Mechanical Engineering - Workshop Technology - Discussion

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.

As the job required is 2 m long it will not be totally straight after extrusion so sometimes passing through rollers is essential to straighten the axis of such a pipe.

Why rolling can be used?

The only extrusion is possible because when use rolling welding can be provided for seam neither strength is much less.

Plug rolling operation : combination of extrusion and rolling adopted for producing seamless tubes.

@Swati.

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

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

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

In rolling and extrusion only it is possible other than anything.

Why extrusion only not possible, what is the need of rolling?