How are fillet welds on both sides indicated on a welding symbol?

• A. double arrow lines show both sides.
• B. Two fillet symbols on the same reference line; size and pitch specify strength and location.
• C. One fillet symbol on each side; same reference line.
• D. Fillet symbol on one side only.

Answer: (B)

When fillet welds are needed on both sides of a joint, you show two fillet symbols on the same reference line. That layout communicates clearly that there are two welds at that location—one on each side of the joint. The size of the fillet symbol gives the leg length for the welds, and the pitch (spacing along the joint) indicates where the welds are located if there are multiple welds along the seam. If both welds are the same size, you use two identical symbols; if different sizes are required, you would use different sizes for each symbol. This approach is the standard way to indicate double-sided fillets, rather than placing a single symbol or using separate lines that could misrepresent where the welds are and on which sides.