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Volume 30, Issue 10
Displaying 1-6 of 6 articles from this issue
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Yutaka Kasamatsu1961 Volume 30 Issue 10 Pages 720-724
Published: October 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (355K) -
Activity of Oxygen of weld metalHochiyo Sakaki1961 Volume 30 Issue 10 Pages 725-732
Published: October 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESS(1) The effects of various elements on oxygen activity are estimated by the behavior of log (%FeO)/[%O] against weight percentage of elements. The effect of aluminium among these elements is strongest.
Manganese and silicon have a very slight effect on oxygen activity. Chromium and vanadium have the effects of a corresponding values with the steel metallurgy upon the oxygen activity.
(2) The equilibrum constants of each element about the reactions with iron oxide took the characteristic value according its capability of deoxidation.
The elements which have strong capacity for deoxidation usually take the higher values.
The values of K'Si become to lowest in the deoxidation by silicon, and increase proportionally by elevating the basicity of slag.View full abstractDownload PDF (516K) -
Effect of Preheat Variation on the Cutting EfficiencyKan-ichi Suizu, Takeo Yasuda1961 Volume 30 Issue 10 Pages 733-740
Published: October 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSBy using specially made tips with varying numbers and pitch of circle diameter (P.C.D.) of preheating orifices, a cutting test was performed. The results of the cutting was compared on the basis of the maximum cut thickness that has been introduced by the authors as a convenient criterion for determining cutting ability.
The cutting ability was found to increase with increasing numbers of preheating orifices surrounding the cutting orifice, if sufficient amount of acetylene gas is used, but the rate of increase in cutting ability decreases with increasing numbers of preheating orifices. The relation is expressed in the following formula :
mf=(1-ε-n+1/1.8)⋅m0
If insufficient acetylene gas is used, the cutting ability is below that given by the above formula, depending on the acetylene gas flow and P.C.D. of preheating orifices. The formula for this relation is expressed as follows :
m=(1-ε-a/F)⋅mf
where m, mf=a degree of cutting ability proportional to the cutting efficiency
m0=the maximum of the above, being peculiar to a size of tip
n=nos. of preheating orifices
α=acetylene gas flow per one preheating orifice
F=a constant depending on n, size of tip and P.C.D.
ε=the base of natural logarithm
From the results it was also found that many flames issuing from many preheating orifices are more efficient than a single flame of the same amount of acetylene gas.
In addition, the direction of a preheating orifice relative to the cutting orifice has no great significance so far as no loss of cut happens. The effectiveness of propane gas is by no means less than that of acetylene, if preheating variables are properly chosen.View full abstractDownload PDF (506K) -
Effect of Combustible Gas in Oxygen on the Cutting AbilityKan-ichi Suizu, Takeo Yasuda1961 Volume 30 Issue 10 Pages 741-745
Published: October 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSAs for oxygen impurities such as nitrogen, carbon dioxide and argon intentionally added to cutting oxygen, their effect on the cutting efficiency was investigated quantitatively at the early stage of this experiment and reported in an earlier paper of this series. The present paper reports the results of investigation made on the effect of the combustible gases, such as hydrogen and propane.
The results may be summarized as follows :
(1) When cuttig speed is lowered, cutting ability (the maximum cut thickness) generally increases until the speed falls to some specific level. However, when the speed fallsbelow this specific level, the cutting ability decreases rapidly.
(2) Combustible gas addition to oxygen seems to lower slightly such critical speed as above mentioned.
(3) Non-combustible gases have also a similar effect on the critical speed.
(4) Moreover, the addition of a small amount of these combustible or non-combustible gases to cutting oxygen enhances the cutting ability at slow cutting speed.
The results seem to have a close connection with the mechanism of cutting reaction itself, and the most reasonable explanation has been developed.View full abstractDownload PDF (3596K) -
Effect of The Alloying Elements on the Weldability of Titanium AlloysMinoru Okada, Shigeo Shin1961 Volume 30 Issue 10 Pages 746-757
Published: October 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSTitanium can alloy with almost all elements, but all of these have not good weldability.
In this investigation, were studied as to what structure and what composition of titanium alloys had good weldability.
Consequently, found that a or α+β titanium alloys containing a small amount of alloying elements, for instance, such as 3% Al-Ti alloy (α) or 2% Al-2% Mn-Ti alloy (α+β) had good weldability. And titanium alloys, seemed to have good weldability, were obtained adding to titanium less than 5% Al or 0.2% C (as α-stabilizer) and less than 4% Mn or 3% Fe (as β-stabilizer). Also, ternary titanium alloys have good weldability, if the total of α-and β-stabilizer is less than 6 % (however, β-stabilizer<α-stabilizer).
Then, the structures in weld metal (as welded) of titanium alloys which thought to have good weldability are as follows :
1) Coarse serrated α in α titanium alloys.
2) Coarse acicular α in α+β titanium alloys.
And the hardness in these weld metals was Hv. 200-300.View full abstractDownload PDF (19385K) -
Effect of the Alloying Elements and Heat Treatments on the Properties of Titanium AlloysMinoru Okada, Shigeo Shin1961 Volume 30 Issue 10 Pages 758-764
Published: October 25, 1961
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSIn this investigation, were studied how the properties were changed when various composition of titanium alloys were heat treated (heating and tempering), in order to study the composition ranges of strong titanium alloys.
Consequently, found that rather much alloying element, for example 7-15%Mn, must be added to titanium so as to obtain strong titanium alloys. And to strengthen still more these and other titanium alloys (α+β titanium alloys containing a small amount of β-stabilizer, such as 2%Al-2%Mn-Ti alloy), the alloy have only to be quenched from over (β)/(α+β) transformation temperature according to their composition.
The structure in strong titanium alloys obtained with above method are as follows :
1) Serrated α(α') in α titanium alloys.
2) Acicular α(α')+β in α+β titanium alloys containing a small amount of β-stabilizer.
3) β+fine α' or β only in α+β titanium alloys containing a large amount of β-stabilizer.
And the hardness in these titanium alloys was Hv. 400 to 550.View full abstractDownload PDF (3762K)
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