points which are illustrated in Fig. 3. The graphic way of drawing of these curves is shown in Fig. 19, 20
In these figures, the temperature rise as well as time elapsed are expressed in dimensionless quantities, temperature rise "n" is defined in equ. (1) and time elapsed vt=L is defined in equ. (3) and is illustrated in Fig. 4.
In Fig. I and 2, curves (1) show the temperature curves of quasistationary state of the given points and (2) show the half values of (1). Curve (2) is very convenient for the consideration of the transient temperature. Fig. 10 and 11 illustrate the general characteristics of the transient temperature curves compared with (1) and (2).
Fig. 5 and 6 show the maximum temperature, Fig. 7 shows the equithermal lines of maximum temperature and Fig. 18 shows it by experiment.抄録全体を表示PDF形式でダウンロード (2612K) -
溶接条件が溶込みに及ぼす影響安藤 弘平, 仲田 周次, 和田 宏一1971 年 40 巻 10 号 p. 1016-1025
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーIn previous report, we described the fundamental mechanism of penetration in electroslag welding considering the current and temperature distribution in slag pool.
In this paper, the influence of some welding conditions (i.e. welding voltage, welding current, slag depth, root gap etc.) on the penetration of base metal is described using a certain flux.
The experimental results are shown in Fig. 1-16. We see in Fig. 1 that the penetration decreases as the welding current is increased over a certain value under a constant terminal voltage. The decrease of penetration in spite of the increase of input power is worth notice, and the reason is given as follows. Fig. 7 illustrates the relation between the penetration and the wire tip position in molten slag pool. We know the penetration is affected by the mode of slag convection which is induced by the pinch effect of current flowing out from the wire tip. We see a poor penetration when wire tip is too near not to touch the molten metal pool, because the hot slag convection does not reach the side wall of base metal. When the wire feed speed is increased, the welding current as well as the steeping length of wire into the pool increases naturally under a constant voltage, and takes the mode of Fig. 7 (c).
For given current, we see the increase of penetration for the increa of welding voltage as shown in Fig. 3. Increase of input power may be one reasen, but the change of wire tip position from Fig. 3 (a) to (b) or (c) is presumed as the main powerful reason.
Effects of slag depth as well as root gap on the penetration shown in Fig. 11-14 can be understood in the same way.抄録全体を表示PDF形式でダウンロード (3871K) -
益本 功, 篠田 剛, 木内 良部, 尾崎 弘憲1971 年 40 巻 10 号 p. 1026-1031
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーIt is well known that carbon in steel increases its strength but decreases its ductility and toughness. Recent welding technology required to get higher strength and toughness of larger weld metal. It is not always easy to realize these objects
The purpose of this research is to know systematically the effects of elements of simultabeouly on the strength and toughness of weld metal. Especially the strength and toughness of extremely low carbon weld metal arenvestigated in order to find a proper electrode steel wire, which gives higher toughness and enough strength. Small tasted specimens were used for experiment instead of submerged arc weld metal. The results obtained as follows:
1. Extremely low carbon cast steel containing 0.01% C, 0.35% Si and 1.5% Mn gave excellent toughness and the same strength as mild steel.
2. 0.04% C cast steel gave the lowest transition temperature, compared as the lower and higher carbon cast steels.
3. The toughness of cast steel decreased steeply over 0.08% C or 2% Mn content.抄録全体を表示PDF形式でダウンロード (4294K) -
溶融銅への固体コバルトの溶解現象石田 恒雄1971 年 40 巻 10 号 p. 1032-1038
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリーA basic study on the dissolution of solid cobalt into molten copper was undertaken to obtain a fundamental knowledge in cobalt brazing. Cylinders were immersed in molten copper and then rotated under dynamic conditions of peripheral velocities from 19.0 to 61.5 cm/sec in the temperature range 1190°1340°C, the exposure time being from 45 sec to 120 sec. Rapid dissolvingof cobalt into molten copper occurred and the apperarnce of an etched surface after dissolution was observed. The rate of dissolution increased with an increase in temperature and rotational speed. A modified first-order kinetic equation was used to determine the dissolution-rate constants. These varied from 0.55 to 1.61 × 10-2 cm/sec depending on the temperature and the rotational speed, and were increased in proportion to 0.64-0.74 power of peripheral velocity. The activation energy for dissolution of solid cobalt into molten copper was estimated to be about 10.0 Kcal/mole. For a diffusion-controlled dissolution process, activation energy for dissolution is contributed to by the sum of activation energy for diffusion and some fraction of activation energy for viscosity. The dissolution rate of solid cobalt into molten copper is mixed-controlled.抄録全体を表示PDF形式でダウンロード (2743K) -
田村 博, 加藤 昇, 渡辺 健彦1971 年 40 巻 10 号 p. 1039-1050
発行日: 1971/10/25
公開日: 2011/08/05
ジャーナル フリー引張型の高温顕微鏡を使用して供試80kg/mm2級調質高張力鋼について高温変形下における結晶粒界の挙動を調べた.結果をまとめると,大要次の結論が得られる.
1)高温引張変形時の荷重一伸び曲線を求めた.この曲線にはいずれも変形途上で激しい荷重の変動が認められ,これが動的再結晶によって現われることを確かめることができた.さらにこの荷重一伸び曲線および変形の活性化エネルギーを考えて熱間変形下における組織変化を推定することができた.
2)1300゜Cでの変形で,変形速度が大きくなる程,粒界の移動速度は大きくなり,早く飽和量に達することを高温顕微鏡を用いて示した.
3)引張変形途上の粒界三重点の移動は,機械的な粒界すべりと原子拡散によると粒界移動によって起こることをマーカーを使って観察し,かつその移動は交互にジグザグに進行していくことを明らかにした.
4)動的再結晶粒を1100゜CでV5の低速度の変形に際して直接観察を行なった.高温顕微鏡を用いてのその表面組織のみから判断してではあるが,高温変形下での動的再結晶粒の核は,粒内の粒界近傍部に優先的にかつ偶発的に発生し,元の結晶粒界の移動によって生成されるのではないと結論した.抄録全体を表示PDF形式でダウンロード (12315K)
- |<
- <
- 1
- >
- >|