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主要介绍了所研制的变极性等离子弧焊接系统,包括:主弧电源、维弧电源、等离子焊枪、电源配套系统以及计算机控制系统等,对系统的设计和关键技术突破作了较为详细的阐述.采用该系统焊接了4 mm、5 mm、12 mm厚铝合金试片和5 mm厚筒形结构件,焊缝内部质量符合QJ2698-95中I级接头要求,气孔符合MIL-STD-2219标准.

参考文献

[1] Nunes A C .Variable polarity plasma arc welding in space shuttle external tank[J].Welding Journal,1984,63(09):27-35.
[2] Hung R J et al.Characteristics and performance of the variable polarity plasma arc welding process used in the space shuttle external tank[R].N92-13 431
[3] Jaffery W S .Robatic variable polarity plasma arc (VPPA) welding[P].N93-25 605
[4] Abdelmessih A N .Heat flow in variable polarity plasma arc welds[P].N93-17 280
[5] Hung R L et al.The variable polarity plasma arc welding process: characteristics and performance[R].N92-12 279
[6] Abdelmessih A N .Heat sink effects in variable polarity plasma arc welding[P].N92-15 851
[7] Walsh P W .Examination of the physical processes associated with the keyhole region of variable polarity plasma arc welds in aluminium alloy 2219[R].N88-15 634
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