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Volume 27, Issue 8
Displaying 1-12 of 12 articles from this issue
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[in Japanese]1958 Volume 27 Issue 8 Pages 425-430
Published: August 25, 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (444K) -
[in Japanese]1958 Volume 27 Issue 8 Pages 431-433
Published: August 25, 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (187K) -
1958 Volume 27 Issue 8 Pages 433-435
Published: August 25, 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (186K) -
S. Onimaru, H. Shomoto1958 Volume 27 Issue 8 Pages 436-441
Published: August 25, 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSTo increase wear resistance of electrode tip is one of important factor for productivity by spot welding.
This report gives some testing results for electrode of chromium bearing copper alloy.
It is found in it that the effect of heat treament on the durabiluty of the electrode and that, for an example, a heat treated electrode stands to make about 6000 spots under suitable cooling condition.View full abstractDownload PDF (1736K) -
E. Sugihara, S. Kikuchi1958 Volume 27 Issue 8 Pages 442-444
Published: August 25, 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSThe authors' previous method shown in the journal of Japan Welding Society in 1956 adopted a special reversible d-c control motor and a control box containing half wave dry rectifiers. This method, however, uses a small a-c motor which rotates only unidirectionally and a control box with a resistor. The welding current is controlled by connecting the control box between the electrode and the work.
Since the motor circuit is connected to the secondary terminals of the welding transformer and the starting motor voltage is set to be 60V, the motor never rotates during the arc time, thus resulting in high stability of circuit operation. On the other hand, application of the control box makes the motor voltage 70V, thereby the motor being able to rotate to adjust welding current.
The method has the following advantages :
(1)Non-use of control cables;(2)Non-use of relays;(3)Simpler circuit;(4)Smaller and lightercontrol box;(5)Operation with higher stability;(6)Easier maintenance;(7)Longer life.View full abstractDownload PDF (1156K) -
Effects of Kind of Welding Current, Polarity and Contents of Deoxidizers of ElectrodeH. Sekiguchi, I. Masumoto, H. Oda1958 Volume 27 Issue 8 Pages 445-450
Published: August 25, 1958
Released on J-STAGE: December 10, 2009
JOURNAL FREE ACCESSThough the low hydrogen type electrode can yield the superior mechanical properties of weld metal, its usability and arc stability is poorer than other kinds of electrodes. And more porosity of weld metal is observed in case of using this low hydrogen type electrode.
In this report, this porosity was examined with eighteen brands of the low hydrogen type electrodes in market and nine kinds of the similar type made for trial.
The results of experiments are as follows :
1. In case of adopting direct current reverse polarity, the porosity is less than that in adopting al-ternating current or direct current straight polarity, but it is not always possible to prevent the occurrence of pits or blowholes completely.
2. The porosity is the largest at the start of bead and comparatively large at the part of crater. At the middle part of bead, the porosity is smaller than other parts.
3. If the contents of deoxidizers, in electrode core wire or in coating of electrode, increase, the porosity shows a tendency to decrease.
4. The composition of coating of electrode has influence on this porosity and this is supposed to be based on the difference in their action to protect the molten metal in transfering and after deposition for the harmful atmosphere.View full abstractDownload PDF (3391K) -
A Consideration of the Self-regulating Characteristics of MIG ArcA. Uchida1958 Volume 27 Issue 8 Pages 451-456
Published: August 25, 1958
Released on J-STAGE: December 10, 2009
JOURNAL FREE ACCESSThe self-regulation in MIG arc is known to be resulted from three factors, i.e. (1) intrinsic self-regulation, (2) effect of power source characteristics, and (3) Joule's heat by electric resistance of wire. In this paper, they are considered theoretically and formulated in rather general standpoint. Then, especially of stainless steel (308) electrode wire, calculated values of parameters defining self-regulation are given and discussed.View full abstractDownload PDF (414K) -
On 46 and 49kg/mm2 Mild SteelsH. Sekiguchi, M. Inagaki1958 Volume 27 Issue 8 Pages 457-460
Published: August 25, 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSAbsorbed energies by non-notch-impact bend at 0°C and bend angles by non-notch-impact and slow bend of mild steels, of which ultimate tensile strengths are 46 and 49 kg/mm2, were investigated for various cooling times from A3 point to 500°C. In the neighbourhood of the critical cooling time Cf', the bend angle decreased with decrease of the cooling time for both steels. And both steels showed the decrease of absorbed energy over the critical cooling time Cf'View full abstractDownload PDF (276K) -
1958 Volume 27 Issue 8 Pages 460
Published: 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSDownload PDF (35K) -
On 52-57kg/mm2High Tensile SteelsH. Sekiguchi, M. Inagaki1958 Volume 27 Issue 8 Pages 461-465
Published: August 25, 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSAbsorbed energies by non-notch-impact bend at 0°C and bend angles by non-notch-impact and slow bend of five high tensile steels, of which ultimate tensile strengths are in the range of 52-57 kg/mm2, were investigated for various cooling times from A3 point to 500°C.
