巻号一覧
50 巻, 3 号
選択された号の論文の17件中1～17を表示しています
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栗山 良員1981 年 50 巻 3 号 p. 227-229
発行日: 1981/03/05
公開日: 2011/08/05
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向井 喜彦, 内田 昌克1981 年 50 巻 3 号 p. 230
発行日: 1981/03/05
公開日: 2011/08/05
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深瀬 幸重, 森田 茂1981 年 50 巻 3 号 p. 231-235
発行日: 1981/03/05
公開日: 2011/08/05
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福井 太1981 年 50 巻 3 号 p. 235-240
発行日: 1981/03/05
公開日: 2011/08/05
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西間 勤1981 年 50 巻 3 号 p. 240-246
発行日: 1981/03/05
公開日: 2011/08/05
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小川 忠雄, 財前 孝1981 年 50 巻 3 号 p. 246-250
発行日: 1981/03/05
公開日: 2011/08/05
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斉藤 喜一1981 年 50 巻 3 号 p. 251-257
発行日: 1981/03/05
公開日: 2011/08/05
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吉村 亮一, 広瀬 洋一1981 年 50 巻 3 号 p. 257-261
発行日: 1981/03/05
公開日: 2011/08/05
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溶接部の靭性について中尾 嘉邦1981 年 50 巻 3 号 p. 261-264
発行日: 1981/03/05
公開日: 2011/08/05
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建築鉄骨溶接部の例佐藤 邦彦, 豊田 政男, 南 二三吉, 藤盛 紀明, 中辻 照幸1981 年 50 巻 3 号 p. 265-270
発行日: 1981/03/05
公開日: 2011/08/05
ジャーナル フリーIn the present paper, consideration has been carried out of the relationship between the defect detectability of NDT and the repair rate of welds and the reliability of inspected welds.
In order to get a certain high quality level of welds, critical level for repair Acr should be set smaller than the critical allowable defect size acr. That is, acr/Acr is the factor of safety to defect detectability of NDT.
The more setting smaller of critical level for repair or deteriorating the accuracy of defect measuring by NDT, the more repair rate of welds γ increases. Increasing of γ does not always realize increasing of the reliability of welds R. In the case of deteriorating of accuracy of measuring the defect, k decreases even if γ increases.
The reliability of welds increasess according to increasing repair rate in the case of increasing sampling ratio or in the case of inspecting with emphasis on higher defective joints even if sampling-ratio is equal to the case of random sampling.
Based on the above consideration, the decision method is discussed of the rational inspection method for assuring a certain reliability of welds and also minimizing the total cost of inspection.抄録全体を表示PDF形式でダウンロード (413K) -
太田 省三郎, 工藤 松一1981 年 50 巻 3 号 p. 270-277
発行日: 1981/03/05
公開日: 2011/08/05
ジャーナル フリーVarious mechanical methods of improving the fatigue strength were investigated by testing the base plate and cruciform fillet welded joint specimens of 40 kg/mm2-80 kg/mm2 class steels. The results obtained are summarized as follows:
1) If a peening condition is suitable to a material, the compressive residual stress induced by peening increases as a yield strength increases. As the ratio of applied cyclic stress range to absolute value of the compressive residual stress decreases, the waste of compressive residual stress by applied cyclic stress decreases and the effect of improving a fatigue life (strength) increases. Therefore, the peening effect can increase with incresaing the yield strength of material.
2) It is possible to consider that a suitable condition of peening is to add the compressive residual stress as large as a yield strength of the material used, and that ari over peening ravages a surface, and may rather result in a reverse effect.
3) As a result of increasing the yield strength of a weld toe and inducing. the compressive residual stress to a weld toe, by peening., a root failure occurs sometimes in the case of non-load-carrying type cruciform, fillet welded joint similarly in thee case of load-carrying type fillet welded double tee joint. Therefore, it is necessary to consider the critical leg length according to a treating condition of a weld toe, in a joint design.抄録全体を表示PDF形式でダウンロード (1893K) -
暮石 正義1981 年 50 巻 3 号 p. 278-283
発行日: 1981/03/05
公開日: 2011/08/05
ジャーナル フリーA mathematical solution, derived from heat flow, was proposed for determining pulsed TIG welding conditions for various thin plates. The justification of it was confirmed through experiments of welding with mild steel, stainless steel (18Cr-8Ni), Invar (35-36%Ni) and pure copper.
Welding conditions of various thin plates can be determined by some calculations and a few experiments if the thermal properties are given.抄録全体を表示PDF形式でダウンロード (2543K) -
益本 功, 平 博仁1981 年 50 巻 3 号 p. 284-290
発行日: 1981/03/05
公開日: 2011/08/05
ジャーナル フリーFine grained microstructure enhances grain boundary diffusion, so diffusion weldability of fine grained material may be better than that of coarse grained material.
Three types of diffusion welding specimens were prepared. Each abutting surface had coarse grained microstructure, fine grained microstructure, which was prepared from friction weld interface, and cold-worked microstructure. Third one was expected to change into small recrystal at diffusion welding temperature. These were welded by various diffusion welding conditions. And, tesnile strength and microstructure of weld, and deformation of specimens were examined in order to estimate the effect of prior microstructures on diffusion weldability.
Obtained results were as follows;
(A) Very fine grained microstructure, in which grain diameter was about 7 μm, was hardly to change into coarse grain even keeping at 1000°C.
This specimen could be joined at lower diffusion welding temperature than coarse grained specimen, in which grain diameter was about 100 μm.
