To those who say maybe he’s just depressed -it is NOT ok for him to hit his kids that way that leave those type of marks. It is NEVER ok to do that. And the OP wrote that this is not the first time.
OP -I feel terrible for you, but YOU are the one that has the power to protect your children from physical abuse. Your kids are just children and they are relying on their mommy to help them. Your kids do not deserve to be treated this way. I don’t know if they will forgive you down the road if you did not do your all to help them.
I think you should take pba’s advice and call the Shalom task force ASAP. I’m not saying something can never be worked out, but maybe your husband needs a really strong reality check, such as you taking the kids & leaving -at least temporarily & seeing if he is willing to go to therapy.
Another thing is if you have a Rav that you trust (not necessarily your husbands Rav) I would call him as well and speak to him about the situation.
Hatzlocha