First I’m not a knowledgable code person. I have spent years in the pressure vessel industry but on the machining side. I have my own company and we have a customer with a specific requirement.

In the past we have formed in specifically made dies, transition cones, elbows and tees in halves out of exotic high corrosion resistant materials ( titanium hastalloy, stainless). Our customer then takes the halves and welds them together and incorporates them into their vessels. This customer is an ASME code shop.

We have the opportunity to supply a very large quantity of parts to them however they do not want to weld them. They want us to supply them welded and ready for fitting and welding into their pipe spools.

If we formed them and had a third party code shop weld them would that cover us from a code point of view? Also what ASME code would this be governed by? B31?

Thanks in advance for the comments/help