Impact test for PQR Stainless steel to carbon steel welding

[ali119]

Hi every body
I have a question about preparing PQR for S.S. 316l to API 5l Gr B and S.S.321 to API 5L Gr B welding.
Does these PQR need to Impact test for accepting welding method?
please let me know according which standard or code I can discern that dissimilar material welding need to impact test or NOT.

Best regard

 

[metengr]

ali119;
Impact testing requirements are generally based on the code of construction requirements for the above. If the code is silent on impact test requirements, you do not need them. What is your specific application that would require impact testing?

 

[ali119]

Thank metengr
according to the ASME B31.3 and operating temperature I can discern that impact test is need for S.S.321 to S.S.321 and S.S.316L to S.S.316L welding but I can't discern for API 5L GrB to S.S. 316L and API 5L GrB to S.S.321 piping system because I don't know exact operating temperature and I don't have access to data base of design.

 

[metengr]

ali119;
If you are using ASME B31.3 as the code of construction, you will need to have the design condition for the location of the carbon steel to stainless steel dissimilar metal weld, and if this is a pressure boundary weld. If the piping system is stainless steel and the purpose of the carbon steel is for structural hanger attachments, the carbon steel would not be impact qualified, only the filler metal and stainless steel base material (per your OP).
You are going to need more design information regarding the above.

 

[ali119]

metengr;
If the weld is a fillet weld type that weld a support to a pressure pipe(that operating temperature of piping system is low and need to impact test)and PQR provided on a groove weld,do we need to impact test for accepting PQR?if answer is YES,please tell me according to which code.
Thank you.

 

[metengr]

For B31.3, you only need to qualify with impact testing only the pipe base material and fillet weld metal used to join the structural attachment (carbon steel) to the stainless steel pipe. Beyond this, the structural attachment material is not under the scope of B31.3. You need to investigate if brittle fracture is a concern using engineering analysis.

 

[albaweld]

if your design and operating temps do not go below temperatures in the tables of B31.3 then no impacts are required to qualify your PQR, however if you are using low temp carbon there may be more information required from your design department, honestly without your range of temps and design at hand it is near impossible to answer in one or two sentences.

 

[ali119]

Thank you metengr;
could you tell me in which part of B31.3 I can see your preamble. because I want to weld L.T.C.S as support to S.S.321 as pressure pipe.

 

[stanweld]

The low temp pipe support material is outside the B31.3 requirements for impact testing. What is the design/operating temp of the 321 pipe, noting that 321 is generally specified for high temp operation.

 

[drumsdw]

I agree with metengr. Impact requirements are driven by the code of construction. The design temp and material in construction all determine if the procedure needs to be impact tested.
Hope this helps