巻号一覧
50 巻, 7 号
選択された号の論文の12件中1～12を表示しています
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稲垣 道夫1981 年 50 巻 7 号 p. 630-641
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (1144K) -
成田 圀郎1981 年 50 巻 7 号 p. 641-645
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (443K) -
鈴村 暁男, 恩沢 忠男, 田村 博1981 年 50 巻 7 号 p. 646-652
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーThe diffusion weldability of Fe-base heat-resistant alloy A286 with such interlayers as isothermally-solidificating after transiently-melting have been studied by microscopy, electron-probe-microanalysis, tensile tests and stress-rupture tests of the joints. The liquid phase diffusion weldability between dissimilar alloys of Fe-base A286 and Ni-base Inconel 713C was also investigated.
It was found more difficult to diffusion weld Fe-base A286 with transient liquid phase Ni-base interlayer including only boron for lowering the melting point of the interlayer than to diffusion weld Ni-base superalloys, because of the poor melting effect of the interlayer for Fe-base alloys. However, strong void-free joints of A286 were produced with the interlayer including both boron and silicon which moderately melted the base metal surfaces at the joint interface. With this interlayer, it was also found possible to diffusion weld Fe-base A286 to Ni-base Inconel 713C.抄録全体を表示PDF形式でダウンロード (10105K) -
シールドガス組成の影響小野 英彦, 寺本 富彦, 小幡 錬1981 年 50 巻 7 号 p. 652-657
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーEffect of chemical composition of shielding gas on the relationship between groove width and wire melting rate has been studied in GMA welding (shielding gas composition; 100 % CO2, 70 % CO2 + 30 % Ar, 20 % CO2+80 % Ar, 100 % Ar).
In DCSP, it was found that wire melting rate increased with increasing groove width, and wire melting rate became a constant. For instance, as shielding gas composition was 20 % CO2+80 % Ar and groove shape was square, wire melting rate increased as groove width increased up to about 27 mm (=boundary groove width). And over that width, wire melting rate became a constant. The value of boundary groove width became narrower as CO2 gas content was increased in shielding gas and welding current became higher. But in the case of using 100 % Ar shielding gas, any precise relationship between groove width and wire melting rate was not found.
In DCRP, characteristics of arc and wire melting rate were not affected by groove width in all cases of various shielding gas composition.抄録全体を表示PDF形式でダウンロード (413K) -
水素の放出と割れの直接観察渡辺 健彦, 岡根 功1981 年 50 巻 7 号 p. 657-663
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーThe direct observation of hydrogen bubble evolution and cracking behavior, such as initiation and propagation at a heat-affected zone (HAZ) was performed using the device with a microscope, and some new understanding were obtained. The site of hydrogen evolution almost usually located at sulfide inclusion clusion and/or liquated grain boundary, and the rate of hydrogen evolution had a maximum value at a certain tensile stress followed by decreasing with rise in applied tensile stress. As the peak temperature of a simulated HAZ was getting higher, the morphology of cracking was changed from transgranular with a lot of plastic deformation to intergranular with little plastic deformation, and the stress enough to initiate cracking became smaller. From these results, it seems to be most likely that hydrogen-assisted cracking has a close correlation with a partial melting occurred in a welded HAZ.抄録全体を表示PDF形式でダウンロード (6566K) -
粒界き裂発生応力に及ぼすSbの影響中尾 嘉邦, 西山 丈司1981 年 50 巻 7 号 p. 663-668
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーThe effect of antimony on the intergranular crack initiation stress at 600°C was investigated to clarity the mechanism of reheat cracking.
Two kinds of steels were used, one was crack sensitive A387-12, the other one was insensitive A533B-Class 1.
It is concluded that in these steels, antimony atoms segregate to prior austenite grain boundaries of simulated weld thermal cycle zone (peak temp.; 1350°C, 800°C to 500°C; 10 sec) during heating up to 600°C, and that the cohesive strength of grain boundary decreases in proportion to the content of segregated antimony.抄録全体を表示PDF形式でダウンロード (394K) -
欠陥位置,板巾,非貫通欠陥の影響に関する検討佐藤 邦彦, 豊田 政男, 岡本 修平1981 年 50 巻 7 号 p. 668-674
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーAuthors have carried out experiments and analyses of welded joints with defects under limited conditions that a joint width was 100 mm and defects were through-thickness notches. Therefore, in this report, the results of another various static tensile tests are discribed. As for another influence factors on joints performance, defect location, joint width and part-through-thickness defects are examined. In the present experiments, low-toughness weld metal is used to make fracture mode of almost specimens brittle even at room temperature.
One-side notched specimens show lower ductility and strength as compared with center notched and both-sides notched specimens. This results is attributed to a bending moment induced by asymmetric shape in case of one-side notched specimens. Tensile tests are carried out with specimens of 100 mm, 200 mm and 400 mm in width. Both fracture strain (G.L. =30 mm) and strength decrease with increasing joint width.
No appreciable defference in fracture strain and strength is observed between specimens with mechanical notches and those with lack of penetration type defects.
From view point of ductility, the equivalent through-thickness defect length (2â) of specimen having part-through-thickness defect (2a: length, t1: depth, t: joint thickness) can be estimated by
â/a=2⋅(t1/t)2 for 0.2<t1/t<0.6.
Overall strain(ε∞)-non dimensional COD(δ'=δ/2κεyα) relation for welded components with defects in steel framed structure is given by
δ'=δ/2κεyâ=0.6⋅(ε∞/εy)
This equation gives approximatly upper limit to experimental results.
