In the last arc of dragon ball (not z), they meet up again as adults and fight in the tenkaichi tournament where she reminds him of his promise to marry her (occured much earlier in dragon ball when they were kids), he remembers and keeps his promise, when he leaves on kintoun (flying nimbus) after he beats piccolo in the final, he grabs her and takes her with him. Dragon Ball Z starts with them being married and have Gohan.
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they get married on the last episode of dragon ball when goku has to save chi-chi's father from burning in the flaming castle episode 153
In around episodes 140-145 in Dragon Ball in the Tenkaichi Budokai (A.K.A: World Tournament)
They get married in episode 153 The End, The Beginning of Dragonball
episode 8 of Dragon Ball
Dragon Ball Z Kai episode 47