In the neighbourhood of the critical cooling time Cf', the bend angle decreased with decrease of the cooling time for all steels. And four steels showed the decrease of absorbed energy over the critical cooling time Cf', but a steel showed the increase of the energy over Cf'.View full abstractDownload PDF (363K) -
K. Okada, T. Fukaya1958 Volume 27 Issue 8 Pages 466-472
Published: August 25, 1958
Released on J-STAGE: June 12, 2009
JOURNAL FREE ACCESSIn reference to the operating characteristics of arc welding electrodes for mild steel, thermal expansion, thermal conductivity, hardness and microstructure and etc, in solid state ; viscosity and surface tension in liquid state ; and specific gravity and electrical conductivity in both solid and liquid states, of slag produced with five types of covered electrodes, i. e. D4301 (Ilmenite type), D4311 (High cellulose type), D4313 (High titania type), D4316 (Low hydrogen type) and D4320 (High iron oxide type) were determined and the results obtained are as follows ;
Electrode D4301 D4311 D4313 D4316 D4320
Inflection point on cooling curve °C 1124 1153 1218 1157 1138
Viscosity at 1500°C poise c. 10 c. 10 c. 10 c. 7 c. 10
Surface tension at 1500°C dyne/cm 350 to 400
Inflection point appeared on thermal expans 570 530 750 900 650
ion curve °C
Coefficient of linear expansion from 200°C to 8.3 11.5 4.3 9.9 10.0
inflection point X10-6
Electrical conductivity mho/cm
at 1000°C 3.0 6.7 6.9 2.0 3.0
at 1500°C 5.5 9.8 11.0 5.2 5.6
Thermal conductivity cal/cm/°C/sec
at 100°C 2.5 2.8 2.7 2.9 2.7
at 400°C 3.4 5.8 2.0 8.0 4.4
Specific gravity
at room temp. 3.6 3.6 3.3 3.1 3.9
at 1300°C (liquid) 3.0 2.2 2.2 2.0 3.1
Hardness at room temp. Mob's scale 8 8.5 8.5 6.5 6.5View full abstractDownload PDF (1734K) -
Water Washer, Drier, Purifier, Safety Valve and PipingI. Ueda, Y. Imai, Z. Murakami1958 Volume 27 Issue 8 Pages 473-479
Published: August 25, 1958
Released on J-STAGE: July 14, 2010
JOURNAL FREE ACCESSThe bad effects of phosphine and hydrogen sulphide have been frequently proved.
To remove chemical impurities it is necessary to pass through water washer, drier and purifier.
Water washing of the gas does not dissolves the phosphine at all, but other impurities can be removed and cooling the acetylene temperature.
To accomplish effectively the water washing, it is necessary to pass acetylene through 30 cm water layer with below 17 cm/sec (below 601/cm2/h.) at 20°C.
Acetylene drier is used with the object of drying the acetylene and otherwise the purifying power of purifier is greatly decreased.
In order to avoid the loss of pressure when the calcium chloride is too high, the layer of material should not exceed 30 cm depth.
Our conclusion from 30 cm depth experiments., necessiate acetylene velocity is below 28 cm/sec (below 1001/cm2/h).
In such case of gas running through calcium chloride layer, the relationship between calcium chloride consumption and acetylene temperatureis shown in Fig-7.
Acetylene passed through drier loss 20% of initial moisture.
In auther research on the regeneratable purifier which is widely used in our country, minimum passing time required complety fix the impurities is determined 45 second.
When the generating acetylene (water satulated) passed directly through the purifier, greatly decreases its purification power and then about half loss of power.
In welding or cutting practices using acetylene generators, safety valve is requested from safety regulation, but when we design it the acetylene velocity after passed the water layer in safety valve, necessietes below 28 cm/sec, otherwise accomplished moisture.
Finally, in order to search the relationship between acetylene pressure and delivery quantities at any sectional piping, authers calculated from the following equation.
Q=c/√1-m2⋅πD2/4.⋅√2gh/ρ
=α⋅1.375D2√h
=1.025D2√h
Where Q = m3/h
D=diameter of piping (cm)
h=pressure (mm. water column)
From this equation, table is given for the sake of convenience.View full abstractDownload PDF (443K)
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