Which two of the following joining processes are autogenous? i. Diffusion welding ii. Electroslag welding iii. Tungsten inert gas welding iv. Friction welding

Which two of the following joining processes are autogenous? i. Diffus

1.	Which two of the following joining processes are autogenous? i. Diffusion welding ii. Electroslag welding iii. Tungsten inert gas welding iv. Friction welding
A.	i and iv
B.	ii and iii
C.	ii and iv
D.	i and iii
Answer» B. ii and iii

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