What material is primarily used in MIG welding?

MIG welding, or Metal Inert Gas welding, primarily utilizes solid wire and flux-cored wire as the main materials for the welding process. Solid wire is the most common choice in MIG welding because it offers a clean and consistent weld. It feeds continuously through the welding gun, allowing for efficient and seamless welding operations.

On the other hand, flux-cored wire is also used in MIG welding, particularly when welding in outdoor conditions or for thicker materials. This type of wire contains a flux core that helps to create a shielding gas around the weld area, which protects it from contamination and improves the quality of the weld.

The combination of solid wire and flux-cored wire provides welders with versatility depending on the specific requirements of their projects, including the type of materials to be welded and the working environment. This is why solid wire and flux-cored wire together are the correct answer, as they are both integral to the MIG welding process.