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Mathematical Modeling of Metal Active Gas (MAG) Arc Welding

Journal of Materials Science & Technology 2001年第1期17卷 167-168页

作者： takayoshi ohji Yoko Tsuji Fumikazu Miyasakn and Takeshi Yamamoto Department of Adaptive Machine Systems, Osaka University 2-l, Yamada-oka, Suita, Osaka, 565-0871, Japan Dep. of Adaptive Machine Syst. Osaka Univ. Osaka 565-0871 Japan

In the present paper. a numerical model for MAG (metal active gas) arc welding of thin plate has been developed. In MAG arc welding, the electrode wire is melted and supplied into the molten pool intermittently. Accordingly, it is assumed on the modeling that the thermal energy enters the base-plates through two following mechanisms, i.e., direct heating from arc plasma and 'indirect' heating from the deposited metal. In the second part of the paper, MAG arc welding process is numerically-analyzed by using the model. and the calculated weld bead dimension and surface profile have been compared with the experimental MAG welds on steel plate. As the result. it is made clear that the model is capable of predicting the bead profile of thin-plate MAG arc welding, including weld bead with undercutting.

关键词： POOL

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Heat Input Energy to Anode for Hollow Cathode Arc

Heat Input Energy to Anode for Hollow Cathode Arc

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The Fourth International Conference on Physical and Numerical Simulation of Materials Processing (ICPNS’2004)

作者： Hiroshi Nishikawa Shinichiro Shobako Masashi Ohta takayoshi ohji Collaborative Research Center for Advanced Science and Technology Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan Department of Adaptive Machine Systems Graduate School of Engineering Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan Collaborative Research Center for Advanced Science and Technology Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan Department of Adaptive Machine Systems Graduate School of Engineering Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan Collaborative Research Center for Advanced Science and Technology Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan Department of Adaptive Machine Systems Graduate School of Engineering Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan Collaborative Research Center for Advanced Science and Technology Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan Department of Adaptive Machine Systems Graduate School of Engineering Osaka University Yamadaoka 2-1 Suita Osaka 565-0871 Japan

In order to elucidate whether Hollow Cathode Arc (HCA) can be used for a welding heat source in space, the investigations into fundamental characteristics of the HCA have been experimentally performed under low pressure conditions. The HCA method enables an arc discharge to ignite and maintain under low pressure conditions, where it is extremely difficult for the conventional GTA method to form an arc *** the previous paper, it has been shown that the melting process by the HCA is very sensitive to process parameters, such as gas flowrate and arc length, and a huge penetration has been formed under the condition that the arc length is long and the gas flowrate is *** the present paper, the current distribution on anode surface and plasma property of the HCA under low pressure conditions has been made clear and the total heat energy to the anode has been discussed to understand the melting property of HCA welding. Result shows that HCA in the case of low gas flowrate is a high energy source and the high-energy input to the anode contributes to the huge penetration.

关键词： Hollow cathode arc Input energy Penetration Plasma property Low pressure arc

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