Which pair among the following solid state welding processes uses heat – McqOptions

MCQOPTIONS

1.	Which pair among the following solid state welding processes uses heat from 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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