Final answer:
In welding symbols, a weld on the arrow side of a joint is indicated by placing the weld symbol below the reference line, signaling that the weld should be applied to the same side the arrow points to.
Step-by-step explanation:
In the context of welding symbols, indicating a weld on the arrow side of a joint involves using a reference line, an arrow line, and a tail with specific welding symbols. These symbols are part of a standardized system that communicates to welders the type of weld, size, length, and other pertinent information needed to complete the weld properly. The specific marking for a weld on the arrow side is denoted by placing the weld symbol below the reference line. This signifies that the welding is to be performed on the same side of the joint that the arrow points to. If the symbol is above the reference line, the weld is to be placed on the opposite side, sometimes referred to as the other side.