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Volume 35, Issue 7
Displaying 1-5 of 5 articles from this issue
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Masanobu Hamasaki1966 Volume 35 Issue 7 Pages 582-589
Published: July 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (5939K) -
On design of coupling system of ultrasonoc welderMinoru Okada, Shigeo Shin1966 Volume 35 Issue 7 Pages 590-598
Published: July 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSRecently, ultrasonic welders of several types are fabricated and are widly employed for working or welding of various materials in Japan
In previous work, authors had studied about the following factors on joining properties of various materials, such as ultrasonic power, tip pressure, joining time, conditions of the materials to be joined etc. However, had not studied about the effect of coupling system design of welder on joining properties of various materials.
In this study, we have investigated about the effect of design of horn seemed to the most important of coupling system having influence on joining properties.
We have obtained some informations as to essential relations between joining properties and design of horn.View full abstractDownload PDF (1689K) -
Kazutomi Hiratsuka1966 Volume 35 Issue 7 Pages 599-606
Published: July 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSThis paper deals with the spot welded pure titanium and problems in its welding.
The contact resistance was measured to select the optimum surface treatment operation. Both after degreasing and after wire brushing operation, it was in the range of 50-100 microhms but after pickling operation, it was decreased to the range of 20-30 microhms.
The formation of a spot weld is reflected in variation of voltage drop across the weld. The optimum welding schedule can be established by analysing the voltage drop variation.
Uniform weld size was found to be obtained without any care being taken to compensate for current shunting loss.
It was found that a variation in the electrode force over a considerable range did not affect the weld strengch, though the electrode force is an important factor deciding the amount of heat generated in the weld.
The weld strength of the spot weld was measured by tensile shear and normal tension test. The tensile shear strength can he expressed in simpler formula as a function of weld current and weld time.
(Tensile shear load S (kg/spot)=2400+8/5 I2⋅t⋅0-5, Tensile shear strength S' (kg/mm2)=2.24.105/I√t I=weld current, t: weld time
The weld strength tends to decrease as the weld current is increased.
The correlation of metallurgical structure of weld metal with weld strength has indicated that a welding schedule producing a fine grain weld metal is essential for securing optimum toughness.View full abstractDownload PDF (4494K) -
Weld Heat-Affected Zone Subjected to Multi-Thermal Cycles and properties of Multi-Quenched Steel Similar to Heat-Affected Zone (Report 2)Makoto Sato, Yoshinori Yamaguchi1966 Volume 35 Issue 7 Pages 607-620
Published: July 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSStudy is continued on the effect of multi-quenching thermal cycles similar to refined weld heat-affected zone on the mechanical properties of Ni-Cr-Mo and Ni-Cr-Mo-V-B high tensile steel.
Results indicate that those steels have as good mechanical properties as ferritic steels when subjected to multi-quenching thermal cycles with incresaingly lower heating temperatures and tempering in furnace.
Most suitable initial heating temperature locates around Ac3 temperature; however, quenching from Ac3 below makes the strength lower. Subsequent most suitable quenching temperature is between Ac3-Ac1 temperature range. In those cases a slight decrease in tensile strength appears, but notch toughness is much improved, when tempered in furnace.
Multi-quenching from just above Ac3 slightly lowered vTr15 transition temperature; however, it didn't give such superior impact properties as given by quenching from Ac3 above, then Ac3-Ac1 temperature range.
Multi-quenching from just above Ac1 retained large ferrite grains and impact properties of those steel were not so good as suitably treated steel.
From the results of microstructural studies it was presumed that those superior mechanical properties were developed as a result of refining of γ grains, agglomeration and spheroidization of carbides and sink effect with locally produced r when steel was reheated in later cycles.View full abstractDownload PDF (8721K) -
Effects of Enriched Oxygen in the Flame and of Deoxidizing Elements in Welding RodHarujiro Sekiguchi, Isao Masumoto, Mitsumasa Iwata1966 Volume 35 Issue 7 Pages 621-628
Published: July 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSAlthough propane has great advantages as fuel gas, it has been considered to be unsuitable for gas welding, for the combustion rate of propane-oxygen flame is low, and then its temperature is not enough high, and it is not concentrated.
In this study, two main subjects were investigated. One is of the effect of increasing of oxygen content in the propane-oxygen flame on the intensity of the flame to melt steel plate. The intensity of the flame was experimentally evaluated to record the time to start melting a constant dimmensional specimen. Flame was set on the center of the steel plate, 48 mm in square and 3.2 mm in thickness, and the time interval from the start of heating untill the first indication of fusion was recorded. The time interval is called as time to start melting. The other subject is a research of the possibility of welding of steel with this enriched oxygen-propane flame by using the welding rod containing much deoxidizing elements, i.e. silicon and manganese.
As the results, it proved that welding of steel with the propane-oxygen flame is possible, if much oxygen is enriched in the flame and a welding rod containing much deoxidizing elements is used. It was shown, moreover, that the welded joint with propane-oxygen flame has the same mechanical properties as those with oxyacetylene flame, that deposition rate with propane-oxygen flame increases with an increment of volumetric flow rate of oxygen in the flame, and that deposited metal became sound by proper enrichment of oxygen in the propane-oxygen flame.View full abstractDownload PDF (5674K)
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