Great project, welds you show look nice, please post your results. When working in heavy industry I did vendor evaluation in the PRC for several years. If you need massive titanium pumps for your desalination plant you will be looking at the PRC where code welders are a fraction of what we pay here and you may not bother to have QA/QC engineers checking things out as they are AS9100 and NADCAP certified. If your ti RD hanger is made by BMG Ti who make bicycle parts/hangers as well as parts for Airbus, GE, etc., you are golden. The difficulty you appear to have managed is the expression "buyer beware" is in my opinion very much more prevalent in their culture than here.