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Workbench Spot welding

Workbench Spot welding

(OP)
Why my simulation results show that the heat is concentrated in the middle of the electrode? I use "Thermal-Electric"
The setup "contact" 1. Between the Two electrodes and Upper workpiece whole contact area set "Thermal Conductance Value:385 w/m^2*oC"
            2. Between the Upper workpiece and lower workpiece whole contact area set "Thermal Conductance Value:73 w/m^2*oC"


The setup "stead-State Thermal-Electric Conduction" 1.The current 1000A is set on the electrode and the Voltage 0V is set on another electrode.
2.Two electrode surface set "Film Coefficient:300 w/m^2*oC"
3.Between the Two electrodes and Upper workpiece whole contact area set "Film Coefficient:21 w/m^2*oC"
4.Between the Upper workpiece and lower workpiece whole contact area set "Film Coefficient:100 w/m^2*oC"
5.The The bottom of the lower workpiece set "Film Coefficient:100 w/m^2*oC"


I am beginners in workbench , I would like to simulate the current field and the thermal field of the spot welding .
Hope to be able to guide me.Thank you.




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