What is the purpose of a leader line?

• A. Points Directly To Something For The Purpose Of Adding Notes Or Dimensions
• B. Indicates The Direction Of Weld Travel
• C. Specifies Weld Size
• D. Serves As A Scale Reference

Answer: (A)

Leader lines link a note or dimension to the exact feature on the drawing. They start at the feature and extend to the text so it’s clear what the note or measurement applies to, keeping the page uncluttered while avoiding ambiguity about location. In welding drawings, you’ll see leader lines used to attach instructions, tolerances, or specifications to a specific weld, edge, hole, or surface. They aren’t about showing how the weld travels or about setting the weld size by themselves—the size and travel direction come from the weld symbol and related notes, not from the leader line alone. They also aren’t a substitute for scale references, which are indicated separately.