Is it you are welcome or welcomed?

Excuse me, but I couldn't help but notice the phrasing in your sentence. May I inquire which form is more appropriate to use in this context: "Is it 'you are welcome' or 'welcomed'?" I understand that English grammar can be quite nuanced, and I'm always looking to refine my understanding. Could you please clarify the distinction between these two phrases and provide some guidance on when to use each? Thank you in advance for your insight.