The folks over at Jalopnik have a good and extremely important article about the issues some owners are having with welds on JL Wranglers. The critical issue is the weld that holds the track bar to the frame, and the article includes photos and a video of the problem.
The track bar is what locates the front axle side to side, so if it goes so does directional control and steering—not a good thing.
If you own a JL Wrangler you will probably be receiving information about this, but in the meantime you might want to take action yourself. Reportedly FCA has issued a stop-sale order until the matter is addressed.