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.

出版者

一般社団法人 溶接学会

雑誌

溶接学会論文集 (ISSN:02884771)

巻号頁・発行日

vol.1, no.2, pp.242-242, 1983 (Released:2009-12-10)

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

上山 且芳 深田 康人 山本 隆一 辰巳 光正 坂下 積 杉野 和男 鈴木 理三郎 大原 宗行

出版者

一般社団法人 溶接学会

雑誌

溶接学会論文集 (ISSN:02884771)

巻号頁・発行日

vol.21, no.1, pp.87-94, 2003 (Released:2004-06-30)

参考文献数

23

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Thermite welding is widely used in the world. In the Japan railway company group, the application ratio of this method is approximately 40 % every year. The reasons why the thermite welding method is widely used are that the equipment has good mobility and the total working time of that is shorter than that of the enclosed arc welding method on site. Moreover, the operating skill, which is required for thermite welding, is less than that for enclosed arc welding. This welding method used now was introduced into Japan from Germany in 1979. After that, the thermite welding technique has been improved and developed. A wide gap method is one of newly proposed thermite welding in Japan. The root gap of this method is three times for that of conventional method. Therefore, it is feared that welds produced by wide gap method have less fatigue strength than those by conventional method. Because a welding heat input of wide gap method is much larger than that of conventional method. In this investigation, a new process with rail head air cooling for wide gap thermite welding is proposed in order to improve fatigue strength of thermite welded joint on rails.

著者

佐藤 之彦 石田 宗秋

出版者

一般社団法人 溶接学会

雑誌

溶接学会論文集 (ISSN:02884771)

巻号頁・発行日

vol.22, no.3, pp.424-429, 2004 (Released:2005-08-01)

参考文献数

3

被引用文献数

1 1

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In previous study, flashing phenomena in square wave alternating current have been discussed for flashing control. The results give a suggestion that PWM inverter has possibility to control flashing phenomena in half a cycle. In this study, flashing phenomena control strategy for flash welding is discussed by use of PWM inverter power supply. The results are summarized as follows : 1 PWM inverter enables to control flashing phenomena in half a cycle. 2 PWM inverter control for continuous flashing is proposed.

著者

寺崎 俊夫 北村 貴典 城戸田 巌 石村 知樹 浜島 志伸

出版者

一般社団法人 溶接学会

雑誌

溶接学会論文集 (ISSN:02884771)

巻号頁・発行日

vol.21, no.1, pp.81-86, 2003 (Released:2004-06-30)

参考文献数

10

被引用文献数

8 12

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This paper deals with experimental data and a predictive method of longitudinal shrinkage and bending distortion which are important in the development of the high accuracy production system of the large welding structures. The longitudinal shrinkage and bending distortion can be calculated from the inherent force, namely Tendon Force, which is related to the total of the inherent strain. First the experimental values of the longitudinal shrinkage, longitudinal bending distortion and the inherent strain were obtained under various welding conditions. Next, the theoretical equation was proposed to calculate the longitudinal shrinkage and bending distortion from the inherent strain. As the results, the validity of the theoretical equation on the longitudinal shrinkage and bending distortion is shown by the comparison between values predicted from inherent force and experimental values.