To produce iron Easter decor on a large scale for mass production, the process would likely involve the following steps:

1. Design development: Designers would create sketches and 3D models of the Easter decor and work with engineers to ensure that the designs are suitable for mass production. The designers would also determine the best production methods and materials for the designs.
2. Raw material preparation: The factory would purchase iron rods and other necessary raw materials in bulk from suppliers. The raw materials would be inspected for quality and then processed and prepared for production.
3. Cutting and shaping: The iron rods would be cut and shaped using specialized cutting and bending machines to create the desired shapes and sizes for the Easter decor. The machines used for this process would be designed to quickly and accurately cut and bend the rods in large quantities.
4. Welding and assembly: The pieces of the Easter decor would be welded and assembled together using specialized welding machines and assembly lines. The assembly lines would be designed to quickly and efficiently put together the various components of the Easter decor.
5. Finishing: The Easter decor would then be finished using sandblasting or other surface treatment methods to smooth out any rough edges and prepare the surfaces for painting. The decor would then be painted using automated painting machines or by hand.
6. Packaging and shipping: Once the Easter decor is completed, it would be packaged and shipped to retailers or distributors for sale. The packaging would be designed to protect the decor during shipping and to showcase the decor in stores.

Overall, mass production of iron Easter decor would involve a combination of automated and manual processes to quickly and efficiently produce large quantities of Easter decor that are consistent in quality and appearance.