前言近来,电焊钢管向优质、大直径方向发展。随着用作管坯的钢卷轧制技术等方面的进步,制管技术也迅速地发展着。焊管壁厚也有不断增厚或减薄的趋向,而焊管材质越来越好。此外,为了省力和节能,在提高制管机自动化水平和改善其性能的同时,还迫切要求设备安全而无公害。 Foreword Recently, welded steel pipe to the high-quality, large-diameter direction. With the improvement of the coil rolling technology used as a tube blank, pipe making technology has also rapidly developed. Pipe wall thickness has also been the thickened or thinning trend, and pipe material getting better and better. In addition, in order to save energy and save energy, while improving the automation level of the pipe machine and improving its performance, it is also urgently required that the equipment be safe and pollution-free.