[MW:23408] ASME Part II C- Difference between Lot and Batch Testing of welding conumables

Dear Experts

 Pls breakdown the difference and limitation of its applicability.

 I was told Lot No used in PQR Qualification need to be the same used for Production Welding.
 I mean it is neither essential or supplementary essential variable

Does Design/Construction Codes such as  ASME B31.3 or AWS D1.1/ AWS D1.16  have any restrictions?

Pls advise

Thanks

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