著者

吹田 義一 佃 芳行 高木 隆 増淵 興一

出版者

社団法人溶接学会

雑誌

溶接学会全国大会講演概要

巻号頁・発行日

no.51, pp.86-87, 1992-09-01

著者

増淵 興一

出版者

公益社団法人 日本船舶海洋工学会

雑誌

造船協会誌 (ISSN:03861503)

巻号頁・発行日

vol.310, pp.18-20, 1954

著者

増淵 興一 小椋 陽 石原 芳忠 星野 二郎

出版者

The Japan Society of Naval Architects and Ocean Engineers

雑誌

造船協會論文集 (ISSN:18842062)

巻号頁・発行日

vol.1954, no.95, pp.161-171, 1954 (Released:2007-05-28)

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In case of constructing the welded steel ships, the wavy deformation of the shell plate is liable to occur by the fillet welding of shell plates and frames or floor plates.This unfairness may not only spoil the appearance of the shell plate but also reduce the buckling strength of it.This study was performed for the purpose of surveying the mechanism of origination and the method of reducing this deformation.The specimen used in this experiment is a constrained frame works as shown in Fig. 1. The deformation and the reaction stress originated in the plate due to welding were measured by the dial gauge and the electric resistance wire strain gauges respectively. These measurement were performed after the welding of each layer.The results obtained are summarized as follows:-1) Fundamental nature of this problemThis problem of residual stress can be treated as the problem of reaction stress originated by constraining the angular change due to welding. Accordingly, the angular change and the reaction stress can be calculated from the measured deformation using“beam theory.”2) Effect of welding procedures on the angular change(i) Weight of deposit metalAngular change due to welding increases as the increase of the weight of the deposit metal. There approximately exists a linear relation between the logarithm of the weight of the rod consumption and the angular change. Accordingly, it seems to be a benefit-able practice for reducing the deformation and reaction stress to decrease the weight of deposit metal or the leg length.(ii) Effect of rod diameterSize of rod diameter seems to have little effect on the angular change when the weight of deposit metal is equal.(iii) Effect of the degree of constraintDegree of constraint seems to have a remarkable effect on the angular change.Accordingly, the additional constraint, such as a kind of strong backs, attached to the shell plate may reduce the deformation and reaction stress.

著者

吹田 義一 増淵 興一 佃 芳行 寺嶋 昇 小笠原 正信 高橋 永

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.61, no.585, pp.2134-2140, 1995-05-25

被引用文献数

17

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The need to develop space welding technology as fast as possible is stressed for efficient repair and construction of space development projects. It is shown that in a vacuum like in space conventional GTA welding in which the solid tungsten electrode is used could not be applied. To solve this problem, the authors propose the GHTA process using a hollow tungsten electrode. An arc discharge could be started and maintained by flowing a trace amount of argon gas from the end of the electrode. In the proposed GHTA process, the stationary arc discharge which can be used as the welding heat source, starts after several seconds of the transient arc discharge. Also, the characteristics of arc discharges and penetrations due to the GHTA process in a vacuum are clarified.