JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 36 , Issue 5
Showing 1-5 articles out of 5 articles from the selected issue
  • 1967 Volume 36 Issue 5 Pages 476-549
    Published: May 25, 1967
    Released: August 05, 2011
    JOURNALS FREE ACCESS
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  • Kohei Ando
    1967 Volume 36 Issue 5 Pages 550-560
    Published: May 25, 1967
    Released: August 05, 2011
    JOURNALS FREE ACCESS
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  • Fumio Ueyama
    1967 Volume 36 Issue 5 Pages 561-570
    Published: May 25, 1967
    Released: August 05, 2011
    JOURNALS FREE ACCESS
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  • Atsushi Hasui, Shigeru Kitahara, Takeshi Fukushima
    1967 Volume 36 Issue 5 Pages 571-578,759
    Published: May 25, 1967
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    The gas velocity by the fluid dynamic method (shown in Fig.6 and the expression 2), the temperature distribution (shown in Fig. 14) and the mixing rate of air (as measured by the Orsat apparatus) (shown in Fig. 11) into the jet along the jet axis at various distances from the nozzle under the ordinary operating conditions for spraying process are experimented and some considerations of the results are made. Moreover, the flying velocities of the spraying powders (Al2O3, Mo and Nickelbase alloy) in the jet are measured by using the turning disc (shown in Fig. 1).
    The results can be summarized as follows.
    Under the conditions of the flow rate of operating gas 30l/min and the operating currents 450 and 550 A.
    (1) At the 50 mm' distance from the nozzle
    (i) Flying velocity of spraying powder
    Al2O3: 150-160 m/sec
    Mo: 100-105 m/sec
    Nickel-base alloy: 70 m/sec
    (ii) Gas velocity: 120-140 m/sec
    (iii) Temperature
    under current 550 A: 2, 200°C
    under current 450 A: 1.700°C
    (iv) Mixing rate of air: 55-65%
    (2) At the 100 mm' distance from the nozzle
    (i) Flying velocity of spraying powder
    A12O3: 140-150 m/sec
    Mo: 95-100 m/sec
    Nickel-base alloy: 60-70 m/sec
    (ii) Gas velocity: 40-50 m/sec
    (iii) Temperature (under current 450, 550 A): 800-900°C
    (iv) Mixing rate of air: about 90%
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  • Kohei Ando
    1967 Volume 36 Issue 5 Pages 580-581
    Published: May 25, 1967
    Released: August 05, 2011
    JOURNALS FREE ACCESS
    It is pointed out that the calorimetric estimation of the welding pool temperature described in Christensen and Chipman's report concerning slag-metal interaction in the pool is based on the misuse of the result of Wells's paper which treats the two dimensional heat flow in welding. Wells's paper shows that M=q/c pvdTf approaches 2 when vd/2α takes large values. Using this fact, they calculated the temperature considering q/2 is the heat content of the nugget when the nugget is in molten state, q being measured calorimetrically. It is clear, however, that the above mentioned Wells's result does not mean that q/2 is the heat content of the molten pool.
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