本文建立了开关式TIG焊电源的离散时域数学模型，分析了电弧引燃过程、引弧性能、电流波形特点和电弧稳定性。
The discrete time mathematical model of a switched TIG welding power source is established. The arc ignition process, its property, current wave form and arc stability are analysed.
该电源电弧容易引起周期性的熄灭和引燃，因此如何保证电弧稳定燃烧成为关键。
However the welding arc may be extincted and ignited periodically. So the arc stability becomes the key.
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