You should first load a robot and a spot welding gun as the robot tool.
You can use the following components from RoboDK online library:
1.Robot: Comau Smart5 NJ 130-2.6
2.Tool: OBARA Spot Welding Gun
The pedestal and fixture will be loaded using local files, and to create the floor, we will use the Shape Add-In. You can look at our Getting Started Guide and Shape Add-in Documentation for further details.