Weld size refers to the weld fullness at the welding position. Generally refers to the height and length of the weld, which can be measured with a welding ruler? What are the requirements for weld size symbols and marks? ? General requirements: Basic symbols can be accompanied by size symbols and data. The size symbols are:? Workpiece thickness (t); ? Oblique angle (α; Root space (b); ? ? Blunt edge (p; ? ? ? ? Weld width (c; ? ? Number of welding sections (n); ? ? Weld spacing (e); ? Size of fillet weld (k); ? Nugget diameter (d); ? ? Groove depth (h); ? Welding residual height (k); ? Effective weld thickness; ? ? Angle of groove surface (); Root radius (r), etc? ? Rules for marking weld size symbols and data:? ? ? 1. The dimensions on the weld cross section are marked on the left side of the bearing symbol; ? ? ? Figure 2. The weld length dimension is marked on the right side of the basic symbol? ? ? ? Figure 3. Indicate the dimensions of slope angle, slope angle and root gap on the upper and lower sides of the basic symbol. ? ? 4. The number of welding symbols at the tail is the same; ? ? ? 5. When the size data to be marked is too large to be recognized, the corresponding size symbol can be added before the data; ? ? ? Figure 6. When the direction of the arrow line changes, the above principle remains unchanged. ? Please refer to the following figure for specific identification regulations: