Which statement best describes PQ PJP in terms of penetration?

Which statement best describes PQ PJP in terms of penetration?

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

Answer: (A)

Partial joint penetration means the weld metal fuses into the joint but does not extend through the full thickness of the plates. PQ PJP describes exactly that: the depth of fusion is less than the joint thickness. This is why the correct statement is that the joint penetration is less than thickness. If the penetration were equal to the thickness, that would be full joint penetration. If it were greater than the thickness, you’d have overpenetration, which isn’t the standard PJP condition. If there were no penetration at all, there would be no joint fusion.

Partial joint penetration means the weld metal fuses into the joint but does not extend through the full thickness of the plates. PQ PJP describes exactly that: the depth of fusion is less than the joint thickness. This is why the correct statement is that the joint penetration is less than thickness.

If the penetration were equal to the thickness, that would be full joint penetration. If it were greater than the thickness, you’d have overpenetration, which isn’t the standard PJP condition. If there were no penetration at all, there would be no joint fusion.