using 65 ksi weld procedures to weld 36 ksi material

[Mous1747]

the customer is saying that he will weld A106 Gr B to A105 pipes
but he only have a qualified weld procedures for 52 ksi and 65 ksi
he is asking if he can do that? or need to change the material ?

 

[weldstan]

Yes he can per ASME IX unless impact test qualification is required.
Are the 52 ksi and 65 ksi materials actually API 5L X52 and X65?

 

[Mous1747]

my apologies, i think i was not very clear, let me try to clarify little better

the customer is welding my A105 Adapter (36 ksi) to his A106 Gr B pipe (35 ksi), he only have weld procedures for 52 ksi and 65 ksi, does that mean the SMYS of the filler material is 52 ksi or 65 ksi respectively?

i think he is concerned because API 1104, ASME B31.8 and 31.4 require that the filler material should match only the material of the higher strength, correct?

 

Your question indicates you have no experience with welding engineering, so I recommend you seek someone (in the realosphere) who does. More so because the materials you describe are normally used for pressure equipment, possible carrying hazardous material.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[DekDee]

I agree totally with ironic metallurgists comments.
If it is API 1104 you are working with you cannot weld 35 or 36 ksi yield strength materials with WPS's for 52 or 65 ksi materials - they are from different material groups.

 

[gtaw]

I'm confused.

Filler metals used for for carbon and high strength low alloy steels are generally classified based on the tensile strength of the "all weld metal" tensile test. Base metals on the other hand are often specified by the materials tensile strength.

In this case, the person writing the inquiry appears to be referring to the base metal's yield strength. He has not indicated what is the governing welding/fabrication standard. Are we suppose to read his mind and fill in the blanks? I just get so confused.

Best regards - Al