Seamless pipes is a term used to define the process,that does not have any welding seam. The presence of any seam on a welded tube acts as a weak point, however if the tube is seamless, it tends to

Stainless steel tee
Stainless steel equal tee
Stainless-steel-reducing-cross
Sstainless-steel-unequal-tee
Titanium Tee
Copper-nickel-forged-tee