Assertion (A): In electron beam welding process, vacuum

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Assertion (A): In electron beam welding process, vacuum is an essential process parameter. Reason
(R): Vacuum provides a highly efficient shield on weld zone.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true but R is false
4. A is false but R is true

Correct Option: C

EBW is carried out in vacuum to avoid dispersion or deviation from the focus.