for ballasts without preheating 预热启动镇流器 ; 非预热启动镇流器
welding without preheating 不预热焊接
preheating fluorescent lamballast without starter 无启动器的预热式荧光灯镇流器
The traditional ballast starting, added high-pressure filament material suddenly without preheating, will take serious sputter and loss, and make the light turn black and scrap ahead of time.
传统的镇流器启动，未经预热突加高压灯丝材料会发生严重溅射损耗，导致灯管提前发黑报废。
Preheating unit by using Xiapu gas is introduced, the key point that welding casing can be preheated without getting into furnace has been achieved.
介绍了利用霞普气制作的预热装置，实现了压缩机焊接机壳不需进炉就能预热的关键。
First, the electricity at the beginning of the operation, the bottom electrode of low resistance, good electrical conductivity, without any preheating, nor will launch electrode can launch.
首要，炉子在开始送电操作时，炉底电极电阻低、导电性良好，用不着任何预热，也不必发动电极就可以发动。
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