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Is to roll the steel strip of different sizes to the corresponding tube blanks of straight seam continuously through roll type forming, cage roll forming and FF/FFX forming ,then heated the tube edges to the welding temperature via high frequency induction or contact heating and completed the welding under the extrusion of the squeeze roller, after cooling ,sizing and strightening to be the requested straight seam steel pipe. Mainly composed by the forming section, the welding section, the sizing section, the transmission system and the electrical system etc.