be welcome to (something)
To be expressly or freely permitted to have, use, or do something. You're welcome to the spare bed if you want to spend the night here. They're welcome to change the color if they are that unhappy with it.
welcome someone to something
to greet someone who has come into something or some place. I am very pleased to welcome you to Adamsville! They welcomed us to the party and showed us where to put our coats and hats.
welcome to, be
Be cordially or freely allowed to, as in You're most welcome to join us, or You're welcome to borrow my boat whenever you like. [1300s] Also see you're welcome.