Welder Performance Qualification: Tests, Variables, and Range of Approval
What is being tested
Welder performance qualification tests the individual's ability to deposit sound weld metal, not the adequacy of a procedure. The test is performed to a qualified procedure or a standard test detail, and the resulting weld is examined, usually by visual and radiographic or bend testing. Candidates must keep the distinction clear: procedure qualification establishes that the method works; performance qualification establishes that the person can execute it.
Essential variables for personnel
The variables that define a welder's range of approval include process, position, joint type, backing or no backing, filler classification where relevant, and thickness or pipe diameter. Position is the most heavily examined: a welder qualified in the flat position has a narrow range; qualification in vertical-up or overhead extends coverage. Pipe diameter and thickness rules are often asymmetric, mirroring procedure qualification, and a welder qualified on thin material may not be qualified for thick material.
Continuity and renewal
Qualification is not permanent in the same sense as a PQR. Most codes require the welder to remain qualified through continued use of the process, with a defined maximum period of inactivity; exceeding that period typically requires requalification or a specified revalidation. Records must show the welder's identity, the variables tested, the test results, and the dates of validity. A common trap is assuming that a lapsed qualification can be restored simply by resuming work, or that a welder qualified by one employer is automatically qualified for another without the required confirmation.
Rule of thumb
Before assigning a welder, check three things: process and position coverage, thickness and diameter coverage, and current validity of the qualification record.
Worked example: a welder qualified on 6 mm plate in the flat position is assigned to a 12 mm vertical-up joint. Both the thickness and the position fall outside the qualified range, so the assignment is not permitted until the welder is requalified appropriately.