这个能量释放的不平衡，与很多工艺参数密切相关，如等离子弧压缩程度、切割速度及喷嘴到工件的距离等。
This energy release imbalance, closely related with many process parameters, such as plasma arc compression degree, cutting speed and nozzle to the distance, etc.
另外，过大的切割速度和过大的喷嘴高度都会引起切口上下宽度差的增加。
In addition, too much cutting speed and big nozzle height can cause and the increase of the poor incision width.
所以，选用尽量小的喷嘴高度对提高切割速度和切割质量都是有益的，但是，喷嘴高度过低时可能会引起双弧现象。
So, choose as far as possible to improve the nozzle of small high cutting speed and cutting quality is useful, but the nozzle at low altitude may cause double arc phenomenon.
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