What is a Prequalified Welding Procedure?
AWS D1.1 Structural Welding Code Prequalified WPS
A prequalified welding procedure is one that can be constructed by the rules of the code without qualification testing.
AWS D1.1 Clause 5 contains the applicable requirements and variables which shall be included on the written WPS for Plate, and Clause 10 Part C adds to Clause 5 by providing additional requirements for Tubular Structures.
Use AWS D1.1 form J-2 to create the prequalified welding procedure.
What Belongs on a Prequalified Welding Procedure?
As described in D1.1 paragraph 5.1 and for the convenience of the WPS author, Annex K provides a checklist of subclauses to confirm all the necessary contents have been included on the prequalified WPS. In some cases the information in Annex K can be listed in the quality or welding program in lieu of being listed on each WPS.
The following sections of AWS D1.1 Clause 5 and Clause 10 summarize the primary requirements for prequalified welding procedures. Make sure to read the entirety of these Clauses to have the complete set of requirements for your application.
Plate : Prequalified WPS : D1.1 Clause 5
Be familiar with all the paragraphs contained in Parts A through H
Prequalified WPS Requirements : Table 5.1
Essential Variables for Prequalified WPS : Table 5.2
Properly identify Base Metal Group Numbers : Table 5.3
Preheat and Interpass Temperatures : Table 5.8
Prequalified Joint Details : Figure 5.1
Reference the checklist in Annex K to ensure completeness of the WPS for the scope of application
Pipe or Tubular Structures : Prequalified WPS : D1.1 Clause 10 Part B
Fillet Weld : D1.1 Paragraph 10.8
PJP Groove : D1.1 Paragraph 10.9
CJP Groove : D1.1 Paragraph 10.10