Mechanical Engineering - Workshop Technology - Discussion

Tube drawing is useful to make tube so, why we can not select drawing?

Is Spinning process valid for the long seamless tube?

Thanks all for explaining.

@Swati.

Drawing can't produce 2 meters long seamless tubes. So, Option D is correct.

Why drawing can't be used?

How come rolling? Explain, please.

The correct answer is Extrusion.

Extrusion is a manufacturing process that can be used to produce long, seamless metallic tubes with lengths of up to 2 meters or more. This process involves forcing a billet of metal through a die to create a continuous tube with a uniform cross-section.

Here's why the other options are incorrect:

- Drawing: While drawing can be used to produce tubes, it is typically limited to smaller diameters and lengths. Drawing involves pulling a tube through a die to reduce its diameter and wall thickness.
- Rolling: Rolling is used to produce tubes with welded seams, not seamless tubes. Rolling involves bending and welding a flat sheet of metal into a tube shape.
- Extrusion and rolling: This combination is not typically used for producing seamless tubes. Extrusion is sufficient on its own for producing seamless tubes.

Extrusion is commonly used for producing seamless tubes for applications such as:

- Aerospace.
- Automotive.
- Oil and gas.
- Power generation.

Note that other methods, such as pilgering or rotary piercing, can also be used to produce seamless tubes, but extrusion is a common and versatile method for achieving this.

For drawing we need a pre-existing tube.

For extrusion only the tube will be of specific size and thickness but by using rolling as well we can make the tube longer and reduce dia more.