What is a Partial penetration weld?

Partial penetration weld

A partial penetration weld, also known as an incomplete penetration weld, is a type of weld joint where the weld does not fully penetrate through the entire thickness of the joint.

Instead, the weld is made to a certain depth, leaving a portion of the joint unpenetrated. This means that the weld does not extend all the way through the joint, but only partially into it.

The depth of penetration in a Partial Penetration weld is denoted by “S”. The “S” is the deciding factor for strength calculation in a Partial penetration welding joint.

Below is an example f a Partial Joint Penetration weld or also known as PJP Weld.

Partial penetration welds are commonly used in situations where full penetration is not required or when it is not feasible due to design or material constraints. They are often used in non-critical structural applications or when welding thick materials.

The depth of the weld penetration is determined based on the specific requirements of the joint and the intended purpose of the weld.