Say you have two pipes (as pictured below) that you want to weld together. SOLIDWORKS allows you to model a weld bead at the part or assembly level. In this case, we will add the weld bead in the assembly, by selecting Insert > Assembly Feature > Weld Bead.
You can set the options for the weld in the Weld Bead PropertyManager. In our case, if we select the closest edges of each pipe for the “Weld From” and “Weld To” fields, we get the result below.
As shown, the weld bead extends into the pipe interior.
If, instead, we select the inside faces (shown below) the weld bead does not extend into the pipe interior.
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