What are the required elements of a welding symbol?

The correct answer highlights the essential components necessary for conveying welding instructions clearly. A welding symbol typically includes a reference line and an arrow, which serve as the foundational elements of the symbol.

The reference line is a horizontal line on which all the information related to the weld is depicted, allowing welders to interpret the welding requirements. The arrow points to the joint or area where the welding operation is to occur, indicating the specific location that needs attention. This combination is crucial as it forms the basis from which all other pieces of information about the weld can be understood.

While other options mention additional elements that may be part of more complex weld symbols, they do not present the fundamental components needed for a basic welding symbol. Therefore, it is vital to recognize that the reference line and arrow are the most critical elements in ensuring clear communication of welding instructions.