What is it called when a groove is prepared only part of the way through the joint? I weld fillet weld backing weld partial joint penetration (PIP)weld

## Step 1<br />The problem is asking for the term used when a groove is prepared only part of the way through the joint. This is a specific term used in welding and fabrication.<br /><br />## Step 2<br />The term for this is "partial joint penetration (PIP) weld". This term is used when the weld penetrates only a part of the joint, rather than the full depth of the joint.<br /><br />## Step 3<br />The other options provided, "I weld", "fillet weld", and "backing weld", are all different types of welds. However, they do not specifically refer to a situation where the weld penetrates only a part of the joint.