What's the difference between the forward extrusion and the backward extrusion of the aluminum tube?

The aluminum extrusion seam? Is there a big difference between the two?

Seamless aluminum tube production process: reverse through the core (hole) to form seamless pipeThe production process of aluminum tube seam: conventional tubes is generally used for combination die extrusion, which is produced by extrusion, is welded, the welding seam is automatically in high temperature.

Seamless aluminum tube production process: reverse through the core (hole) to form seamless pipeThe production process of aluminum tube seam: conventional tubes is generally used for combination die extrusion, which is produced by extrusion, is welded, the welding seam is automatically in high temperature.

Seamless aluminum tube production process: reverse through the core (hole) to form seamless pipeThe production process of aluminum tube seam: conventional tubes is generally used for combination die extrusion, which is produced by extrusion, is welded, the welding seam is automatically in high temperature.