Welding is a joining process that produces coalescence of materials by heating them to the welding temperature, with or without the application of pressure or by pressure alone, and with or without the use of filler metal (by AWS A3.0 / ASME Sect. IX )
Test positions for Groove welds :
Plate positions : IG, 2G, 3G & 4G
Pipe positions : IG, 2G, 5G & 6G
Test positions for Fillet welds :
Plate positions : IF, 2F, 3F & 4F
Pipe positions : IF, 2F, 2FR, 4F & 5F
WELDING PROCEDURE QUALIFICATIONS
Welding Procedure Specification ( WPS )
Is a written qualified welding procedure prepared to provide direction to the welder or welding operator for making production welds to code requirements.
Essential, non essential & supplementary essential (if any) and reference supporting PQR
May be made in the nonessential variables, provided such changes are documented
Any format as long as all variables are included
Shall be available for reference & review by the Authorize Inspector at the fabrication site
Procedure Qualification Record ( PQR )
Is a record of variables recorded during the welding of the test coupon , its also contains the test results of the tested specimens.
Actual variables used (of each process) during the welding and shall be certified by manufacturer
Changes to the PQR (content – including date) is not permitted except editorial corrections or addenda
Any format as long as all variables, type & number of tests and test results are included
Shall be available for reference & review by the Authorize Inspector
Multiple WPSs with one PQR or Single WPS with multiple PQRs may be used
Manufacturer’s or Contractor’s Responsibility
1. Shall responsible for the WPS qualification by the welding of test coupon and testing the specimens also the recording of the welding data and test results in a PQR (as req’d by the code).
2. It is not permitted to have the welding of the test weldments performed by another organization.
3. The Manufacturer or contractor shall certify that he has qualified each WPS, performed the qualification test and documented it with necessary PQR