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[FAQ]

Spot welds are rigid constraints. They are created between pairs of nodes. Creating a spot weld connection between three shells means that there will be two spot weld connection definitions for the three nodes – one of the nodes will belong to two spot welds at the same time. Spot welds are however rigid constraints and the system will become over-constrained if a node belongs to more than one spot weld. This is not allowed in Explicit Dynamics and Workbench LS-DYNA.
Workaround: replace the two spot welds by a remote point involving the three nodes. In case of n shell parts, use a remote point to replace the n-1 spot welds which comprises the n points. Please note that the connection through remote points will not be breakable in contrast to spot weld definitions.