As you read, A5.20 and A5.29 were combined starting in 2015 if I remember correctly. There was a transition period of three years after which A5.20 and A5.29 would evaporate into the ether. However, codes being what they are, continue on until they are no longer referenced by engineers and owners. It could be 3, 6, or 26 years before project specifications mo longer reference A5.20 or A5.29.
I remember reading a project specification for a new structure several years ago that referenced a structural code first published in 1928, Code for Fusion Welding and Cutting in Building Construction that was replaced with AWS D1.0 in 1941. It also included a statement that all welds shall meet first class workmanship in accordance with AWS. Talk about simple copying a boiler plate from on specification to another.
The bottom line is new WPSs and PQRs developed in accordance with AWS D1.1:2020 should reference the current filler metal specifications, but that doesn't mean you won't see them referenced anymore. I say AWS D1.1:2020 in anticipation that it will not longer reference A5.20 or A5.29. That could be a long shot.
Al
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