you are welcome 表歡迎,不客氣, 請問you are welcomed用的時機及與you are welcome相比.謝謝?

别人多謝你, 你禮貌地回應”不用客氣", 就只有一種說法: (形容詞的welcome 作成語)
You're welcome!

其他用法(動詞或形容詞) 才廣泛地含 "歡迎(的)", "樂於接受(的)"... 等等 的意思.

~ You are welcomed "to" our company.  (動詞被動式; "to..."介詞短語作副詞) 
(active:  We welcome you to our company.)

~ You are welcome "to join" our company. (形容詞; "to..." 不定詞作形容詞補語)

You are welcome. 與 You are welcomed.是完全一樣的．
不過我是多用前者．我周遭的人也是習慣上多用前者．

Moana, Tui, and Maui 也是都用前者．