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There are some sentences that do not require object pronouns:

Go.

Being one example, where the implied object pronoun (you) is omitted.

But can we have a complete sentence where both the subject and object are omitted, as in the case of 

(I) welcome (you) home
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    I am not a linguist, but I believe this is what they call an utterance in distinction to a complete sentence. – The Photon Jan 14 '20 at 20:44
  • @ThePhoton The opposite utterance is even shorter and even less structured : begone. – Nigel J Jan 14 '20 at 20:46
  • @NigelJ, I understand an utterance can be shorter, even just "uh" or whatever. But does it have to be? I thought that a complete sentence is a kind of utterance but not vice versa. – The Photon Jan 14 '20 at 20:48
  • @ThePhoton I would say that begone and welcome home are both utterances but are not sentences, but I await my betters to express their thoughts. – Nigel J Jan 14 '20 at 20:50
  • A sentence is an utterance that has a tensed verb and a subject in agreement with it. The subjects and verbs might not be there, like Get out of here and Never been as far east as Maine. But they'll be identifiable. If you want to say that begone is an obligatorily imperative verb, like beware, and you want to say that imperatives are present tense (they're actually infinitive forms, but you can call them tensed if you want), then Begone! is a sentence. Welcome back and Hello and Thanks are politeness phrases, which may still have shreds of grammar, despite being frozen. – John Lawler Jan 14 '20 at 22:46
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"Welcome home" is a complete sentence. Welcome serves as an imperative in much the same way as "Stand up" is considered a complete sentence. This is NOT an utterance or an exception to any rule

In the book, "Commands: A Cross-linguistic Typology" found on Google books, page 179, the example of "Welcome home" is given as a non-command form of the Imperative.

Commands: A Cross-linguistic Typology

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