Which of the following statements are the salient features of hydrostatic extrusion?
1. It is suitable for soft and ductile material.
2. It is suitable for high – strength super – alloys.
3. The billet is inserted into the extrusion chamber and pressure is applied by a ram to extrude the billet through the die.
4. The billet is inserted into the extrusion chamber where it is surrounded by a suitable liquid The billet is extruded through the die by applying pressure to the liquid
Select the correct answer using the codes given below:
(a) 1 and 3 (b) 1 and 4
(c) 2 and 3 (d) 2 and 4