Which pair amount the following solid state welding processes uses heat from an external source P. Diffusion welding Q. Friction welding R. Ultrasonic welding S. Forge welding

Which pair amount the following solid state welding processes uses hea

1.	Which pair amount the following solid state welding processes uses heat from an external source P. Diffusion welding Q. Friction welding R. Ultrasonic welding S. Forge welding
A.	P and R
B.	R and S
C.	Q and S
D.	P and S
Answer» E.

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Which pair amount the following solid state welding processes uses heat from an external source P. Diffusion welding Q. Friction welding R. Ultrasonic welding S. Forge welding

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