普通製作せられてゐる高周波發生裝置付交流電弧熔接器の高周波振動は、一般に少くとも3個の相異る周波數のものが發生し、普通考へられてゐる如く1個の振動ではないことを平易に解説する。實際に製作せられてゐるものの1例を擧げて,回路常數の如何によつてはラヂオ周波數の振動を發生し得ることを指摘し、以てラヂオに對する妨害除去の一手段を暗示する。更に火花放電によつて發生する高周波電流竝に電壓に就いて、陰極線オシログラムによつて説明する。

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In recent years, the process of electric arc welding has made very remarkable strides and has gained an important foothold in various industrial fields. A great deal of attention is now being given to the physical testing of metal deposited by the electric arc and considerable research has been, and is still being done, to improve the quality of the deposited metal.
One of the most important problems with which the welding engineer is confronted is the control of the temperature of the deposited metal during the welding operation.
The following reports represents the results of tensile tests of all-welded-metal which are deposited in the case of the various temperatures, heating and cooling rate of the deposited metal during the welding operation, namely, those giving changed unwelding-time between each layer in the weld. 67 kinds of mediumly coated electrodes were included in the 500 specimens tested-manganese, manganese-chrome, manganese-nickel, and manganese-nickel-chrome contained in the fluxes respectively-. In addition tensile tests on specimens turned entirely from the all deposited metal were made, from which the chemical analysis and hardness of the deposited metal, the ultimate tensile strength, the percentage elongation obeerved were tabulated in the order of increasing unwelding-time between a layer and layer for comparison and interpretation of results. The effect of unwelding-time are shown by grouping the specimens according to alloy element in. the flux and plotting curve for each groups, with values from tensile tests for ordinates and unwelding-time between a layer and layer for abscissa. These curves (results) are shown that even if all the conditions save the unwelding-time between a layer and layer were unchanged to all tests, the ultimate tensile strength, yield pt. and percentage elongation were different.
The chief conclusions that are drawn on the basis of these results are:
1) That the mechanical properties of welded metal is changed by temperature and umvelding-time between each layer (-cooling velocity of deposited metal-) of the weld metal during the welding operation.
2) That the depth of the effect of the cooling velocity of the deposited metal during the welding operation upon the mechanical properties of welded metal depends on the kinds and quantity of alloy element in the electrode used (of course, all the conditions are quite sanely.)
The author wishes that these suggestions and critisisms are invited to quide further work.
The writer acknowledges with thanks to the many courtesis of the Fujinagata Dock Yard Ltd. Co. for permision to publish the results. And, the present writer wishes to express his hearty thanks to H. Sasa, the chief of the department of ship building of the Fujinagata Dock Yard Ltd. Co. for his kind guidance, and to Assist. Prof. M. Okada of the Osaka Imp. Univ. for his valuable suggestions during the progress of this work.

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