When saving objects from weldment, you may encounter a message about this, that objects contain illegal names. Mainly it concerns the sign /, which occurs in operations Trim / Extend and less commonly used Move/Copy.

The general rule is this, that object names come from the last operation on the object. So you can also change the names directly in the operation tree. Names with prohibited signs can be changed when saving the objects – However, to everyone by hand.

I guess, that you will use the magic button Automatically assign names, who will do it for you!