1992 Fiscal Year Final Research Report Summary
Spectroscopic Study of Boundary Layer Between Electrode and Arc Plasma
| Project/Area Number |
03452262
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
溶接工学
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| Research Institution | Osaka University |
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Principal Investigator |
USHIO Masao Osaka University Welding Research Inst. Professor, 溶接工学研究所, 教授 (80029248)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Manabu Osaka University Welding Research Inst. Research Associate, 溶接工学研究所, 助手 (20243272)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Arc discharge / Arc pressure / Heat input / Weld pool / Metal vapor / Cathode spot / Cleaning action / Plasma spectroscopy |
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| Research Abstract |
In order to make a further understanding of plasma arc processes, we observed the arc discharge morphologies and analyzed the effects of metal vapor on D.C. and A.C. arc welding by means of plasma spectroscopic method.
It is found that the arc voltage and anode heat input increase with elevating of working gas pressure. The anode heat input and arc pressure are influenced by kind of working gases. It is suggested that both anode heat input and arc pressure control the phenomena of metal vapor from weld pool.
In A.C. arc welding, the conditions of weld metal surface can be classified into two types, the White zone and Bright zone. For all kinds of Al alloys, cathode spots extend from weld pool to cleaning zone. Besides, different cathode spot number, radius and velocity are observed with different Al alloys. It is also suggested that both work function and vapor pressure of Al alloy control the phenomena of metal vapor from weld pool.
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