Explain the difference between milling and welding.

Lathes create cylindrical parts using outside and inside diameter cutting tools of varying sizes and shapes. The material spins on a chuck while a tool cuts away material. The tool is secured on the tool post or in the tail stock.
A milling machine spins the tool to cut material that is held stationary in a fixture or a vise. Milling machines use cylindrical cutting tools, such as end mills and drills, to remove material to make a finished part.

The main tool used on a lathe is an insert cutter, which uses a removable tip to cut and shape the outside of material spinning in the chuck jaws. This type of cutting tool is not used on a milling machine. The milling machine's most commonly used type of tool is the end mill, which is placed in the spindle and spins at various speeds depending on the type of material being cut. End mills can be used in lathes, but they are usually used only in the spindle of a milling machine.

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Sorry i have to go ask somone else