Unlist material in QW-422 (AISI 4130 ) weld to P No.1 Gr1

Date 11-11-2009 11:05

Hello

material unlist in QW-422 (AISI 4130 ) weld to P No.1 Gr1 ( A 333 Gr6 ) , we need to develop new WPS/PQR , for this dissimilar material can we select filler metal /electrode for P No.1 to weld this joint and possible to pass mechanical test ?

Thank you and Best Regards,
Dhanna

By jarcher (**)

Date 11-11-2009 18:24

Yes you need a WPS/PQR that supports the base materials you are going to weld, assuming you have a contract that specifies welding to whichever code. Yes the filler can match the mechanicals/chemistry of the P1 material, you're undermatched on the 4130, but the joint will never be any stronger mechanically than the P1 base metal anyway. It is quite possible to pass mechanical tests with this combination of materials, its done daily all over the oil patch. Remember that this will require preheat and PWSR in all likelyhood.