A CJP groove weld qualification on 1/2" thick plate qualifies a procedure for what range of thickness?

A complete joint penetration (CJP) groove weld qualification on 1/2" thick plate is intended to provide a clear understanding of how a welding procedure performs across a range of material thicknesses. When a welding procedure is qualified on a specific plate thickness, it typically allows for some variation in thickness in both directions.

In this particular case, qualification on a 1/2" thick plate generally permits welding on materials ranging from 1/8" thick up to 1" thick. This is due to the need for sufficient penetration and reinforcement to maintain weld integrity and strength in both thinner and thicker materials.

The qualification range encompasses thinner materials that can adequately fuse together while also accommodating slightly thicker materials without requiring a complete requalification of the welding procedure. This range provides flexibility for welding applications where different plate thicknesses may be used, making option B the correct choice.