firing period
... firing key 引爆电键 firing period 烧成周期 firing range 烧成范围 ...
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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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