The present paper describes an attempt to determine the effective conduction heat in arc welding. The total energy input to the arc is measured by the calibrated voltmeter and ammeter and the theoretical value of conduction heat is determined from the result of the first report. It is therefore the most important factor to determined the maximum temperature at any point attaind by welding heat. A great difficulty in making the necessary measurement is rapid heating and cooling rate of plate.
For the purpose of the determination of temperature, it is proposed that the estimation of the depth of metal penetration or the area of melted zone in base plate and also the depth of heat penetration or the area of zone heated above Ac₁ transformation point. It is because that the maximum temperature distributions of plate by the welding heat, produce the various microstructures of heated zone corresponding to the maximum temperature.
Comparing to microstructures of adjacent part of weld, the author shows the microstructures of low carbon steel specially treated at various temperatures by the short time local heating. Temperature at a point in distance 20mm. from weld line is also measured by the Ft-Pt.Rh thermo-couple and calibrated milivoltriicter.
From these experiments and the theoretical considerations, the effective conduction heat is deterniined in the various cases.

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1秒間800齣の高速度寫眞によつてヂ動熔接による電弧熔接中の諸現象を示す。使用電極棒に軟鋼裸電極棒、アルコス、フリート、ウエルドその他の被覆電極棒、アルミニウム、銅等の特殊電極棒にして、直流及び交流電源を使肌主として下向熔脚場合こ就いて示す。竪及び上向熔接の場合の現象も多少掲げ、各の場合こ就いて代表的の現象或は特異なる現象を示し、必要に應じては、これに對應する電弧電壓及熔接電流の變化な示すオツシログラムを掲げて現象な説明する。

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The rivetted joint of the pressure vessel which is exposed to the higher temperature, especially used for the chemical industry, can not stand against the so called "caustic embrittlement."
So that the electrically welded joint is replaced to the rivetted joint for these pressure vessels.
For this reason, it is necessary that the welded joint is not to keep the caustic embrittlcment. The welded joint will be caustic embrittlcment, unless it is annealed. Thus, the annealing of the .welded joint, used fur the pressure vessel, is neccessary to ciminate the quality of caustic embrittlemt
The annealing temperature should lie about 650°C.

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鉛の電氣熔接は從來餘り行はれて居らない。其主なる理由は恐らく鉛の熔融に蒸發の温度が低い爲であらう。然るに事實に於て鉛は電弧熔接、抵抗熔接共に容易に行ひ得る金屬にして、本文は電弧熔接並に抵抗熔接の實際に就て種々實驗せる所な述ベ、尚熔接に際しての注意事項を述べて鉛の熔接性を明らかにせるものである。
從來の空氣―水素、酸素―水素等の瓦斯熔接法に代るに電弧熔接法な以てすれば共速度、操作、經費等の點に於て遙に優るべきものあり、各種工業殊に化學工業力面に於ける利益は極めて大なるものあろな疑はない。

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