After looking at the broken LCA pictured I reviewed mine and took a couple of pictures.
What I see in the pictures are a forging and a tube that are butt welded.
The two parts are put into a locating jig that arc electricity between the two parts bringing them up to temperature and than pushes the two parts together quickly. I would assume they use air cylinders to accomplish this because of the speed required.
This process squeezes out the metal around the welded joint, Then the weld looks to be turned down on the OD leaving the metal on the inside of the tube.
Maybe not a bad idea to brace.