JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 33, Issue 8
Displaying 1-6 of 6 articles from this issue
  • Toshio Ohwa
    1964 Volume 33 Issue 8 Pages 616-628
    Published: August 25, 1964
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Michio Inagaki
    1964 Volume 33 Issue 8 Pages 629-653
    Published: August 25, 1964
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
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  • Yoshihiko Sugiyama
    1964 Volume 33 Issue 8 Pages 654-660
    Published: August 25, 1964
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    This study has been made in order to obtain the basic guide for MIG spot welding of commercial aluminum alloys. In this study the effects of welding parameters such as welding current, arc voltage and arc time on MIG spot welds were investigated together with argon gas flow rate and after flow time. And the welding parameter guide for various sheet thicknesses was also chosen. To lower variations in strengths of MIG spot welds the use of a mechanized torch which is regarded as a kind of pull type torches was more effective than that of an oreinary push type semi-aut-tomatic torch. Therefore, it is found to be more desirable to use a pull type torch for MIG spot welding of aluminum alloys. Tensile shear strengths of MIG spot welds are reasonably high comparing with those of resistance spot welds required by U.S. Military Spec. MIL-W-6858 A. But some alloys such as 6061 and 5052 are seemed to be more susceptible to weld cracking than 1100, 3003 and N 5/6 alloys. Further systematic studies on the weld cracking in MIG spot welding should be necessary to make consistently crack-free welds.
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  • Iwao Onishi, Masao Mizuno, Takahiko Hayashi
    1964 Volume 33 Issue 8 Pages 661-670
    Published: August 25, 1964
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    When the oxygen gas was supplied to the injecting part of the low pressure type gas welding or cutting torch, without acetylene, the low pressure region was grown by the suction of the oxygen jet. Authors regarded the pressure (pa) in the injecting part as a expression of the character which the injector worked to acetylene flow in the welding or cutting. Experiments were investigated about influence of the some dimension in the injector parts on the p4- pressure.
    In the previous report, authors illustrated the role of the injecting part. In this report, continously, experiment was performed about effects of the some demension in the mixing part on the suction.
    Consequences of the experiment are as follows ;
    (1) When oxygen jet pass through the mixing part, suction which caused the oxygen jet is developed efficiently.
    (2) To get the most effective suction, the diameter of the oxygen jet is required to come, near the diameter of the mixing part.
    (3) The lowest p4-pressure was measured in the next combinations of the main dimension in the injector parts ;
    (i) D=1.4 mmφ, L=6 or 12 mm to d=0.99 mmφ and 1=1.8 mm
    (ii) D=1.2 mmφ, L=6 mm to d=0.60 mmφ and 1=1.8 mm
    (iii) D=1.2 mmφ, L=6 mm to d=0.46 mmφ and 1=1.8 mm
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  • Sadaaki Ekuni, Jun-ichi Hirai
    1964 Volume 33 Issue 8 Pages 671-677
    Published: August 25, 1964
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    The possibility of alloying can not be avoided at the interface between molten brazing filler metal and base metal in brazing, so the wettability of brazing filler metal can not be easily explained theoretically. We used the original apparatus for wettability test and investigated the relation between the wettability of brazing filler metals of Ag-P-Cu and Ag-Cu-Zn-Cd systems on copper and the silver content in brazing filler metals, one between the wettability and the test temperature, one between the wettability and the atmosphere, and the wettability of brazing filler metals of Ag-P-Cu systems on various copper alloys without flux.
    The conclusions are as follows:
    1) As to the wettability of brazing filler metals of Ag-P-Cu systems on copper, the wettability of BCuP-2, -6, -3 and -4, which contain less than 6 percent of silver, make little or no difference and that of BCuP-5, which contains about 15 percent of silver is excellent. As to the wettability of brazing filler metals of Ag-Cu-Zn-Cd systems on copper, the wettability of brazing filler metals containing from about 12 to 50 percent of silver increases with silver content in brazing filler metals and that of LAg-67Cd, which contanins more than 50 percent of silver decrease on the contrary.
    2) The wettability of brazing filler metals of Ag-P-Cu systems without flux in air atmosphere is less than the one and in carbon heater and in argon gas. The wettability of brazing filler metals of Ag-Cu-Zn-Cd systems with flux is not affected by the kind of atmospheres at all.
    3) The wettability of brazing filler metals of Ag-Cu-Zn-Cu systems on 6/4 brass in about 50 percent more than the one on copper.
    4) As the test temperature rises, the wettability of each brazing filler metal increases.
    5) Brazing filler metals of Ag-P-Cu systems wet copper, 5 percent phosphor bronze and 8 percent phosphor bronze without flux, but do not wet common copper alloys except them.
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  • Sadaaki Ekuni, Sadao Ishihara
    1964 Volume 33 Issue 8 Pages 678-683
    Published: August 25, 1964
    Released on J-STAGE: August 05, 2011
    JOURNAL FREE ACCESS
    As to impact-strength of brazed joints, there have been a few reports. They have not explained the relation between the impact strength of filler metals and that of the joints brazed with them, and also have not proved the state of fracture in brazed joint whose base metals as copper and copper alloys were weaker than filler metals.
    Authors investigated the relation between charpy impact-strength of filler metals and brazed joints using eight kinds of filler metals in Ag-P-Cu and Ag-Cu-Zn-Cd types and copper base metal. And we studied the fracture mechanism for various brazed joints, the effects of annealing for various filler metals and brazed joints and the influences of joint thickness in brazed joints for the impact strength.
    The test results summarized as follows :
    1) The impact-strength of filler metals in Ag-Cu-Zn-Cd type were stronger than that in Ag-P-Cu type and the impact-strength of both filler metals was improved by increase of silver contents in filler metals.
    2) The impact-strength of brazed copper joints was generally less than those of filler metals and it was determined by the impact-strength of filler metals.
    3) The fracture crack in impact specimens of brazed copper joints whose filler metals had higher impact-strength than base metal began from the boundary layer between filler metal and base metal. But, the fracture crack of brazed joints whose filler metals had less impact-strength than base metals began from filler metals. As a result, the absorbed energies in brazed joints had a large difference with both brazed joints.
    4) After diffusion annealing, impact-strength of brazing filler metals and brazed joints became weak in Ag-P-Cu type and strong in Ag-Cu-Zn-Cd type.
    5) When impact-strength of filler metals was higher than that of base metals, the thickness in brazed joints had no effect on impact-strength of brazed joints. But, when impact-strength of filler metals was weaker than that of base metals, the joint thickness gave some influences to impact-strength.
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