With the increase of the train running speed, the requirements on the smoothness of the rails have become more and more strict.
随着行车速度的提高，对轨道的平顺性要求愈加严格。
The influence on the surface smoothness of parts is small and the slow increase and decrease of welding function reduces the spark flashing and burs during welding.
工件表面洁净度影响小，利用电流缓升，缓降焊功能可以减少焊接时产生的火花飞溅和毛刺。
The influence on the surface smoothness of parts is small the slow increase decrease of welding function reduces the spark flashing burs during welding.
工件表面洁净度影响小，利用电流缓升，缓降焊功能可以减少焊接时产生的火花飞溅和毛刺。
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