During the production of large LSAW pipes a gap remains between the longitudinal edges of the bent plate. Using your Graebener® continuous root tacking machine you can close this gap accurately by pushing together the longitudinal edges. This way, the tacking lay can be optimally introduced to the open seam pipe in a subsequent process.
Graebener® continuous root tacking machines are ideally suited for pipe diameters up to 84" (2,134 mm) at a pipe length of up to 18 meters. The pipe is passed through the machine in a continuous process being guiding by pressure rolls in all four directions. The top rolls are located in a patented roller cage and can be adjusted like the lateral rolls for a precise guidance of the open seam pipe. Further, during the entire process, the welding gap is scanned by means of a 2D laser scanner. This way we guarantee an ideal positioning of the welding head to the welding gap and thus a constant tacking lay as an optimum basis for the subsequent submerged arc welding processes.
up to 18 m
External pipe diameter:
up to 84" (2,134 mm)
up to 75 mm
Graebener® continuous root tacking machines are designed for the integration into a pipe production line. The machine concept is based on the vast experience gained during the operation of our own Graebener® pipe mill up until the 1990ies.
During the engineering of the Graebener® continuous root tacking machine, we place special importance on ensuring an easy access to the welding unit and a simple and reliable operation of the machine.
The slewable operating panel is located at the outfeed side of the machine. From there, the operator can manually adjust all pressure rolls for the compensation of the plate edge offset – vertically and horizontally. For a better monitoring of the seam center, the machine is also equipped with a camera at the upper rolls. This way, the operator can manually adjust the lateral torch position.
The design of the Graebener® continuous root tacking machine is very robust and durable. The machine frame consists of an upper and lower traverse in a rigid welded plate construction. The upper and lower traverse are connected to each other by four pre-stressed columns. This way an optimum force distribution in your continuous root tacking machine can be achieved.