Thor is very strong, but not Hulk strong. And Mjolnir doesn't actually enhance Thor's strength. It just let's him control weather, fly, and gives him access to a number of other powers which have rarely appeared in comics and I'm not sure how many are even cannon anymore.
As for fighting the Hulk brute strength vs. brute strength, he'd probably lose eventually, but it would take a long time, and I doubt even Thor would resort to trying to simply trade blows with him (at least not after a while).
And yes, the Hulk did once stop the Juggernaut. He was a horseman of Apocalypse at the time and enhanced with some Celestial technology, but it wouldn't surprise me if he could just do it anyway if he was mad enough. The Hulk kind of has his own built in rage based deus ex machina that gets him out of pretty much anything.






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