巻号一覧
29 巻, 11 号
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パトン電気溶接研究所の短絡移行アークの研究を中心に益本 功1960 年 29 巻 11 号 p. 845-857
発行日: 1960/11/25
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (12777K) -
渡辺 正紀, 佐藤 邦彦, 出口 義治, 菅原 哲二1960 年 29 巻 11 号 p. 858-866
発行日: 1960/11/25
公開日: 2011/08/05
ジャーナル フリーIt is well known that rolled steels have different mechanical properties by the testing directions. Ductility in the direction of plate thickness is especially inferior to the one in the rolling surface. The anisotropy in mechanical properties of rolled steels will have to be taken into consideration on the design and construction of welded structures in which the plate is subjected to tensile load in its thickness direction through fillet-weld joint. One example of the failures produced by the effect of the poor ductility in the thickness direction of rolled steels is pull-out type fracture in fillet-weld joints. It has been often experienced at the joints of through bracket and transverse bulkhead in oil tankers.
The pull-out type fracture will be affected by 1) the anisotropy of steels used, 2) difference in toughness between weld metal and mother plate and 3) stress distribution in fillet welds. In this paper effect of the factor 1) and 2) is investigated.
A new testing method, unsymmetrical double notch Charpy impact test of which specimen is shown in Fig. 1, is introduced to evaluate quantitatively the toughness of steel for pull-out type racture. In this test, crack initiated from the center notch of the specimen will pass through the other notch when eccentricity l of the notches is small, but it will not pass after the magnitude of l exceeds a certain limit. The critical value of l is denoted by lCR. The magnitude of lCR for steels tested is shown in Fig. 4 and Table 2. It has a close corelation to the anisotropy of the steels as shown in Fig. 6, and the double notch Charpy impact test seems to be very effective to evaluate the anisotropy of the steels.
In order to know the effect of the difference in toughness between weld metal and mother plate, U-notch Charpy impact tests as shown in Fig. 8 were conducted for some combinations of steels and electrodes. Area percentage of pull-out type fracture was adopted as a criterion. (see Fig. 9) Relation between the area percentage and lCR obtained by double notch Charpy tests is shown in Figs. 11(a)-(d). Steels welded by low hydrogen type electrode show greater area percentage of pull-out type fracture. Steels having greater anisotropy seems to have the tendency to cause much
pull-out type fracture.
The specimens which have greater area of pull-out type fracture showed lower energy absorption. (see Fig. 12). The area percentage of pull-out type fracture in the specimen seems to show no sensitive difference in the range of temperature between 50°C and 150°C. (see Fig. 13)抄録全体を表示PDF形式でダウンロード (599K) -
市販棒による球状黒鉛鋳鋼のアーク溶接本間 正雄, 和田 次康, 山谷 勝惟1960 年 29 巻 11 号 p. 867-871
発行日: 1960/11/25
公開日: 2011/08/05
ジャーナル フリーIn this report, the weldability of nodular graphite cast steel was investigated by using commercial electrodes.
On the single bead tests : In the heat-affected zone of single bead tests, the network cementite was observed when no preheat was applied, whereas with 600°C preheat, it was not observed. The graphite which was appeared in the heat-affected zone by annealing is finer than that of the base metal.
On the tensile tests of Butt welds : By using mild and high strength steel electrodes, the tensile strength more than 37kg/mm2 was obtained in the welding tests.抄録全体を表示PDF形式でダウンロード (5735K) -
気孔検査についての考察安藤 良夫, 藤村 理人, 生田 目真, 中崎 長三郎1960 年 29 巻 11 号 p. 872-876
発行日: 1960/11/25
公開日: 2011/08/05
ジャーナル フリーIn order to analyze gases included in the porosity of welds of aluminium alloy, we formerly constructed an apparatus of gas analysis and investigated the relation between several welding conditions and results of gas analysis on the welds.
In this paper, we report on a comparison of the results of several porosity inspections with the results of gas analysis on the welds. For porosity inspections, we have made codes of micrographic inspection and X-ray inspection. These codes are convenient for comparison of the results of gas analysis.
We have obtained experimental results as following :
1) In precise inspection, it is necessary to use micrographic inspection together with X-ray inspection.
2) Gas contents mainly hydrogen included in welds of aluminium alloy (NP 5/6) are about 1-3ml/100g at 0 percentage void.
3) According to the observation of the distribution of pores of each size, microporosities (<0.1mm pore dia.) seem to be an important factor of the deterioration of mechanical properties of the welds.抄録全体を表示PDF形式でダウンロード (4072K) -
植田 勇, 篠谷 寿1960 年 29 巻 11 号 p. 877-880
発行日: 1960/11/25
公開日: 2011/08/05
ジャーナル フリーIn our former reports, we chose an equal volume of ferric chloride and cupric chloride accordingly to patent as the liquid purifier. But the effective proportion has not been discussed in our experiments. In this point, the following results are obtained. By changing the proportion of ferric chloride and cupric chloride, its purifying power can not be varied. However, the precipitate (Hg3P2⋅3HgCl2⋅3H2O) is easily decomposed by addition of cupric chloride.
The relationship between the time required for regeneration and cupric chloride content in mother liquour is linear. A slightly excessive concentration of hydrogen chloride containing ferric chloride only can decompose the precipitate.
Therefore, in this connection it could be noted that presence of cupric chloride in liquid purifier is not necessary. Hydrogen sulphide presence in acetylene is not purified in exactly by water washing when its content is considerable amounts. With respect to the removal of hydrogen sulphide, stannic chloride is a versatile chemical agent, more than other known inorganic chlorides.抄録全体を表示PDF形式でダウンロード (259K) -
ミクロ割れ試験鈴木 春義, 中村 治方, 清水 信1960 年 29 巻 11 号 p. 881-886
発行日: 1960/11/25
公開日: 2011/08/05
ジャーナル フリーA study has been made of the effects of weld heat input, ferrite percentage and type of electrode on the microfissuring in multibeads deposited with stainless steel electrodes, D347, D308, D308L and 16- 8-2 (Cr-Ni-Mo).
The results are summarized as follows:
1) It was confirmed that microfi ssures in the austenitic stainless steel welds occured in intercrystalline.
2) The presence of ferrite about 5% or more in deposited metal obviated the microfissuring in multibeads.
3) The microfissuring was very sensitive to type of electrode coating and the lime coated electrode was remarkably resistant of microfissuaing than the lime-titania coated.
4) The multibeads deposied with the electrode D347 showed more sensitivity to microfissuring than those deposited with electrodes D308, D308L and 16-8-2 (Cr-Ni-Mo).
5) The microfissures appeared with random direction and were located preferentially along and adjacent to the boundary of a bead. Thus the reheating of a bead by the following layer may be a possible cause of microfissuring.
6) The increase of heat input and the accompanying decrease of cooling rate was found to be effective to reduce microfissures. The increase of welding current was very useful to obviate microfissuring.抄録全体を表示PDF形式でダウンロード (6776K)
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