Complete joint penetration, where weld metal extends through the entire thickness of the joint, made from both sides with back gouging or from one side with backing or an open root. CJP welds develop the full strength of the base metal and are required on many moment connections, butt splices and pressure joints, often with UT or RT. PJP, partial joint penetration, deliberately fuses only part of the thickness.
Flange-to-column is CJP, back gouge to sound metal and it gets UT tomorrow.
Also heard as
- complete joint penetration
- full pen
- full penetration
Related terms
Groove weld
A weld made in a prepared opening between two members, such as a beveled butt joint.
UT
Ultrasonic testing: finding internal flaws by sending high-frequency sound into a weld and reading echoes.
Arc gouging
Removing metal with a carbon electrode arc and a jet of compressed air, used to back gouge and dig out defects.
Incomplete penetration
A root left unfused because the weld never reached all the way through a joint meant to be fully penetrated.