What is the required horizontal element linking all welding symbols?

• A. Reference line
• B. Arrow
• C. Tail
• D. Finish

Answer: (A)

Welding symbols are anchored by a horizontal reference line. This line runs across the drawing and serves as the baseline that links all the details of a weld—such as type, size, and any notes—so the information stays together for the correct joint. The arrow points to where the weld goes, and additional details can be placed above or below the reference line or carried by a tail, but the reference line is what ties everything to the same joint. The finish note and tail options provide supplementary information, not the linking baseline, so they aren’t the horizontal element that connects all welding symbols.