Final answer:
The field weld symbol is a supplementary symbol used in engineering to designate field welds, which are made on-site. It is indicated by a set of parallel lines placed across the reference line.
Step-by-step explanation:
The field weld symbol is a supplementary symbol indicated by a set of parallel lines placed across the reference line. It is used in engineering to designate field welds, which are welds that are made in the field or on-site rather than in a workshop or factory.
For example, in a welding drawing, the field weld symbol may be used to indicate that a particular weld is to be performed in the field rather than in a controlled environment. This symbol ensures that the welder knows where the weld needs to be made and provides additional information such as the number of field welds required.
Overall, the field weld symbol is a valuable tool in engineering drawings as it helps ensure clarity and consistency in communicating weld requirements for construction projects.