The difference between PQR and WPS accordance with ASME IX?

Procedure specification record (PQR): is a record of variables recorded during the welding of the test coupon.
See QW-200.2:

  • Content of the PQR
  • Change to the PQR
  • Format of the PQR
  • Availability of the PQR
  • Muilple WPSs with one PQR or Multiple PQRs with one WPS

Welding procedure specification (WPS): is a written qualified welding procedure, development from PQR and applies all essential / supplementary / non-essential variables
See QW-200.1 & QW-401:

  • Content of the WPS
  • Change to the WPS
  • Format of the WPS
  • Availability of the WPS