著者

森 清和

出版者

JAPAN WELDING SOCIETY

雑誌

溶接学会誌 (ISSN:00214787)

巻号頁・発行日

vol.75, no.5, pp.371-372, 2006

著者

大西 厳 水野 政夫 浜井 栄 桝屋 禎祐

出版者

JAPAN WELDING SOCIETY

雑誌

溶接学会誌 (ISSN:00214787)

巻号頁・発行日

vol.20, no.6, pp.181-184, 1951

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金属板上に塗装されたペイント,パーニツシュ,ラツカーの類を能率的に取去るため酸素アセチレン火焔を利用することを試みた.ペイントバ一ナーはアメリカに求いては既に実用化されているようであるが,吹管の構造,実用効果等の報告には接していない.<BR>この目的のために重量約200gの多孔式吹管を試作し相当な成功を牧めた.すなわち酸素過剩焔としてペイント塗裝面にあて,塗裝物の燃燒後,残渣を針金ブラツシユでこすり落す.<BR>しかしながらペイントと称するものゝ中にも多くの種類があり,簡單に清掃し得るものとしからざる1ものとがある.概括的にはラツカドが最も燃え易くオイルペイント,エナメルペイントはこれに次ぐ.但し,オイルペイント中でも顔料の関係で難易がある.クロームエロー,ウルトラマリン等のペイントは困難であるが他の多くは燃燒除去を行い得る.<BR>木材面庭紙片が糊付されている場合は初に紙片及びその附近を充分水に丁しめらし,濡れた歌態において火焔をあてると紙片のみを燃燒し去り,木材面に少しの害をも興えない.紙片が極めて小なる場合には別に多孔式吹管を必要としない.

著者

寺崎 俊夫 福田 貴生 北村 貴典 増本 展祥

出版者

JAPAN WELDING SOCIETY

雑誌

溶接学会論文集 (ISSN:02884771)

巻号頁・発行日

vol.19, no.3, pp.564-569, 2001

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This paper deals with a fatigue strength of corner joint without backing plate using experimental data and numerical method. A lack of penetration is usually found at the root of the corner joint. The fatigue strength generally depends on the lack of penetration. From comparing between experimental data of fatigue strength and numerical results, it is shown that a stress intensity factor is useful for predicting the fatigue strength of the corner joint. The stress intensity factor is calculated under condition with changing main factors of corner joint. It is suggested that the plate thickness and the length of lack of penetration are main factors of the fatigue strength of the corner joint.

著者

瀬渡 賢

出版者

JAPAN WELDING SOCIETY

雑誌

溶接学会誌 (ISSN:00214787)

巻号頁・発行日

vol.72, no.7, pp.575-578, 2003

著者

前中 浩 佐久間 正明 松岡 一祥

出版者

JAPAN WELDING SOCIETY

雑誌

溶接学会論文集 (ISSN:02884771)

巻号頁・発行日

vol.4, no.1, pp.95-101, 1986

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The stress relief phenomena in pre-loading on butt welded plates and the changes of material properties owing to the pre-loading were investigated theoretically and experimentally. A over-matching welded joint composed of a 50kgf/mm<SUP>2</SUP> class weld metal by automatic CO<SUB>2</SUB> welding and a mild steel of 16 mm thickness was tested.<BR>The strain distributions measured by strain gages showed the same tendency to those calculated by FEM, under pre-loadings in directions perpendicular and parallel to the weld line. The perpendicular loading was superior to the parallel loading in terms of reducing the plastic strains caused of the stress releaving.<BR>Strain aging embrittlement of weld metal, HAZ and base metal obtained by 2 mm V notched Charpy test was quite proportional to prestrain, and significant difference among them could not be found. The equations for estimation of the brittle fracture initiation temperature were checked. The rise in the temperature caused by the pre-loading was less than that due to the weld residual stress. It was concluded that the effective pre-loading method recommended in the present paper was sufficiently safe.

著者

岡田 実 西口 公之 丸尾 大 谷 隆之

出版者

JAPAN WELDING SOCIETY

雑誌

溶接学会誌 (ISSN:00214787)

巻号頁・発行日

vol.36, no.1, pp.44-52, 1967

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An excellent dense and oxide free coating of Ni-Cr-B-Si alloy was obtained by the shielded plasma spraying method as shown in the previous report. The present report describes certain effects of spraying conditions, such as spraying atmosphere and preheating of substrate surface, on the quality of coating. And the application of shield nozzle and its effect are also investigated in details.<BR>Usually, plasma spraying of Ni-Cr-B-Si alloy in the air makes a porous and oxide inclusive deposit, even with use of pure argon plasma jet. It may be seen that some of these defects were caused by the oxidation of droplets in spraying. Air contamination into the plasma flame up to 90% was detected in the quantitative gas analysis of plasma flame at a distance of 90 mm from the torch.<BR>Spraying in argon atmosphere gave a somewhat better coated layer compared with the spraying in the air, but is far from being perfect. These results suggest that the protection of particle and substrate from oxidation is necessary but is insufficient for obtaining perfect coating. Furthermore, thermal problems in a process should be considered at the same time. As the result of atmospheric, thermal and kinetic considerations in the processes, shield spraying method has been proposed.<BR>In the shielded spraying of this alloy, the preheating of substrate has great effect on the bond between the coated layer and the substrate. For the specimen which is shield-sprayed without any preheating, a little amount of porosity was observed at the boundary. But almost perfect metallurgical bonding is accomplished with local preheating (300°C) of substrate surface.<BR>As for the application of shield nozzle, a series of experiments were carried out to analize the effect of nozzle. Results as follows;<BR>(1) Spraying atmosphere is kept perfectly inert.<BR>(2) Shield nozzle has an effect of raising the heat transfer from the plasma flame to the particles and substrate, since the contamination of cold gas is completely shout off.<BR>(3) Application of shield nozzle makes it easy to preheat the substrate surface with a high effluent of heat flux.<BR>(4) Temperature and velocity of particle rise as a result of increase of thermal efficiency and velocity of plasma flame.