Which two of the following joining processes are autogenous?

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

1. i and iv
2. ii and iii
3. ii and iv
4. i and iii

Correct Option: A

Autogeneous → No filter material is used so Diffusion welding & friction welding