HC hexa spotweld
LS-DYNA
Creates hexa element with plot elements projecting and connecting to the surrounding shell elements. This realization does not use the shell thickness to calculate the hexa offset, therefore the hexa will project and be touching the shell elements.
The dyna mat100 (hexa) exists in exactly the same configuration with a HC hexa spotweld.
Radioss
This realization creates various configurations of hexas for the body, and the hexas project and connect to the adjoining shell/solid elements by touching the shell/solid elements.