When using FCAW, requalification of a PQR/WPS is not required if there is a change in travel speed by what percentage?

In the context of FCAW (Flux-Cored Arc Welding), requalification of a Procedure Qualification Record (PQR) or Welding Procedure Specification (WPS) is typically required when there are significant changes to the welding procedure that could affect the quality of the weld. However, minor adjustments in certain parameters, such as travel speed, do not necessitate requalification if they fall within specific limits.

The correct percentage for travel speed changes, which allows for continued validity of the existing PQR/WPS without requiring requalification, is identified as 10%. This threshold is established in the AWS D1.1 code to ensure that weld integrity is maintained while also providing some flexibility in the application of the welding procedure.

If the change in travel speed exceeds this 10% threshold, it may alter the heat input, bead profile, and overall weld quality, which could compromise the integrity of the weld. Therefore, exceeding this limit would require a re-evaluation and requalification process to ensure compliance with safety and performance standards.

In essence, adhering to the 10% guideline helps welders and engineers manage their welding processes effectively while minimizing unnecessary administrative burden, ensuring that quality and safety remain paramount in structural welding practices.