When Pip returns from the churchyard, where is Mr. Joe?

Joe is sitting in the kitchen when Pip returns from his graveyard encounter with the fearsome convict.
Pip learns through Joe the unfortunate news that Mrs. Joe has "ram-paged" out and is looking for Pip for the thirteenth time. Joe also informs Pip that Mrs. Joe has gone out armed with Tickler, a wax-ended piece of a cane she frequently uses to hit Pip.
From Joe's dialogue with Pip, we learn quite a bit about the family dynamics and also about both Joe and Mrs. Joe's natures. Joe is a good-hearted, quiet blacksmith with whom Pip feels a strong bond of affection. We see Joe protect Pip as best as he can from Mrs. Joe's wrath. Mrs. Joe, however, comes across as a hard woman who makes the young Pip's life a misery. Between the convict and Mrs. Joe, Pip is up against it as the novel opens.

In the opening chapter of Great Expectations, we find the protagonist, Pip—who begins his story when he is still a young child—in the graveyard in which his parents and siblings are buried. He seems to visit this graveyard with some regularity, but this occasion is singular because he meets a man who will become important in the later narrative: an escaped convict.
After his encounter with the convict, Pip immediately runs home to the house in which he lives with his sister, Mrs Joe Gargery, and her husband, Joe. Pip and Joe have a close kinship, which Pip describes as being the result of their experience as "fellow sufferers" of Mrs Joe. Mrs Joe certainly rules the household with an iron fist, despite the fact that Joe himself is a large man with a physical occupation. A blacksmith, he can often be found working in his forge, which adjoins the house.
When Pip glances at the forge here, however, he finds it dark and shut up, and consequently proceeds to the kitchen where he finds Joe sitting by the fire on his own.