Hi,
Would like to know whether the usage of the following is correct or not.

Situation: When your friend is doing some work and you would like to help him.

Can we use "Will I?" in the above situation.

Please. Let me know what best can be used in such situations.

No. You would say "shall I join/help you?" or "may I join/help you?"

"will I join you?" makes no sense.

Is that what you were asking?