Expander for All Diameter Pipe 

The mechanical expander is used to render pipe have extensional deformation so as to distribute the internal stress of pipe uniformly by expanding pipe on expanding head by axial force generated by expanding tools for qualified pipe after forming, inside and outside welding. By strict control the axial distance of tools the extensional deformation is under control as well so that diameter and roundness of pipe can meet API5L standard. During expanding, the pipe is also straightened by the straightening machine C/W pipe expander. 

Steel pipe expanding machine is a large diameter LSAW pipe production process of key equipment. It is located inside the pipe, outside welding and X-ray inspection, ultrasonic flaw detection, before the hydrostatic testing machine.

Before the diameter expansion, the inner wall of the steel pipe is rinsed by the front flushing device. During the rinsing process, the steel pipe is driven by the rotating roller to rotate around the horizontal axis. The purpose of the front rinsing is to wash away residual flux and the like on the inner wall of the steel pipe, Debris damage expansion tool.

Expansion of steel pipe using step-by-step expansion, through the cold expansion, the tension exceeds the yield limit of steel, so that it has a uniform deformation; diameter is designed to ensure the accuracy of steel pipe diameter at the same time, Straight, full circle, to improve the dimensional accuracy of steel pipe, steel pipe to effectively improve the pre-bending, forming, welding residual stress distribution. When the steel pipe is expanded, the inner wall of the steel pipe is lubricated. The purpose of lubricating the inner wall of the steel pipe is to reduce the friction between the inner wall of the steel pipe and the expanding tool in the expanding process. The inner wall of the steel pipe is wetted with the emulsion during the expanding process.

After expanding, the inner wall of the steel pipe is rinsed again. During the process of washing, the steel pipe is driven by the V-shaped lifting roller to move along the axis. The purpose of rinsing is to clean up residual oil, emulsion and scale and other debris when expanding.

Expander for End of Pipe 

Expander for End of Pipe 

Pipe expander is mainly used for expanding the pipe end of spiral welded pipe to let the different batch pipes or different manufacturing pipes to be the same. Then, the onsite pipe connection can be guaranteed.The pipe expander in our company is from Φ325 to Φ1620mm. The pipe wall thickness is from 3mm to 25mm. The material is from Q235B to X100. 

Process

Pipe Loading—Pipe Supporting—Head Feeding—Pipe End Expanding—Expanding Head Back Forward —Pipe Dropping—Pipe Exit