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Volume 32, Issue 6
Displaying 1-7 of 7 articles from this issue
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Shumei Nishimura, Shingo Kurisu, Masahiro Otani1963 Volume 32 Issue 6 Pages 468-489
Published: June 25, 1963
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (3931K) -
Makoto Terada1963 Volume 32 Issue 6 Pages 490-494
Published: June 25, 1963
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (4234K) -
On Hardness MainlyShogo Kanazawa, Keiji Konno1963 Volume 32 Issue 6 Pages 495-502
Published: June 25, 1963
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSFrom the experimental rerults that the applied stress in cooling of steel promotes the Ar' transformation, it was investigated what are the effects of tensille stress under cooling upon the synthetic heat-affected zone of 80 kg/mm2 high tension steel. The results may be summarized as follows.
(i) It was shown that hardness decreased considerably when the stress was applied in the cooling process of Ar' transformation range and its decreasion rate rose in proportion to the stress. For example, when the stress was 19.6 kg/mm2, the hardness decreased by the amount of Hv 60.
On the other hand, the stress applied in austenite range had little effect on hardness.
(ii) Stress applied in Ar' transformation range resulted in an increase of elongation and re-duction of area of HAZ accompanied by a decrease of hardness and the formation of ferrite aad bainite was observed to be by the stress.View full abstractDownload PDF (4031K) -
Studies on Electron-Beam Welding, 4Haruyoshi Suzuki, Tatsuya Hashimoto, Fukuhisa Matsuda1963 Volume 32 Issue 6 Pages 503-513
Published: June 25, 1963
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSIn view of the lack of knowlege on the reason for the unique shape of bead and penetration in electron-beam welding, experimental and theoretical studies were performed on the mechanism of penetration and bead formation and the following conclusions were obtained
(1) The heat source in electron-beam welding is not a point source on the specimen surface, but a line source vertical to the specimen surface at the bead front.
(2) A wedge-shaped hole (deep crater) is formed by electron-beam in front of the molten metal and works as the heat surface. As the electron-beam passes on, this hole is filled up successively with molten metal.
(3) The wedge-shaped penetration is always directed parallel to the beam direction regardless of the inclination or position of a specimen.
(4) A wooden bowl-shaped bead top, formed near the surface of the specimen, is made by the heat flow from the molten metal which has been pulled up backward from the wedge-shaped hole.
If the beam happens to burn through the specimen with the molten metal flowing down, a wooden bowl-shaped bead top is no more seen.
(5) The width of weld bead can be predicted by the theory of heat flow. Experimental equation for the bead width (w) is given by
ω=k1{a×30/√(C×ρ×Tm+H)-2×Tm×K/(C×ρ×Tm+H)}
(6) The penetration of wedge-shaped bead is not explained by the above equation. However, experimental equation for the penetration (p) is given by
p=k2(C×ρ×Tm+H)0.5×(1-K4)View full abstractDownload PDF (10054K) -
Transfer and yield efficiency of metallic component in fluxesToshikage Ikkai, Fuminori Watanabe1963 Volume 32 Issue 6 Pages 514-521
Published: June 25, 1963
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSBonded fluxes are analogous to coated flux of manual electrode in the production method and the chemical composition of deposit metal can be easily regulated though addition of deoxidizers and alloy components in fluxes.
It is necessary to investigate the transfer and yield efficiency due to addition necessary alloy components in deposit metal.
This report is made to introduce an experimental equation from the relation between welding conditions and extent of penetration, deposit metal and melt slag and to estimate transfer and yield efficiency of alloy components in fluxes through chemical analysis of deposit metal.View full abstractDownload PDF (540K) -
Iwao Onishi, Masao Mizuno, Takehiko Hayashi1963 Volume 32 Issue 6 Pages 522-526
Published: June 25, 1963
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSIn these studies, authors intend to dicide suituble dimensions of the injector for low pressure type gas welding or cutting torch which give a stable oxy-acetylene flame.
As a preliminary experiment for investigation, the suction power of injector was measured through measurements of acetylene flow and pressure in the injecting part with combinations of four factors, one varied and three fixed : diameter of the nozzle (d), length of the injecting part (1), length of the mixing part (L) and diameter of the mixing part (D). Most suitable combinations were as follows :
(i) L=12mm to d=0.60 mmφ, D=1.6 mmφ, and l=1.8mm,
(ii) 1=1.8mm to d=0.60 mmφ, D=1.6 mnφ, and l=10mm,
(iii) D=1.6mmφ to d=0.60 mmφ, L=10 mm, and l=1.8mm,
(iv) d=0.60mmφ to D=1.6 mmφ, L=10 mm, and l=1.8mm.View full abstractDownload PDF (322K) -
Tsugihiko Satoh, Takeo Yamaguch1963 Volume 32 Issue 6 Pages 527-532
Published: June 25, 1963
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSTaking high speed motion pictures of the flashes generated in flash butt welding on mild steel Fe and Al, we could make the mechanism of the flash generation rather clear.
A very interesting phenomenon in flash generation we observed was, that a number of bubbles were produced by the passage of large electric current at one short-circuited bridge formed between two contact rods ; we concluded that the mechanism of this bubble generation was very much like that of an exploding wire, on which many researches are now proceeding in several countries.
Since the flashing is an explosive phenomenon due to more local heating around a short-circuited part, much more bubbles are generated than in the case of an exploding wire. This means a possibility in future of the research for metal explosion, using contact points between opposed surfaces.
Lastly, we found that many flashes were bubbles in the enlarged photographs of flashes that stick on glass surfaces. The auxiliary effect of CO2 gas in the explosion of mild steel is also described.View full abstractDownload PDF (8115K)
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