"You're welcome!" ~ ครับ / คะ / ไม่เป็นไร ใช้หลัง "Thank you / ขอบคุณครับ" "Welcome!" ~ "ยินดีต้อนรับ"

You're welcome and welcome is not the same. Welcome. You use it for instance when somebody visit you and you say to him/her that: Welcome! Or here in Hungary when you arrive in a town or village there is a table with a writing: Welcome! And a doormat with this writing is common as well. You're welcome. You use it when you help someone or give someone something, and when the other person thank it for you, you replay him/her and say: You're welcome! So this means you did this with pleasure. I hope I could help you. :)

It is also used as an exchange of pleasantries. For example: the shopkeeper says to the customer 'thanks for your business today' and the customer replies 'you're welcome'. Have I explained that for you ok.