When must a WPS be qualified with a PQR according to W47.1-09?

• A. Only after project completion.
• B. When a new welding procedure is developed or when a contract requires certification of procedure, or when process/material/position changes require requalification.
• C. Never.
• D. Only for changes in filler metal grade.

Answer: (B)

The key idea is that a Welding Procedure Specification must be proven by a Procedure Qualification Record whenever you introduce a new welding procedure or when changes that could affect weld quality occur, or when a contract requires procedure certification. The PQR is the documented record of test welds that demonstrates the procedure can produce sound welds under the specified conditions. So, you qualify the WPS with a PQR when you develop a new procedure, when there are process, material, or position changes that necessitate requalification, or when the contract requires it. This explains why the described scenario is correct: it covers both creating a new procedure and any changes that could impact weld quality, plus contractual requirements. The other options don’t fit because qualification isn’t tied to project completion, is not never, and is not limited to changes in filler metal grade alone.