Need not preheating, turn a few minutes to reach set temperature.
不需预热，开机几分钟内即可达到设定温度。
Welding is not good, easy to crack, preheating before welding shall be.
焊接性不好，易产生裂纹，焊前应预热。
Diesel engine water preheating system can ensure start in low temperature areas.
柴油机水预热器系统可确保严寒地区低温起动。
Preheating is required if either of these two conditions are not met.
如无法满足两个条件中任意一条，则需要进行预热处理。
Preheating temperature shall be kept uniform from the start to the end of welding.
预热温度在焊接开始到结束期间应保持均衡。
Preheating process is very important because it affects machining quality directly.
预热效果直接对加工质量产生很大的影响。
Preheating process is very important because it affects machining quality directly.
预热效果直接对加工质量产生很大的影响。
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