(B) Cold-worked specimen started joining with onset of recrystallization into small grain.
Diffusion weldability of this one was between that of fine grained one and that of coarse grained one.抄録全体を表示PDF形式でダウンロード (3920K) -
溶接金属ミクロ割れ・横割れの防止矢竹 丘, 百合岡 信孝, 片岡 隆一, 常富 栄一1981 年 50 巻 3 号 p. 291-296
発行日: 1981/03/05
公開日: 2011/08/05
ジャーナル フリーIn the previous reports, the authors studied the effects of various factors on the occurence of cold cracks including root cracks, toe cracks and under-bead cracks in the heat-affected zones of base metals. They proposed the preheating temperatures necessary for the prevention of these cold cracks as a function of the chemical composition of steel, the groove shape, the restraint and the hydrogen content in weld metal.
There have arised cases where not only base metal cracking but also weld metal cracking must be considered in the selection of the preheating temperature, especially for the welding of steels with lower carbon contents. A number of cold cracking tests have thus been conducted in order to find the necessary preheating and inter-pass temperature, θpr*, for preventing cold cracking in multi-run weld metals.
The θph* is given by the following empirical equation as:
θph*(°C)=120+120 log (HJIS/3.5)+5(hω-20)+8(σB-83)
where, HJIS is the diffusible hydrogen content in weld metal by the JIS method (0.1 to 40 ml/100gr), hw the weld metal thickness (15 to 40 mm) and σB the tensile strength of weld metal (60 to 90 kgf/mm2).抄録全体を表示PDF形式でダウンロード (2345K) -
大出力電子ビーム溶接の実用化に関する研究(第1報)喜多 久直, 和田 辰治, 中崎 隆光, 圷 洋二, 加沢 義彰, 本島 修, 飯吉 厚夫, 宇尾 光治1981 年 50 巻 3 号 p. 296-302
発行日: 1981/03/05
公開日: 2011/08/05
ジャーナル フリーHeliotron E, which is a large-scaled device of Heliotron series, is in operation in Kyoto University. Target plasma parameters of this machine are as follows; plasma density 1×1020m-3, electron temperature 1 keV, ion temperature 0.8 keV and nτ 1018-1019 sec/m3. Plasma confining magnetic fields are produced by the helical coil current. To assure the accuracy of the helical coils, the high level of accuracy was required to the profile of the vacuum chamber. The vacuum chamber twists around the torus by 9.5 times and its poloidal cross section shows a race-track shape in any toroidal position. Major radius is 2200 mm and minor radius is 215.5 mm. The material is the high-strength non-magnetic steel which has low permeability (μ<1.4), high yield strength (≥40kgf/mm2) and special chemical composition (25Cr-12Ni-0.3N). The thickness of the wall is from 20 to 33 mm.
To make the vacuum chamber, 190 pieces were joined together by EB welding after the hot press forming.
A giant apparatus (6.5 m×6.5 m×3.5 m) was prepared and applied and a special re-focusing coil was used for the long beam welding.
The profile accuracy of the vacuum chamber has been controlled as follows; major radius ±3 mm, minor radius ±4.5-1.5 mm, where minus means the inner side.
X-ray and dye-penetrant quality of all welds was acceptable for ASME pressure vessel code and JIS. The laekage was less than 1.3×10-8 Torr 1/sec. The final pressure is 2×10-8 Torr.抄録全体を表示PDF形式でダウンロード (5664K) -
遠隔操作式TIG溶接機の計算機制御装置大前 力, 三宅 洋, 小園 裕三, 小山 高一, 荒谷 雄, 山下 善孝1981 年 50 巻 3 号 p. 303-308
発行日: 1981/03/05
公開日: 2011/08/05
ジャーナル フリーIn a nuclear power plant, a large number of pipes must be set in very complex and narrow places. A remote control pipe welding equipment is developed, in order to solve difficulty of welding in such a narrow place. Characteristics of this equipment are summarized as follows.
(1) All welding sequences are controlled by a mini-computer.
(2) From the information displayed on the screen of control panel, which inculdes a TV monitor, the operator can evaluate results of welding, torch positioning and the groove shape.
(3) The operating panel includes a keyboard which is used for parameter input and for communication with the welding equipment to make necessary adjustment.抄録全体を表示PDF形式でダウンロード (1505K) -
福島 貞夫, 福島 孟, 衣川 純一1981 年 50 巻 3 号 p. 308-314
発行日: 1981/03/05
公開日: 2011/08/05
ジャーナル フリーThe possibility of improving the ductility and notch toughness of underwater wet plasma welds was investigated by controlling the chemical composition of them using filler metals.
The welding environment was selected in fresh water under the pressurized condition of 10 kgf/cm2 [gauge].
Results of this experiment are summarized as follows.
(1) Two kinds of filler metals, one of them had the basic composition of 0.013 wt% carbon, 0.081 wt% silicon, 1.05 wt% manganese and iron as the balance-base filler metal-and the other was added 0.59 wt% titanium to the above-mentioned base filler metal, were shown the possibility of improving the ductility of single pass double Vee butt joint.
(2) Addition of niobium alone or molybdenum with boron to the base filler metal had less contribution to the improvement of weld metal ductility.
(3) It is necessary to reconsider the chemical composition of filler metal for filled pass in multi-pass welding, because the dilution of the deposited metal with the base metal in filled pass differs from that of the root pass.抄録全体を表示PDF形式でダウンロード (2121K)
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