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Volume 38, Issue 1
Displaying 1-13 of 13 articles from this issue
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1969 Volume 38 Issue 1 Pages 3-6
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
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[in Japanese]1969 Volume 38 Issue 1 Pages 10
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
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[in Japanese]1969 Volume 38 Issue 1 Pages 11-22
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
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[in Japanese]1969 Volume 38 Issue 1 Pages 22-26
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
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1969 Volume 38 Issue 1 Pages 26-32
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
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Hiroshi Kihara, Michio Inagaki, Kazuo Ikeda1969 Volume 38 Issue 1 Pages 33-54
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
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Minoru Nakanishi1969 Volume 38 Issue 1 Pages 55-64
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSRelating to cutting oxygen pressure P0 and maximum cutting thickness Tm, cutting tests were made using several kinds of nozzles with the following results.
a) In case of applying proper pressure on divergent nozzle, Tm is increased with an increasing P0, and the increasing degree of Tm is in proportion to oxygen energy density at nozzle exit.
b) In case of applying excess pressure on both straight bore and divergent nozzle, Tm reaches a limit value with an increasing P0, and the limit value of Tm depends on design of nozzle.
c) Occurrence of shock wave in the oxygen jet with excess pressure is a cause of existence of the limit value of Tm.
d) Greater limit value of Tm is obtained with oxygen curtain nozzle than with conventional nozzle. The function of the shock wave in the cutting phenomena is discussed and made clear.View full abstractDownload PDF (5494K) -
1969 Volume 38 Issue 1 Pages 63a-64
Published: 1969
Released on J-STAGE: August 05, 2011
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1969 Volume 38 Issue 1 Pages 63b-64
Published: 1969
Released on J-STAGE: August 05, 2011
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Iwao Onishi, Ikuo Okamoto, Masaki Imachi1969 Volume 38 Issue 1 Pages 65-71
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSIn the adhesion of metal wthe ratio ofith polar high polymer adhesive, electrostatic forces i.e. image induction forces are created between the dipoles of adhesive and the charges induced on the surface of base metal. These forces are assumed to take part in adhesive force. Now, if adhesion is performed with an adhesive of which the dipoles are oriented, adhesive strength will change according to the degree of orientation. The present study was undertaken to ascertain the matter mentioned above and prove the existence and characteristics of image induction force.
Polyvinyl chloride (PVC) and polyethylene (PE) were used as adhesive agents. Adhesion was performed by heating the bonded part where the adhesive was applied. In order to orient the dipoles, the D.C. voltage was applied on the bonded part during bonding process and the effect of the D.C. electric field on adhesive strength was examined.
The results are summarized as follows:
If the electric field was made to act on PVC during bonding process, the test specimen was found to fracture at the ⊕ side of the voltage applied on adhesive-metal interface and it became evident that the adhesive strength of ⊕ side interface would increase and that of Θ side interface would decrease. The influence of the electric field at room temperature on adhesive strength was not observed.
Referring to PE, the influence of the electric field during bonding process on adhesive strength was not observed.
It is to be noted that PVC is a polar high polymer and PE is a non-polar one. If free ions are contained in ahesive, it should be taken into account that these ions will have the same effect as that of the charges of dipoles.View full abstractDownload PDF (1595K) -
Electric Characteristics of the Tungsten Arc in Argon AtmosphereToshio Yamamoto, Wataru Shimada1969 Volume 38 Issue 1 Pages 72-78
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSAn arc with straight polarity is formed between a 2% thoriated tungsten electrode and a water-cooled copper plate in argon atmosphere of 18 to 760 mm Hg, and the electrical characteristics of the arc is examined under the following conditions.
Pressure of atmosphere P : 18 to 760 mm Hg
Arc current I : 250, 450 A
Distance between electrodes L : 1 to 25 mm
The facts revealed are as follows.
(1) At reduced gas pressures a radiant sphere, so called "cathode zone", is observed in the arc just below the cathode. Though it is brighter and has higher energy density than the arc column, its potential gradient does not differ from that of the arc column. The radius of the cathode zone increases with decreasing gas pressure and is the same order of the mean free path of an electron at P=32 mm Hg and I=10 A.
(2) With the decrease in gas pressure, the arc is extended both upwards and sideways and its brightness decreases. Moreover the plasma stream from the cathode to the anode is weakened since electromagnetic pinch force decreases.
(3) Potential gradient of the arc column E decreases linearly with the decrease in log P. The measurement shows that the difference between E near the cathode tip and E at the other place of the arc column is reduced with the decrease in gas pressure.
(4) The sum, VA+K, of cathode drop VK and anode drop VA increases with the decrease in gas pressure. VA+K increases from 7 to 14 volts as P decreases from 760 to 18 mm Hg at I=250 A.View full abstractDownload PDF (1999K) -
Effects of filler metals on the weldability and several properties of weldsYoshihiko Sugiyama, Toshiyasu Fukui1969 Volume 38 Issue 1 Pages 79-85
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSA study was made of the effects of filler metals on the weldability of AI-Zn-Mg alloys.
Aging characteristics, mechanical properties, stress-corrosion cracking susceptibility of welds and weld cracking susceptibility were examined by means of Vickers-hardness, tensile, bending, Charpy impact, stresscorrosion cracking, weld cracking and other tests.
The results obtained are summarized as follows.
(1) Tensile strength of welds made with Al-Mg-Zn filler metal was almost equal to that of Al-Zn-Mg filler metal and that of Al-Mg filler metal showed the lowest value, while the age hardening of welds increased in the following order; Al-Mg filler<Al-Mg-Zn filler<Al-Zn-Mg filler.
(2) However, bending and Charpy impact properties of welds made with Al-Mg filler metal were most excellent, and those of Al-Zn-Mg filler metal were inferior to those of Al-Mg and Al-Mg-Zn filler metals.
(3) No appreciable difference in stress-corrosion cracking susceptibility and fatigue properties was observed in AI-Zn-Mg, Al-Mg-Zn and Al-Mg filler metals.
(4) Weld cracking susceptibility increased in the following order; Al-Mg filler<AI-Mg-Zn filler<Al-Zn-Mgfiller. However, weld cracking susceptibility of Al-Mg-Zn filler metal containing a small amount of zirconium was almost equal to that of Al-Mg filler metal.View full abstractDownload PDF (501K) -
1969 Volume 38 Issue 1 Pages 91-101
Published: January 25, 1969
Released on J-STAGE: August 05, 2011
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