Personally, I've never heard of the weld on a lug failing on a T/C barrel, and I've owned many of them in the last 30 years, as well as having been around Metallic Silhouette matches and numerous T/C shooters and hunters all of that time. I have full and absolute confidence also in any SSK barrel.
There are numerous after-market barrel manufacturers who have been around for various periods during that time. Some are great. Some are...not. I HAVE heard of, but never personally seen, failures on some of these.