Manufacturing And Production Technology
What is the type of joining process called, where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature is obtained?

Forge welding
Electron beam welding
Friction welding
Ultrasonic welding

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Manufacturing And Production Technology
Which of the following statement is wrong as regard to down milling?

The coolant can be poured directly at the cutting zone where the cutting force is maximum.
The surface milled appears to be slightly wavy.
It can not be used on old machines due to backlash between the feed screw of the table and the nut.
The chips are disposed off easily and do not interfere with the cutting.

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