Greetings, \ I am in a hurry so i thought i would post this question while i do my research.
We have a situation where we need to weld SS 316 Sch 40 pipe to a A572 Grade 50 smoke stack. The weld call out is for a CJP where the Stainless pipe sleeves inside the smoke stack with a reinforcing fillet weld on the outside. we have a wps for E309L but for fillet welds only. what will it take to qualify the CJP from SS 316 to A572 Grade 50???
Also Welder Qualification I am assuming a Person certified to stainless FCAW in that position can weld the Joint, but what about FCAW on mild steel???
If you are a regular, you know the next question. What welding code or standard is invoked by the project specifications or the customer? It does make a difference.
High strength low alloy steel welded to austentic stainless steel is considered to be disimilar metals, so whether you are welding to D1.1 or D1.6 really makes little difference. If the Engineer specifies D1.1 as the governing document, so be it.
The testing regiment consists of the following: visual volumetric NDT (RT would be the best choice in this case) guided bend tests (2-face, 2-root, or 4 side bends if the base metal is thick enough) reduced section tensile tests (2-each)
There is nothing too difficult in obtaining a sound weld and there are few if any problems with cracking provided E309 or E310 families are used for the filler metal. It appears you are using 309, so I wouldn't expect a problem passing the required tests.
Ok, i have figured out the WPS and PQR, and the welder that Qualifies the PQR gets qualified. What about the other guys in the shop that have D1.1 certs? Can they weld this joint in production??? or do they have to qualify to D1.6?
A5.22 filler metal qualification has nothing to do with this application. You are working to D1.1, so it governs. Since D1.1 utilizes F numbers, but only F1 through F4, the other F numbers (F5, F6, etc.) used by other welding standards, i.e., ASME Section IX or AWS B2.1 have no bearing on your situation.
There was a suggestion that you recommend D1.6 to the Engineer. It is more appropriate in this case because it gives you the latitude to qualify the welders using carbon steel base metal with the 309 or 310 filler metal. AWS D1.1 does not. I was going to suggest using AWS B2.1 as an alternate means of qualifying the procedures and the welders, but there is no provision to use carbon steel in lieu of stainless base metal in that standard.
If the Engineer insists you stay within the confines of D1.1, you have to provide him with a proposal of how you would like to approach this situation. He has to give you his blessing before you do much of anything.
Notice I used the term "Engineer" and not "engineer". There is a difference.
It gets complicated when someone tries to mix apples and oranges together.
David,
