正常焊接状态时变频控制交流脉冲频率。
Varying frequency is used to control AC pulse frequency in normal welding state.
管线清管的目的是清除焊接时留在管道内的泥沙、焊渣等杂物，为管线测径和管线正常运行提供保障。
The purpose of the pipeline pigging is clear in pipe welding of mud, welding slags sundry, for pipeline caliper and normal operation of pipeline to provide security.
对导轨的安装和焊接采用了合理的工艺，还对导轨进行了防腐处理，从而保证了清污机的正常运行。
To ensure the normal running of the screen cleaner, more reasonable technology on installing and welding the lead rail were adopted, and anticorrosion treatment of the lead rail was carried out.
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