Welded vs. Seamless
The difference that makes a stainless steel tube welded or seamless is the way they are manufactured. Welded tubing comes from a strip of metal and is welded to make a tube while seamless tubing is made by extruding the steel from a bar of metal and then drawing it through a die to make the tubing.
These two processes lead the way for the nitty-gritty differences of these materials.
An advantage of the welded tubing option is that it’s normally the more cost efficient option when compared to the seamless option. Welded tubing is typically more cost effective because it’s less resistant to corrosion due to degradation that happens when welding all of the elements of steel together. Welded tubing is also more easily accessible because of not having to be drawn and annealed as much as seamless tubing.
An advantage of seamless tubing is its working pressure. There is a 20% increase in working pressure when you choose the same material and size in seamless tubing. Another advantage may be that it’s sometimes classified by users as the higher integrity product because there is no weld seam which could be viewed as a potential weak spot on welded tubing. Seamless tubing is often deemed more appropriate for critical applications.