Is Jeep cracked frame repairable?

Yes, it can be welded.

Whether it will pass vehicle inspections..... I dont know. You can try to hide the repair with several layers of paint/undercoating etc

Either way you are going to want to get this fixed. Its not a simple as getting the welder and welding the crack, which you have to do. That fix will not last long and a new crack will form on either side of the weld.

You want to add a custom piece of metal that covers the crack and extends a few inches on both sides. The metal should have no straight lines or sharp corners, keep it curvy. This reduces stress and less chance of new cracks forming.

The link/pics below are examples of the new brace that covers the crack .

But note, these fixes are for smaller cracks. If yours is in worse condition, you may need a new frame. Depending on ease of access, you may be able to weld the crack and add extra gussets/ metal etc in the area...

I'm not a professional welder, so I can't give you a definitive answer, but I suppose if it's made of steel, then it can be welded... I doubt that it would be 100% safe to do so, but you should talk to a shop that makes this kind of repair to get the best answer.

most states dot's demand replacing the frame if it is cracked if it is welded and goes through an inspection they will force you to park it .