Which statement describes PQ PJP for a prequalified partial joint penetration groove weld?

Which statement describes PQ PJP for a prequalified partial joint penetration groove weld?

• A. Having a joint penetration greater than thickness of material
• B. Having a joint penetration less than thickness of material
• C. Having a joint penetration equal to the thickness
• D. Having no joint penetration

Answer: (B)

Partial joint penetration means the weld does not reach through the full thickness of the joined plates. For a prequalified PJP groove weld, the root fusion is intentionally limited so the weld penetrates less than the material thickness. That’s why the best description is that the joint penetration is less than the thickness of the material. This is different from full penetration, where the weld fuses from one side to the other, or from no penetration, which would not provide a proper weld. In the prequalified scenario, the geometry and welding parameters are accepted without individual testing because they consistently produce that partial depth of fusion.

Partial joint penetration means the weld does not reach through the full thickness of the joined plates. For a prequalified PJP groove weld, the root fusion is intentionally limited so the weld penetrates less than the material thickness. That’s why the best description is that the joint penetration is less than the thickness of the material. This is different from full penetration, where the weld fuses from one side to the other, or from no penetration, which would not provide a proper weld. In the prequalified scenario, the geometry and welding parameters are accepted without individual testing because they consistently produce that partial depth of fusion.