Brad Pitt Will Fight For Joint Custody

Angelina Jolie isn't going to get her way when it comes to custody ... at least if Brad Pitt has anything to say about it, because TMZ has learned he'll fight and fight hard for joint physical custody of their 6 kids.

Sources connected with Brad tell us, Angelina is dreaming if she thinks she can take his kids away from him. We broke the story, Angelina wants sole physical custody of the children ... she wants a judge to give him visitation, but that's it.

Our sources tell us Brad says, "There's no chance that's going to happen." Pitt wants joint custody ... he doesn't want to interfere with Angelina's ability to be a co-parent, but he won't allow her to thwart him.

This now promises to become the flash point in the divorce and it has the potential to become a fierce legal battle.

That said, our Brad sources say he's quick to add Angelina's a "great mother" and doesn't want to hurt her in the divorce. The sources say Brad and Angelina haven't gotten along for months and have had frank talks about divorce several times, so this wasn't a shock. Nevertheless, he's still devastated.

As we reported, our Angelina sources claim Brad heavily indulges in weed and alcohol and that, combined with what she claims is an anger problem, poses a danger to their kids.

Our Brad sources insist ... he's never put his kids in danger ... ever.