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Can we use a multigrade steel A588/A709 gr. 50 for qualification of welder?
What welding code are you working with?
AASHTO/AWS D1.5. Bridge Welding Code
D1.5 has a few things to watch for when qualifying welders:
Clause 5.21.3 Base metal has to be an AASHTO approved steel as described in Clause 1.2.2 or the WPS(see Clause 126.96.36.199)
If the project has steel with 90ksi yield or greater, it makes you qualify on base metal meeting the same specification as the steel for the project.
A588/A709-50W is listed as M270 under AASHTO.
We use it extensively for our D1.5 welder qualifications as we work primarily on Weathering Steels.
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