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?

Friction welding
Forge welding
Ultrasonic welding
Electron beam welding

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Manufacturing And Production Technology
When the temperature of a solid metal increases,

Both strength and ductility of the metal increases
Strength of the metal increases but ductility decreases
Both strength and ductility of the metal decreases
Strength of the metal decreases but ductility increases

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