焊接周期会产生几千安培的峰值电流。
A peak current of several thousand amperes flows during the welding cycle.
虽然更换焊嘴的周期缩短了，但是由此带来的残次品的增加以及焊接稳定性的下降。
The shortening of the changing period for tips will lead to lower stability in operations and higher number of inferior products.
该系统以弧长作为操作量，改变每个周期的脉冲峰值电流的宽度，以达到对焊接弧长控制的目的。
The arc length was taken as the manipulated quantity in the system and the peak current width of welding pulse was varied.
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