| Budget Amount *help |
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥7,000,000 (Direct Cost: ¥7,000,000)
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| Research Abstract |
In the present work, the metal transfer mode, spatter loss, penetration and mechanical properties in gas shielded arc welding using a double shielding gas nozzle with argon flow as the inner shield and <CO_2> gas flow as the outer shield (MAG-CI) were investigated comparing with <CO_2> arc welding and MAG processes. The results are summarized as follows ;
(1) In the MAG-CI process, short circuit transfer, spray transfer,globular transfer and buried arc metal transfer modes were observed by hirh speed camera and still camera, and it is found that the metal transfer regions are changed by welding current,arc voltage and argon flow rate.
(2) When argon flow rate is 28%, the spray transfer region of MAG-CI process is almost the same region as that of MAG process(shielding gas: Ar + 20% <CO_2> ), however, when argon flow rate is less than 20%, it is not easy to get spray transfer.
(3) The spatter loss in MAG-CI process is 1/3 to 1/4 of that in <CO_2> arc welding process. (4) The mechanical properties of welded joint of SM50A steel by MAG-CI process are almost the same as that by <CO_2> arc welding process.
(5) It is certain that the shielding gas cost can be reduced to 42% of that in MAG process by using Mag-CI process.
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