Abstract: For automatic setting of the roll position as per the targeted value in the process of size change- over of the HFW pipe mill, and for reducing material loss, a Cross Weld Tracking(CWT) model is developed by Baoshan Iron & Steel Corp., Ltd. independently. Described in the article are the main aspects of the said model, covering the work principle, the data-setting for auto-roll position change, the hardware and software as em- ployed and the framework of the Quick Setting System, etc. With the said Quick Setting System and via the CWT and the strip coil Product ID, the position of the forming roll is automatically changed following size change-over of the strip coil, and thus the pass change-over time is tremendously reduced(from the original 20 min. to 2 min.).