Abaqus - Coupled thermal-electrical analysis

Hello everyone,

I would like to simulate a resistance welding process with Abaqus.
The simulation is not working as soon as I apply both current and force as load.
I have already gone through the material data and its corresponding units several times and have varied the increment sizes. Everything has unfortunately not led to the goal.

I really need help and would be very happy about some advices and experiences.

The link will lead you to my previous model design:

https://1drv.ms/u/s!Ah7jNJG37NBp1hnzH4hqxQ8a5vm7?e=rOiwMc