Automatic Weld Symbols
Note: You cannot create new weld bead components, but you can edit weld bead components created prior to SolidWorks 2011.
When you create a weld bead, a weld symbol is automatically attached to the weld bead component in the assembly.

To add more detailed specifications to the default weld symbol:
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In the assembly document or in a drawing document, right-click the symbol and select Properties, or double-click the symbol.
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Specify the dimensions, symbols, and other options that you want to include, and click OK.