What do the welding symbols in a single-line diagram mean?
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What does FW mean? And what does it mean to put an X next to the small black dot in the welding symbol?
In a single-line diagram, welding symbols are used to indicate the ways and methods by which two or more circuits are connected. FW is one of the welding symbols, indicating a circuit connected by welding. Welding generally refers to a method in which two or more metal components are heated to their melting point using a heat source, and a strong connection is formed after cooling. In welding symbols, a small black dot marked with an X (·╳) indicates that the welding area needs to be protected from welding. This means that welding should not be performed at that location, probably because it is necessary to preserve or avoid affecting other parts. .
FW=Field Weld, a weld made on-site, as opposed to a weld prepared in a workshop.