Also a TST owner and a big fan of their quality. I got my frame from their former frame engineer and learned a lot about the company. The following excerpt is from their website and the picture is the bottom bracket area on my frame - which is also my avitar.

TiSport's weld quality is unsurpassed in the industry. Each TiSport welder is required to pass college courses and rigorous in-house training and tests before being allowed to weld on any product. Root passes are done on every weld before the final pass and as many as three weld passes are used on certain critical joints. Tubes are mitered prior to welding so precise that no visible gap is present before welding. The attention to detail in our weld procedure and our unique, proprietary weld fixtures ensure the finest quality welds possible.