As critical COD obtained by small bending COD test is smaller than critical COD obtained by tensile tests, it is appropriate to evaluate weld defects by critical COD obtained by small bending COD test and the previous equation.抄録全体を表示PDF形式でダウンロード (466K) -
溶接部寸法の影響瀬尾 健二, 平野 博幸, 佐藤 邦彦1981 年 50 巻 7 号 p. 675-680
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーIn the previous report, the effect of temperature on the fracture behavior and the strength of welded joints which were loaded paralell to the axis of weld were explained.
In the present report, the effect of the throat depth and weld length on the strength of these welded joints are explained experimentally and theoretically.
The results obtained are as follows:
1) The critical shear displacement which depends on temperature is not affected by the throat depth and the weld length.
2) The strength of these welded joints at low temperature are given theoretically as a function of temperature, throat depth and weld length. And its values agree well with the experimental values.抄録全体を表示PDF形式でダウンロード (384K) -
小川 忠雄, 財前 孝, 常富 栄一1981 年 50 巻 7 号 p. 680-688
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーHot cracking of Nb-containing austenitic stainless steel was studied.
The following results were obtained;
1) Hot cracking susceptibility of Nb-containing material increases detrimentally in both fully γ-phase and (γ+a)-phase weld metal when Nb content exceeds about 0.40%
2) C improves hot cracking resistance in case of high Nb content (0.78 %), but indicates hardly noticeable effect when the Nb content is low (0.26 %).
The effect of N on hot cracking is not so significant within the range of 0.015 % to 0.12 %.
3) Increase of hot cracking susceptibility is due to the segregation of Nb, C and N at grain boundaries, which was found on the crack fracture surfaces in the welds by Auger Electron Spectroscopy.
Based on these results, 40 mm thick plate of modified low-C, type 347 stainless steel was made and welded by GTAW, SMAW and SAW. Microcrack resistance of these welds proved to be quite satisfactory.抄録全体を表示PDF形式でダウンロード (8082K) -
アルミニウム合金溶接熱影響部の金属組織学的研究(第1報)圓城 敏男, 黒田 敏雄, 篠永 秀之1981 年 50 巻 7 号 p. 689-695
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーAn investigation has been made into the effect of relatively insoluble compounds on the aging characteristic in commercial Al-Zn-Mg system 7N01-T4 alloy by means of electrical resistivity measurement.
In the commercial AI-Zn-Mg alloy, the relatively insoluble compounds by additional elements such asCr, Mn, Zr so on and impurity such as Fe, Si have already precipitated during homogenization or hot rolling process. When the material is heated above the solution temperature as such as welds, the relatively insoluble compounds dissolve or precipitate more. According to the result of electrical resistivity measurement, the compounds precipitate more up to heating of about 500°C and dissolve above 500°C.
The compounds have hardly an effect on the natural aging characteristic and formation of G.P. zones.
But the compounds considerably influence the artificial aging characteristic at 120°C, for instance, the age hardening by the artificial aging increases with increasing the dissolution of the compounds.
When the compounds dissolve relatively, the age hardening is due to formation of G.P. zones and η' precipitates. But when the compounds precipitate more, age hardening hardly occur, because of the preferential precipitation of gross η'precipitates and the suppression of precipitation of G.P. zone and fine η' precipitates.
At the high temperature aging such as 210°C and 250°C, the compounds accelerate the precipitation of η' precipitates and η phase.抄録全体を表示PDF形式でダウンロード (3310K) -
暮石 正義1981 年 50 巻 7 号 p. 695-701
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーParameters bw and Am, the width and the cross sectional area of bead, were derived from two-dimensional interfacial tension theory to obtain a mathematical solution on the formation of penetration beads.
Some pulsed TIG welding conditions, average heat input qav, , and wire feed vw, were introduced through calculations of heat flow and geometry from proper combinations of bw with Am to give the convex shape to the bottom side of penetration bead.
An algorithm for these calculation processes was made to determine tube welding conditions and applied for experimental pulsed TIG welding.
Penetration beads under welding conditions obtained by the algorithm showed the excellent bead shapes which approximately agreed with the bead shapes predicted through calculations.抄録全体を表示PDF形式でダウンロード (474K) -
大電流MIG溶接金属の靱性に関する研究(第2報)渡邊 之, 小嶋 敏文1981 年 50 巻 7 号 p. 702-709
発行日: 1981/07/05
公開日: 2011/08/05
ジャーナル フリーIn the previous paper, the authors reported the fact that, when using the titanium and boron bearing consumable wire in the large current MIG arc welding, oxygen generated by the decomposition of CO2 in the shielding gas significantly affected both the microstructure and the notch toughness of weld metal. Besides, majority of both titanium and boron was revealed to exist in weld metal as the oxide inclusions in higher level of oxygen content.
This paper describes the metallurgical studies to aim to determine the inherent and complex effects of titanium, boron and oxygen on the refinement of microstructure of the weld metal. The main test-results are as follows:
(1) Titanium may serve to refine the microstructure of weld metal as the oxide inclusions. That is, γ boundaries can become pinned by these oxide inclusions in the δ to γ transformation stage, resulting into refinement of r grain. In addition, these oxide inclusions can become the nucleation sites of ferrite in the r to a transformation stage, resulting into fine acicular ferrite structure.
(2) The oxidizing of boron is retarded by titanium, and boron as solute atom still remains in the higher range of oxygen.
(3) The solute boron segregated in γ grain boundaries may suppress the nucleation and growth of proeutectoid ferrite.
(4) From the observation by electron microscopy and the analysis by energy dispersive spectroscopy, the fine dispersed inclusions in the matrix structure of weld metal were identified with the compound oxides of Ti, Mn, Al and Si.抄録全体を表示PDF形式でダウンロード (7652K)
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